BHIAG Bassell-Herman Direct Exhibits 1-6

June 1, 2021 By Electronic Filing Chief Operating Officer Iowa Utilities Board 1375 East Court Avenue Des Moines, IA 50319 Docket No.: TF- Re: Proposed Final Redline and Clean Tariff Changes

Dear Chief Operating Officer, Black Hills/Iowa Gas Utility Company, LLC d/b/a Black Hills Energy (“Black Hills”) submits the Proposed Final Redline and Clean versions of its Final Tariff as filed in Docket No. RPU-2021-0002 for review. Questions about this filing or requests for additional information should be directed to the undersigned at 515-343-2026 or to [email protected]. Respectfully submitted, /s/ Brooke Bassell-Herman

Brooke Bassell-Herman Principal Regulatory and Finance Analyst

Black Hills Energy 1205 SW 37th Street

Grimes, Iowa 50111 P: 515-343-2026

[email protected]

Filed with the Iowa Utilities Board on June 1, 2021, TF-2021-0045 (RPU-2021-0002)

mailto:[email protected]

mailto:[email protected]

Company Name:

Subject Matter:

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black Hills Energy

Consolidated Final Redline Tariff Changes


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black Hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Fifthourth Revised Sheet No. Index 9 Filed with the Iowa Utilities Board Replaces FourthThird Revised Sheet No. Index 9

TABLE OF CONTENTS NATURAL GAS SERVICE

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DATE OF ISSUE: JuneFebruary 128, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022June 1, 2019

ISSUED BY: Robert J. Amdor – Director, Regulatory & Finance

Sheet No.

RESERVED FOR FUTURE USE ........................................................................... 124

RIDERS AND INFORMATION SHEETS Purchased Gas Adjustment Uniform Clause ................................................ 125-127 Reserved for Future Use .............................................................................. 128-131 Annual Tax Refund ...................................................................................... 132 Rider No. 1 - Information Sheet ................................................................... 133 Rider No. 1E - TRS ...................................................................................... 134-135 Rider No. 1F - SV TRS ................................................................................ 136-137 Rider No. 1G - Incentive Rate ...................................................................... 138 Rider No. 1H - Environmental Protection Rate (EPR) .................................. 139-140 TT-1 Riders

Rider No. 1 ........................................................................................ 141-145 Rider No. 3 - Energy Efficiency Cost Recovery ........................................... 146 Rider No. 4 - System Safety Maintenance Adjustment ................................ 147 Rider No. 5 - Farm Tap Tracker Adjustment ................................................ 147.1 N Rider No. 6 – System Safety Integrity Adjustment…………………………….147.2 – 147.7 Rider No. 7 – High Efficiency Assistance Tool Adjustment…………………..147.8 – 147.10

TRANSPORTATION SERVICE Renewable Gas Transportation Service ...................................................... 148-150 General Service Transportation Service Held for Future Use ...................... 151 Small Volume Rates .................................................................................... 152 Large Volume Rates .................................................................................... 153 Balancing ..................................................................................................... 154-157 Service Terms & Conditions (All Transportation Classes) ........................... 158-161 Service Terms & Conditions (Small Volume Only) ....................................... 162-164 Service Terms & Conditions (Large Volume Only) ...................................... 165-166

SUMMARY OF CHARGES, DEPOSITS AND RATES ........................................... 167

Notwithstanding any other provision of this Iowa Utilities Board Gas Tariff, Seventh Revised Rate Schedule Tariff No. 1 or any contracts with customers referred to specifically or generally in Sheet Nos. 98 through 147, as revised, all rates and charges contained in this Tariff or the aforesaid contracts may be modified at any time by a subsequent filing made pursuant to the provisions of Chapter 476 of the Code of Iowa.

BHIAG Bassell-Herman Direct Exhibit 3 - Final Redline Tariff Page 1 of 39Filed with the Iowa Utilities Board on June 1, 2021, TF-2021-0045 (RPU-2021-0002)

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Second First Revised Sheet No. 98 Filed with the Iowa Utilities Board Replaces First Revised Original Sheet No. 98

RATE SCHEDULE GS-1, GENERAL SERVICE GAS

Availability Service under this rate schedule is available to any customer located in the towns as listed on Sheet No. 77.

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Availability, Applicability and Character of Service

This rate schedule shall apply to firm gas service for customers whose normal requirement does not exceed 199 Dekatherms on a peak day, and such service normally shall not be subject to curtailment or interruption, but will be subject to curtailment by pipeline supplier in compliance with their approved Federal Energy Regulatory Commission curtailment plan.

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Rate The customer’s monthly bill shall be the sum of the following components:

1. Basic Monthly Charge:A. Residential $19.5018.25 per meter B. Commercial & Industrial $38.0029.00 per meter

2. Non-Gas Cost: $0.148031635 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas

Adjustments Uniform Clause Information Sheet No. 133.4. Other: The rates above are subject to the following:

Energy Efficiency Cost Recovery Sheet No. 146 System Safety Maintenance Adjustment Sheet No. 147 Farm Tap Tracker Adjustment Sheet No. 147.1 System Safety Integrity Rider Sheet Nos. 147.2 – 147.7 Hight Efficiency Assistance Tool Sheet Nos. 147.8 – 147.10

Energy Efficiency Cost Recovery: The rates above are subject to Energy Efficiency Cost Recovery Information Sheet No. 146.

4. Safety Integrity Adjustment: The rates above are subject to SystemSafety Integrity Adjustment Sheet Nos. 147.

Farm Tap Tracker Adjustment: The rates above are subject to the Farm Tap Tracker Adjustment Sheet No. 147.1

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Basic Monthly Charge

The “customer charge” is a measure of the costs associated with the Company’s facilities that are not jointly used by other customers and other costs related directly to service to the individual customer. These costs are fixed and do not vary with the amount of gas the customer consumes.

Minimum Bill Residential - $19.5018.25 Commercial and Industrial - $38.0029.00

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Taxes The total bill is subject to state and local taxes.


Late Payment Charge

After 20 days there shall be a 1-1/2% charge on the unpaid balance.

Pressure Adjustment

The measured volume is subject to a pressure factor adjustment as listed on Sheets. 122-123.

Terms and Conditions

The General Terms and Conditions contained in this tariff shall apply to this rate schedule.

DATE OF ISSUE: JuneFebruary 128, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022June 1, 2019

ISSUED BY: Robert J. Amdor, Director Regulatory & Finance



RATE SCHEDULE SVJ-1, SMALL VOLUME JOINT SERVICE GAS

Availability All areas in Northern Natural Gas Company's Zone 1. T


This rate schedule shall apply to joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements that exceed 24 Dekatherms per day but are less than 200 Dekatherms per day, will be considered "Small Volume."

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1. Basic Monthly Charge: $9575.00 per meter 2. Contract Demand: $0.05010 per Therm 3. Non-Gas Cost: $0.061505237 per Therm 4. Purchase Gas Cost: The rates above are subject to Purchased Gas

Adjustments Uniform Clause Information Sheet No. 133.5. Other: The rates above are subject to the following:Energy Efficiency Cost Recovery Sheet No. 146 System Safety Maintenance Adjustment Sheet No. 147 Farm Tap Tracker Adjustment Sheet No. 147.1 System Safety Integrity Rider Sheet Nos. 147.2 – 147.7

Energy Efficiency Cost Recovery: The rates above are subject to Energy Efficiency Cost Recovery Information Sheet No. 146. 5. Safety Maintenance Adjustment: The rates above are subject to

Safety Maintenance Adjustment Sheet No. 147.Farm Tap Tracker Adjustment: The rates above are subject to the Farm Tap Tracker Adjustment Sheet No. 147.1

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Minimum Bill The minimum bill shall be the contract demand charge plus the basic monthly charge

Taxes The total bill is subject to state and local taxes. Late Payment Charge


Pressure Adjustment

The measured volume is subject to a pressure factor adjustment as listed on Sheet No. 123.

Penalty for Unauthorized Takes When Service is Interrupted:

Applicable rate above per Dekatherm plus the greater of either the pipeline daily delivery variance charges or $20.00 per Dekatherm, for gas used in excess of the volumes of gas to which customer is limited. Revenues for unauthorized takes will be credited to the Company’s PGA mechanism.


Affidavit Required

Customers electing interruptible service must sign an affidavit confirming the customer has an alternative fuel capability or is willing to discontinue gas service during periods of curtailment.



Billing Interval Customers served under this tariff sheet may be billed on more frequent than monthly intervals pursuant to Iowa Adm. Code 199-19.3(7).

DATE OF ISSUE: JuneFebruary 1,28, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022June 1, 2019




RATE SCHEDULE SVI-1, SMALL VOLUME INTERRUPTIBLE GAS


Applicability and Character of Service

This rate schedule shall apply to small volume gas service, which is subject to interruption at any time upon order of Company. Peak day gas requirements which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day will be considered "Small Volume."


1. Basic Monthly Charge: $9575.00 per meter 2. Non-Gas Cost: $0.061505237 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas


3. 4. Energy Efficiency Cost Recovery: The rates above are subject to

Energy Efficiency Cost Recovery Information Sheet No. 146.5. Safety Maintenance Adjustment: The rates above are subject to

Safety Maintenance Adjustment Sheet No. 147.Farm Tap Tracker Adjustment: The rates above are subject to theFarm Tap Tracker Adjustment Sheet No. 147.1.

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Minimum Bill The minimum bill shall be the basic monthly charge.


Late Payment Charge


Pressure Adjustment





Affidavit Required




DATE OF ISSUE: JuneFebruary 128, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022 June 1, 2019

ISSUED BY: Robert J. Amdor – Director Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute SecondFirst Revised Sheet No. 102 Filed with the Iowa Utilities Board Replaces First Revised Original Sheet No. 102

RATE SCHEDULE 221, MAINLINE SMALL VOLUME GAS SERVICE GAS

Availability All areas in Northern Natural Gas Company's Zone 1. T Availability, Applicability and Character of Service

This rate schedule shall apply to industrial customers served off the pipeline of the supplier taking joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements, which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day, will be considered "Small Volume."

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Safety Maintenance Adjustment Sheet No. 147.Farm Tap Tracker Adjustment: The rates above are subject to the Farm Tap Tracker Adjustment Sheet No. 147.1.

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Pressure Adjustment





Affidavit Required





DATE OF ISSUE: June February 128, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022June 1, 2019

ISSUED BY: Robert J. Amdor – Director Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute SecondFirst Revised Sheet No. 103 Filed with the Iowa Utilities Board Replaces First Revised Original Sheet No. 103

RATE SCHEDULE 429, MAINLINE SMALL VOLUME INTERRUPTIBLE GAS



This rate schedule shall apply to industrial customers served off the pipeline of the supplier taking small volume gas service which is subject to interruption at any time upon order of Company. Peak day gas requirements, which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day will be considered "Small Volume."

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1. Basic Monthly Charge: $9575.00 per 2. Non-Gas Cost: $0.00500 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas




Safety Maintenance Adjustment Sheet No. 147.Farm Tap Tracker Adjustment: The rates above are subject to the Farm Tap Tracker Adjustment Sheet No. 147.1.

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Late Payment Charge


Pressure Adjustment





Affidavit Required





DATE OF ISSUE: June 1February 28, 202119 PROPOSED EFFECTIVE DATE: April 1, 2022June 1, 2019 ISSUED BY: Robert J. Amdor – Director -– Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute First Revised Original Sheet No. 106 Filed with the Iowa Utilities Board Replaces Original Sheet No. 106

RATE SCHEDULE 491, LARGE VOLUME FIRM SERVICE GAS

Availability Service under this rate schedule is available to the following customers located near the indicated town: Massena, Iowa: Natural Gas Pipeline Company of America.


This rate schedule shall apply to firm gas service for use in customers' pumping station served off the pipeline of the supplier. The Massena station is not to exceed 700 Dekatherms per day. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”



Adjustments Uniform Clause Information Sheet No. 133.4. Other: The rates above are subject to the following:Energy Efficiency Cost Recovery Sheet No. 146 System Safety Maintenance Adjustment Sheet No. 147 System Safety Integrity Rider Sheet Nos. 147.2 – 147.7

3. Energy Efficiency Cost Recovery: The rates above are subject toEnergy Efficiency Cost Recovery Information Sheet No. 146.

Safety Maintenance Adjustment: The rates above are subject to Safety Maintenance Adjustment Sheet No. 147.

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Minimum Bill The minimum bill shall be the basic monthly charge. Taxes The total bill is subject to state and local taxes. Late Payment Charge


Pressure Adjustment

The measured volume is subject to a pressure factor adjustment as listed on Sheet No. 123




DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor, Director Regulatory & Finance



RATE SCHEDULE LVJ-1, LARGE VOLUME JOINT GAS SERVICE GAS

Availability All areas in Northern Natural Gas Company's Rate Zone 1. T


This rate schedule shall apply to joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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1. Basic Monthly Charge: $410200.00 per meter 2. Demand Charge – Customer’s MDQ times the Demand Charge Rate

of $0.05010 per Therm 3. Non-Gas Cost: $0.034642364 per Therm 4. Purchase Gas Cost: The rates above are subject to Purchased Gas




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Late Payment Charge


Pressure Adjustment








DATE OF ISSUE: August 24, 2015June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022September 24, 2015




RATE SCHEDULE LVI-1, LARGE VOLUME INTERRUPTIBLE SERVICE GAS



This rate schedule shall apply to large volume gas service, electrical generation customers. This service which is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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Late Payment Charge


Pressure Adjustment




Affidavit Required






DATE OF ISSUE: June 1August 24, 201521 PROPOSED EFFECTIVE DATE: April 1, 2022 September 24, 2015



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute First Revised OriginalSheet No. 109 Filed with the Iowa Utilities Board Replaces Original Sheet No. 109

RATE SCHEDULE LVI-2, LARGE VOLUME INTERRUPTIBLE – ELECTRIC GENERATION GAS



This rate schedule shall apply to electrical generation customers. This service is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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Late Payment Charge


Pressure Adjustment




Affidavit Required






DATE OF ISSUE: JuneAugust 124, 202115 PROPOSED EFFECTIVE DATE: April 1, 2022September 24, 2015




RATE SCHEDULE LVI-3, LARGE VOLUME INTERRUPTIBLE – GRAIN DRYER GAS

Availability All areas in Northern Natural Gas Company's Zone 1. T Availability, Applicability and Character of Service

This rate schedule shall apply to large volume gas service for commercial or industrial, having predominately seasonal needs, such as grain drying, the heating of anhydrous ammonia or other such uses. This service is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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1. Basic Monthly Charge: $1,230600.00 per meter per month for the 4 months, September through December.





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Late Payment Charge


Pressure Adjustment




Affidavit Required

Customers electing interruptible service must sign an affidavit confirming the customer has an alternative fuel capability or is willing to discontinue gas





DATE OF ISSUE: June 1August 24, 202115 PROPOSED EFFECTIVE DATE: April 1, 2022September 24, 2015




RATE SCHEDULE 518, MAINLINE LARGE VOLUME JOINT GAS SERVICE GAS

Availability All areas in Northern Natural Gas Company's Rate Zone 1. T


This rate schedule shall apply to industrial customers serviced off the pipeline of the supplier taking joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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1. Basic Monthly Charge: $410150.00 per meter 2. Contract Demand: Non-Gas cost $0.05010 per Therm

Sales Volumes: Non-Gas cost $0.00500 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas




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Minimum Bill The minimum bill shall be the contract demand charge plus the basic monthly charge.


Late Payment Charge








DATE OF ISSUE: June August 124, 202115 PROPOSED EFFECTIVE DATE: April 1, 2022September 24, 2015




RATE SCHEDULE 299 MAINLINE LARGE VOLUME INTERRUPTIBLE SERVICE GAS



This rate schedule shall apply to large volume gas service, which is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

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Energy Efficiency Cost Recovery Information Sheet No. 146.Safety Maintenance Adjustment: The rates above are subject toSafety Maintenance Adjustment Sheet No. 147.

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Late Payment Charge


Pressure Adjustment




Affidavit Required






DATE OF ISSUE: JuneAugust 124, 202115 PROPOSED EFFECTIVE DATE: April 1, 2022September 24, 2015



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Fourteenth Thirteenth Revised Sheet No. 141 Filed with the Iowa Utilities Board Replaces ThirteenthTwelfth Revised Sheet No. 141

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - GENERAL SERVICE AND RURAL

Tariff Rate Sheet No.

Commodity Gross

Margin [1] $/Therm

ECR 4 $/Therm

SSMA & FTTA Monthly Charge


Facility/ Transport

Charge Entitlement 98, 138 & 139 (GS-TP and Rural)

0.1480311635

Sheet 146

Sheet 147 & Sheet 147.1

$19.5018.25

$50.00 0.15116 I

98, 138 & 139 (Comm/Industrial)

0.1480311635

Sheet 146


$38.0029.00

$50.00 0.15116 I

[1] The ceiling transportation rate for all General Service and Rural rates is as indicated above.The floor transportation rate for each of these rate schedules is $0/Therm. The flex provision isoffered pursuant to Iowa Adm. Code Sec. 199—19.12(476).

DATE OF ISSUE: December 1, 2020June 1, 2021

PROPOSED EFFECTIVE DATE: April December 1, 20202022



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Sixteenth Fifteenth Revised Sheet No. 142 Filed with the Iowa Utilities Board Replaces Superseding Fifteenth Fourteenth Revised Sheet No. 142

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - SMALL VOLUME

Demand Charge

Tariff Rate

Sheet No.

Commodity Gross Margin

[1] ECR 4


Basic Monthl

y Charg

e

Facility/ Transport

Charge Margin [2] Entitlement

$/Therm $/Therm $ $ $ $/Therm $/Therm

100 (SVJ) 0.061505237 Sheet 146

Sheet 147

Sheet 147.1

9575.00

50.00 0.05010 0.73030 I

101 (SVI) 0.061505237 Sheet 146

Sheet 147

Sheet 147.1

9575.00

50.00I

[1] The ceiling transportation rate for all Small and Large Volume Joint rates is as indicated above. The floortransportation rate for each of these rate schedules is $0/Therm. The flex provision is offered pursuant to IowaAdm. Code Sec. 199—19.12(476).

[2] The ceiling contract demand margin for all Small and Large Volume Joint rates is as indicated above. Thefloor contract demand margin is $0/Therm. The flex provision is offered pursuant to Iowa Adm. Code Sec. 199—19.12(476).

DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director, Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute FifteenthFourteenth Revised Sheet No. 143 Filed with the Iowa Utilities Board Replaces Superseding Fourteenth Thirteenth Revised Sheet No. 143

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - LARGE VOLUME

Demand Charge Tariff Rate

Sheet No.


[1] ECR 4

SSMA Monthly Charge


Facility/ Transport



107 (LVJ) 0.034642364 Sheet 146

Sheet 147 410200.00 150.00 0.05010 0.73030 R I

109 (LVI) 0.034642364 Sheet 146

Sheet 147 410200.00 150.00 I

110 (LVI) [3]

0.034642364 Sheet 146

Sheet 147 1,230600.00

150.00 I

108 (LVI) 0.034642364 Sheet 146

Sheet 147 410200.00 150.00 I



[3] Charged for four months only, September through December.

DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Sixteenth Fifteenth Revised Sheet No. 144 Filed with the Iowa Utilities Board Replaces Superseding Fifteenth Fourteenth Revised

Sheet No. 144

SCHEDULE TT-1 RIDER NO. 1, MAINLINE – JOINT AND INTERRUPTIBLE


Sheet No.


[1] ECR 4



Facility/ Transport



102 (SVJ) 0.00500 Sheet 146

Sheet 147

Sheet 147.1

9575.00 50.00 0.05010 0.73030 R I

103 (SVI) 0.00500 Sheet 146

Sheet 147

Sheet 147.1

9575.00 50.00 I

111 (LVJ) 0.00500 Sheet 146

Sheet 147 410200.00

150.00 0.05010 0.73030 R I

112 (LVI) 0.00500 Sheet 146

Sheet 147 410200.00

150.00 I



DATE OF ISSUE: JuneApril 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 20221 ISSUED BY: Robert J. Amdor – Director, Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Original Sheet No. 147.2 Filed with the Iowa Utilities Board

RIDER NO. 6, SYSTEM SAFETY AND INTEGRITY RIDER (SSIR)

APPLICABILITY All customers are subject to this SSIR designed to collect Eligible System Safety and Integrity Costs, as defined herein. The System Safety and Integrity Rider Charge shall be subject to annual changes to be effective on January 1 of each year. The System Safety and Integrity Rider Charge to be applied to each Rate Schedule is set forth on the Rate Schedules and Other Charges Schedule of Rates, Sheet 78.

ANNUAL APPLICATION

A. Each proposed revision in the System Safety and Integrity RiderCharge shall be accomplished by filing an application by August 1 of each year to take effect on the following January 1 (the “Annual Application”). The Annual Application shall contain the following items:

i. Pertinent information and supporting data related to EligibleSystem Safety and Integrity Costs, including, at a minimum, Project description and scope, Project costs and projected in-service dates for the Projects budgeted to be completed in the upcoming calendar year.

ii. Details of the Project costs incurred during the previous calendaryear including an explanation of how the Project costs were managed and any deviations between budgeted and actual costs.

iii. The calculation of the SSIR True-Up Amount, if any.iv. The calculation of the Deferred SSIR Balance, if any.

B. The Board anticipates a collaborative process for review of theCompany’s annual SSIR Application. The IUB directs the Company, Officer of Consumer Advocate (“OCA”) and Board Staff to meet in advance of the August 1st annual filing to discuss the Company’s planned SSIR-eligible capital spending plan.




RIDER NO. 6, SYSTEM SAFETY AND INTEGRITY RIDER (SSIR) CONTINUED

ANNUAL APPLICATION AND QUARTERLY SURVEILLANCE FILINGS (Continued)

C. After the Company files the Annual Application, the OCA shallconduct an examination of the filing to confirm that the underlying actual and projected Eligible System Safety and Integrity Costs (“SSIR Revenue Requirement”) comply with the Board’s Order in RPU-2021-0002, to confirm proper calculation of the SSIR True-Up Amount and the Deferred SSIR Balance. The OCA shall prepare and file such report no later than sixty days after the Application is filed. No other revenue requirement or rate making issue shall be examined unless the consideration of such affects the determination of the validity of the System Safety and Integrity Rider Charge.

D. The Board shall hold a hearing on the Annual Application no laterthan seventy days after filing of the Application, at which time the OCA shall present its report to the Board. If the Board finds that the Annual Application complies with the requirements of this SSIR Tariff, the Board shall enter an order authorizing the Company to collect the proposed System Safety and Integrity Rider Charge, including any SSIR True-Up Amount and any Deferred SSIR Balance, effective on January 1 of the following year.

E. The Company shall make annual surveillance filings within sixtydays after the end of each calendar year. Such filings shall include calculations of the rate base separated into regular and SSIR components, the realized rates of return on the rate base components, along with supporting calculations. Additionally, the filing shall include an update regarding the status of the current calendar year’s SSIR Project costs, projected in-service dates, and the expected schedule over the remainder of the calendar year.

DEFINITIONS A. “Deferred SSIR Balance” shall be equal to the balance, positive ornegative, of SSIR revenues at the end of a particular calendar year less the Eligible System Safety and Integrity Costs as projected by the Company for that particular calendar year, appropriate interest calculated on any over- recovered balance at a rate equal to the then current rate of interest on pipeline refunds established by the Federal Energy Regulatory Commission.

B. “Eligible System Safety and Integrity Costs” shall mean (1) a return,at a percentage equal to the Company’s currently authorized weighted average cost of capital grossed up for taxes, on the


projected increase in the jurisdictional component of the month ending net plant in-service balances associated with the Projects for the particular calendar year in which the System Safety and Integrity Rider Charge shall be in effect, exclusive of all plant in-service included in the determination of the revenue requirements approved in the Company’s last general rate case; (2) the plant-related ownership costs associated with such incremental plant investment, including depreciation, accumulated deferred income taxes, and all taxes including income taxes.

DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director, Regulatory




DEFINITIONS (Continued)

No operations and maintenance expenses are included in eligible SSIR costs. The return and income taxes and plant related costs associated with improvements or upgrades to facilities, made at the discretion of the Company to extend service or for future growth that is not specifically required by a statute or regulation, shall be excluded from Eligible System Safety and Integrity Costs.

C. “System Safety and Integrity Projects” (“Projects”) shall mean one or moreof the following:

i. Projects to comply with Code of Federal Regulations Title 49(Transportation), Part 192 (Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards), Subpart O (Gas Transmission Pipeline Integrity Management), including Projects in accordance with the Company’s transmission integrity management program (“TIMP”) and Projects in accordance with State enforcement of Subpart O and the Company’s TIMP;

ii. Projects to comply with Code of Federal Regulations Title49(Transportation), Part 192 (Transportation of Natural and Other Gas by Pipeline: Minimum Federal Safety Standards), Subpart P (Gas Distribution Pipeline Integrity Management), including Projects in accordance with the Company’s distribution integrity management program (“DIMP”) and Projects in accordance with State enforcement of Subpart P and the Company’s DIMP;

iii. Projects to comply with final rules and regulations of the U.S.Department of Transportation’s Pipeline and Hazardous Materials Safety Administration that become effective on or after the filing date of the Application requesting approval of this SSIR; and

iv. Facility relocation projects with a per-Project total cost of $5,000 ormore, exclusive of all costs that have been, are being, or will be reimbursed otherwise, that are required due to construction or improvement of a highway, road, street, public way or other public work by or on behalf of the United States, the State of Iowa, a political subdivision of the State of Iowa or another entity having the power of eminent domain.






v. Generally, Projects eligible for recovery under the SSIR Tariffinclude:

i. Obsolete and Problematic Pipe Programii. Transmission Integrity Programiii. ARMR Programiv. Government Mandated Facility Relocations

The Company shall use three distinct risk models corresponding to the TIMP, DIMP and the At-Risk Meter Relocation (ARMR) Program. All three models shall use objective and external factors and provide scores that correlate to proactive analysis of system risk.






In addition to the risk models, the Company shall consider other criteria, such as the availability of internal and external crews; project management constraints; local economic development plans; customer inconvenience and impact; other specific regulatory requirements; threat assessment; corrosion control analysis; pipeline vintage; pipeline material; pipeline design and class location; pipeline configuration and segmentation; pipeline system constraints; pipeline replacement history; population density; pipeline maintenance and internal inspection history; pipeline piggability; existence and reliability of pipeline asset and testing records; pipeline leakage and other incident history; subject matter expert knowledge; Project timeframe; weather and climate constraints on the construction season; permitting constraints; probability of pipeline testing failures and dewatering constraints; service outage management; and pipeline source of supply and availability of alternate gas supply. As part of the analysis, the Company shall identify and describe the proposed SSIR Projects that are for high-risk gas infrastructure by providing its risk assessment for each such SSIR Project including, if applicable, the probability of failure, the consequences of failure for the SSIR Project and how the Company prioritized the SSIR Project for which it seeks recovery. D. SSIR True-Up Amount” shall be equal to the difference, positive or

negative, between the Eligible System Safety and Integrity Costs as projected for a particular calendar year and the actual Eligible System Safety and Integrity Costs incurred by the Company for that particular calendar year, plus monthly interest calculated on that difference at a rate equal to the then current rate of interest on pipeline refunds established by the Federal Energy Regulatory Commission.

SSIR ADJUSTMENT CALCULATION

A. The System Safety and Integrity Rider Charge shall be equal to theEligible System Safety and Integrity Costs, plus or minus the SSIR True-Up Amount, plus or minus the Deferred SSIR Balance, multiplied by the customer class allocation basis authorized by the Commission to determine the class cost of service in the Company’s most recent general rate case, divided by the applicable number of bills for the particular customer class, as follows:

(continued)



The following fixed monthly surcharge shall be applied to all customers from the effective date of this tariff until the Company’s next general rate case, or until this tariff is updated and approved by the Iowa Utilities Board:

Class Monthly Surcharge Residential $ 0.66 N Non-Residential General Service (Sales & Transport) Small Volume Large Volume

$ 2.85

$14.59 $163.28

N

N N



SSIR ADJUSTMENT CALCULATION (continued)

System Safety and Integrity Rider Charge = ((A ± B ± C) * D) / E Where:

A = Eligible System Safety and Integrity Costs B = SSIR True-Up Amount

C = Deferred SSIR Balance D = Customer class allocation basis authorized by the Commission

to determine the class cost of service in the Company’s most recent general rate case

E = Applicable number of bills for the particular customer class B. The calculated rate shall be a separate line item on customer bills.

SSIR ADJUSTMENT WITH CHANGES IN BASE RATES

Whenever the Company implements changes in base rates as a result of a final Commission order in a general rate case setting new rates based on approved revenue requirements, the Company shall simultaneously adjust the SSIR to remove all costs that have been included in base rates. The Company shall continue to make annual revisions to the SSIR Charge to reflect appropriate true- ups and adjustments to the calculations, consistent with the other provisions contained in the System Safety and Integrity Rider Tariff, for each year that the Company is allowed to collect the SSIR Charge. .




RIDER NO. 7, HIGH EFFICIENCY ASSITANCE TOOL ADJUSTMENT (HEAT)

DESCRIPTION The customer retention incentive program, called High Efficiency Assistance Tool (HEAT), enables the Company to offer 1) an incentive to Residential and Commercial Service Customers to assist with the costs associated with the purchase and installation of a new, natural gas burning space-heating or water heating appliances and 2) an incentive to residential multi-unit builders to assist with the cost of installation of natural gas piping from the meter to the natural gas appliances(s) as well as required venting for each natural gas appliance.

HEAT CHARGE HEAT Charge. A flat monthly HEAT Charge shall be added for all jurisdictional Residential and Commercial Service Customers on the effective date of the HEAT Charge.

Class Surcharge Residential $0.00 Non-Residential General Service (Sales) $0.00

DETERMINATION OF HEAT PROGRAM COSTS

Determination of HEAT program costs. A. Annual Report. On or before November 1, the Company will submit

a report to the Commission detailing HEAT activity and expenses for the 12-month period ending August 31. The resulting HEAT Charge, as determined below, will be assessed to Customers January 1 through December 31. This process will be repeated each year.

B. HEAT program expenses which are eligible for inclusion in thedetermination of the HEAT Charge include only the actual incentive amounts paid. Total HEAT Program Incentives shall not exceed $2,000,000 annually. HEAT Program Incentives will be provided on a first come, first served basis.

C. The report filed by November 1 will include the eligible expensesassociated with HEAT as well as the allocation of those expenses as described below. Additionally, the report will state the proposed HEAT Charge to be effective January 1 of the upcoming year.

D. The Company shall reconcile on an annual basis the eligibleprogram expenses related to HEAT program activity with the revenues collected through the HEAT Charge.





DETERMINATION OF HEAT CHARGE

Determination of HEAT Charge. A. HEAT Charges will be determined by dividing the number of

forecasted annual bills into the total of HEAT program costs. B. The HEAT Charges will be an itemized monthly component of the

Customer’s bill.

RESIDENTIAL MULTI-UNIT INCENTIVES

The residential multi-unit incentive is intended to defray the builder’s costs to install natural gas piping from the meter to the natural gas appliances(s), and required venting for each natural gas appliance.

The HEAT Program’s Residential Multi-Unit Incentive are subject to the following:

A. All projects must be preapproved by Company with a signedCompany Agreement with the developer prior to the project commencement. Projects may span multiple years, with initial Company approval applicable throughout the project term.

B. All Qualified Natural Gas Appliances must be verified, installed, andin service, with appropriate documentation provided to Company, prior to incentive payment. Approval multiple year projects will receive incentives for the appropriate installations in each program year.

C. Incentives are not retroactive.D. Incentives are provided per unit and Qualifying Natural Gas

Appliance: a. Per Unit

i. Incentives may be provided to assist with the cost ofinstallation of natural gas piping from the meter to the natural gas appliances(s) as well as required venting for each natural gas furnace or space-heating appliance.

ii. Each unit must, at a minimum, contain an installednatural gas furnace.

iii. Each unit must be individually metered.





RESIDENTIAL MULTI-UNIT INCENTIVES (continued)

a. Qualified Natural Gas Appliancesiv. Water Heaterv. Range or Cook Topvi. Fireplacevii. Gas Dryerviii. Outdoor Appliances and Heating Systems

E. The Company’s liability provision contained in this tariff apply to all projects,and Company makes no warranties or guarantees, either express or implied as to the quality, fitness, or purpose of the installation, operation, or use of the services and equipment provided through this HEAT program.

DISCOUNTING If and when the Company discounts service charges or rates in order to maintain or increase system load, the Account 191 Charge, P-802 Charge and the HEAT Charge shall be discounted, in that order, prior to the discounting of any other components of the base rates.



GENERAL SERVICE TRANSPORTATION SCHEDULE RESERVED FOR FUTURE USE RATES

AVAILABILITY Service under this rate schedule is available to any non-residential end-use customer who purchases gas supplies that can be transported on a firm and/or interruptible basis by Company. Service hereunder shall be offered on a non-discriminatory firm and/or interruptible basis contingent upon adequate system capacity.

N N N N N

APPLICABILITY This service shall apply to general service gas transportation service with an MDQ of 0-25 Dekatherm per day, which includes a level of firm and/or interruptible gas service. The interruptible gas is subject to interruption at any time upon order of Company. Daily consumption cannot exceed 25 Dekatherm per meter on any day. Terms and Conditions from Sheet Nos. 158 – 164 will apply.

N N N N N N

RATE Fixed Rate: Customer Charge - $50 per month per facility for transportation service, plus the applicable sales tariff basic monthly charge. “Facility” shall include all meters serving buildings under common ownership behind the same town border station (“TBS”).

Daily Firm Capacity Charge: If applicable, is at the rate set forth in customer's regular sales tariff schedule.

Commodity Charge: All volumes received by customer hereunder shall be charged a rate equal to the commodity gross margin component of Company’s rate then in effect under its sales rate schedule for such customer. Customer is also subject to the Annual Cost Adjustment (ACA), as set forth in TT-1, Rider No. 1, and all charges imposed by the pipeline supplier for transportation service. Additional costs will be assigned as they are authorized by the FERC or state commissions to be charged by Company’s pipeline suppliers for transportation services, including, but not limited to, unauthorized overrun charges, take or pay costs, TCR costs, and GRI costs. In addition, all volumes delivered from system supply gas shall be charged the rate set forth in the appropriate Company sales tariff schedule, including the applicable customer charge.

Taxes: The total bill is subject to state and local taxes.

N N N N N N N N N N N N N N N N N N N N N N

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Original First Revised Sheet No. 151 Filed with the Iowa Utilities Board Replaces Original Sheet No. 151



Company Name:

Subject Matter:

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black Hills Energy

Consolidated Final Clean Tariff Changes


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black Hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Fifth Revised Sheet No. Index 9 Filed with the Iowa Utilities Board Replaces Fourth Revised Sheet No. Index 9

TABLE OF CONTENTS NATURAL GAS SERVICE

N N

N


Sheet No.

RESERVED FOR FUTURE USE ........................................................................... 124

RIDERS AND INFORMATION SHEETSPurchased Gas Adjustment Uniform Clause ............................................... 125-127 Reserved for Future Use ............................................................................. 128-131 Annual Tax Refund ...................................................................................... 132 Rider No. 1 - Information Sheet ................................................................... 133 Rider No. 1E - TRS ...................................................................................... 134-135 Rider No. 1F - SV TRS ................................................................................ 136-137 Rider No. 1G - Incentive Rate ...................................................................... 138 Rider No. 1H - Environmental Protection Rate (EPR).................................. 139-140 TT-1 Riders

Rider No. 1 ........................................................................................ 141-145 Rider No. 3 - Energy Efficiency Cost Recovery ........................................... 146 Rider No. 4 - System Safety Maintenance Adjustment ................................ 147 Rider No. 5 - Farm Tap Tracker Adjustment ................................................ 147.1 Rider No. 6 – System Safety Integrity Adjustment…………………………….147.2 – 147.7 Rider No. 7 – High Efficiency Assistance Tool Adjustment…………………..147.8 – 147.10

TRANSPORTATION SERVICE Renewable Gas Transportation Service ...................................................... 148-150 General Service Transportation Service ..................................................... 151 Small Volume Rates .................................................................................... 152 Large Volume Rates .................................................................................... 153 Balancing ..................................................................................................... 154-157 Service Terms & Conditions (All Transportation Classes) ........................... 158-161 Service Terms & Conditions (Small Volume Only)....................................... 162-164 Service Terms & Conditions (Large Volume Only) ...................................... 165-166

SUMMARY OF CHARGES, DEPOSITS AND RATES ........................................... 167

Notwithstanding any other provision of this Iowa Utilities Board Gas Tariff, Seventh Revised Rate Schedule Tariff No. 1 or any contracts with customers referred to specifically or generally in Sheet Nos. 98 through 147, as revised, all rates and charges contained in this Tariff or the aforesaid contracts may be modified at any time by a subsequent filing made pursuant to the provisions of Chapter 476 of the Code of Iowa.

BHIAG Bassell-Herman Direct Exhibit 4 - Final Clean Page 1 of 27Filed with the Iowa Utilities Board on June 1, 2021, TF-2021-0045 (RPU-2021-0002)

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Second Revised Sheet No. 98 Filed with the Iowa Utilities Board Replaces First Revised Sheet No. 98

RATE SCHEDULE GS-1, GENERAL SERVICE GAS

T Availability, Applicability and Character of Service

This rate schedule shall apply to firm gas service for customers whose normal requirement does not exceed 199 Dekatherms on a peak day, and such service normally shall not be subject to curtailment or interruption, but will be subject to curtailment by pipeline supplier in compliance with their approved Federal Energy Regulatory Commission curtailment plan.

T


1. Basic Monthly Charge:A. Residential $19.50 per meter B. Commercial & Industrial $38.00 per meter


Adjustments Uniform Clause Information Sheet No. 133.4. Other: The rates above are subject to the following:

Energy Efficiency Cost Recovery Sheet No. 146 System Safety Maintenance Adjustment Sheet No. 147 Farm Tap Tracker Adjustment Sheet No. 147.1 System Safety Integrity Rider Sheet Nos. 147.2 – 147.7 Hight Efficiency Assistance Tool Sheet Nos. 147.8 – 147.10

I I I

T

T T

T N

N Basic Monthly Charge


Minimum Bill Residential - $19.50 Commercial and Industrial - $38.00

I I


Late Payment Charge


Pressure Adjustment

The measured volume is subject to a pressure factor adjustment as listed on Sheets. 122-123.






RATE SCHEDULE SVJ-1, SMALL VOLUME JOINT SERVICE GAS


This rate schedule shall apply to joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements that exceed 24 Dekatherms per day but are less than 200 Dekatherms per day, will be considered "Small Volume."

T




I

I

T T T

T

N






Pressure Adjustment




Affidavit Required








RATE SCHEDULE SVI-1, SMALL VOLUME INTERRUPTIBLE GAS



This rate schedule shall apply to small volume gas service, which is subject to interruption at any time upon order of Company. Peak day gas requirements which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day will be considered "Small Volume."




I I

T T

T T





Late Payment Charge


Pressure Adjustment




Affidavit Required




DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director Regulatory & Finance



RATE SCHEDULE 221, MAINLINE SMALL VOLUME GAS SERVICE GAS


This rate schedule shall apply to industrial customers served off the pipeline of the supplier taking joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements, which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day, will be considered "Small Volume."

T




I

T T

T T

N






Pressure Adjustment




Affidavit Required





DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director Regulatory & Finance



RATE SCHEDULE 429, MAINLINE SMALL VOLUME INTERRUPTIBLE GAS


This rate schedule shall apply to industrial customers served off the pipeline of the supplier taking small volume gas service which is subject to interruption at any time upon order of Company. Peak day gas requirements, which exceed 24 Dekatherms per day but are less than 200 Dekatherms per day will be considered "Small Volume."

T


1. Basic Monthly Charge: $95.00 per 2. Non-Gas Cost: $0.00500 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas


I

T T

T T





Late Payment Charge


Pressure Adjustment




Affidavit Required





DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director – Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute First Revised Sheet No. 106 Filed with the Iowa Utilities Board Replaces Original Sheet No. 106

RATE SCHEDULE 491, LARGE VOLUME FIRM SERVICE GAS

Availability Service under this rate schedule is available to the following customers located near the indicated town: Massena, Iowa: Natural Gas Pipeline Company of America.


This rate schedule shall apply to firm gas service for use in customers' pumping station served off the pipeline of the supplier. The Massena station is not to exceed 700 Dekatherms per day. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”




I I

T T

T N





Late Payment Charge


Pressure Adjustment








RATE SCHEDULE LVJ-1, LARGE VOLUME JOINT GAS SERVICE GAS


This rate schedule shall apply to joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

T


1. Basic Monthly Charge: $410.00 per meter 2. Demand Charge – Customer’s MDQ times the Demand Charge Rate

of $0.05010 per Therm 3. Non-Gas Cost: $0.03464 per Therm 4. Purchase Gas Cost: The rates above are subject to Purchased Gas


I

I

T

T T

N





Late Payment Charge


Pressure Adjustment










RATE SCHEDULE LVI-1, LARGE VOLUME INTERRUPTIBLE SERVICE GAS

T Availability, Applicability and Character of Service


T T




I I

T

T T N





Late Payment Charge


Pressure Adjustment




Affidavit Required








RATE SCHEDULE LVI-2, LARGE VOLUME INTERRUPTIBLE – ELECTRIC GENERATION GAS


This rate schedule shall apply to electrical generation customers. This service is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

T




I I

T

T T N





Late Payment Charge


Pressure Adjustment




Affidavit Required








RATE SCHEDULE LVI-3, LARGE VOLUME INTERRUPTIBLE – GRAIN DRYER GAS


This rate schedule shall apply to large volume gas service for commercial or industrial, having predominately seasonal needs, such as grain drying, the heating of anhydrous ammonia or other such uses. This service is subject to interruption at any time upon order of Company. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

T


1. Basic Monthly Charge: $1,230.00 per meter per month for the 4 months, September through December.



I

I

T T

T N





Late Payment Charge


Pressure Adjustment




Affidavit Required








RATE SCHEDULE 518, MAINLINE LARGE VOLUME JOINT GAS SERVICE GAS


This rate schedule shall apply to industrial customers serviced off the pipeline of the supplier taking joint gas service consisting of a base of firm gas volumes, supplemented by interruptible gas volumes. Company will calculate a peak day requirement for each premise by dividing the peak month usage in the last thirty six (36) months by 20. Peak day gas requirements of 200 Dekatherms or more will be considered “Large Volume.”

T


1. Basic Monthly Charge: $410.00 per meter 2. Contract Demand: Non-Gas cost $0.05010 per Therm

Sales Volumes: Non-Gas cost $0.00500 per Therm 3. Purchase Gas Cost: The rates above are subject to Purchased Gas


I

T T

T N



Minimum Bill The minimum bill shall be the contract demand charge plus the basic monthly charge.


Late Payment Charge










RATE SCHEDULE 299 MAINLINE LARGE VOLUME INTERRUPTIBLE SERVICE GAS



T




I T

T T

T N





Late Payment Charge


Pressure Adjustment




Affidavit Required





DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022ISSUED BY: Robert J. Amdor, Director Regulatory & Finance


Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Fourteenth Revised Sheet No. 141 Filed with the Iowa Utilities Board Replaces Thirteenth Revised Sheet No. 141

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - GENERAL SERVICE AND RURAL

Tariff Rate Sheet No.

Commodity Gross

Margin [1] $/Therm

ECR 4 $/Therm



Facility/ Transport

Charge Entitlement 98, 138 & 139 (GS-TP and Rural)

0.14803 Sheet 146


$19.50 $50.00 0.15116 I

98, 138 & 139 (Comm/Industrial)

0.14803 Sheet 146


$38.00 $50.00 0.15116 I

[1] The ceiling transportation rate for all General Service and Rural rates is as indicated above.The floor transportation rate for each of these rate schedules is $0/Therm. The flex provision isoffered pursuant to Iowa Adm. Code Sec. 199—19.12(476).



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Sixteenth Revised Sheet No. 142 Filed with the Iowa Utilities Board Replaces Fifteenth Revised Sheet No. 142

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - SMALL VOLUME

Demand Charge

Tariff Rate

Sheet No.


[1] ECR 4


Basic Monthl

y Charg

e

Facility/ Transport

Charge Margin [2] Entitlement $/Therm $/Therm $ $ $ $/Therm $/Therm

100 (SVJ) 0.06150 Sheet 146

Sheet 147

Sheet 147.1

95.00 50.00 0.05010 0.73030 I

101 (SVI) 0.06150 Sheet 146

Sheet 147

Sheet 147.1

95.00 50.00 I





Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Fifteenth Revised Sheet No. 143 Filed with the Iowa Utilities Board Replaces Fourteenth Revised Sheet No. 143

SCHEDULE TT-1 RIDER NO. 1, TOWN PLANT - LARGE VOLUME


Sheet No.


[1] ECR 4

SSMA Monthly Charge


Facility/ Transport


107 (LVJ) 0.03464 Sheet 146

Sheet 147 410.00 150.00 0.05010 0.73030 I

109 (LVI) 0.03464 Sheet 146

Sheet 147 410.00 150.00 I

110 (LVI) [3]

0.03464 Sheet 146

Sheet 147 1,230.00 150.00 I

108 (LVI) 0.03464 Sheet 146

Sheet 147 410.00 150.00 I



[3] Charged for four months only, September through December.



Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff Substitute Sixteenth Revised Sheet No. 144 Filed with the Iowa Utilities Board Replaces Fifteenth Revised Sheet No. 144

SCHEDULE TT-1 RIDER NO. 1, MAINLINE – JOINT AND INTERRUPTIBLE


Sheet No.


[1] ECR 4



Facility/ Transport


102 (SVJ) 0.00500 Sheet 146

Sheet 147

Sheet 147.1

95.00 50.00 0.05010 0.73030 I

103 (SVI) 0.00500 Sheet 146

Sheet 147

Sheet 147.1

95.00 50.00 I

111 (LVJ) 0.00500 Sheet 146

Sheet 147 410.00 150.00 0.05010 0.73030 I

112 (LVI) 0.00500 Sheet 146

Sheet 147 410.00 150.00 I







APPLICABILITY All customers are subject to this SSIR designed to collect Eligible System Safety and Integrity Costs, as defined herein. The System Safety and Integrity Rider Charge shall be subject to annual changes to be effective on January 1 of each year. The System Safety and Integrity Rider Charge to be applied to each Rate Schedule is set forth on the Rate Schedules and Other Charges Schedule of Rates, Sheet 78.

ANNUAL APPLICATION

A. Each proposed revision in the System Safety and Integrity RiderCharge shall be accomplished by filing an application by August 1of each year to take effect on the following January 1 (the “AnnualApplication”). The Annual Application shall contain the followingitems:

i. Pertinent information and supporting data related to EligibleSystem Safety and Integrity Costs, including, at a minimum,Project description and scope, Project costs and projected in-service dates for the Projects budgeted to be completed in theupcoming calendar year.

ii. Details of the Project costs incurred during the previouscalendar year including an explanation of how the Project costswere managed and any deviations between budgeted andactual costs.

iii. The calculation of the SSIR True-Up Amount, if any.iv. The calculation of the Deferred SSIR Balance, if any.

B. The Board anticipates a collaborative process for review of theCompany’s annual SSIR Application. The IUB directs theCompany, Officer of Consumer Advocate (“OCA”) and Board Staffto meet in advance of the August 1st annual filing to discuss theCompany’s planned SSIR-eligible capital spending plan.





ANNUAL APPLICATION AND QUARTERLY SURVEILLANCE FILINGS (Continued)

C. After the Company files the Annual Application, the OCA shall conductan examination of the filing to confirm that the underlying actual andprojected Eligible System Safety and Integrity Costs (“SSIR RevenueRequirement”) comply with the Board’s Order in RPU-2021-0002, toconfirm proper calculation of the SSIR True-Up Amount and theDeferred SSIR Balance. The OCA shall prepare and file such reportno later than sixty days after the Application is filed. No other revenuerequirement or rate making issue shall be examined unless theconsideration of such affects the determination of the validity of theSystem Safety and Integrity Rider Charge.

D. The Board shall hold a hearing on the Annual Application no later thanseventy days after filing of the Application, at which time the OCA shallpresent its report to the Board. If the Board finds that the AnnualApplication complies with the requirements of this SSIR Tariff, theBoard shall enter an order authorizing the Company to collect theproposed System Safety and Integrity Rider Charge, including anySSIR True-Up Amount and any Deferred SSIR Balance, effective onJanuary 1 of the following year.

E. The Company shall make annual surveillance filings within sixty daysafter the end of each calendar year. Such filings shall includecalculations of the rate base separated into regular and SSIRcomponents, the realized rates of return on the rate basecomponents, along with supporting calculations. Additionally, thefiling shall include an update regarding the status of the currentcalendar year’s SSIR Project costs, projected in-service dates, andthe expected schedule over the remainder of the calendar year.

DEFINITIONS A. “Deferred SSIR Balance” shall be equal to the balance, positive ornegative, of SSIR revenues at the end of a particular calendar yearless the Eligible System Safety and Integrity Costs as projected by theCompany for that particular calendar year, appropriate interestcalculated on any over- recovered balance at a rate equal to the thencurrent rate of interest on pipeline refunds established by the FederalEnergy Regulatory Commission.

B. “Eligible System Safety and Integrity Costs” shall mean (1) a return, ata percentage equal to the Company’s currently authorized weightedaverage cost of capital grossed up for taxes, on the projectedincrease in the jurisdictional component of the month ending netplant in-service balances associated with the Projects for theparticular calendar year in which the System Safety and Integrity RiderCharge shall be in effect, exclusive of all plant in-service included inthe determination of the revenue requirements approved in theCompany’s last general rate case; (2) the plant-related ownershipcosts associated with such incremental plant investment, includingdepreciation, accumulated deferred income taxes, and all taxesincluding income taxes.

DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor – Director, Regulatory





No operations and maintenance expenses are included in eligible SSIR costs. The return and income taxes and plant related costs associated with improvements or upgrades to facilities, made at the discretion of the Company to extend service or for future growth that is not specifically required by a statute or regulation, shall be excluded from Eligible System Safety and Integrity Costs.

C. “System Safety and Integrity Projects” (“Projects”) shall mean one ormore of the following:

i. Projects to comply with Code of Federal Regulations Title 49(Transportation), Part 192 (Transportation of Natural andOther Gas by Pipeline: Minimum Federal Safety Standards),Subpart O (Gas Transmission Pipeline IntegrityManagement), including Projects in accordance with theCompany’s transmission integrity management program(“TIMP”) and Projects in accordance with State enforcementof Subpart O and the Company’s TIMP;

ii. Projects to comply with Code of Federal Regulations Title49(Transportation), Part 192 (Transportation of Natural andOther Gas by Pipeline: Minimum Federal Safety Standards),Subpart P (Gas Distribution Pipeline Integrity Management),including Projects in accordance with the Company’sdistribution integrity management program (“DIMP”) andProjects in accordance with State enforcement of Subpart Pand the Company’s DIMP;

iii. Projects to comply with final rules and regulations of the U.S.Department of Transportation’s Pipeline and HazardousMaterials Safety Administration that become effective on orafter the filing date of the Application requesting approval ofthis SSIR; and

iv. Facility relocation projects with a per-Project total cost of$5,000 or more, exclusive of all costs that have been, arebeing, or will be reimbursed otherwise, that are required dueto construction or improvement of a highway, road, street,public way or other public work by or on behalf of the UnitedStates, the State of Iowa, a political subdivision of the Stateof Iowa or another entity having the power of eminent domain.






v. Generally, Projects eligible for recovery under the SSIR Tariffinclude:

i. Obsolete and Problematic Pipe Programii. Transmission Integrity Programiii. ARMR Programiv. Government Mandated Facility Relocations

The Company shall use three distinct risk models corresponding to the TIMP, DIMP and the At-Risk Meter Relocation (ARMR) Program. All three models shall use objective and external factors and provide scores that correlate to proactive analysis of system risk.






In addition to the risk models, the Company shall consider other criteria, such as the availability of internal and external crews; project management constraints; local economic development plans; customer inconvenience and impact; other specific regulatory requirements; threat assessment; corrosion control analysis; pipeline vintage; pipeline material; pipeline design and class location; pipeline configuration and segmentation; pipeline system constraints; pipeline replacement history; population density; pipeline maintenance and internal inspection history; pipeline piggability; existence and reliability of pipeline asset and testing records; pipeline leakage and other incident history; subject matter expert knowledge; Project timeframe; weather and climate constraints on the construction season; permitting constraints; probability of pipeline testing failures and dewatering constraints; service outage management; and pipeline source of supply and availability of alternate gas supply. As part of the analysis, the Company shall identify and describe the proposed SSIR Projects that are for high-risk gas infrastructure by providing its risk assessment for each such SSIR Project including, if applicable, the probability of failure, the consequences of failure for the SSIR Project and how the Company prioritized the SSIR Project for which it seeks recovery. D. SSIR True-Up Amount” shall be equal to the difference, positive or

negative, between the Eligible System Safety and Integrity Costsas projected for a particular calendar year and the actual EligibleSystem Safety and Integrity Costs incurred by the Company forthat particular calendar year, plus monthly interest calculated onthat difference at a rate equal to the then current rate of interest onpipeline refunds established by the Federal Energy RegulatoryCommission.

SSIR ADJUSTMENT CALCULATION

A. The System Safety and Integrity Rider Charge shall be equal tothe Eligible System Safety and Integrity Costs, plus or minus theSSIR True-Up Amount, plus or minus the Deferred SSIR Balance,multiplied by the customer class allocation basis authorized by theCommission to determine the class cost of service in theCompany’s most recent general rate case, divided by theapplicable number of bills for the particular customer class, asfollows:

(continued)





SSIR ADJUSTMENT CALCULATION (continued)

System Safety and Integrity Rider Charge = ((A ± B ± C) * D) / E Where:

A = Eligible System Safety and Integrity Costs B = SSIR True-Up Amount

C = Deferred SSIR Balance D = Customer class allocation basis authorized by the

Commission to determine the class cost of service in the Company’s most recent general rate case

E = Applicable number of bills for the particular customer class B. The calculated rate shall be a separate line item on customer bills.

SSIR ADJUSTMENT WITH CHANGES IN BASE RATES

Whenever the Company implements changes in base rates as a result of a final Commission order in a general rate case setting new rates based on approved revenue requirements, the Company shall simultaneously adjust the SSIR to remove all costs that have been included in base rates. The Company shall continue to make annual revisions to the SSIR Charge to reflect appropriate true- ups and adjustments to the calculations, consistent with the other provisions contained in the System Safety and Integrity Rider Tariff, for each year that the Company is allowed to collect the SSIR Charge.

The following fixed monthly surcharge shall be applied to all customers from the effective date of this tariff until the Company’s next general rate case, or until this tariff is updated and approved by the Iowa Utilities Board:

Class Monthly Surcharge Residential $ 0.66 N Non-Residential General Service (Sales & Transport) Small Volume Large Volume

$ 2.85

$14.59 $163.28

N

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DESCRIPTION The customer retention incentive program, called High Efficiency Assistance Tool (HEAT), enables the Company to offer 1) an incentive to Residential and Commercial Service Customers to assist with the costs associated with the purchase and installation of a new, natural gas burning space-heating or water heating appliances and 2) an incentive to residential multi-unit builders to assist with the cost of installation of natural gas piping from the meter to the natural gas appliances(s) as well as required venting for each natural gas appliance.

HEAT CHARGE HEAT Charge. A flat monthly HEAT Charge shall be added for all jurisdictional Residential and Commercial Service Customers on the effective date of the HEAT Charge.

Class Surcharge Residential $0.00 Non-Residential General Service (Sales) $0.00

DETERMINATION OF HEAT PROGRAM COSTS

Determination of HEAT program costs. A. Annual Report. On or before November 1, the Company will submit

a report to the Commission detailing HEAT activity and expensesfor the 12-month period ending August 31. The resulting HEATCharge, as determined below, will be assessed to CustomersJanuary 1 through December 31. This process will be repeatedeach year.

B. HEAT program expenses which are eligible for inclusion in thedetermination of the HEAT Charge include only the actual incentiveamounts paid. Total HEAT Program Incentives shall not exceed$2,000,000 annually. HEAT Program Incentives will be providedon a first come, first served basis.

C. The report filed by November 1 will include the eligible expensesassociated with HEAT as well as the allocation of those expensesas described below. Additionally, the report will state the proposedHEAT Charge to be effective January 1 of the upcoming year.

D. The Company shall reconcile on an annual basis the eligibleprogram expenses related to HEAT program activity with therevenues collected through the HEAT Charge.





DETERMINATION OF HEAT CHARGE

Determination of HEAT Charge. A. HEAT Charges will be determined by dividing the number of

forecasted annual bills into the total of HEAT program costs.B. The HEAT Charges will be an itemized monthly component of the

Customer’s bill.

RESIDENTIAL MULTI-UNIT INCENTIVES

The residential multi-unit incentive is intended to defray the builder’s costs to install natural gas piping from the meter to the natural gas appliances(s) and required venting for each natural gas appliance.

The HEAT Program’s Residential Multi-Unit Incentive are subject to the following:

A. All projects must be preapproved by Company with a signedCompany Agreement with the developer prior to the projectcommencement. Projects may span multiple years, with initialCompany approval applicable throughout the project term.

B. All Qualified Natural Gas Appliances must be verified, installed, andin service, with appropriate documentation provided to Company,prior to incentive payment. Approval multiple year projects willreceive incentives for the appropriate installations in each programyear.

C. Incentives are not retroactive.D. Incentives are provided per unit and Qualifying Natural Gas

Appliance:a. Per Unit

i. Incentives may be provided to assist with the cost ofinstallation of natural gas piping from the meter to thenatural gas appliances(s) as well as required venting foreach natural gas furnace or space-heating appliance.

ii. Each unit must, at a minimum, contain an installednatural gas furnace.

iii. Each unit must be individually metered.





RESIDENTIAL MULTI-UNIT INCENTIVES (continued)

a. Qualified Natural Gas Appliancesiv. Water Heaterv. Range or Cook Topvi. Fireplacevii. Gas Dryerviii. Outdoor Appliances and Heating Systems

E. The Company’s liability provision contained in this tariff apply to all projects,and Company makes no warranties or guarantees, either express orimplied as to the quality, fitness, or purpose of the installation, operation,or use of the services and equipment provided through this HEAT program.

DISCOUNTING If and when the Company discounts service charges or rates in order to maintain or increase system load, the Account 191 Charge, P-802 Charge and the HEAT Charge shall be discounted, in that order, prior to the discounting of any other components of the base rates.



GENERAL SERVICE TRANSPORTATION SCHEDULE RATES

AVAILABILITY Service under this rate schedule is available to any non-residential end-use customer who purchases gas supplies that can be transported on a firm and/or interruptible basis by Company. Service hereunder shall be offered on a non-discriminatory firm and/or interruptible basis contingent upon adequate system capacity.

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APPLICABILITY This service shall apply to general service gas transportation service with an MDQ of 0-25 Dekatherm per day, which includes a level of firm and/or interruptible gas service. The interruptible gas is subject to interruption at any time upon order of Company. Daily consumption cannot exceed 25 Dekatherm per meter on any day. Terms and Conditions from Sheet Nos. 158 – 164 will apply.

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RATE Fixed Rate: Customer Charge - $50 per month per facility for transportation service, plus the applicable sales tariff basic monthly charge. “Facility” shall include all meters serving buildings under common ownership behind the same town border station (“TBS”).

Daily Firm Capacity Charge: If applicable, is at the rate set forth in customer's regular sales tariff schedule.

Commodity Charge: All volumes received by customer hereunder shall be charged a rate equal to the commodity gross margin component of Company’s rate then in effect under its sales rate schedule for such customer. Customer is also subject to the Annual Cost Adjustment (ACA), as set forth in TT-1, Rider No. 1, and all charges imposed by the pipeline supplier for transportation service. Additional costs will be assigned as they are authorized by the FERC or state commissions to be charged by Company’s pipeline suppliers for transportation services, including, but not limited to, unauthorized overrun charges, take or pay costs, TCR costs, and GRI costs. In addition, all volumes delivered from system supply gas shall be charged the rate set forth in the appropriate Company sales tariff schedule, including the applicable customer charge.

Taxes: The total bill is subject to state and local taxes.

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DATE OF ISSUE: June 1, 2021 PROPOSED EFFECTIVE DATE: April 1, 2022 ISSUED BY: Robert J. Amdor

Black Hills/Iowa Gas Utility Company, LLC d/b/a Black hills Energy 7th Revised Tariff No. 1 Iowa Gas Tariff First Revised Sheet No. 151 Filed with the Iowa Utilities Board Replaces Original Sheet No. 151


Documents

BHIAG Bassell-Herman Direct Exhibits 1-6