Rescheduled Outages Project P215-01 NPRR 758 Improved ......Outage or Maintenance Outage schedule provided the new request meets the submittal requirements for Outage Scheduling. (2)

Rescheduled Outages

Project P215-01 NPRR 758

Improved Transparency for

Outages having a High

Economic Impact.

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Background

In 2015 and early 2016, the Outage Coordination

Improvement Task Force (OCITF) and ERCOT met to

discuss ways to:

• Identify Outages which have historically resulted in high

congestion costs

• Encourage earlier submission of these Outages

• Formalize a rescheduling process if these Outages must

be withdrawn or moved

• Provide improved transparency to Market Participants if

these Outages are submitted with 90 days or less notice.

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BackgroundThe approved result of the committees work became Project

P215-01 NPRR 758 Improved Transparency for Outages

having a High Economic Impact.

Specific items proposed within this NPRR include:

• Identification and posting of High Impact Outages (HIOs)

and associated High Impact Transmission Elements

(HITEs); and

• Introduction of a new “Rescheduled Outage” type.

Implementation of this NPRR will:

• Improve the market’s ability to hedge against congestion

• Encourage earlier submission of Outages

• Increase visibility of HIOs to Market Participants, and

• Allow more efficient and transparent rescheduling

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Definitions, Protocol and Process Revisions

ERCOT Definitions and Terminology to be discussed

includes:

• Transmission Elements

• High Impact Transmission Elements (HITEs)

• Major Transmission Elements (MTEs)

• Rescheduled High Impact Outages (HIOs)

• Transmission Element Examples

• Revisions to Protocol Section 3.1.5

• Outage Scheduler User Interface (OSUI) Revisions

• HIO MIS Reports

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Definitions

Transmission Element:

Part of a physical Transmission Facility that is:

• an Electrical Bus, line, transformer, generator, Load, breaker,

switch, capacitor, reactor, phase shifter, or other similar device

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High Impact Transmission Element (HITE)

A Transmission Element that may, in certain conditions, result in

High Congestion risk when taken out-of-service.

ERCOT, with input from Market Participants, shall annually

update the HITE list for approval by TAC

• Part of the ERCOT Transmission Grid

• Defined in the ERCOT Network Operations Model.

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Rescheduled High Impact Outage (RO)

An Outage on a High Impact Transmission Element (HITE) that was:

• Originally submitted and Approved as a Planned Transmission

Outage with greater than 90 days’ notice

• Being considered for rescheduling due to withdrawal of approval

by ERCOT of the original Planned Outage or subsequent

Rescheduled Outage(s).

NOTE: Only ERCOT shall be able to convert a Transmission

Planned High Impact Outage into a Rescheduled Outage after

discussion with the Requestor.

Definitions

High Impact Outage (HIO)

A Planned Outage or Rescheduled Outage that interrupts flow on

a High Impact Transmission Element (HITE).

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Major Transmission Elements (MTEs) and

High Impact Transmission Elements (HITEs)

The MTE & HITE List will be updated at least Annually with:

• Actual Outages associated with significant congestion1

during the previous years, including

• Multiple Outages

• Planned and Forced Outages

• Outages identified by Outage Coordination studies which

could have caused excessive generation re-dispatch under

certain conditions.

• Regardless of whether the outage actually occurred or not

• Additional elements as requested by Market Participants.1 Significant Congestion – incurred over $1 Million Dollars of Real-Time Congestion Rent during any given Month.

Congestion Rent $ is the difference in what is charged to Buyers and what is paid to Sellers when congestion occurs.

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Major Transmission Element (MTE) List

The Major Transmission Elements list is less detailed and is comprised

of:

• Line (LN), Transformer (XF), Bus, and Breaker/Switch that split the

bus.

• Congested Equipment Type (Lines, Transformers, Busses, Circuit

Breakers)

• Year and Month congestion occurred or was forecasted

• Contingencies and Resultant overloaded elements

• Whether based on Actual Congestion(RT) or Forecasted(ST)

• Whether based on Planned or Forced Outages

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High Impact Transmission Elements (HITE) List

The High Impact Transmission Elements list is more detailed

and is comprised of:

• All of the equipment associated with each MTE

• Station From/To Names

• Equipment Types (CB, LN, DSC) and Name

• Normal and Outage State (Open or Closed)

• Voltage (kV)

• TEID (Transmission Element ID) and RDFID (Resource Description

Framework ID)

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NPRR 758 Rescheduled Outages

High Impact

Transmission Element

Examples

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PUBLIC 11

A

100

L01

L02

L0

4

L40

C200

S123

CT0

2

C300 CT0

3

ST23

L44

L22

138kV

345kV

L50

L32

L42

L60

AT10 AT20

L32

L58

A

400

A

200A

300

A

800

A

900

A

500

A

700

A

600

B

300

B

350B

360

B

310B

320

B

370

D

400

D

500D

600D

700

D

300D

200

S

235

Transmission Elements

The HITE list

includes all of the

Transmission

Elements that

would be outaged

for High Impact

Outages on:

• Lines

• Transformers

• Buses

• Bkr/Switches

138kV

PUBLIC 12

A

100

L01

L02

L0

4

L40

C200

S123

CT0

2

C300 CT0

3

ST23

L44

L22

138kV

345kV

L50

L32

L42

L60

AT10 AT20

L32

L58

A

400

A

200A

300

A

800

A

900

A

500

A

700

A

600

B

300

B

350B

360

B

310B

320

B

370

D

400

D

500D

600D

700

D

300D

200

S

235

138kV


The HITE list

includes all of the

Transmission

Elements that

would be outaged

for High Impact

Outages on:

• Lines

• Transformers

• Buses

• Bkr/Switches

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A

100

L01

L02

L0

4

L40

C200

S123

CT0

2

C300 CT0

3

ST23

L44

L22

138kV

345kV

L50

L32

L42

L60

AT10 AT20

L32

L58

A

400

A

200A

300

A

800

A

900

A

500

A

700

A

600

B

300

B

350B

360

B

310B

320

B

370

D

400

D

500D

600D

700

D

300D

200

S

235

138kV


The HITE list

includes all of the

Transmission

Elements that

would be outaged

for High Impact

Outages on:

• Lines

• Transformers

• Buses

• Bkr/Switches

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A

100

L01

L02

L0

4

L40

C200

S123

CT0

2

C300 CT0

3

ST23

L44

L22

138kV

345kV

L50

L32

L42

L60

AT10 AT20

L32

L58

A

400

A

200A

300

A

800

A

900

A

500

A

700

A

600

B

300

B

350B

360

B

310B

320

B

370

D

400

D

500D

600D

700

D

300D

200

S

235

138kV


The HITE list

includes all of the

Transmission

Elements that

would be outaged

for High Impact

Outages on:

• Lines

• Transformers

• Buses

• Bkr/Switches

PUBLIC 15

A

100

L01

L02

L0

4

L40

C200

S123

CT0

2

C300 CT0

3

ST23

L44

L22

138kV

345kV

L50

L32

L42

L60

AT10 AT20

L32

L58

A

400

A

200A

300

A

800

A

900

A

500

A

700

A

600

B

300

B

350B

360

B

310B

320

B

370

D

400

D

500D

600D

700

D

300D

200

S

235

NOTE:

An Outage on any

individual

Transmission

Element included

in a HITE list will

also be in the

Outage Scheduler

Summaries and in

the HIO < 90 Day

Notice Report

138kV


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NPRR 758 Improved Transparency for Outages

having a High Economic Impact

Protocol

Revisions

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NPRR 758 & Protocol 3.1.5.7[NPRR758: Replace Section 3.1.5.7 above with the following upon system

implementation:]

3.1.5.7 Withdrawal of Approval of Approved Planned Outages, Maintenance Outages,

and Rescheduled Outages of Transmission Facilities

(1) If ERCOT believes it cannot meet the applicable reliability standards and has exercised

reasonable options, ERCOT may contact the TSP for more information prior to its withdrawal

of the approval for a Planned Outage, Maintenance Outage, or Rescheduled Outage. ERCOT

shall inform the affected TSP both orally and in written or electronic form as soon as ERCOT

identifies a situation that may lead to the withdrawal of ERCOT’s approval. If ERCOT

withdraws its approval, the TSP may submit a new request for approval of the Planned

Outage or Maintenance Outage schedule provided the new request meets the submittal

requirements for Outage Scheduling.

(2) In determining whether to withdraw approval, ERCOT shall duly consider whether the

Planned Outage, Maintenance Outage, or Rescheduled Outage affects public infrastructure if

ERCOT is made aware of such potential impacts by the TSP (e.g., impacts on highways,

ports, municipalities, and counties).

(3) Prior to withdrawing the approval of a High Impact Outage (HIO) submitted with greater

than 90-days’ notice, ERCOT shall coordinate with the TSP and may convert the Planned

Outage to a Rescheduled Outage. The Rescheduled Outage shall retain the same priority as

the original Planned Outage. ERCOT shall attempt to keep the Outage within the same

calendar month.

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NPRR 758 & Protocol 3.1.5.11

3.1.5.11 Evaluation of Transmission Facilities Planned Outage or Maintenance Outage Requests

(1) ERCOT shall evaluate requests, approve, or reject Transmission Facilities Planned Outages and

Maintenance Outages according to the requirements of this section. ERCOT may approve Outage

requests provided the Outage in combination with other proposed Outages does not cause a violation of

applicable reliability standards. ERCOT shall reject Outage requests that do not meet the submittal

timeline specified in Section 3.1.5.12, Submittal Timeline for Transmission Facility Outage Requests.

ERCOT shall consider the following factors in its evaluation:

(e) Previously approved Planned Outages and Maintenance Outages;

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NPRR 758 & Protocol 3.1.5.13

3.1.5.13 Transmission Report

(1) ERCOT shall post on the MIS Secure Area:

(d) At least annually, an updated list of High Impact Transmission Elements

(HITEs) pursuant to Section 3.1.8, High Impact Transmission Element

(HITE) Identification.

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High Impact Outages – Submitted 90 Days or Less

• A once-a-day Current Day Report (CDR) titled “High Impact

Outages – Submitted 90 Days or Less” will be posted to the

MIS Secure at Grid>Transmission shortly after midnight.

• Report will contain only the Accepted or Approved HIOs in

the Outage Scheduler at 0000 hours submitted 90 days or

less in advance of the Planned Start!

• For Group Outages, the Non-HIO transmission elements will

not be included in the report!

Report format is

consistent with the

Hourly Consolidated

Transmission

Outage Report.

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NPRR 758 Improved Transparency for Outages

having a High Economic Impact

Incorporating the

Rescheduled Outage

into the

Outage Scheduler

User Interface.

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Outage Scheduler User Interface (OSUI)

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To incorporate the new Rescheduled Outage type into the

existing Outage Scheduler User Interface (OSUI), the

following changes were made:

• On the Transmission Planned Outage request screens,

fields were added to alert the Requestor that:

o The selected transmission element

is on the High Impact Transmission

Element list (HIO with a “Y” flag)

o The High Impact Outage has been

requested greater than 90 days prior

to the Planned Start (HIO>90 Days

with a “Y” flag)

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For Rescheduled Outages, no “N”’s will be displayed. Blank

fields mean “No” and indicate that:

• HIO fields - Element was not on the HITE List

• HIO>90 Day fields - Outage was submitted 90 days or

less in advance of the Planned Start

NOTE: The no “N” convention for HIO

and HIO>90 Day fields is utilized on

applicable Outage Scheduler User Interface

screens and Outage Scheduler reports.

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Rescheduled Outage - Group Outage Rules:

• Elements may only be removed from a Rescheduled

Outage group, never added.

• If all of the HIO elements are removed from a

Rescheduled Outage group, the outage no longer

qualifies for Rescheduling.

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HIO and HIO>90 Day fields have been added to the following

OSUI screens:

• Outage Scheduler Summary

• Show/Hide Preference

• Planned Transmission Outage Request

• Selecting Equipment pull-downs

• Associated Equipment pull-downs

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Outage Scheduler Summary Screen

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Added HIO and HIO>90 columns on right edge of Summary

Screen

• “Y” in the HIO column indicates the outaged element is on

the HITE list

• “Y” in the HIO>90 column indicates that the outage was

submitted greater than 90 days prior to the Planned Start.

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Show/Hide Preferences

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HIO and HIO>90 columns may be hidden by de-selecting

them on the Show/Hide Preferences screen.

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Custom Filter

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Added Rescheduled Outage to the

Outage Type selection field

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Transmission Planned Outage Request Screen

29

Added indicators for:

• HIOs submitted greater than 90 days prior to

Planned Start (HIO>90 Days flag)

• Transmission Elements which are on the High

Impact Transmission Element list. (HIO flag)

Outage is

classified as a

High Impact

Outage if at least

one element is on

the HITE List

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Selecting Equipment Name Pull-Downs

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HIO column has been

added to the Selecting

Equipment pull-downs

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Associated Equipment Summaries

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High Impact Outage

fields have been added

to the Associated

Equipment Summaries

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Outage Scheduler Reports

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HIO and HIO>90 Day data will be added to the following:

• Outage Scheduler User Interface

o Outage History

o Print Summary

o .csv Summary

o .xml Summary

• MIS

o Consolidated Transmission Outage Report

o High Impact Outages – Submitted 90 Days or Less (New)

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The High Impact

Outage Process.

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NPRR 758 Rescheduled Outage Process

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HIO Process Overview – 90 days or less

HIOs submitted 90 days or less before the Planned Start:

• Accepted and Approved HIO Transmission outages are

posted daily to the MIS Secure.

• Are not eligible for Rescheduling.

• When ERCOT identifies that a HIO has been submitted with

90-days or less notice, ERCOT may coordinate with the

Requestor to make reasonable efforts to minimize any

detected impact.

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HIO Process Overview – greater than 90 days

HIOs submitted greater than 90 days prior to Planned Start

may be eligible for Rescheduling if ERCOT must consider for

Withdrawal.

a) ERCOT will discuss Rescheduling with Requestor.

b) If Requestor cannot Reschedule – ERCOT will Withdraw

c) If Requestor can Reschedule – ERCOT will convert into a

Rescheduled Outage.

d) Requestor must submit revised Planned Start and

Planned End dates and times (3 day minimum applies)

e) Requestor may remove Elements and modify fields after

Rescheduled Dates are submitted.

f) ERCOT will re-evaluate and, if no security violations exist,

issue Approval.

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When the Requestor can Reschedule the Transmission Outage:

• ERCOT will convert the Planned Outage into a Rescheduled Outage.

• Warning Message “Outage ABCD12345678 has been rescheduled, new

dates must be submitted” is issued

• Rescheduled Outage status will show as Rescheduled Outage -

Entered Not Yet Submitted (ENYS)

• Requestor must submit new Planned Start, Earliest Start, Planned End

and Latest End information (All four fields required).

o Three day minimum submittal applies

o Outage may start earlier or end later

o New outage duration cannot exceed the original duration.

• Requestor may edit the Name, Number and Notes fields

• Requestor may Cancel the request.

RO - Entered Not Yet Submitted status

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Editable Fields

ABC1234567

Single RO- Entered Not Yet Submitted status

Editable Fields

HIO Indicators

Original Request Date

Is Retained

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Editable Fields

ABC1234567

Group RO- Entered Not Yet Submitted status

Editable Fields

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While in ENYS status, ERCOT has the capability to

• Withdraw the Outage

• Revert the Rescheduled Outage – ENYS status back to a

Planned Outage– Approved status, after discussion with the

Requestor

RO - Entered Not Yet Submitted status

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While in Received at ERCOT status, Requestors may:

• Revise the Planned Start, Earliest Start, Planned End and

Latest End information.

o Three day minimum submittal applies

o Outage may start earlier or end later

o New outage duration cannot exceed the original

duration.

• Only remove elements from Group outages.

• Edit the Name, Number, Emergency Restoration, Nature of

Work and Notes fields

• Cancel the request.

RO - Received at ERCOT status

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May Only Remove from a Group

Editable Fields

RO - Received at ERCOT Status

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When the Requestor has completed it revisions while in

Received at ERCOT status, ERCOT shall evaluate the

Rescheduled Outage and either

• Approve the Rescheduled Outage or

• Reject the Request

RO - Received at ERCOT status

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When the Transmission Rescheduled Outage becomes

Approved, the normal rules and procedures for

Transmission Planned Outages apply.

RO – Approved Status

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While in Approved Status, ERCOT has the capability to

• Withdraw the Outage

• Revert the Rescheduled Outage – Approved status back to

a Rescheduled Outage– Entered Not Yet Submitted status,

after discussion with the Requestor

RO – Approved Status

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RO - Approved Status

May only remove from a Group

Editable Fields

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NPRR 758 - Rescheduled Outage Process

Questions?

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Documents

Rescheduled Outages Project P215-01 NPRR 758 Improved ......Outage or Maintenance Outage schedule provided the new request meets the submittal requirements for Outage Scheduling. (2)