MARCH 31, 2014

MARCH 31, 2014

Maine 2014 Outage Coordination

CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

Agenda• Welcome, Introductions and Safety

• Expectations and Goals for Meeting

• MPRP Project Update

• Other CMP/BHE Projects

• Specific Outage Discussion, Key Spring 2014/Fall 2014 outages

• Questions

CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE 2

Expectations/Goals

• Communicate significant planned 2014 Maine transmission equipment outages that could impact generation constraints

• Communicate specific outage coordination changes to limit impact on potential generation constraints

• Respond to outage coordination questions from the audience


MPRP Project Statistics

• 452 miles of new or rebuilt 345kV and 115kV Transmission• 183 miles of new 345kV Transmission• 105 miles of new 115kV Transmission• 5 miles of Rebuilt 345kV Transmission• 140 miles of rebuilt 115kV Transmission• 8 miles of rebuilt 34.5kV Sub Transmission• 11 miles of 345kV and 115kV line terminations

• 5 new Greenfield Substations• Albion, Coopers, Monmouth, Larrabee, Raven

• 6 Major Substation expansions• Maguire, South Gorham, Surowiec, Gulf Island, Belfast,

Livermore Falls

• 50 Remote end substation expansions or modifications

• 60 - Transmission line crossings


Northern Loop Construction

• Construction Status– Albion Road Substation energized– All 115kV lines terminated into Albion Road Substation– Construction of new 345kV line from Orrington to Albion Road complete– Various 115kV rebuilds complete

• Near term construction activities– Coopers Mills Road Substation energization– Rebuild various 115kV lines– Construction of one new 115kV line

• Future construction activities– Termination of 115kV and 345kV lines into Coopers Mills Road– Completion of one 345kV line– Completion of one 115kV line– Rebuild various 345kV lines

5CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

Central Loop Construction

• Construction Status– Larrabee Road Substation energized– Construction of new 345kV line from Larrabee Road to Surowiec– Gulf Island Substation energized– Various 115kV rebuilds

• Near term construction activities– Livermore Falls Substation energization – Construction of two new 115kV lines and rebuild one 115kV line.– Construction of one new 345kV line and rebuild of two 345kV lines.

• Future construction activities– Completion of 115kV rebuilds– Completion of one new 345kV line and rebuild of two 345kV lines.


Southern Loop• Construction Status

– Raven Farm Substation energized– Construction of new 345kV line between Raven Farm and Surowiec

complete– Surowiec 345kV expansion energized– Various 115kV rebuilds

• Near term construction activities– Eliot Substation final energization– Maguire Road Substation energization– Construction of new 345kV line between Maguire Road and Eliot– Various 115kV rebuilds

• Future construction activities– None


CMP/Emera Maine Capital and Maintenance Work

• Other Non-MPRP CMP Capital and Maintenance Work that affects the transmission system– Transmission Line Structure Replacements both Capital and

Maintenance– System Planning related Substation rebuilds or expansions to support

future reliability needs– Substation equipment replacements or upgrades to address

maintenance concerns– Transmission Line re-rates or rebuilds to increase capacity– Substation maintenance equipment inspections and relay testing– Regulatory required relay and equipment trip checks


Maine 2014 Transmission Outages

• Changes to plan typically result in increased construction cost– Costs include overtime, additional contractor resources, expedited

material, additional engineering and outage coordination resources, environmental mitigation, schedule and remobilization costs, permitting, etc.

• Outages that have the potential for significant impact to generators in 2014 will be discussed– Long (greater than one week) duration outages – Significant potential generation constraints


CMP Outage Applications

• Central Maine Power had 1,400 outage applications in 2013

• There have been 517 transmission (>34.5kV) and 185 sub-transmission (34.5kV) outage applications in 2014

• The MPRP Project has submitted 975 outage applications for the project through March 19, 2014

• The outages range in duration from a few hours to eleven months in length

• The MPRP team anticipates that there will be an additional 300 – 400 outages needed to finish the program


TRANSMISSION SYSTEM LIMITATIONSAll facility in and single facility out conditions

CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

Transmission System Limits Impact On Generation Constraints• Two categories of transmission system interface limits

• Wide Area – 13 Interfaces– Typically Include 345 kV and 115 kV facilities

• New Brunswick to New England Interface• New England to New Brunswick Interface• New England to New Brunswick + Keene Road Export Interface• Orrington South Interface• Orrington North Interface• Orrington Import Interface• Maine Yankee South Interface• Surowiec South Interface• Maine to New Hampshire Interface• New Hampshire to Maine Interface• Seabrook South Interface• Northern New England Scobie & 394 Interface• North to South Interface

– All lines in limits typically range from ~1000 MW to ~4000 MW– Single Line Out Limits typically reduce limits by ~500 MW to 800 MW


Transmission System Limits Impact On Generation Constraints

• Local Area - 7 Interfaces– Typically include 115 kV facilities

• Keene Road Export Interface• Bangor Hydro Export Interface• Keene Road + Bangor Hydro Export Interface• Wyman Hydro Export Interface• Inner Rumford Export Interface• Outer Rumford Export Interface• Western Maine Export Interface

– All lines in limits typically range from ~150 MW to ~500 MW– Single Line Out Limits typically reduce limits by ~50 MW to 100 MW– Most significant recent generations constraints have been from local

area constraints


2013-14 Maine Major Outages - Update

• 115 kV Outage Condition B Western Maine – 3rd Qtr 2013 – 4th Qtr 2013 ~ 3 month duration (Completed)– Moved from 1st Qtr 2014 to 2nd Qtr 2014 ~ 2 week duration

• 115 kV Outage Condition C Western Maine – 3rd Qtr 2013 ~ 3 week duration (Completed)

• 345/115 kV Outage Condition F Northern Maine Area– 4th Qtr 2013 ~ 1 week (Completed)

• 345 kV Outage Condition G Northern Maine Area– 3rd Qtr 2013 ~ 1 week (Completed)

• 345 kV Outage Condition H Northern Maine Area– 4th Qtr 2013 ~ 2 weeks (Completed)


2013-14 Maine Major Outages – Update (cont.)

• 345 kV Outage Condition I Northern Maine Area– 3rd and 4th Qtr 2013 ~ 4.5 weeks (Completed)

• 345/115 kV Outages Condition J Southern Maine Area– 3rd Qtr 2013 – 4th Qtr 2013 ~ 2.5 months (Completed)

• 115 kV Outages Condition K Central Maine Area– Multiple outages– 4th Qtr 2013 ~ 3 weeks (Completed)– 1st Qtr 2014 ~2.5 months (Completed)– 2nd Qtr 2014 ~ 3 weeks (Completed)

• 345 kV Outage Condition L Northern Maine Area– 1st and 2nd Qtr 2014 ~ 7 weeks



• 115 kV Outage Condition M Western Maine– 2nd Qtr 2014 ~ 1 week

• 345 kV and 115 kV Outage Condition N Central Maine– 2nd Qtr 2014 ~ 1 week

• 345 kV Outage Condition O Northern Maine– 1st outage 3rd Qtr 2014 ~ 1 week– 2nd outage 4th Qtr 2014 ~ 2 weeks– 3rd outage 1st Qtr 2015 ~ 1 week

• 345 kV Outage Condition P Southern Maine– 3rd Qtr 2014 ~ 1 week

• 345 kV Outage Condition Q Southern Maine– 4th Qtr 2014 ~ 4 weeks

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• 345 kV Outage Condition R Southern Maine– 1st Outage 3rd Qtr 2014 ~ 2 weeks– 2nd Outage 4th Qtr 2014 ~ 2 weeks

• 115 kV Outage Condition S Central Maine– 4th Qtr 2014 ~ 2 months

• 345 kV Outage Condition T Central Maine– 1st Qtr 2015 ~ 2 weeks

17

115 kV Outage Condition B Western Maine – Original Plan – 2nd Outage

• 115 kV Outage Condition B Western Maine originally planned to go on outage concurrent with Outage K in 1st Qtr 2014– Duration ~ 2 weeks– Some generators have DNE Limits– Removes 2 paths from Wyman Hydro Export Interface – Interface limits

• Inner Rumford Export Interface 85 MW – 215 MW• Outer Rumford Export Interface 85 MW – 275 MW • Wyman Hydro Export Interface 75 MW - 100 MW


115 kV Outage Condition B Western Maine – Original Plan – 2nd Outage

– Moved Outages so they do not occur at same time to reduce generation impacts

– Moved another serial outage, that has similar limits, to occur at the same time to reduce generation impacts• Reduced duration of restrictions by 4 days

– Interface limits• Inner Rumford Export Interface 85 MW – 215 MW• Outer Rumford Export Interface 85 MW – 275 MW • Wyman Hydro Export Interface 200 MW – 240 MW

• Last long duration MPRP outage in the Western Maine area– The Rumford SPS will be removed from service after this outage


345 kV Outage Condition L Central Maine

• 1st and 2nd Qtr 2014 ~ 7 weeks– Interface Limits

• New Brunswick – New England - 700 MW• Orrington South – 700 MW – 1200 MW• Maine-New Hampshire – 1300 MW – 1600 MW


115 kV Outage Condition M Western Maine

• 2nd Qtr 2014 ~ 9 days– Currently evaluating options to reduce duration – Interface Limits

• Wyman Hydro Export 240 MW

21

345 kV and 115 kV Outage Condition N Central Maine

• 2nd Qtr 2014 ~ 1 week– Multiple facility out condition required to complete work – Moved original schedule from mid 2nd Qtr to end of 2nd Qtr to minimize

impact to generators– Interface Limits

• Wyman Hydro Export 200 MW – 250 MW

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345 kV Outage Condition O Northern Maine

• Most difficult outage to coordinate in New England– Historically Requires:

• Many contingencies result in controlled islanding of the Maritimes• Must run specific generators• Do not exceed limits on specific generators• Minimum New Brunswick-New England Interface transfers• Maximum Orrington South Interface transfers• Results in almost all generators inside the Bangor Hydro + Keene Road

Export Interface cannot operate• Interface Limits

– New Brunswick-New England Interface MINIMUM 200 MW – 300 MW– Orrington South Interface limit 200 MW – 300 MW

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345 kV Outage Condition O Northern Maine

• Potential options to be assessed due to partial MPRP completions:

• Will assess a completely different approach to the outage to determine if it is more reliable, increases transfer capabilities, reduces impacts on generators ability to operate

• 1st outage 3rd Qtr 2014 ~ 1 week

• 2nd outage 4th Qtr 2014 ~ 2 weeks

• 3rd outage 1st Qtr 2015 ~ 1 week– This outage has been repositioned to occur after additional key MPRP

facilities are completed that will increase limits

24

345 kV Outage Condition P Southern Maine

• 3rd Qtr 2014 ~ 1 week– Interface Limits

• Surowiec South Interface Limits 450 MW – 500 MW• Moved to overlap 1st Outage O because of Orrington South Interface

Limits

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345 kV Outage Condition Q Southern Maine

• 4th Qtr 2014 ~ 4 weeks– Interface Limits

• Surowiec South Interface Limits 450 MW – 500 MW• May be able to be moved to overlap 2nd Outage O to because of Orrington

South Interface Limits– Timing is driven by environmental considerations

26

345 kV Outage Condition R Southern Maine

• 1st Outage 3rd Qtr 2014 ~ 2 weeks, 2nd Outage 4th Qtr 2014 ~ 2 weeks– Original plan for both outages

• Interface Limits– Maine-New Hampshire Interface Limits 200 MW – 300 MW

– Outages moved significantly until key MPRP facilities are completed.• Interface Limits

– Maine-New Hampshire Interface Limits 1000 MW – 1700 MW

27

115 kV Outage Condition S Central Maine

• 4th Qtr 2014 ~ 2 months– Interface Limits

• Wyman Hydro Export Interface Limits 50 MW – 75 MW

– Substantial impact to generators for a long duration• Evaluating a number of construction options to mitigate this exposure• Will update for Fall 2014 meeting

28

345 kV Outage Condition T Central Maine

• 1st Qtr 2015 ~ 2 weeks– Original plan

• Interface Limits– Orrington South Interface limit ~ 500 MW

– This outage has been repositioned to occur after additional key MPRP facilities are completed that will increase limits

– Interface Limits• Orrington South Interface limit TBD

– Will update for Fall 2014 meeting

29


REFERENCESMPRP Geographic Overview

Significant Maine Interfaces

MPRP Geographic Overview


Wyman Hydro Export Interface

• Wyman Hydro Export– All lines in-service limits do

not currently exist– Single facility out limits exist

• Based upon two 115 kV lines remaining after limiting contingency

– Limits due to stability performance (damping)• 200 MW – 290 MW

– Behind the constraint . . . • ~ 360 MW of generation• ~ 215 MW more proposed


Inner Rumford Export Interface

• Inner Rumford Export– All lines in-service limits do

not currently exist– Single facility out limits exist

• Limit based upon one 115 kV line remaining after limiting contingency

– Limits due to stability performance (damping, unit stability and post-fault voltage recovery)• 75 MW – 215 MW

– Behind the constraint . . . • ~460 MW of generation• ~ 255 MW more proposed


Outer Rumford Export Interface

• Outer Rumford Export– All lines in-service limits do

not exist– Single facility out limits exist


– Limits due to stability performance (damping, unit stability and post-fault voltage recovery)• 75 MW – 215 MW



Western Maine Export Interface

• Western Maine Export– All lines in-service limits do

not exist– Single facility out limits

exist• Limit based upon one 115

kV line remaining after limiting contingency

– Limits due to stability performance (damping)• 300 MW – 500 MW



Keene Road Export Interface • Keene Road Export

– All lines in-service limit• 155 MW• Based upon one 115 kV

line remaining after limiting contingency

– Limits due to stability (post-fault voltage recovery)

– Facility out limits • 0 MW – 120 MW



Bangor Hydro Export Interface

• Bangor Hydro Export – All lines in-service limits do

not exist– Single facility out limits exist

• Limit based upon two 115 kV lines and one or two 345/115 kV TX remaining after limiting contingency

– Limits due to stability performance (damping, instability)• 200 MW – 440 MW

– Behind the constraint . . . • ~940 MW of generation• ~270 MW more proposed


Bangor Hydro + Keene Road Export Interface

• Bangor Hydro + Keene Road Export – All lines in-service limits do not

exist– Single facility out limits exist

• Limit based upon two 115 kV lines and one or two 345/115 kV TX remaining after limiting contingency

– Limits due to stability performance (damping, instability)• 200 MW – 580 MW



Orrington Import Interface

• Orrington Import– All lines in-service limits do not

exist– Single facility out limits exist


– Limits due to stability performance (post fault voltage recovery, inter Area instability)• 250 MW – 1250 MW

– Behind the constraint . . . • ~ 320 MW of generation• ~ 1000 MW New Brunswick• ~ 240 MW More proposed


Orrington South Interface

• Orrington South– All lines in-service limit is

1050 MW - 1200 MW– Single facility out limits exist

• Numerous combinations– Limits due to thermal,

voltage and stability performance • 200 MW – 1200 MW



Surowiec South Interface

• Surowiec South– All lines in-service limit is

1150 MW – Single facility out limits exist

• Numerous combinations– Limits due to stability

performance (damping, unit stability and post-fault voltage recovery) • 300 MW – 1150 MW



Documents

MARCH 31, 2014