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September 5, 2014

September 5, 2014. PUBLIC VERSION. 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/EMERA Maine Projects

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September 5, 2014

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  1. September 5, 2014 PUBLIC VERSION Maine 2014 Outage Coordination CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  2. Agenda • Welcome, Introductions and Safety • Expectations and Goals for Meeting • MPRP Project Update • Other CMP/EMERA Maine Projects • Specific Outage Discussion, Key Fall 2014/Spring 2015 outages • Questions CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  3. Expectations/Goals • Communicate significant planned 2014/2015 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  4. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  5. Northern Loop Construction • Construction Status • Belfast 115kV tap completed • Near term construction activities • Coopers Mills Road Substation energization • Construction of one new 345kV line and one new 115kV line • Future construction activities • None CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  6. Central Loop Construction • Construction Status • Livermore Falls Substation energized • New 115kV line from Rumford to Larrabee Road energized • Near term construction activities • 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 • Completion of Coopers Mills Road tie-ins and energization CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  7. Southern Loop • Construction Status • Maguire Road 345kV energization • Construction of new Maguire Road – Eliot 345kV line complete • Near term construction activities • Eliot Substation final energization • Maguire Road Substation final energization • Future construction activities • None CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  8. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  9. Maine 2014/2015 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 2014/2015 will be discussed • Long (greater than one week) duration outages • Significant potential generation constraints CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  10. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  11. Transmission system limitations All facility in and single facility out conditions CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  12. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  13. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  14. 2014 Maine Major Outages - Update • 115 kV Outage Condition B Western Maine • 3rd Qtr 2013 – 4th Qtr 2013 ~ 3 month duration (Completed) • 2nd Qtr 2014 ~ 2 week duration (Completed) • 345 kV Outage Condition L Northern Maine Area • 1st and 2nd Qtr 2014 ~ 7 weeks (Completed) • 115 kV Outage Condition M Western Maine • 2nd Qtr 2014 ~ 1 week (Completed) • 345 kV and 115 kV Outage Condition N Central Maine • 2nd Qtr 2014 ~ 1 week (Completed) • 345 kV Outage Condition O Northern Maine • 1st outage 3rd Qtr 2014 ~ 1 week (Completed live line) CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  15. 2013-14 Maine Major Outages – Update (cont.) • 345 kV Outage Condition O Northern Maine • 2nd outage 3rd Qtr 2014 ~ 2 weeks • 3rd outage 1st Qtr 2015 ~ 1 week • 345 kV Outage Condition P Southern Maine • 3rd Qtr 2014 ~ 1 week • 4th Qtr 2014 ~2 weeks • 345 kV Outage Condition Q Southern Maine • 4th Qtr 2014 ~ 4 weeks

  16. 2013-14 Maine Major Outages – Update (cont.) • 345 kV Outage Condition R Southern Maine • 1st Outage 3rd Qtr 2014 ~ 4 weeks • 2nd Outage 4th Qtr 2014 ~ 5 weeks • 115 kV Outage Condition S Central Maine • 4th Qtr 2014 through 1st Qtr 2015 ~ 2 months • 345 kV Outage Condition T Central Maine • 1st Qtr 2015 ~ 2 weeks

  17. 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

  18. 345 kV Outage Condition O Northern Maine (cont.) • Potential options to be assessed, partial MPRP completions: • Assess if some of the outage can be accomplished live-line • 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 • Eliminates 1st contingency controlled islanding of the Maritimes • Reduces must run of specific generators • Reduces do not exceed limits on specific generators • Generators inside the Bangor Hydro + Keene Road Export Interface able to compete for limited transfer capability • 1st outage • Originally scheduled for 3rd Qtr 2014 ~ 1 week • Already completed entire outage live line • No impact to generation or interface transfer limit reductions

  19. 345 kV Outage Condition O Northern Maine (cont.) • 2nd outage • Originally scheduled for 4th Qtr 2014 ~ 2 weeks, moved to 3rd Qtr 2014 ~2 weeks • Planning to perform the outage with a completely different approach • Interface Limits • New Brunswick-New England Interface Limits ~250 MW, also slave to Orrington South Interface Limits • Orrington South Limits ~250 MW - 400 MW • Keene Road Export Interface Limit 155 MW • Moved to overlap other outages to minimize overall duration of restrictions • 1st Outage P – Surowiec South Limit of 50 MW – 400 MW • 1st Outage R • Maine-New Hampshire Limit of 1000 MW – 1700 MW • Northern New England Scobie + 394 Interface Limits 1300 MW – 2950 MW

  20. 345 kV Outage Condition O Northern Maine (cont.) • 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 • Planning to perform the outage with a completely different approach • Interface Limits • New Brunswick-New England Interface Limits ~ 350 MW, also slave to Orrington South Interface Limits • Orrington South Limits ~350 MW - 500 MW • Keene Road Export Limit 155 MW

  21. 345 kV Outage Condition P Southern Maine • 1st Outage 3rd Qtr 2014 ~ 1 week • Interface Limits • Surowiec South Interface Limits 50 MW – 400 MW • Moved to overlap other outages • Overlap reduces duration of significant interface limits • There is less exposure to southern interface congestion • 2nd Outage O – Orrington South Limit of ~400 MW • 1st Outage R • Maine-New Hampshire Limit of 1000 MW – 1700 MW • Northern New England Scobie + 394 Interface Limits 1300 MW – 2950 MW • 2nd Outage 4th Qtr 2014 ~ 2 weeks • Interface Limits • Surowiec South Interface Limits 50 MW – 400 MW

  22. 345 kV Outage Condition Q Southern Maine • 4th Qtr 2014 ~ 4 weeks • Interface Limits • Surowiec South Interface Limits 50 MW – 400 MW • Outage timing has environmental considerations • Moved to overlap other outages • Overlap reduces duration of significant interface limits • There is less exposure to southern interface congestion • 2nd Outage R • Maine-New Hampshire Limit of 1000 MW – 1700 MW • Northern New England Scobie + 394 Interface Limits 1300 MW – 2950 MW

  23. 345 kV Outage Condition R Southern Maine • 1st Outage 3rd Qtr 2014 ~ 4 weeks, 2nd Outage 4th Qtr 2014 ~ 5 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 • Northern New England Scobie + 394 Interface Limits 1300 MW – 2950 MW • Moved to overlap other outages • Overlap reduces duration of significant interface limits • There is less exposure to southern interface congestion • 1st Outage 3rd Qtr 2014 • 2nd Outage O – Orrington South Limit of 400 MW • 1st Outage P – Surowiec South Interface Limits 50 MW – 400 MW • 2nd Outage 4th Qtr 2014 • Outage Q - Surowiec South Interface Limits 50 MW – 400 MW • Outage duration extended to complete additional maintenance work not related to MPRP

  24. 115 kV Outage Condition S Central Maine • 4th Qtr 2014 through 1st Qtr 2015 ~ 2 months • Original plan • Interface Limits • Wyman Hydro Export Interface Limits ~50 MW – ~75 MW • Substantial impact to generators for a long duration • Current plan • Construction sequencing modified to mitigate this exposure • Interface Limits • Wyman Hydro Export Interface Limits ~150 MW – ~275 MW • Expecting ~150 MW limit for ~ 2 weeks in 4th Qtr 2014 • Expecting close to ~275 MW limit for ~ 6 weeks

  25. 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 • Overlap 3rd Outage O for 1st week • Overlap reduces duration of significant interface limits • 3rd Outage O limits are more restrictive on the Orrington South Interface ~ 500 MW • Outage T for 2nd week • Interface Limits • Orrington South Interface limit ~600 MW

  26. CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  27. References MPRP Geographic Overview Significant Maine Interfaces

  28. MPRP Geographic Overview CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  29. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  30. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  31. Outer Rumford Export Interface • Outer Rumford 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, unit stability and post-fault voltage recovery) • 75 MW – 215 MW • Behind the constraint . . . • ~645 MW of generation • ~ 255 MW more proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  32. 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 • Behind the constraint . . . • ~1050 MW of generation • ~ 470 MW more proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  33. Keene Road Export Interface • Keene Road Export • All lines in-service limit • 175 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 • Behind the constraint . . . • ~320 MW of generation • ~ 90 MW more proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  34. 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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  35. 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 • Behind the constraint . . . • ~1250MW of generation • ~ 360 MW more proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  36. Orrington Import Interface • Orrington Import • 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 (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 CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  37. 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 • Behind the constraint . . . • ~ 1120 MW of generation • ~ 1000 MW New Brunswick • ~ 510 MW More proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

  38. 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 • Behind the constraint . . . • ~ 2480 MW of generation • ~ 1000 MW New Brunswick • ~ 1160 MW More proposed CONTAINS CRITICAL ENERGY INFRASTRUCTURE INFORMATION – DO NOT RELEASE

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