2020-2022 Current Year and First Future Year Annual Maintenance Schedule

September 8, 2020

Outage Coordination

To: NEPOOL Participants

From: Joseph Cohen

Subject: 2020-2022 Current Year and First Future Year Annual Maintenance Schedule

Following this transmittal letter, you will find the current ISO New England Annual Maintenance Schedule (AMS) dated September 8, 2020 which reflects all planned resource outage requests as well as long duration Forced Outages for September 19, 2020 – September 23, 2022 as of September 7, 2020.

Each company submitting resource outage requests should consider the data market sensitive in accordance with the ISO New England Information Policy, which can be found at: http://www.iso- ne.com/static-assets/documents/regulatory/tariff/attach_d/attachment_d.pdf

2020-22 OPERABLE CAPACITY ANALYSIS The two-year Operable Capacity Analysis presently forecasts the lowest Long Term Operable Capacity Margin (LTOCM) for the next 12 months as follows:

 Fall 2020: 1,923 MW for week beginning September 19, 2020  Winter 2020/2021: 2,567 MW for week beginning January 2, 2021  Spring 2021: 4,514 MW for week beginning May 15, 2021  Summer 2021: -75 MW for week beginning September 11, 2021

If you have any questions concerning this edition of the AMS or Operable Capacity Analysis, contact Long- term Outage Coordination by email at [email protected].

ISO New England Inc. iso-ne.com One Sullivan Road isonewswire.com

Holyoke, MA 01040 -2841 @isonewengland

iso-ne.com/isotogo ISO-NE PUBLIC iso-ne.com/isoexpress

ISO-NE 2020-22 OPERABLE CAPACITY ANALYSIS September 8, 2020 - 50-50 FORECAST using CSO MW This analysis is a tabulation of weekly assessments shown in one single table. The information shows the operable capacity situation under assumed conditions for each week. It is not expected that the system peak will occur every week during June, July, August, and Mid September.

EXTERNAL NON PLANNED ALLOWANCE GEN AT RISK OPER RESERVE STUDY WEEK (Week AVAILABLE Active Capacity NODE AVAIL COMMERCIAL OUTAGES CSO FOR UNPLANNED DUE TO GAS NET OPCAP PEAK LOAD REQUIREMENT NET LOAD OPCAP MARGIN Beginning, OPCAP MW Demand MW CAPACITY MW CAPACITY MW MW OUTAGES MW SUP MW SUPPLY MW FORECAST MW MW OBLIGATION MW MW Saturday) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] 9/19/2020 30,237 411 774 7 4,260 2,100 0 25,069 20,841 2,305 23,146 1,923 9/26/2020 30,401 411 996 7 4,668 2,800 0 24,347 15,066 2,305 17,371 6,976 10/3/2020 30,401 411 996 7 7,919 2,800 0 21,096 15,104 2,305 17,409 3,687 10/10/2020 30,401 411 996 7 7,145 2,800 0 21,870 16,076 2,305 18,381 3,489 10/17/2020 30,401 411 1,096 7 7,703 2,800 0 21,412 16,459 2,305 18,764 2,648 10/24/2020 30,401 411 996 7 6,439 2,800 0 22,576 16,677 2,305 18,982 3,594 10/31/2020 30,446 537 1,025 7 5,904 3,600 0 22,511 16,798 2,305 19,103 3,408 11/7/2020 30,446 537 1,025 7 4,055 3,600 0 24,360 17,160 2,305 19,465 4,895 11/14/2020 30,446 537 1,025 7 4,241 3,600 0 24,174 17,936 2,305 20,241 3,933 11/21/2020 30,446 537 1,025 7 3,092 3,600 152 25,171 18,694 2,305 20,999 4,172 11/28/2020 30,446 537 1,025 7 1,531 3,600 2,038 24,846 19,009 2,305 21,314 3,532 12/5/2020 30,459 533 1,025 7 334 3,200 2,479 26,011 19,313 2,305 21,618 4,393 12/12/2020 30,459 533 1,025 7 601 3,200 2,419 25,804 19,325 2,305 21,630 4,174 12/19/2020 30,459 533 1,025 7 293 3,200 2,909 25,622 19,390 2,305 21,695 3,927 12/26/2020 30,459 533 1,025 7 293 3,200 3,270 25,261 19,390 2,305 21,695 3,566 1/2/2021 30,459 533 1,025 7 293 2,800 3,893 25,038 20,166 2,305 22,471 2,567 1/9/2021 30,459 533 1,025 7 293 2,800 3,888 25,043 20,166 2,305 22,471 2,572 1/16/2021 30,459 533 1,025 7 368 2,800 3,737 25,119 20,166 2,305 22,471 2,648 1/23/2021 30,459 533 1,025 7 293 2,800 3,270 25,661 19,933 2,305 22,238 3,423 1/30/2021 30,459 533 1,025 7 293 3,100 2,958 25,673 19,933 2,305 22,238 3,435 2/6/2021 30,459 533 1,025 7 293 3,100 2,647 25,984 19,652 2,305 21,957 4,027 2/13/2021 30,459 533 1,025 7 753 3,100 2,336 25,835 19,622 2,305 21,927 3,908 2/20/2021 30,459 533 1,025 7 764 3,100 1,869 26,291 19,346 2,305 21,651 4,640 2/27/2021 30,459 533 1,025 7 1,068 2,200 1,557 27,199 18,308 2,305 20,613 6,586 3/6/2021 30,459 533 1,025 7 1,074 2,200 1,246 27,504 17,941 2,305 20,246 7,258 3/13/2021 30,459 533 1,025 7 1,080 2,200 623 28,121 17,736 2,305 20,041 8,080 3/20/2021 30,459 533 1,025 7 1,847 2,200 0 27,977 17,352 2,305 19,657 8,320 3/27/2021 30,446 537 1,025 7 1,103 2,700 0 28,212 16,759 2,305 19,064 9,148 4/3/2021 30,446 537 1,025 7 5,100 2,700 0 24,215 16,134 2,305 18,439 5,776 4/10/2021 30,446 537 1,025 7 6,110 2,700 0 23,205 15,870 2,305 18,175 5,030 4/17/2021 30,446 537 1,025 7 6,202 2,700 0 23,113 15,335 2,305 17,640 5,473 4/24/2021 30,446 537 1,025 7 4,275 2,700 0 25,040 15,057 2,305 17,362 7,678 5/1/2021 30,446 537 1,025 7 3,730 3,400 0 24,885 15,029 2,305 17,334 7,551 5/8/2021 30,446 537 1,025 7 3,237 3,400 0 25,378 18,118 2,305 20,423 4,955 5/15/2021 30,446 537 1,025 7 2,644 3,400 0 25,971 19,152 2,305 21,457 4,514 5/22/2021 30,446 537 1,025 7 1,277 3,400 0 27,338 20,113 2,305 22,418 4,920 5/29/2021 29,057 520 1,208 7 777 2,800 0 27,215 24,981 2,305 27,286 -71 6/5/2021 29,057 520 1,208 7 293 2,800 0 27,699 24,981 2,305 27,286 413 6/12/2021 29,057 520 1,208 7 293 2,800 0 27,699 24,981 2,305 27,286 413 6/19/2021 29,057 520 1,208 7 293 2,800 0 27,699 24,981 2,305 27,286 413 6/26/2021 29,057 520 1,208 7 293 2,800 0 27,699 24,981 2,305 27,286 413 7/3/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 7/10/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 7/17/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 7/24/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 7/31/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 8/7/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 8/14/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 8/21/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 8/28/2021 29,057 520 1,208 7 0 2,100 0 28,692 24,981 2,305 27,286 1,406 9/4/2021 29,057 520 1,208 7 725 2,100 0 27,967 24,981 2,305 27,286 681 9/11/2021 29,057 520 1,208 7 1,481 2,100 0 27,211 24,981 2,305 27,286 -75 9/18/2021 29,057 520 1,208 7 1,840 2,100 0 26,852 20,759 2,305 23,064 3,788 9/25/2021 29,436 520 1,135 7 3,779 2,800 0 24,519 20,662 2,305 22,967 1,552 10/2/2021 29,436 520 1,135 7 5,765 2,800 0 22,533 14,921 2,305 17,226 5,307 10/9/2021 29,436 520 1,135 7 4,919 2,800 0 23,379 14,959 2,305 17,264 6,115 10/16/2021 29,436 520 1,135 7 5,838 2,800 0 22,460 15,941 2,305 18,246 4,214 10/23/2021 29,436 520 1,135 7 6,235 2,800 0 22,063 16,329 2,305 18,634 3,429 10/30/2021 29,436 520 1,135 7 4,266 3,600 0 23,232 16,548 2,305 18,853 4,379 EXTERNAL NON PLANNED ALLOWANCE GEN AT RISK OPER RESERVE STUDY WEEK (Week AVAILABLE Active Capacity NODE AVAIL COMMERCIAL OUTAGES CSO FOR UNPLANNED DUE TO GAS NET OPCAP PEAK LOAD REQUIREMENT NET LOAD OPCAP MARGIN Beginning, OPCAP MW Demand MW CAPACITY MW CAPACITY MW MW OUTAGES MW SUP MW SUPPLY MW FORECAST MW MW OBLIGATION MW MW Saturday) [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] 11/6/2021 29,436 520 1,135 7 2,803 3,600 0 24,695 16,671 2,305 18,976 5,719 11/13/2021 29,436 520 1,135 7 1,784 3,600 546 25,168 17,037 2,305 19,342 5,826 11/20/2021 29,436 520 1,135 7 1,594 3,600 1,156 24,748 17,822 2,305 20,127 4,621 11/27/2021 29,436 520 1,135 7 756 3,600 2,038 24,704 18,587 2,305 20,892 3,812 12/4/2021 29,460 521 1,135 7 584 3,200 2,207 25,132 18,906 2,305 21,211 3,921 12/11/2021 29,460 521 1,135 7 312 3,200 2,686 24,925 19,213 2,305 21,518 3,407 12/18/2021 29,460 521 1,135 7 292 3,200 2,909 24,722 19,224 2,305 21,529 3,193 12/25/2021 29,460 521 1,135 7 292 3,200 3,270 24,361 19,291 2,305 21,596 2,765 1/1/2022 29,460 521 1,135 7 292 2,800 3,893 24,138 19,581 2,305 21,886 2,252 1/8/2022 29,460 521 1,135 7 292 2,800 3,888 24,143 20,075 2,305 22,380 1,763 1/15/2022 29,460 521 1,135 7 292 2,800 3,737 24,294 20,075 2,305 22,380 1,914 1/22/2022 29,460 521 1,135 7 292 2,800 3,270 24,761 20,075 2,305 22,380 2,381 1/29/2022 29,460 521 1,135 7 292 3,100 2,958 24,773 19,839 2,305 22,144 2,629 2/5/2022 29,460 521 1,135 7 292 3,100 2,647 25,084 19,555 2,305 21,860 3,224 2/12/2022 29,460 521 1,135 7 292 3,100 2,336 25,395 19,524 2,305 21,829 3,566 2/19/2022 29,460 521 1,135 7 292 3,100 1,869 25,862 19,246 2,305 21,551 4,311 2/26/2022 29,460 521 1,135 7 347 3,100 1,557 26,119 18,197 2,305 20,502 5,617 3/5/2022 29,460 521 1,135 7 362 2,200 1,246 27,315 17,826 2,305 20,131 7,184 3/12/2022 29,460 521 1,135 7 607 2,200 378 27,938 17,618 2,305 19,923 8,015 3/19/2022 29,460 521 1,135 7 1,827 2,200 0 27,096 17,231 2,305 19,536 7,560 3/26/2022 29,436 520 1,135 7 1,660 2,700 0 26,738 16,631 2,305 18,936 7,802 4/2/2022 29,436 520 1,135 7 3,878 2,700 0 24,520 16,000 2,305 18,305 6,215 4/9/2022 29,436 520 1,135 7 3,680 2,700 0 24,718 15,733 2,305 18,038 6,680 4/16/2022 29,436 520 1,135 7 3,248 2,700 0 25,150 15,192 2,305 17,497 7,653 4/23/2022 29,436 520 1,135 7 2,502 2,700 0 25,896 14,911 2,305 17,216 8,680 4/30/2022 29,436 520 1,135 7 3,305 3,400 0 24,393 14,883 2,305 17,188 7,205 5/7/2022 29,436 520 1,135 7 3,317 3,400 0 24,381 17,925 2,305 20,230 4,151 5/14/2022 29,436 520 1,135 7 2,186 3,400 0 25,512 18,968 2,305 21,273 4,239 5/21/2022 29,436 520 1,135 7 1,816 3,400 0 25,882 19,937 2,305 22,242 3,640 5/28/2022 29,436 520 1,135 7 668 3,400 0 27,030 24,861 2,305 27,166 -136 6/4/2022 28,450 591 1,192 7 292 2,800 0 27,148 24,861 2,305 27,166 -18 6/11/2022 28,450 591 1,192 7 292 2,800 0 27,148 24,861 2,305 27,166 -18 6/18/2022 28,450 591 1,192 7 292 2,800 0 27,148 24,861 2,305 27,166 -18 6/25/2022 28,450 591 1,192 7 292 2,800 0 27,148 24,861 2,305 27,166 -18 7/2/2022 28,450 591 1,192 7 292 2,100 0 27,848 24,861 2,305 27,166 682 7/9/2022 28,450 591 1,192 7 292 2,100 0 27,848 24,861 2,305 27,166 682 7/16/2022 28,450 591 1,192 7 292 2,100 0 27,848 24,861 2,305 27,166 682 7/23/2022 28,450 591 1,192 7 292 2,100 0 27,848 24,861 2,305 27,166 682 7/30/2022 28,450 591 1,192 7 0 2,100 0 28,140 24,861 2,305 27,166 974 8/6/2022 28,450 591 1,192 7 0 2,100 0 28,140 24,861 2,305 27,166 974 8/13/2022 28,450 591 1,192 7 0 2,100 0 28,140 24,861 2,305 27,166 974 8/20/2022 28,450 591 1,192 7 0 2,100 0 28,140 24,861 2,305 27,166 974 8/27/2022 28,450 591 1,192 5 0 2,100 0 28,138 24,861 2,305 27,166 972 9/3/2022 28,450 591 1,192 5 0 2,100 0 28,138 24,861 2,305 27,166 972 9/10/2022 28,450 591 1,192 5 0 2,100 0 28,138 24,861 2,305 27,166 972 9/17/2022 28,450 591 1,192 5 0 2,100 0 28,138 20,603 2,305 22,908 5,230 1. Available OPCAP MW based on resource Capacity Supply Obligations, CSO. Does not include Settlement Only Generators. 2. The active demand resources known as Real-Time Demand Response (RTDR) will become Active Demand Capacity Resources (ADCRs) and can participate in the Forward Capacity Market (FCM). These resources will have the ability to obtain a CSO and also participate in the Day-Ahead and Real-Time Energy Markets. 3. External Node Available Capacity MW based on the sum of external Capacity Supply Obligations (CSO) imports and exports. 4. New resources and generator improvements that have acquired a CSO but have not become commercial. 5. All Planned outages for the period. This value would also include any known long-term Forced Outages. 6. Allowance for Unplanned Outages includes forced outages and maintenance outages scheduled less than 14 days in advance per ISO New England Operating Procedure No. 5 Appendix A. 7. Generation at Risk due to Gas Supply pertains to gas fired capacity expected to be at risk during cold weather conditions or gas pipeline maintenance outages. 8. Net OpCap Supply MW Available (1 + 2 + 3 + 4 - 5 - 6 - 7 = 8) 9. Peak Load Forecast as provided in the 2020 CELT Report and adjusted for Passive Demand Resources assumes Peak Load Exposure (PLE) of 25,125 and does include credit of Passive Demand Response (PDR) and behind-the-meter PV (BTM PV) 10. Operating Reserve Requirement based on 120% of first largest contingency plus 50% of the second largest contingency. 11. Total Net Load Obligation (9 + 10 = 11) 12. Net OPCAP Margin MW = Net Op Cap Supply MW minus Net Load Obligation (9 - 11 = 12) ISO-NE 2020-2022 OPERABLE CAPACITY ANALYSIS -CSO- -50/50 FORECAST

11,000

10,000

9,000

8,000

7,000

6,000

5,000

4,000

3,000

2,000 Operable Capacity Margin (MW Capacity Margin Operable

1,000

0

-1,000

-2,000

1/9/2021 2/6/2021 3/6/2021 4/3/2021 5/1/2021 8/7/2021 9/4/2021 1/8/2022 2/5/2022 3/5/2022 4/2/2022 7/9/2022 8/6/2022 9/3/2022

9/19/2020 10/3/2020 1/23/2021 2/20/2021 3/20/2021 4/17/2021 5/15/2021 5/29/2021 6/12/2021 6/26/2021 7/10/2021 7/24/2021 8/21/2021 9/18/2021 10/2/2021 1/22/2022 2/19/2022 3/19/2022 4/16/2022 4/30/2022 5/14/2022 5/28/2022 6/11/2022 6/25/2022 7/23/2022 8/20/2022 9/17/2022

10/17/2020 10/31/2020 11/14/2020 11/28/2020 12/12/2020 12/26/2020 10/16/2021 10/30/2021 11/13/2021 11/27/2021 12/11/2021 12/25/2021 September 19, 2020 - September 23, 2022, W/B Saturday Forecast Temperature and Load

New England’s system load patterns have undergone changes associated with the ongoing pandemic. These changes have resulted in a reduction of overall energy usage, as well as the timing of load ramps and peak energy usage. Due to the potentially dynamic nature of the pandemic and impact to load patterns, ISO-NE will be publishing a 21-day load forecast until load patterns stabilize. The 21-day load forecast has been created by ISO-NE for utilization by generators for increased situational awareness and provide assistance to coordinate outages in the near term time horizon. The system load forecast is created by blending weather data from two vendor forecasts to create an hourly electric demand for 21 days. This forecast is not precise due to its long range, but it can be utilized as a gauge for evaluating system demand impacted by weather. This will help limit the risk to system reliability due to generators scheduling required maintenance outages during these unprecedented times.

Note for Generator Outages

To be implemented less than 15 calendar days from today: Contact Generation Outage Coordinator at [email protected] or 413-535-4378

To be implemented greater than 15 calendar days from today: Contact Connor Corsi at [email protected] or 413-540-4596

Forecast Temperature and Load Hourly Demand (MW) Hourly Temperature (F) 90 24,000 85

22,000 80 75 20,000

70 F) 18,000 65 °

MW 60 16,000

55 Temperature ( Temperature 14,000 50

12,000 45 40 10,000 35

8,000 30

9/8… 9/9…

9/21… 9/10… 9/11… 9/12… 9/13… 9/14… 9/15… 9/16… 9/17… 9/18… 9/19… 9/20… 9/22… 9/23… 9/24… 9/25… 9/26… 9/27… 9/28… Day and Time (hourly granularity)