MINUTES OF THE RELIABILITY COMMITTEE (RC) MEETING HELD ON JULY 13, 2021 VIA WEBEX TELECONFERENCE

approve the minutes of the following RC meetings as distributed to the committee for the July 13, 2021 meeting together with any changes agreed to at the meeting and such non-substantive

MINUTES OF THE RELIABILITY COMMITTEE (RC) MEETING

HELD ON JULY 13, 2021 VIA WEBEX TELECONFERENCE

R Stein

Vice Chair Generation Generation Group Member, NRG Power Marketing Supplier HQ Energy Services, PSEG Energy Resources & Trade Alternative

Resource SunEdison

M Lyons Secretary ISO New England Inc.

D Cavanaugh Publicly Owned/Supplier Energy New England/Block Island

L Delaney AlternativeResource Borrego Solar

F Ettori Transmission VELCO

J Fenn Transmission Versant Power

B Forshaw Publicly Owned CMEEC

B Fowler

Generation/

Supplier/

Alternative Resource

Nautilus Power/Emera Energy/Exelon Generation/Great River

Hydro/Wheelabrator

B Jagolinzer Transmission Avangrid

H Hastings Generation Deepwater Wind Block Island

S Kaminski Publicly Owned New Hampshire Electric CoOp

T Kaslow Generation First Light Power Management

A Krish Generation Boreas Renewables

J Martin Transmission New England Power Company

B McKinnon Publicly Owned South Hadley Electric Department, Norwood Municipal Light Department

D Norman Transmission Versant Power

H Presume Transmission VELCO

M Purdie Generation Dominion Energy

Galt Power, Cross Sound Cable, BP Energy, Mercuria Energy and DTE Energy

B Swalwell AlternativeResource Tangent Energy

B Thomson Publicly Owned MMWEC

J Viadero Publicly Owned MMWEC

A Worsley AlternativeResource Large RG Group Member

Guest Affiliation

E Annes Connecticut Department of Public Utilities

D Bergeron Maine Public Utilities Commission

M

G Heimgartner Maine Public Utilities Commission

P Holloway Massachusetts Public Utilities Commission

B Marszalkowski ISO New England Inc

D Phelan New Hampshire Public Utilities Commission

T Shakespeare Massachusetts Department of Public Utilities

Item 1.0 – Chair’s Remarks

Ms Emily Laine welcomed the committee and reviewed the day’s agenda

There was a quorum in all sectors with the exception of End User

Item 2.0 – Working Group and Project Updates

Ms Amy Crowley (ISO-NE) provided an update regarding the activities of the Power Supply Planning Committee (PSPC)

 The next Power Supply Planning Committee meeting is scheduled for July 27 where we plan

to review results of the FCA 16 tie benefits study Over the last few PSPC meetings, the committee discussed and resolved issues regarding some modeling methodology changes for this year’s ICR and related values calculations One is a new methodology establishing availability assumptions for Active-Demand Capacity Resources The other includes some modeling methodology changes for stand-alone battery storage resources and co-located non-intermittent battery storage resources With no objections noted at the PSPC, the ISO will be moving forward with these changes in this year’s ICR and related values calculations for FCA 16

Ms Amy Crowley (ISO-NE) provided an update regarding the activities of the Variable Resources Working Group (VRWG)

 The next meeting of the Variable Resource Working Group is this Thursday, July 15 The ISO will be describing its new process for enabling automatic re-declaration of Ecomax and EcoMin for solar generator assets This process is similar to the automated process used by wind and hydro DNE dispatchable The solar autoredec process becomes effective on August

2, 2021

Mr Steven Judd (ISO-NE) provided an update regarding the Future Grid Reliability Study (FGRS)

 The 2021 Economic Study / Future Grid Reliability Study (FGRS) Phase I project is

proceeding on schedule We have completed assumption presentations for the production cost and ancillary services studies and presented preliminary results at the June PAC We will be presenting additional results at the July 22nd PAC meeting with the remaining

preliminary production cost results at the August PAC meeting Ancillary services

preliminary results are scheduled to be presented at the September PAC with probabilistic analyses scheduled for the fall We look forward to the September joint RC/MC meeting to discuss any revisions to the assumptions Please work with RC and MC leadership if any stakeholders would like to make a presentation at the next joint meeting

Item 3 0 – Meeting Minutes

A review was performed of the June 15, 2021 Reliability Committee Meeting Minutes

There were no questions regarding the meeting minutes

Resolved, the Reliability Committee recommends that ISO New England Inc approve the minutes of

the following RC meetings as distributed to the committee for the July 13, 2021 meeting together with any changes agreed to at the meeting and such non-substantive changes as may be agreed to after the meeting by the Chair and Vice-Chair of the Reliability Committee:

 June 15, 2021

The motion was then voted Based on a voice vote, the motion passed with none opposed and no abstentions

Item 4.0 – Consent Agenda

The committee reviewed the July 13, 2021 Consent Agenda

Consent Agenda projects included the following:

Item 4.1 – University Solar Victory Highway West Greenwich Solar Rev 1 - Level 0 – NEP-18-G12-Rev 1

Item 4.2 – South Forty Solar Sunset Cliff Road Burlington Solar - Level 0 – BED-21-G01

Item 4.3 – Verogy East Road East Windsor Solar Rev 1 - Level 0 – ES-19-G88-Rev 1

Item 4.4 – NextGrid Franklin Road Jay Solar – Level 0 – CMP-21-G20

Item 4.5 – Odiorne Lane Eliot Solar – Level 0 – CMP-21-G22

Item 4.6 – NextGrid Washington Street Wrentham Solar and Battery – Level 0 – NEP-21-GNF12 Item 4.7 – Western Mass Cluster Study Part 2 – Amp Solar Development Leverett Road Shutesbury Solar and Battery 1 – Level 0 – NEP-21-GNF13

Item 4.8 – Western Mass Cluster Study Part 2 – Amp Solar Development Pratt Corner Road

Shutesbury Solar and Battery 2 Rev 1 – Level 0 – NEP-20-G03-069-Rev 1

Item 4.9 – Western Mass Cluster Study Part 2 – Amp Solar Development Pratt Corner Road

Shutesbury Solar and Battery 3 Rev 1 – Level 0 – NEP-20-G03-070-Rev 1

Item 4.10 – Northeast Solar Development Alpine Road Fitchburg Solar and Battery – Level 0 - FGE-21-G01

Item 4.11 – Northeast Solar Development Oak Hill Road Fitchburg Solar and Battery – Level 0 -FGE-21-G02

Item 4.12 – Dixfield Solar Wilton Road Dixfield Solar and Battery – Level 0 – CMP-21-G21

Item 4.13 – C-203 & D-204 230 kV Line Reconductoring – Level I – NEP-21-T07

Item 4.14 – Partial Rebuild of the 690 115 kV Line – Level I – ES-21-T48

Item 4.15 – 115 kV Pequonnock Substation Rebuild Topology Change – Level I – UI-21-T01

Item 4.16 – Western RI ASO #2 DER Cluster Project – EDP Nooseneck Hill Road Hopkinton Solar PPA Withdrawal – NEP-21-G02-001

Item 4.17 – Western RI ASO #2 DER Cluster Project – EDP Skunk Hill Road Hopkinton Solar PPA Withdrawal – NEP-21-G02-004

Item 4.18 – Western RI ASO #2 DER Cluster Project – BlueWave Solar Kingstown Road Richmond Solar PPA Withdrawal – NEP-21-G02-008

Item 4.19 – Western RI ASO #2 DER Cluster Project – Direct Energy Solar Boom Bridge Road Westerly Solar PPA Withdrawal – NEP-21-G02-010

Item 4.20 – Western RI ASO #2 DER Cluster Project – Kearsarge Solar Oak Hill Road North Kingstown Solar PPA Withdrawal – NEP-21-G02-014

Item 4.21 – Western RI ASO #2 DER Cluster Project – Revity Energy Frontier Road Hopkinton Solar PPA Withdrawal – NEP-21-G02-015

Item 4.22 – Western RI ASO #2 DER Cluster Project – Direct Energy Solar Quarry Road Westerly Solar PPA Withdrawal – NEP-21-G02-016

Item 4.23 – Green Street Power North Stonington Solar PPA Withdrawal – ES-21-G125

Item 4.24 – Verogy Tripp Road Ellington Solar PPA Withdrawal – ES-20-G136

Item 4.25 – Tower Hill Synchronous Condenser PPA Withdrawal – NEP-21-T02

Item 5.0 - Level II/III Proposed Plan Applications

Agenda Item 5.1 – Mayflower Wind HVDC ETU Transmission Project (QP 837) - Level III PPAs – SENA-21-T01, SENA-21-T02, NEP-21-T08, & NEP-21-T09

Mr Paul Sousa (Eversource Energy) provided an introductory overview of the Mayflower Wind HVDC ETU Transmission Project for a +/- 400 kV, 1200 MW VSC-HVDC ETU submarine cables transmission project emanating from an offshore HVDC Converter station and interconnecting to the NGrid 345 kV Brayton Point Substation in Somerset, MA in addition to supporting on shore transmission work to interconnect the HVDC cables The proposed in service date of the project is August 2023

In response to stakeholder questions, the following comments were made:

-The proposed commercial operation in-service date is scheduled for August 2023, but that date could be changed as the project construction progresses

-The off shore wind generation project (QP 1116) that is associated with this transmission project will be brought before the RC as soon as ISO-NE can complete the study

for the generation portion of the project

-A stakeholder commented that there were concerns about the timing of the SSTI study and the potential interaction between the HVDC converter and nearby generators The Vistra representative stated that the project motion language is incomplete because it does not address the forthcoming detailed SSTI study Becacause that study has yet to be conducted, Vistra is currently unsure if there could be any adverse impacts As such, Vistra will be opposing the project ISO-NE responded that the early SSTI screen was performed as part of the SIS and full resolution of any issues uncovered will be mitigated during the

interconnection agreement process ISO-NE has also included a reference to this effect in the the ISO Recommendation Letter on how the potential interconnection issues will be

addressed going forward

The motion following was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee recommends that ISO New England Inc determine that

implementation of the Mayflower Wind HVDC ETU Transmission Project described in Proposed Plan Applications (“PPAs”) SENA-21-T01, SENA-21-T02, NEP-21-T08, NEP-21-T09 from Shell Energy North America (SENA) on behalf of Mayflower Wind and New England Power Company (NEP), as detailed in their June 25, 2021 and June 28, 2021 transmittals to ISO New England and distributed to the committee for the July 13, 2021 meeting, will not have a significant adverse effect

on the stability, reliability, or operating characteristics of the transmission facilities of the applicant, the transmission facilities of another Transmission Owner or the system of a Market Participant The motion was then voted Based on a voice vote, the motion passed with two opposed (2 Supplier) and seven abstentions (1 Generation, 2 Supplier, 2 Alternative Resource, 2 Publicly Owned)

Agenda Item 5.2 – Eversource New Hampshire Transmission Lines Rebuild Project - Level III PPAs – ES-21-T40 through ES-21-T45

Ms Meiyan Li (Eversource Energy) provided an overview of the Eversource New Hampshire Transmission Lines Rebuild Project for multiple transmission upgrades in the area The proposed in service date is December 2023

- In response to a stakeholder question, the Eversource representative stated that the post-project thermal ratings on the subject lines were limited by terminal and substation equipment An ISO-NE representative responded to a stakeholder question by stating that the Whitefield-South interface had not been reevaluated with the project in place, but is expected as the in-service date for the upgrade approaches ISO-NE also noted voltage and stability issues may limit an increase in the interface capability

The motion following was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee recommends that ISO New England Inc determine that

implementation of the Eversource New Hampshire Transmission Lines Rebuild Project described in Proposed Plan Applications (“PPAs”) ES-21-T40, ES-21-T41, ES-21-T42, ES-21-T43, ES-21-T44, ES-21-T45 from Eversource Energy (ES) as detailed in their June 23, 2021 transmittal to ISO New England and distributed to the committee for the July 13, 2021 meeting, will not have a significant adverse effect on the stability, reliability or operating characteristics of the transmission facilities of the applicant, the transmission facilities of another Transmission Owner or the system of a Market Participant

The motion was then voted Based on a voice vote, the motion passed with none opposed and no abstentions

Agenda Item 5.3 – Walden Renewables Solar Generation and Transmission Project (QP 911) – Level III PPAs – CMP-21-G19 & CMP-21-T05

Mr Bruce Jagolinzer (CMP) provided an overview of the Walden Renewables Solar Generation and Transmission Project for the construction of a 135 MW solar facility in Sweden, ME and associated transmission work to install a second 115/34.5 kV transformer equivalent to the existing 40/45/57 MVA 115/34.5 kV transformer in a new bay (straight bus configuration) at the Lovell Substation The proposed in service date is December 2023

- In response to a stakeholder question regarding the PPA where it was stated that the project has a functioning governor, an ISO representative stated that the inverters have the capability to act as a governor, but the response may be limited to only decreasing output, dependent on whether the output of the panels had been limited

The following motion was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee recommends that ISO New England Inc determine that

implementation of the Walden Renewables Solar Generation and Transmission Project described in Proposed Plan Applications (PPAs) CMP-21-G19 and CMP-21-T05 from Central Maine Power Company (CMP) on behalf of Walden Renewables, as detailed in their June 28 2021 transmittal to ISO New England and distributed to the committee for the July 13, 2021 meeting, will not have a significant adverse effect on the stability, reliability or operating characteristics of the transmission facilities of the applicant, the transmission facilities of another Transmission Owner or the system of

a Market Participant

The motion was then voted Based on a voice vote, the motion passed with none opposed and no abstentions

Agenda Item 5.4 – New London Submarine Base Gas Generation Project (QP 1134) - Level III PPA – CMEEC-21-G01

Mr Brian Forshaw (CMEEC) provided an overview of the New London Submarine Base Gas Generation Project for the installation of two 5.4 MW gas generators (10.8 MW total output) in Groton, CT and interconnecting to the SUBASE Substation via the M3N and M5N 33 kV circuits The proposed in service date of the project is October 15, 2022

There were no questions from the committee on this topic

The following motion was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee recommends that ISO New England Inc determine that

implementation of the New London Submarine Base Gas Generation Project described in Proposed Plan Application (PPA) CMEEC-21-G01 from Connecticut Municipal Electric Energy Cooperative (CMEEC) on behalf of the Groton Utilities, as detailed in their June 28, 2021 transmittal to ISO New England and distributed to the committee for the July 13, 2021 meeting, will not have a significant adverse effect on the stability, reliability, or operating characteristics of the transmission facilities of the applicant, the transmission facilities of another Transmission Owner or the system of a Market Participant

The motion was then voted Based on a voice vote, the motion passed with none opposed and no abstentions

Agenda Item 5.5 – Cape Cod Provincetown Battery Storage Project – Level III PPA – ES-21-G86

Mr Goodarz Ghanavati (Eversource Energy) provided an overview of the Cape Cod Provincetown Battery Storage Project for the installation of 24.9/-15 MW/38 MWh battery storage generator in Provincetown, MA and interconnecting to the Wellfleet Substation via the 96 23 kV circuit The proposed in service date of the project is September 1, 2021

The Eversource representative provided the following statements in response to stakeholder

questions:

- This is a distribution level installation project and not a PTF a transmission project

- The in-service date is correctly stated as September 1, 2021

- There are no plans to operate the resource based on market signals The unit will support local area reliability transmission

The following motion was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee recommends that ISO New England Inc determine that

implementation of the Cape Cod Battery Storage Project described in Proposed Plan Application (PPA) ES-21-G86 from Eversource Energy (ES), as detailed in their June 24, 2021 transmittal to ISO New England and distributed to the committee for the July 13, 2021 meeting, will not have a significant adverse effect on the stability, reliability or operating characteristics of the transmission facilities of the applicant, the transmission facilities of another Transmission Owner or the system of

a Market Participant

The motion was then voted Based on a voice vote, the motion passed with none opposed and no abstentions

Agenda Item 5.6 – Medway Battery Energy Storage Generator and Transmission Project Introduction (QP 844)

Mr Justice Nyarko (Able Grid Energy) provided an introductory overview of the Medway Battery Energy Storage Generator and Transmission Project for the construction of a 250 MW/500 MWh battery storage generator in Medway, MA The resource will interconnect to the West Medway substation The project will also include one 131 2.5 MVA 0.55/34.5 generator step up transformers, one 345/34.5/13.8 kV load tap changing main power transformer and generator tie line from the West Medway substation to the battery facility alone with one 345 kV breaker, two 345 kV breaker disconnects, one line terminal structure, and three Capacitor Coupled Voltage Transformers and other transmission interconnection work The proposed in service date of the project is May 31,

2023

In response to a stakeholder question, Eversource stated that the project transformer rating is 300 MVA

This project will be voted on at a future Reliability Committee meeting

Agenda Item 5.7 – Vineyard Wind Generation Project Introduction (QP 792)

Mr Jack Arruda (Vineyard Wind) provided an introductory overview of the Vineyard Wind

Generation Project for the construction of 92 9.5 MW MHI-Vestas offshore wind turbines (limited

to 9.375 MWs each for 862.5 MW total output) south of Martha’s Vineyard, MA The project will interconnect to the 345 kV Montville onshore substation The onshore transmission work will consist of 220/345 kV substation with 220/345 kV switchgear, two 400 MVA 345/220 kV on-load tap changing transformers, two -150/+150 MVAR STATCOMS to be connected to each 345 kV bus, two variable shunt reactors for each circuit and two harmonic filters and associated 50 MVAR fixed shunt reactors The offshore transmission work will have two 220/66 kV 450 MVA on-load changing transformers, 220 kV and 66 kV switchgear, two 200 MVAR fixed shunt reactors

connected to each 220 kV cable and two 93 mile 220 kV submarine and a 9 mile terrestrial cables The proposed in service date of the project is May 31, 2023

In response to stakeholder questions, the Vineyard Wind representative provided the following statements:

- This project has a separate QP and is unrelated to the other Vineyard Wind projects with different queue positions

- The project elected to use AC cables versus installing two HVDC cables The reason was due to economics and the AC cable distance will be addressed with midpoint

reactors

- The maximum MW injection at the point of interconnection will be 806 MWs

- This project is not part of the Cape Cod Cluster due to the project location and point of interconnection

- A representative from Dominion Energy commented that the project could impact the Millstone nuclear units Millstone requires two independent outside power sources The representative for Millstone noted for the wider RC that any project with interaction with this resource will require extensive and time consuming permitting from the NRC and that all project sponsors should take that process into account as they move forward and work with them as early as possible

- A stakeholder asked whether it would be more efficient or productive for the ISO to

consider using synchronous condensers instead of STATCOMs during the interconnection process in projects like these.  The project sponsor noted that the needs were met with STATCOMs From a project perspective, there was no need for a synchronous condenser.  ISO-NE confirmed that the needs were met in accordance with the interconnection standards, and that the review that was described by the stakeholder, to consider the need for future inertia when making these decisions in the interconnection space, would require Tariff changes.  It was noted that this is why this issue is being raised because it brings awareness

to a problem that the region could be missing low cost opportunities to add inertia to the system by swapping STATCOMs for synchronous condensers

A vote on this project will be taken at a future Reliability Committee meeting

Agenda Item 6.0 - Transmission Cost Allocations (TCAs)

Agenda Item 6.1 – UI Pequonnock Substation Rebuild Project TCA - UI-21-TCA-01

Mr Edward Roedel (Avangrid) provided a review of the Transmission Cost Allocation for

construction of a new green-field, NPCC Directory #4 compliant, five-bay SF6 GIS 115 kV breaker-and-a-half substation with 80kA circuit breakers and re-termination of the existing Pequonnock transmission lines due to a 100 year flood impact to the entire station, structural deficiencies (site settling), inadequate & congested control room, NPCC Directory #4 BPS deficiencies, inadequate mobile sub access, and inadequate short circuit margins Pool Supported PTF costs are $107M (2021 Estimated Costs)

There were no questions from the committee on this topic

The following motion was moved and seconded by the Reliability Committee:

Resolved, the Reliability Committee has reviewed the requested $106,106,899.00 (2021 Estimated

Costs) of Transmission Upgrade costs for work associated with the Pequonnock Substation rebuild Project, as described in TCA Application UI-21-TCA-01 submitted to ISO New England on June

22, 2021 by United Illuminating - AVANGRID; and the Reliability Committee recommends that ISO New England approve, as consistent with the criteria set forth in Section 12C of the ISO New England Open Access Transmission Tariff for receiving regional support and inclusion in Pool-Supported PTF Rates, the requested $106,106,899.00 as eligible for Pool-Pool-Supported PTF cost