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J U N E 1 0 , 2 0 1 6 | W E S T B O R O U G H , M A

Robin Lafayette E N G I N E E R , T R A N S M I S S I O N P L A N N I N G

Planning Advisory Committee

Southeastern Massachusetts and Rhode Island (SEMA-RI) Minimum Load Needs Assessment Scope of Work

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Purpose

• Present the Southeastern Massachusetts and Rhode Island (SEMA-RI) Minimum Load Needs Assessment Scope of Work

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Overview

• Background on the study effort

• Objectives

• Study area description

• Scope of needs assessment

• Schedule/next steps

• Appendix

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Background • The most recent updates for the SEMA-RI study are:

– In October 2013, EquiPower submitted an NPR request for Brayton Point Power Station for June 2017

– In February 2015, the preferred solution was selected for the Greater Boston area study and the solution components were added to the SEMA-RI study due to the influence on the area

– In February 2016, Canal 3 and Burrillville Energy Center (“BEC”) received Capacity Supply Obligations in FCA #10

– 2026 SEMA-RI Needs Assessment results presented to PAC on March 22, 2016

– Final 2026 SEMA-RI Needs Assessment report posted on May 26, 2016

• Covered summer peak load (90/10) thermal / voltage and short-circuit needs

• Links to previous SEMA-RI presentations and reports have been placed in the Appendix

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Objectives

• Evaluate the reliability performance and identify reliability‐ based transmission needs in the SEMA‐RI study area under minimum load conditions, while considering the following: – SEMA‐RI area performance under minimum New England load level

conditions – Reliability over a range of generation patterns – Retirement of Brayton Point and Pilgrim generators

• Additions of Canal 3 and Burrillville Energy Center

– Coordination with plans in Greater Boston – All applicable transmission planning reliability standards

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Study Area – SEMA-RI Geographical

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Boston Import

CT Import

West Medway - Walpole

Farnum

Somerset - Newport

Industrial Park

South Shore

Cape

CT to RI 115 kV Tie

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The diagram is shown for reference only and does not include all of the latest topology changes ISO-NE PUBIC

SEMA-RI – One Line Diagram

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Modeling Assumptions

• Base Case Topology: consistent with recently completed 2026 SEMA-RI Needs Assessment peak load study cases – All proposed and planned transmission projects as of the May 2015

RSP project listing have been included – All cleared generation as of FCA #9 were modeled, plus major FCA #10

cleared generation in SEMA-RI

• 8500 MW load plus losses in New England

• Load power factor assumptions – based on system design objectives – NE loads = 0.998 leading power factor on the low side of distribution

transformers – Boston load = 0.978 lagging power factor for downtown, 1.000 power

factor for suburban Boston on the low side of distribution transformers

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Modeling Assumptions, Cont’d.

• Seabrook OOS – One nuclear unit OOS along with Pilgrim retirement

• All major Boston gen OOS

• All Boston area reactors online

• All pumped hydro units either OOS or in pumping mode

• Low transfers across interfaces

• All capacitors OOS

• All fast-start generation OOS

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Generation Dispatches

• Testing combinations of study area units online

• 69 MW of other SEMA-RI generation online in all cases: – SEMASS (69 MW)

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Dispatch Major SEMA-RI Unit In-Service

1 No Major SEMA-RI Units In Service

2 Edgar (700 MW)

3 Tiverton (244 MW)

4 RISE (543 MW)

5 ANP Bellingham (481 MW)

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Study Methodology

• Steady state thermal and voltage analysis (including Delta-V) will be performed, for N-0 (all-facilities-in), N-1 (all-facilities-in, first contingency), and N-1-1 (facility-out, first contingency) for the described set of generation dispatches – First element out scenarios for N-1-1 testing will focus on key 345 kV

line, 345/115 kV autotransformers, and lagging reactive support devices in the SEMA-RI area

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Next Steps / Schedule

• Post the SEMA‐RI Minimum Load Needs Assessment Scope of Work and Study Files for PAC review – Q2 2016

• Complete the SEMA‐RI Minimum Load Needs Assessment, present to PAC and post draft report – Q3 2016

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APPENDIX Links to Previous SEMA-RI Presentations and Reports

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Links to Previous SEMA-RI Presentations and Reports

• Final SEMA/RI 2026 Needs Assessment Report, Appendices, Revised Results Presentation and Responses to Stakeholder Comments, posted to PAC website on May 26, 2016

– https://smd.iso-ne.com/operations-services/ceii/pac/2016/05/final_sema_ri_needs_assessment_report.pdf

• Final SEMA/RI 2026 Needs Assessment Final Study Files, posted to PAC website on April 6, 2016

– https://smd.iso-ne.com/operations-services/ceii/pac/2016/04/sema_ri_2026_needs_assessment_final_study_files.zip

• Final SEMA/RI 2026 Needs Assessment Scope of Work and Appendices, posted to PAC website on January 22, 2016

– https://smd.iso-ne.com/operations-services/ceii/pac/2016/01/sema_ri_2026_needs_assessment_scope_of_work_appendicies.zip

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Links to Previous SEMA-RI Presentations and Reports, Cont.

• Newport Aquidneck Island Transmission Area Improvements – Needs and Preferred Solutions, presented to PAC on April 28, 2015

– https://smd.iso-ne.com/planning/ceii/reports/2010s/archive/a7_newport_aquidneck_island_transmission_area_improvements_presentation.pdf

• Brayton Point Non-Price Retirement: Short Term Solutions presented to PAC on July 15, 2014

– https://smd.iso-ne.com/committees/comm_wkgrps/prtcpnts_comm/pac/ceii/mtrls/2014/jul152014/a4_brayton_pt_npr_short_term_upgrades_rev1.pdf

• Additional Southeastern Massachusetts and Rhode Island presentations and reports can be found at the following link

– http://www.iso-ne.com/committees/planning/planning-advisory

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