NYISO Zones — LoadFlow

A

Zone A — West NY

Low Risk

Binding InterfaceDysinger East

CY23 Queue Depth~3,200 MW

Storage ICAP0 MW

Key ProjectsRidge View 350MW, Niagara Dolomite 180MW, Genesee Road 250MW

STAMP substation (Q580) online improves Dysinger East transfer significantly. Somerset 686MW coal retired — capacity gap being filled by solar. West Central transfer increased 588 MW with CY23 projects. Headroom payments to Q596 Alle Catt II Wind from Q858 + Q1080 ($14.3M).

B

Zone B — Genesee

Low Risk

Binding InterfaceWest Central

CY23 Queue Depth~1,800 MW

Storage ICAP0 MW

Key ProjectsCider Solar 500MW, Heritage Wind 200MW, Horseshoe Solar 180MW

Prior Class Year projects (CY21) accepted. Heritage Wind + Horseshoe Solar modeled in ATBA. Large solar pipeline continues. West Central interface not binding in CY23 — significant headroom available.

C

Zone C — Central

Moderate

Binding InterfaceVolney East / NY-PJM

CY23 Queue Depth~4,200 MW

Storage ICAP0 MW

Key ProjectsMainesburg ESS 130MW, White Creek Solar 135MW, Brookside Solar 100MW

Largest CY23 project count by number. NY-PJM interface impacts Q858, Q880, Q1036, Q1080, Q1088, Q1148, Q1151, Q1009. Multiple PJM Affected System studies — no OUFs identified on PJM system. Headroom events on Hillside 230kV PAR.

D

Zone D — North

Low Risk

Binding InterfaceMoses South

CY23 Queue Depth~1,100 MW

Storage ICAP0 MW

Key ProjectsNorth Country Wind 306MW, Fort Covington 250MW, Two Rivers Solar 200MW

NYPA corridor. Moses-Adirondack 345kV uprate (Q1125) online 2025 — 2,177 MVA capacity, major enabler. BPS classification at Q866, Q1183, Q1184 POIs (all 345kV). Moses South transfer increased 331 MW with CY23 ATRA projects.

E

Zone E — Mohawk Valley

Low Risk

Binding InterfaceTotal East / Central East

CY23 Queue Depth~980 MW

Storage ICAP0 MW

Key ProjectsMill Point Solar 250MW, Rich Road Solar 240MW, Deer River Wind 100MW

NGrid and NYPA territory. Black River corridor (Q560 Deer River Wind, Q1136 Honey Ridge Solar) — new Babbits Corner ring bus station SUF $15.7M shared. Total East and Central East not binding in CY23. Volney-Clay 345kV upgrade (NGrid) in service 2022.

F

Zone F — Capital

Moderate

Binding InterfaceTotal East

CY23 Queue Depth~620 MW

Storage ICAP0 MW

Key ProjectsFlat Creek Solar 200MW, Flat Creek Solar 2 100MW

NYPA territory. Edic-Princetown 345kV Line 352 is the POI for both Flat Creek projects. BPS: Q1089 + Q1115 POI 345kV classified BPS — no additional SUF. Marcy Control Center security room expansion SUF $264K shared. CHGE territory at southern end — Total East interface.

G

Zone G — Hudson Valley

Moderate

Binding InterfaceUPNY-CONED

CY23 Queue Depth~540 MW

Storage ICAP0 MW

Key ProjectsEast Fishkill 205MW, Catskill Grid 100MW, KCE NY 19 79MW

CHGE territory. East Fishkill (Q1122) critical flag: resource curtailment may be required on Merritt Park-Forgebrook and related 115kV lines. If curtailed via out-of-merit instruction, Q1122 not eligible for DAMAP. KCE NY 8a (Q770) and NY 19 (Q974) both clear contingencies. UPNY-CONED transfer increased 18.8 MW with CY23 projects.

Q1122 East Fishkill — DAMAP eligibility at risk if curtailment required

H

Zone H — Millwood

High Risk

Binding InterfaceNone binding (CY23)

CY23 Queue Depth~120 MW

Storage ICAP0 MW

Capacity Lost2,067 MW (Indian Point)

Indian Point 2 (1,027 MW) and Indian Point 3 (1,040 MW) both retired — modeled out of CY23 ATBA. Largest single capacity loss in NYCA. ConEd territory. Drives urgency for new downstate generation. Champlain Hudson Power Express (Q631, 1,000 MW DC) modeled as incoming — brings significant Zone J/H capacity relief.

2,067 MW nuclear capacity retired — major reliability gap

I

Zone I — Dunwoodie

Low Risk

Binding InterfaceNone binding

CY23 Queue Depth~80 MW

Storage ICAP0 MW

Small zone. ConEd territory. No CY23 projects directly interconnecting here. Dunwoodie South interface not binding in base case — SUF triggered only by sensitivity analysis with Q1016/Q1017/Q1199 in NYC.

J

Zone J — New York City

High Risk

Binding InterfaceDunwoodie South / Mott Haven 345kV

CY23 Queue Depth~4,800 MW

Storage ICAP0 MW

Key ProjectsEI Steinway 1+2 (2,600MW), CPNY-X 1,300MW, Buchanan Point 300MW

Largest CY23 SUF total — EI Steinway 1+2 alone $952M each. Mott Haven reconductoring $220M + shunt reactors $159M required. BPS: NEW_AST_EST1 + EST2 345kV. Fault current: SR41/42 at Gowanus operational mitigation. DEC Peaker Rule: Gowanus 2+3+Narrows ~610MW seasonally deactivated. Gowanus 1+4 series fully retired. Champlain Hudson Power Express (1,000 MW DC) in ATBA system.

Gowanus + Narrows 610 MW seasonal deactivation — reliability pressure May-Sep

K

Zone K — Long Island

High Risk

Binding ConstraintPilgrim-West Bus 138kV PAR

ASDU Total Cost$520.6M

CY23 Queue Depth2,477 MW

Storage ICAP0 MW delivered

LIPA Import Limit1,621 MW (ATBA normal)

LI Byway SDUPAR $295M + 5 supporting upgrades

All 10 CY23 ASDU projects here — 825, 957, 971, 1012, 1117, 1123, 1254, 1255, 1256, 1257. Q680 Juno Power Express (1,200 MW) fully deliverable — separate POI. DEC Peaker Rule: Shoreham 67MW + Glenwood 55MW + Northport 14MW deactivated (LIPA reliability waiver expired May 2025). Nassau Energy 52MW retired. 5 of 10 ASDU projects completed. 0 MW battery storage currently delivering ICAP in Zone K.

0 MW battery ICAP in market — 2,477 MW queued. The entire Zone K storage buildout is still in the pipeline.