How many power plants does National Grid Generation operate?

EIA-860M lists 12 operating plants against “National Grid Generation LLC” for 2026-07, totalling 4 GW of nameplate capacity in 1 state.

Is National Grid Generation the owner of these plants?

EIA-860M names one reporting entity per generator. That entity operates the plant on the survey; ownership can sit with a parent, a partnership or a tax-equity structure that the form does not record.

Why are affiliates listed separately?

Because EIA files them separately. Rolling subsidiaries into a parent would need an ownership map EIA-860M does not publish, so this page does not invent one.

National Grid Generation power plants

Every generating plant EIA-860M files against National Grid Generation for 2026-07: 12 plants, 4 GW of nameplate capacity, across 1 state and 2 energy sources.

EIA files this entity as “National Grid Generation LLC”.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 12
Nameplate capacity: 4 GW
States: 1; NY
Energy sources: 2

National Grid Generation plants by energy source

Natural gas4 plants · 2,853 MW
Petroleum8 plants · 1,092 MW

Full list of National Grid Generation power plants

Power plants operated by National Grid Generation LLC

Northport2 technologies	National Grid Generation LLC	Suffolk	1,564	5	1967	Operating
E F Barrett2 technologies	National Grid Generation LLC	Nassau	669.2	13	1956	Operating
HoltsvillePetroleum Liquids	National Grid Generation LLC	Suffolk	567	10	1974	Operating
Port Jefferson3 technologies	National Grid Generation LLC	Suffolk	498	5	1958	Operating
Wading RiverPetroleum Liquids	National Grid Generation LLC	Suffolk	238.5	3	1989	Operating
Glenwood Landing2 technologies	National Grid Generation LLC	Nassau	122	3	1967	Operating
GlenwoodPetroleum Liquids	National Grid Generation LLC	Nassau	110	2	1972	Operating
ShorehamPetroleum Liquids	National Grid Generation LLC	Suffolk	71.5	2	1966	Operating
West BabylonPetroleum Liquids	National Grid Generation LLC	Suffolk	52.4	1	1971	Standby/Backup
East HamptonPetroleum Liquids	National Grid Generation LLC	Suffolk	27.3	4	1962	Operating
SoutholdPetroleum Liquids	National Grid Generation LLC	Suffolk	14	1	1964	Operating
South HamptonPetroleum Liquids	National Grid Generation LLC	Suffolk	11.5	1	1963	Operating

National Grid Generation: FAQ

How many power plants does National Grid Generation operate?: EIA-860M lists 12 operating plants against “National Grid Generation LLC” for 2026-07, totalling 4 GW of nameplate capacity in 1 state.
Is National Grid Generation the owner of these plants?: EIA-860M names one reporting entity per generator. That entity operates the plant on the survey; ownership can sit with a parent, a partnership or a tax-equity structure that the form does not record.
Why are affiliates listed separately?: Because EIA files them separately. Rolling subsidiaries into a parent would need an ownership map EIA-860M does not publish, so this page does not invent one.