Stony Brook

Stony Brook — 538 MW hybrid plant, Hampden County, MA · Ask the Grid

Generation and physical site

EIA plant 6081 · Inventory for Aug 2026.

Reported operating nameplate by technology

Petroleum: 275.6 MW
Solar: 6.9 MW
Natural gas: 255 MW

Operating generators only. Battery power is in MW; stored energy is in MWh. These ratings do not establish a shared export limit.

Generator records (12)

EIA generator status and nameplate capacity for Stony Brook
Generator	Technology	Status	Power (MW)	Energy (MWh)
1	Petroleum Liquids	Operating	85	Unknown
2	Petroleum Liquids	Operating	85	Unknown
5051S	Solar Photovoltaic	Operating	6.9	Unknown
BS#1	Petroleum Liquids	Standby	2	Unknown
BS#2	Petroleum Liquids	Standby	2	Unknown
CA1	Petroleum Liquids	Operating	105	Unknown
CT1	Natural Gas Fired Combined Cycle	Operating	85	Unknown
CT2	Natural Gas Fired Combined Cycle	Operating	85	Unknown
CT3	Natural Gas Fired Combined Cycle	Operating	85	Unknown
EDSI	Petroleum Liquids	Operating	0.6	Unknown
3A	Natural Gas Fired Combined Cycle	canceled_or_postponed	302	Unknown
CT4	Petroleum Liquids	canceled_or_postponed	120	Unknown

Physical map location · OpenStreetMap: 42.19887, -72.51082
Filed location · EIA: 42.19780, -72.51060

Sources and observation dates

Inventory source: EIA-860M workbook (preliminary)
EIA reporting month: Aug 2026
EIA retrieved: Oct 10, 2026
OSM extract: Oct 9, 2026
OSM last mapped edit: Apr 6, 2024
Map prepared: Oct 10, 2026
Field verification: Not reported

Reporting month describes the inventory. Retrieval and map preparation describe processing; an OSM edit does not establish an in-service date.

EIA source inventory

Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
1	85 MW 65 MW summer	Petroleum Liquids Disillate Fuel Oil · GT	Nov 1982	Operating
2	85 MW 65 MW summer	Petroleum Liquids Disillate Fuel Oil · GT	Nov 1982	Operating
5051S	6.9 MW 6.9 MW summer	Solar Photovoltaic Solar · PV	Jun 2018	Operating
BS#1	2 MW 2 MW summer	Petroleum Liquids Disillate Fuel Oil · IC	Sep 2007	Standby/Backup: available for service but not normally used
BS#2	2 MW 2 MW summer	Petroleum Liquids Disillate Fuel Oil · IC	Sep 2007	Standby/Backup: available for service but not normally used
CA1	105 MW 96 MW summer	Petroleum Liquids Disillate Fuel Oil · CA	Nov 1981	Operating
CT1	85 MW 69.7 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Nov 1981	Operating
CT2	85 MW 69.7 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Nov 1981	Operating
CT3	85 MW 69.7 MW summer	Natural Gas Fired Combined Cycle Natural Gas · CT	Nov 1981	Operating
EDSI	0.6 MW 0.6 MW summer	Petroleum Liquids Disillate Fuel Oil · IC	Nov 1981	Operating

Related parties and identifiers

Parties, market resources, and identifiers tied to this asset, with owner, operator, developer, EPC, compliance provider, and interconnecting entity roles kept separate.

Parties and identifiers

OrganizationRoleBasis

Reporting portfolio

EIA reporting entity

Massachusetts Mun Wholes Electric Co

Entity 11806

Operating portfolio

6 plants

1 states

Reported capacity

631.1 MW

Batteries · Natural Gas Fired Combined Cycle · Natural Gas Fired Combustion Turbine

Largest reported plants in this portfolio
Largest reported plants	Capacity	State
Stony BrookCurrent	537.5 MW	MA
MMWEC Simple Cycle Gas Turbine	65 MW	MA
Berkshire Wind Power Project	19.6 MW	MA
Ashburnham Energy Storage Project	3 MW	MA
SELCO Community Solar	3 MW	MA
Beebe Substation Battery Storage	3 MW	MA

Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.

View full reporting portfolio

Timeline and sources

Project milestones and public references behind the asset profile.

Project timeline

1981
1981
Intermediate unit entered operationmmwec.org
Massachusetts Municipal Wholesale Electric Company says the intermediate unit entered operation in 1981.
Nov 1981
Nov 1981
Generators enter operationEIA-860
EIA-860 lists generator CA1, generator CT1, generator CT2, generator CT3, generator EDSI with this operating date.
1982
1982
Peaking unit entered operationmmwec.org
Massachusetts Municipal Wholesale Electric Company says the peaking unit entered operation in 1982.
Nov 1982
Nov 1982
Generators enter operationEIA-860
EIA-860 lists generator 1, generator 2 with this operating date.
Sep 2007
Sep 2007
Generators enter operationEIA-860
EIA-860 lists generator BS#1, generator BS#2 with this operating date.
Jun 2018
Jun 2018
Generator enters operationEIA-860
EIA-860 lists generator 5051S with this operating date.

Sources

PublisherReferenceType

U.S. Energy Information AdministrationEIA-860 generator inventoryFederal registry

U.S. Energy Information AdministrationEIA-923 generation filingsFederal filing

eia.goveia.govauthoritative

Common questions about Stony Brook

Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.

How big is Stony Brook?

Stony Brook reports 275.6 MW petroleum + 6.9 MW solar + 255 MW natural gas of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.

What kind of plant is Stony Brook?

Stony Brook is a Natural Gas Fired Combined Cycle facility in Hampden County, MA, participating in the ISO-NE market.

Where is Stony Brook located?

Stony Brook is in Hampden County, MA, inside the ISO-NE balancing area.

Who operates Stony Brook?

Stony Brook is operated by Massachusetts Mun Wholes Electric Co according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.

How much electricity does Stony Brook generate?

Stony Brook reported 133.3 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.

How does Stony Brook compare to other plants?

By capacity, Stony Brook ranks #24 of 726 operating plants of the same technology nationally. It ranks #2 of 16 in MA.

Co-located assets

Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.

Kearsarge Ludlow LLCSolar PhotovoltaicSolar Photovoltaic4 MW1.4 km Ludlow LandfillSolar PhotovoltaicSolar Photovoltaic2 MW1.9 km ChicopeeSolar PhotovoltaicSolar Photovoltaic2 MW2 km Huxley SolarBatteries, Solar PhotovoltaicBatteries, Solar Photovoltaic

Overview

Infrastructure record

Stony Brook

Overview

Infrastructure record

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Structured profile

Generation and physical site

Reported operating nameplate by technology

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Units and generators

Performance

Peer context

Monthly generation

Grid and market context

Nearby substations

Commercial, land, and environmental record

Transactions and agreements