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33 MW Hydro operating in Hampden, MA
33 MW
Nameplate Capacity
3
Generators
units
Conventional Hydroelectric
Technology
1930
Operating Since
Coordinates
42.1171, -72.8646
County
Hampden, MA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | City of Holyoke Gas and Elec Dept - (MA) | — | — |
| Owner(s) | Springfield Water & Sewer Comm | — | — |
| Status | Operating | — | — |
Cobble Mountain is a 33 MW hydroelectric power plant located in Hampden County, Massachusetts. The plant began operating in 1930 and consists of three generators utilizing conventional hydroelectric technology. It is owned and operated by the City of Holyoke Gas and Electric Department. Cobble Mountain is connected to the ISO New England Inc. balancing authority and is within the Northeast Power Coordinating Council (NPCC) NERC region.
The plant's primary fuel source is water (WAT). In the most recent year with available data, Cobble Mountain generated 7,825 MWh of electricity, resulting in a capacity factor of 2.7%. Cobble Mountain is ranked as the 5th largest of 31 power plants in Massachusetts and 390th out of 1464 plants nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
ISO New England Inc. (ISNE)
Grid Voltage
69.0 kV
Regulatory Status
RE — Regulated
Entity Type
Municipal
Sector
Electric Utility
Historic generation and capacity factor for this asset — the foundation for forward forecasts on the InfraSure platform.
570 MWh
Latest Month
7.8K MWh
Annual Generation
2.7%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $75.7M
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Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.COBBLEMT69 COBB
Pricing Hub
.H.INTERNAL_HUB
Location Type
NETWORK NODE
Node Source
Curated node match
Last updated 2026-03-26
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