Cobble Mountain

Old Granville Road, Granville, MA 1034

Plant Summary Information

Cobble Mountain is ranked #15 out of 25 hydroelectric power plants in Massachusetts in terms of total annual net electricity generation.

Cobble Mountain is comprised of 3 generators and generated 1.5 GWh during the 3-month period between September 2025 to December 2025.

Plant Name	Cobble Mountain
Utility Name	City of Holyoke Gas and Elec Dept - (MA)
Location	Hampden County, MA
Initial Operation Date	January 1930
Last Update	Dec 2025
Annual Generation	7.1 GWh
Annual Consumption	26.0 k MMBtu
Ranked #7,375 out of 13,081 Power Plants Nationwide
Ranked #990 out of 1,311 Water Power Plants Nationwide
Ranked #132 out of 648 Massachusetts Power Plants
Ranked #15 out of 25 Massachusetts Water Power Plants
Fuel Types	Water
Previous Operator	City of Holyoke Gas and Electric Dept. (2013 to 2024) City of Holyoke Gas and Elec Dept - (MA) (2025 to 2025)

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Summary Information
Plant Name	Cobble Mountain (1630)
Plant Address	Old Granville Road, Granville, MA 1034
Utility	City of Holyoke Gas and Elec Dept - (MA) (8776)
Latitude, Longitude	42.11711, -72.86466
Generation Dates on File	Jan 2001 to Dec 2025
Initial Operation Date	January 1930
Annual Generation	7.1 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	NPCC
Balancing Authority	ISO New England Inc. (ISNE)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Cobble Mountain Reservoir
Ash Impoundment	No
Transmission / Distribution Owner	Western Massachusetts Electric Company (20455) MA
Grid Voltage	69.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	13 MW
Nameplate Power Factor	0.8
Summer Capacity	12.9 MW
Winter Capacity	13 MW
Minimum Load	3 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	January 1930
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Time From Cold Shutdown To Full Load	10M

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	7 MW
Nameplate Power Factor	0.8
Summer Capacity	6.8 MW
Winter Capacity	6.9 MW
Minimum Load	1 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	January 1930
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Time From Cold Shutdown To Full Load	10M

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Wholly Owned by Other Entity
Nameplate Capacity	13 MW
Nameplate Power Factor	0.8
Summer Capacity	12.9 MW
Winter Capacity	13 MW
Minimum Load	3 MW

Uprate/Derate Completed	No
Status	Operating
First Operation Date	January 1930
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Time From Cold Shutdown To Full Load	10M

Owner Name	Address	Generator	Ownership
Springfield Water & Sewer Comm	P O Box 995, Springfield, MA 1101	Generator 1	100.00%
Springfield Water & Sewer Comm	P O Box 995, Springfield, MA 1101	Generator 2	100.00%
Springfield Water & Sewer Comm	P O Box 995, Springfield, MA 1101	Generator 3	100.00%

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#980	Boulder City Lakewood Hydro	Boulder, CO	7.5 GWh
#981	Boulder City Betasso Hydro Plant	Boulder, CO	7.5 GWh
#982	Quail Creek Hydro Plant #1	Hurricane, UT	7.4 GWh
#983	Rapids Energy Center	Grand Rapids, MN	40.4 GWh
#984	Whitman	Ketchikan, AK	7.3 GWh
#985	Redlands Water & Power	Grand Junction, CO	7.3 GWh
#986	Rhinelander Mill	Rhinelander, WI	7.3 GWh
#987	Seneca Falls Hydroelectric Project	Seneca Falls, NY	7.3 GWh
#988	LAC Courte Oreilles Hydroelect	Winter, WI	7.2 GWh
#989	Clement Dam Hydro LLC	Tilton, NH	7.1 GWh
#991	Mission	Murphy, NC	7.0 GWh
#992	Copenhagen Plant	Copenhagen, NY	7.0 GWh
#993	Oswegatchie	Edwards, NY	7.0 GWh
#994	Sibley Mill	Augusta, GA	7.0 GWh
#995	Schuylerville	Schuylerville, NY	7.0 GWh
#996	Dexter Plant	Dexter, NY	6.9 GWh
#997	Chester Diversion Hydroelectric Project	Chester, ID	6.9 GWh
#998	Peters Drive Plant	Hood River, OR	6.9 GWh
#999	Hydraulic Race	Lockport, NY	6.9 GWh
#1000	Twin Reservoirs	Walla Walla, WA	6.9 GWh

Below are closest 20 power plants surrounding Cobble Mountain.

Plant Name	Plant Location	Annual Generation	Distance
CED Westfield Solar, LLC	Westfield, MA	2.7 GWh	6.9 mi
CES Agawam Tuckahoe Solar Hybrid	Agawam, MA	6.7 GWh	9.8 mi
Goose Pond Solar	Southwick, MA	7.0 GWh	8.7 mi
GSPP Terrawatt Westfield LLC CSG	Westfield, MA	6.0 GWh	8.2 mi
Holiday Hill Community Wind	Russell, MA	11.6 GWh	6.6 mi
Holyoke Solar Cooperative at Mueller	Holyoke, MA	3.8 GWh	10.6 mi
Indian River Hydro	Russell, MA	1.8 GWh	4.9 mi
International Paper Woronoco Mill	Woronoco, MA	6.6 GWh	3.7 mi
Kearsarge Southwick LLC	Southwick, MA	4.7 GWh	8.3 mi
Route 57 Solar	Agawam, MA	2.2 GWh	11 mi
Russell (MA)	Russell, MA	5.0 GWh	3.4 mi
Southampton Solar PV	Southampton, MA	2.6 GWh	9.8 mi
Southwick Solar PV	Southwick, MA	7.9 GWh	7.5 mi
Southwick Solar, LLC Community Solar	Southwick, MA	3.5 GWh	7 mi
Sunpin Blandford	Southwick, MA	6.3 GWh	9.1 mi
Syncarpha Blandford Hybrid CSG	Blandford, MA	7.9 GWh	7.6 mi
Texon Hydroelectric Project	Russell, MA	3.9 GWh	7.2 mi
Tolland	Tolland, MA	8.3 GWh	7.8 mi
Tolland Solar NG LLC	Tolland, MA	4.6 GWh	10.3 mi
Twiss Street Solar	Westfield, MA	1.9 GWh	6.4 mi