Northfield Mountain

OperatingHydro

Ranked #1 of 31 Hydro plants in MA#14 of 1454 nationally

1168 MW Hydro operating in Franklin, MA — ISO New England Inc.

EIAGEMWD

1,168 MW

Nameplate Capacity

Generators

units

Hydroelectric Pumped Storage

Technology

1972

Operating Since

Location

Coordinates

42.6107, -72.4716

County

Franklin, MA

Nearby Plants

NFM Solar Power LLC
Solar1.9 MW · 0.3 km
Erving CSG
Solar1 MW · 0.8 km
French King Solar LLC
Solar5 MW · 2.3 km

Ownership & Operator

Field	EIA	GEM	Wikidata
Operator	FirstLight Power Resources, Inc. - MA	Firstlight Power Resources	—
Owner(s)	FirstLight Power Resources, Inc. - MA	ENGIE	FirstLight Power Resources
Status	Operating	operating	—

Ownership Chain

About

Northfield Mountain is a pumped-storage hydroelectric plant and reservoir located on and under the similarly named Northfield Mountain in Erving and Northfield, Massachusetts. It is currently owned by FirstLight Power Resources, which purchased the facility from Northeast Utilities in 2006.

Read more on Wikipedia

Northfield Mountain is a 1,168 MW pumped-storage hydroelectric power plant located in Franklin County, Massachusetts. The plant began operating in 1972 and utilizes water as its primary fuel source. It is owned by ENGIE, a French multinational utility, and operated by FirstLight Power Resources, Inc. The facility houses four generators using hydroelectric pumped storage technology.

Northfield Mountain is the largest of two pumped storage plants in Massachusetts and ranks as the 14th largest of 194 such facilities nationally. The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.

Generated from EIA, GEM, and public data sources

Wikipedia EIA Plant Profile Wikidata Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

NPCC

Balancing Authority

ISO New England Inc.

Grid Voltage

345 kV

Regulatory Status

Entity Type

Independent Power Producer

Sector

IPP Non-CHP

Generation

−30.5K MWh

Net Charging

-284.6K MWh

Annual Net Energy

-2.8%

Capacity Factor

Jan 2023 – Dec 2025

Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.

Financial Data

No financial data available for this plant.

Pricing & Market Data

HIGH confidence

Point of Interconnection

Nearest Substation

Northfield Substation · 345 kV

Substation Distance

< 10 km

Operator

Eversource

Coord Source