Northfield Mountain is a 1.2 GW Hydroelectric Pumped Storage asset in ISO New England, currently Operating.
Northfield Mountain is reported in Massachusetts since 1972 under ENGIE. Available operating and financial measures include -2.8% capacity factor and -285 GWh annual generation; $2294/kW reported CapEx.
- Location
- Franklin, Massachusetts
- Technology
- Hydroelectric Pumped Storage
- Owner / parent
- ENGIE
- Operator
- FirstLight Power Resources, Inc. - MA
- Grid
- ISO New England
- Plant ID
- 547
What stands out
Northfield Mountain is a 1.2 GW Hydroelectric Pumped Storage asset in Massachusetts with status Operating.
Latest annual operating measures report -2.8% capacity factor and -285 GWh annual generation.
Available financial measures include $2294/kW CapEx.
Latest linked story: “Combined Notice of Filings #1” (Federal Register (FERC), 2026-07-29).
Market and operating context
- ISO / market
- ISO New England
- Balancing authority
- ISO New England Inc.
- NERC region
- NPCC
- State rank
- #1 of 32
- National rank
- #14 of 1,462
Why it matters
For this asset in ISO New England, operating status, generation, ownership, and linked events are the primary facts for performance and asset-level diligence. The exact chart and source-linked records below let the reader test those facts before moving to a deeper report.
