South River BESS Phase 1
South River BESS Phase 1 is a 10 MW battery storage project in Middlesex County, New Jersey, operated by South River OnSite Generation, LLC. EIA-860M lists 1 generating unit here, inside PJM. Its unit entered service in 2025.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 9.9 MW
- 9.9 MW net summer
- Generating units
- 1
- In service
- 2025
- EIA plant ID
- 70239
Where it is
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- County
- Middlesex County, New Jersey
- Coordinates
- 40.4435, -74.3781
- Balancing authority
- PJM
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- South River OnSite Generation, LLC
- Primary energy source
- Battery
- Technologies
- Batteries
- Status
- Operating
Every plant South River OnSite Generation, LLC reports to EIA →
South River BESS Phase 1: FAQ
- Where is South River BESS Phase 1?
- In Middlesex County, New Jersey (NJ). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is South River BESS Phase 1?
- 10 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns South River BESS Phase 1?
- EIA-860M names South River OnSite Generation, LLC as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as South River BESS Phase 1 LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — South River OnSite Generation, LLC here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "South River BESS Phase 1 LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is South River BESS Phase 1 still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.