South River BESS Phase 1
Battery storage project in Middlesex County, New Jersey. 9.9 MW of nameplate capacity across 1 generator, operated by South River OnSite Generation, LLC.
Also known as EIA plant 70239
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 9.9 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- January 2025First generator online
- Operator
- South River OnSite Generation, LLCEIA operator ID 67938
- Grid
- PJMBalancing authority PJM
- Price nodes
- None linkedNo verified ISO node
- Location
- Middlesex County, NJ40.4434, −74.3782
- EIA plant ID
- 70239EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power South River BESS Phase 1 produces
Free · EIA-923EIA-923 has no net generation reported for this plant.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| SOUR1 | Batteries | 9.9 | January 2025 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists South River OnSite Generation, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about South River BESS Phase 1
Where is South River BESS Phase 1?
South River BESS Phase 1 is in Middlesex County, New Jersey, at 40.4435, −74.3782. It is in the PJM Interconnection, LLC balancing area (PJM).
Who operates South River BESS Phase 1?
EIA-860M for August 2026 lists South River OnSite Generation, LLC as the operator (EIA operator ID 67938). The operator is not always the owner.
When did South River BESS Phase 1 start operating?
Its first generator began operating in January 2025, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page