United States › Power plants › Battery storage › Maine
BATTERY STORAGESouth Portland ESS, LLC
South Portland ESS, LLC is a 10.0 MW approved battery storage site in Cumberland County, Maine, operated by South Portland ESS, LLC.
Plant statusConsented
- Planning (completed)
- Consented (current stage)
- Construction (not yet reached)
- OperatingTarget Dec 2027 (not yet reached)
- Closed (not yet reached)
Planned start of operation reported to EIA: Dec 2027.
Generators
Each generating unit EIA lists at this plant.
| Unit | Technology | Capacity | Status |
|---|---|---|---|
| 1 | Batteries | 10 MW | Approved, construction not started |
Plant details
- Operator
- South Portland ESS, LLC
- Location
- Cumberland County, Maine
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
- Capacity
- Approved: 10.0 MW
- EIA plant ID
- 64616
Location
43.6229, -70.3310
Nearby power plants
- Regional Waste SystemsBioenergy plants · 13.3 MW · 2.3 mi
- LarsonSolar farms · 5.0 MW · 2.6 mi
- Westbrook Energy Center Power PlantGas power plants · 564 MW · 3.2 mi
- BWC Beech Ridge Brook, LLCSolar farms · 5.0 MW · 3.9 mi
- Cape Gas TurbineOil-fired power plants · 35.0 MW · 4.1 mi
- MEVS WaterhouseSolar farms · 2.0 MW · 4.2 mi
- S D Warren WestbrookHydroelectric plants · 7.2 MW · 4.4 mi
- Gorham Solar 1 (CSG)Solar farms · 5.0 MW · 4.7 mi
- Cross Town Energy StorageBattery storage · 175 MW · 5.3 mi
- Cataract HydroHydroelectric plants · 6.6 MW · 10.5 mi
Source: U.S. Energy Information Administration, Form EIA-860M, September 2026. Planned dates are targets reported by the developer and often change. Report a problem