SP-231 Clifton
SP-231 Clifton is a 5 MW solar farm in Penobscot County, Maine, operated by Madison Energy Investments LLC. EIA-860M lists 1 generating unit here, inside ISO New England. Its unit entered service in 2024.
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
- 4.9 MW
- 4.9 MW net summer
- Generating units
- 1
- In service
- 2024
- EIA plant ID
- 69074
Where it is
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- County
- Penobscot County, Maine
- Coordinates
- 44.7942, -68.5647
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Madison Energy Investments LLC
- Primary energy source
- Solar
- Technologies
- Solar Photovoltaic
- Status
- Operating
SP-231 Clifton: FAQ
- Where is SP-231 Clifton?
- In Penobscot County, Maine (ME). 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 SP-231 Clifton?
- 5 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns SP-231 Clifton?
- EIA-860M names Madison Energy Investments 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 SP-231 Clifton LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Madison Energy Investments 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 "SP-231 Clifton LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is SP-231 Clifton still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.