Where is RE Tranquillity?

In Fresno County, California (CA). 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 RE Tranquillity?

277 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.

Who owns RE Tranquillity?

EIA-860M names Southern Power Co 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 RE Tranquillity LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Southern Power Co 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 "RE Tranquillity LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is RE Tranquillity still running?

EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.

RE Tranquillity

RE Tranquillity is a 277 MW solar farm in Fresno County, California, operated by Southern Power Co. EIA-860M lists 3 generating units here, inside CAISO. Its units entered service between 2016 and 2022.

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: 277.3 MW; 272 MW net summer
Generating units: 3
In service: 2016–2022
EIA plant ID: 59939

Where it is

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County: Fresno County, California
Coordinates: 36.5814, -120.4045
Balancing authority: CISO
Sector: IPP Non-CHP

Units, technology and status

Operator of record: Southern Power Co
Primary energy source: Solar
Technologies: Batteries, Solar Photovoltaic
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Solar 205 MW, Battery 72 MW. It is filed here under Solar, the source with the most capacity.

Every plant Southern Power Co reports to EIA →

RE Tranquillity: FAQ

Where is RE Tranquillity?: In Fresno County, California (CA). 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 RE Tranquillity?: 277 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns RE Tranquillity?: EIA-860M names Southern Power Co 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 RE Tranquillity LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Southern Power Co 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 "RE Tranquillity LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is RE Tranquillity still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.