In Garfield County, Colorado (CO). 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 Mamm Creek?

22 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.

EIA-860M names AES Clean Energy 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 Mamm Creek LLC?

Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — AES Clean Energy 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 "Mamm Creek LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.

Is Mamm Creek still running?

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

Mamm Creek

Mamm Creek is a 22 MW battery storage project in Garfield County, Colorado, operated by AES Clean Energy. EIA-860M lists 2 generating units here. Its units 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: 22.4 MW; 26.3 MW net summer
Generating units: 2
In service: 2025
EIA plant ID: 67322

Where it is

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County: Garfield County, Colorado
Coordinates: 39.5266, -107.698
Balancing authority: PSCO
Sector: IPP Non-CHP

Units, technology and status

Operator of record: AES Clean Energy
Primary energy source: Battery
Technologies: Batteries, Solar Photovoltaic
Status: Operating

This site runs on more than one energy source. EIA-860M capacity splits: Battery 11 MW, Solar 11 MW. It is filed here under Battery, the source with the most capacity.

Every plant AES Clean Energy reports to EIA →

Mamm Creek: FAQ

Where is Mamm Creek?: In Garfield County, Colorado (CO). 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 Mamm Creek?: 22 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
Who owns Mamm Creek?: EIA-860M names AES Clean Energy 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 Mamm Creek LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — AES Clean Energy 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 "Mamm Creek LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Mamm Creek still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.