In Lea County, New Mexico (NM). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.

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

EIA-860M names Southwestern Public Service 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 Maddox LLC?

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

Is Maddox still running?

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

Maddox

Maddox is a 212 MW natural gas power plant in Lea County, New Mexico, operated by Southwestern Public Service Co. EIA-860M lists 3 generating units here, inside SPP. Its units entered service between 1963 and 1976.

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: 212 MW; 188 MW net summer
Generating units: 3
In service: 1963–1976
EIA plant ID: 2446

Where it is

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County: Lea County, New Mexico
Coordinates: 32.7142, -103.3015
Balancing authority: SWPP
Sector: Electric Utility

Units, technology and status

Operator of record: Southwestern Public Service Co
Primary energy source: Natural gas
Technologies: Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine
Status: Operating

Every plant Southwestern Public Service Co reports to EIA →

Maddox: FAQ

Where is Maddox?: In Lea County, New Mexico (NM). 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 Maddox?: 212 MW of nameplate capacity across 3 units, as of the EIA-860M release for 2026-07.
Who owns Maddox?: EIA-860M names Southwestern Public Service 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 Maddox LLC?: Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Southwestern Public Service 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 "Maddox LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
Is Maddox still running?: EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.