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Oneta Energy Center

Natural gas power plant · Wagoner County, Oklahoma

Nameplate capacity

1,214 MW

Rank in Oklahoma

of 147 plants

In service since

2002

July 2002

Details

Primary fuel: Natural gas
Technology: Natural Gas Fired Combined Cycle
Operator: Oneta Power LLC
County: Wagoner County
Generating units: 6
Share of state capacity: 3.34%
Rank among natural gas plants in Oklahoma: #6 of 33
EIA plant code: 55225

Generating units

Individual generating units at Oneta Energy Center
Unit	Technology	Nameplate	Summer	Online	Status
STG1	Natural Gas Fired Combined Cycle	255 MW	245 MW	2002	Operating
STG2	Natural Gas Fired Combined Cycle	255 MW	245 MW	2003	Operating
CTG1	Natural Gas Fired Combined Cycle	176 MW	149 MW	2002	Operating
CTG2	Natural Gas Fired Combined Cycle	176 MW	149 MW	2002	Operating
CTG3	Natural Gas Fired Combined Cycle	176 MW	149 MW	2003	Operating
CTG4	Natural Gas Fired Combined Cycle	176 MW	149 MW	2003	Operating

Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.

Similarly sized plants in Oklahoma

Redbud Power Plant	Natural gas	1,434 MW
Kiamichi Energy Facility	Natural gas	1,370 MW
GREC	Coal	1,194 MW
Sooner	Coal	1,138 MW

About this data

From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 1,214 MW solar plant and a 1,214 MW nuclear plant have the same entry here and produce very different amounts of electricity.

“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Oklahoma power plants · What Oklahoma actually generates