Green Country Energy LLC — United States of America

Green Country Energy LLC is a 903 MW gas power station in Oklahoma, United States of America. It is operated by Green Country OP Services LLC. Based on reported annual generation of 4,726 GWh, it can supply roughly 1.4 million homes. It ranks #674 of 10,884 United States of America power plants by installed capacity. Commissioned in 2002, it is around 24 years old — relatively modern. Its annual emissions of 1,510,025 t CO₂/yr (US EPA GHGRP) are equivalent to about 352k cars driven for a year. In context, gas supplies about 40.0% of United States of America's electricity; the national grid averages 384 gCO₂/kWh (43.0% low-carbon) (2025).

Plant data: WRI Global Power Plant Database (CC BY 4.0), id USA0055146.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000401991; fuel: WRI GPPD

In context: how this plant compares

At 903 MW, Green Country Energy LLC is well above the median gas plant in United States of America (121.2 MW). Technically it is described as CCGT; combined-cycle with a heat-recovery steam generator (HRSG). Gas plants burn natural gas either in open-cycle turbines for fast peaking, or in combined-cycle units that recover exhaust heat in an HRSG to reach roughly 55–62% efficiency — the cleanest-burning fossil option.

Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.

1,510,025 t CO₂/yr — in everyday terms

This facility's annual emissions are roughly equivalent to:

Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per US EPA GHGRP (measured for US EPA/EU ETS, modelled for Climate TRACE).

Key facts

Load factor

60%, from 4,726 GWh of reported generation; the median for 1622 gas plants in United States of America that report generation is 26%

Generation trend

3,164 GWh in 2013 and 4,726 GWh in 2019 (+49%)

Highest and lowest year

2018: 4,986 GWh; 2014: 3,127 GWh

Share of United States of America gas capacity

0.1% of 789,950 MW across 2,165 plants in this dataset

Age among peers

1,047 of 1,973 dated gas plants in United States of America are older

Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).

Reported generation trend

Annual generation (GWh), WRI Global Power Plant Database (CC BY 4.0).

Owner

Operated by Green Country OP Services LLC.

Local climate & thermal context

This gas plant burns natural gas in a turbine — often in a combined-cycle setup — to generate electricity. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 36.0°N — which shapes how much energy it can produce and how its output varies through the year.

Monthly mean temperature

Heating degree-days here run 25% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.

Climate heat-demand index: 41/100 — this site sits in the mid third of the power plants we cover by heating degree-days.

A gas turbine here also runs ~0% below its ISO (15°C) rating at this annual mean (typical CCGT curve, estimate).

Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.

Site climate & environmental severity

This site sits in a moderately corrosive environment (estimated ISO 9223 class C3 — Medium), with humidity / wetness the leading environmental stress.

Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.

How it compares & nearby plants

The #258 largest gas power plant of 2165 in United States of America by capacity.

United States of America has 2165 gas power plants in this dataset, together about 789,950 MW of capacity.

Nearby power plants

• Riverside (OK) · Gas · 1,120 MW · Oklahoma
• Tulsa · Gas · 340 MW · Oklahoma
• Covanta Tulsa Renewable Energy LLC · Waste · 16.8 MW · Oklahoma
• Oneta Energy Center · Gas · 1,214 MW · Oklahoma
• Tulsa LFG LLC · Waste · 3.2 MW · Oklahoma
• Keystone Dam · Hydro · 70 MW · Oklahoma

Location

Coordinates 35.9833, -95.9346 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions