Limestone — United States of America

Limestone is a 1,849.8 MW coal power station in Texas, United States of America. It is operated by NRG Texas Power LLC. Based on reported annual generation of 8,700 GWh, it can supply roughly 2.5 million homes. It ranks #211 of 10,884 United States of America power plants by installed capacity. Commissioned in 1986, it is around 40 years old — long-established. In context, coal supplies about 16.3% 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 USA0000298.

Data provenance

Source of the capacity and fuel values:

capacity: GEM · 2026 · L100000104203; fuel: WRI GPPD

In context: how this plant compares

At 1,849.8 MW, Limestone is well above the median coal plant in United States of America (558 MW). Coal plants burn pulverised coal to raise high-pressure steam for a turbine; they run as baseload but are the most carbon-intensive mainstream source and the first targeted for retirement or efficiency retrofits.

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

Key facts

Load factor

54%, from 8,700 GWh of reported generation; the median for 244 coal plants in United States of America that report generation is 41%

Generation trend

12,872 GWh in 2013 and 8,700 GWh in 2019 (−32%)

Highest and lowest year

2013: 12,872 GWh; 2019: 8,700 GWh

Share of United States of America coal capacity

0.3% of 621,194 MW across 802 plants in this dataset

Age among peers

561 of 745 dated coal 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 NRG Texas Power LLC.

Local climate & thermal context

This coal plant burns coal to raise high-pressure steam that spins a turbine-generator. It sits in a humid subtropical climate (Köppen Cfa) — Northern Hemisphere, latitude 31.4°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 61% 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: 26/100 — this site sits in the bottom third of the power plants we cover by heating degree-days.

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 #76 largest coal power plant of 802 in United States of America by capacity.

United States of America has 802 coal power plants in this dataset, together about 621,194 MW of capacity.

Nearby power plants

• Limestone Generating Station · Coal · 2,595 MW · Texas
• NRG Jewett Energy Center · Gas · 2,356 MW · Texas
• Oak Grove (TX) · Coal · 1,795.4 MW · Texas
• Oak Grove Plant · Coal · 1,795.4 MW · Texas
• Big Brown Steam Electric Station · Coal · 1,186.8 MW · Texas
• Freestone Energy Center · Gas · 1,036 MW · Texas

Location

Coordinates 31.4219, -96.2525 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions