W H Zimmer — United States of America

W H Zimmer is a 1,425.6 MW coal power station in Ohio, United States of America. It is operated by Dynegy W H Zimmer. Based on reported annual generation of 3,549 GWh, it can supply roughly 1.0 million homes. It ranks #356 of 10,884 United States of America power plants by installed capacity. Commissioned in 1991, it is around 35 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 USA0006019.

Data provenance

Capacity and fuel are the upstream open-dataset record, not yet matched to a 2026 registry or GEM entry.

capacity: WRI GPPD; fuel: WRI GPPD

In context: how this plant compares

At 1,425.6 MW, W H Zimmer 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

28%, from 3,549 GWh of reported generation; the median for 244 coal plants in United States of America that report generation is 41%

Generation trend

9,362 GWh in 2013 and 3,549 GWh in 2019 (−62%)

Highest and lowest year

2013: 9,362 GWh; 2019: 3,549 GWh

Share of United States of America coal capacity

0.2% of 621,194 MW across 802 plants in this dataset

Age among peers

627 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 Dynegy W H Zimmer.

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 38.9°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 10% above 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: 55/100 — this site sits in the mid 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 mild atmospheric environment (estimated ISO 9223 class C2 — Low), 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 #152 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

• Zimmer nuclear power plant · Nuclear · 1,980 MW · Ohio
• Zimmer Generating Station · Coal · 1,425.6 MW · Ohio
• Meldahl Hydroelectric Project · Hydro · 105 MW · Kentucky
• Beckjord Generating Station · Coal · 1,221.3 MW · Kentucky
• Walter C Beckjord · Storage · 4 MW · Ohio
• Pendleton County LFGTE · Waste · 3.2 MW · Kentucky

Location

Coordinates 38.8675, -84.2289 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.

Frequently asked questions