Power Plants in Ohio

Ohio's power sector in numbers

Bywatts maps 102 operating power plants with 21.7 GW of nameplate capacity in Ohio. Natural Gas leads with 44% of that capacity across 25 plants, followed by Coal (34%) and Nuclear (10%). The inventory also includes 47 plants (12.5 GW) that EIA-860 lists as retired, 3 partly retired with no operable units of their recorded fuel and 3 never built; the largest retired plant is FIRSTENERGY W H SAMMIS (2,468 MW, retired 2023).

The largest operating plants are GENERAL JAMES M GAVIN (2,600 MW, Coal, OHIO POWER CO), CARDINAL (1,880 MW, Coal, CARDINAL OPERATING CO) and MIAMI FORT (1,344 MW, Coal, DUKE ENERGY OHIO INC).

Of the 99 operating plants with a recorded commissioning year, 54 came online in 2000 or later and 21 in 2010 or later; the busiest decade for new capacity was the 2000s (7.1 GW).

The largest operators by operating capacity are OHIO POWER CO (4 plants, 4.1 GW), FIRSTENERGY NUCLEAR OPERATING COMPANY (2 plants, 2.2 GW) and DUKE ENERGY COMMERCIAL ASSET MANAGEMENT (3 plants, 2.2 GW).

Retail electricity sales in Ohio reached 161.9 TWh in 2025, up 8.5% over ten years and up 5.4% year on year; residential customers took 33.3% of it. The average retail price across all sectors was 12.43 cents per kWh, up 24.6% since 2015.

The database also maps 14 named substations (13 of the 13 with a recorded voltage are rated 345 kV or above), 11 data centers (operators include CyrusOne, DataCenter.BZ and Cincinnatti Bell), 177 solar installers and 77 solar companies in Ohio.

Operating capacity by fuel

Retail electricity sales

Sources: HIFLD power-plant inventory (capacity, fuel, operator), EIA-860 (commissioning year, retirements, operable capacity), EIA retail sales and revenue series through January 2026. Counts are of plants Bywatts lists, not every generator in the state.