CONOWINGO

How CONOWINGO compares

With 531 MW of capacity, CONOWINGO ranks 7th among the 48 operating power plants Bywatts maps in Maryland and is the largest of the 2 operating Hydro plants in the state. It accounts for about 96% of Maryland's operating Hydro capacity and 5.0% of all operating capacity in the state. Nationally it is the 43rd-largest of the 1,243 operating Hydro plants in the database. Commissioned in 1928, it is older than 95% of the 46 operating Maryland plants with a recorded commissioning year. It shares Harford County with 2 other operating plants, PERRYMAN and MCCORMICK & CO. INC. AT BELCAMP.

EIA-860 lists 11 generators at the site with 531 MW of nameplate capacity, all conventional hydroelectric technology. Net generation was 1,831 GWh in 2024 (a 39% capacity factor), up 4% from 2022. Its generators came online between 1928 and 1964.

Grid neighborhood

The nearest named substation is PEACH BOTTOM (500 kV), about 9.0 miles away; the closest transmission line found within 10 miles is a 230 kV line owned by DELMARVA POWER, under 0.1 miles away. Another 12 operating power plants totaling 5,676 MW sit within 25 miles; the largest is PEACH BOTTOM (2,319 MW, Nuclear). Within 50 miles are 3 mapped data centers; the nearest is USNAMES-NET in Wilmington, about 29.5 miles away.

Computed by Bywatts from HIFLD power plant, substation and transmission line records, EIA-860/923 survey data and PeeringDB data center locations; distances are straight-line. Sources and methodology