PERRYMAN

How PERRYMAN compares

With 404 MW of capacity, PERRYMAN ranks 8th among the 48 operating power plants Bywatts maps in Maryland and 2nd of the 7 operating Natural Gas plants in the state. It accounts for about 26% of Maryland's operating Natural Gas capacity and 3.8% of all operating capacity in the state. Nationally it is the 376th-largest of the 1,185 operating Natural Gas plants in the database. Commissioned in 1972, it is older than 76% of the 46 operating Maryland plants with a recorded commissioning year. Its operator, CONSTELLATION POWER SOURCE GEN, runs 2 operating plants in Maryland totaling 487 MW. It shares Harford County with 2 other operating plants, CONOWINGO and MCCORMICK & CO. INC. AT BELCAMP.

EIA-860 lists 5 generators at the site with 492 MW of nameplate capacity, mainly natural gas fired combustion turbine technology (this page's HIFLD capacity figure is 404 MW). Net generation was 152 GWh in 2024 (a 3.5% capacity factor), down 54% from 2022. Its generators came online between 1972 and 2015.

Grid neighborhood

The nearest named substation is PEACH BOTTOM (500 kV), about 22.2 miles away; the closest transmission line found within 10 miles is a 115 kV line owned by BALTIMORE GAS & ELECTRIC CO, under 0.1 miles away. Another 15 operating power plants totaling 6,786 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 Lumen Baltimore in Baltimore, about 23.7 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