Perryman
Natural gas and oil power plant in Harford County, Maryland. 492.3 MW of nameplate capacity across 5 generators, operated by Constellation Power Source Generation, LLC.
Also known as Perryman Generating Station · EIA plant 1556
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 492.3 MWNatural gas 333.0 · Oil 159.3
- Generators
- 5 operatingEIA-860M, August 2026
- Operating since
- January 1972First generator online
- Operator
- Constellation Power Source Generation, LLCEIA operator ID 4161
- Grid
- PJMBalancing authority PJM
- Price nodes
- 5 PJM nodesResource nodes with prices
- Location
- Harford County, MD39.4428, −76.2218
- EIA plant ID
- 1556EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Perryman produces
Free · EIA-923Net generation, 2025
251 GWh
250,760 MWh, final
Capacity factor, 2025
5.8%
2024: 3.5%
January to July 2026
270 GWh
Provisional
Range, 2015 to 2025
152.4–552.8
GWh a year. Low 2024, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 151,253 | Not reported | 12 of 12 |
| 2001 | 301,949 | Not reported | 12 of 12 |
| 2002 | 181,420 | Not reported | 12 of 12 |
| 2003 | 105,097 | Not reported | 11 of 12 |
| 2004 | 137,983 | Not reported | 12 of 12 |
| 2005 | 127,437 | Not reported | 12 of 12 |
| 2006 | 72,169 | Not reported | 12 of 12 |
| 2007 | 53,999 | Not reported | 12 of 12 |
| 2008 | 74,676 | Not reported | 12 of 12 |
| 2009 | 55,496 | Not reported | 12 of 12 |
| 2010 | 69,464 | 2.0% | 12 of 12 |
| 2011 | 66,101 | 1.9% | 12 of 12 |
| 2012 | 101,963 | 2.9% | 12 of 12 |
| 2013 | 93,287 | 2.6% | 12 of 12 |
| 2014 | 116,870 | 3.3% | 12 of 12 |
| 2015 | 430,179 | Not reported | 12 of 12 |
| 2016 | 552,786 | Not reported | 12 of 12 |
| 2017 | 228,436 | 5.3% | 12 of 12 |
| 2018 | 270,954 | 6.8% | 11 of 12 |
| 2019 | 203,102 | 4.7% | 12 of 12 |
| 2020 | 193,547 | 4.9% | 11 of 12 |
| 2021 | 239,936 | 5.6% | 12 of 12 |
| 2022 | 329,794 | 7.6% | 12 of 12 |
| 2023 | 246,864 | 5.7% | 12 of 12 |
| 2024 | 152,386 | 3.5% | 12 of 12 |
| 2025 | 250,760 | 5.8% | 12 of 12 |
| 2026 (provisional, partial year) | 270,312 | 10.8% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · PJMEmissions
Free · EPA CAMPDCO₂, 2025
178,570
US short tons. 2024: Not reported
SO₂, 2025
1
US short tons
NOx, 2025
138
US short tons
CO₂ per MWh, calculated
0.71 t
About 1,424 lb per MWh
6 of 6 EPA units reported CO₂ in 2025 (**51, 6-1, 6-2, CT1, CT2, CT3, CT4), matched to EIA plant 1556 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| GT1 | Petroleum Liquids | 53.1 | January 1972 |
| GT3 | Petroleum Liquids | 53.1 | April 1972 |
| GT4 | Petroleum Liquids | 53.1 | April 1972 |
| GT5 | Natural Gas Fired Combustion Turbine | 192.0 | June 1995 |
| GT6 | Natural Gas Fired Combustion Turbine | 141.0 | June 2015 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Constellation Power Source Generation, LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near Perryman
More plants operated by Constellation Power Source Generation, LLC
Questions about Perryman
How much power does Perryman produce?
Perryman reported 250,760 MWh (251 GWh) of net generation in 2025, a 5.8% capacity factor on 492.3 MW of nameplate capacity. From January to July 2026 it reported 270 GWh, which is provisional.
Where is Perryman?
Perryman is in Harford County, Maryland, at 39.4428, −76.2218. It is in the PJM Interconnection, LLC balancing area (PJM).
Who operates Perryman?
EIA-860M for August 2026 lists Constellation Power Source Generation, LLC as the operator (EIA operator ID 4161). The operator is not always the owner.
Is Perryman a natural gas or a oil plant?
Both. Natural gas capacity totals 333 MW and oil capacity totals 159.3 MW.
When did Perryman start operating?
Its first generator began operating in January 1972, according to EIA-860M.
Does InfraMap have power prices for Perryman?
Yes. InfraMap has PJM day-ahead and real-time prices at 5 price nodes linked to Perryman, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- PJM day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page