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492.3 MW Natural Gas Fired Combustion Turbine (333 MW) + Petroleum Liquids (159 MW) operating in Harford, MD — PJM Interconnection, LLC
492.3 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Petroleum Liquids
1972
Operating Since
Coordinates
39.4428, -76.2218
County
Harford, MD
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Constellation Power Source Generation, LLC | Constellation Power Source Generation | — |
| Owner(s) | Constellation Power Source Generation, LLC | Constellation Energy | — |
| Status | Operating | — | — |
The Perryman Generating Station is a 353 MW electric generating peaking power plant owned by Constellation Energy, located near Aberdeen, Maryland. Perryman has five units; four are oil-fired, and one is natural gas-fired.
Read more on WikipediaThe Perryman power plant is located in Harford County, Maryland. It is owned by Constellation Energy and operated by Constellation Power Source Generation, LLC. The plant has a total capacity of 492.3 MW across 5 generators and primarily uses distillate fuel oil (DFO), but also utilizes natural gas. Perryman began operating in 1972 and is considered a hybrid plant due to its use of multiple fuel sources.
In the most recent year with available data, Perryman generated 250,760 MWh of electricity, resulting in a capacity factor of 5.8%. The plant operates within the PJM Interconnection, LLC balancing authority and the RFC NERC region. Perryman is ranked as the 2nd largest of 4 similar plants in Maryland, and 24th out of 60 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
PJM
Market
ISO/RTO Member
NERC Region
RFC
Balancing Authority
PJM Interconnection, LLC (PJM)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
16.2K MWh
Latest Month
250.8K MWh
Annual Generation
5.8%
Capacity Factor
CO₂ Intensity
1363 lb/MWh
NOx
0.527 lb/MWh
SO₂
0.007 lb/MWh
CH₄
0.026 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
5.7%
Annual Net Gen
247 GWh
CO₂eq
1364 lb/MWh
Subregion
RFC East
2013
$765/kW
Est. Construction Cost
Total estimated cost: $376.4M
Market Position
ISO/RTO Market
PJM
LMP Node
PERRYMAN33 KVCT 51
Pricing Hub
WESTERN HUB
Alt. Hub / Zone
DOMINION HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-03-14
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