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530.8 MW Hydro operating in Harford, MD
530.8 MW
Nameplate Capacity
11
Generators
units
Conventional Hydroelectric
Technology
1928
Operating Since
Coordinates
39.6572, -76.1752
County
Harford, MD
Nearby Plants
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Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Constellation Power, Inc | Constellation Energy | — |
| Owner(s) | Constellation Power, Inc | Constellation Energy | — |
| Status | Operating | operating | — |
The Conowingo Dam is a large hydroelectric dam in the lower Susquehanna River near the town of Conowingo, Maryland. The medium-height, masonry gravity dam is one of the largest non-federal hydroelectric dams in the U.S., and the largest dam in the state of Maryland. The dam sits about 9.9 miles (16 km) from the river mouth at Chesapeake Bay, 5 miles (8 km) south of the Pennsylvania border and 45 miles (72 km) northeast of Baltimore, on the border between Cecil and Harford counties. The dam is privately owned by the Susquehanna Electric Company, a subsidiary of Constellation Energy.
Read more on WikipediaConowingo is a 530.8 MW hydroelectric power plant located in Harford County, Maryland. It began operating in 1928 and utilizes conventional hydroelectric technology. The plant is owned by Constellation Energy and operated by Constellation Power, Inc. It consists of 11 generators and uses water (WAT) as its primary fuel source.
In the most recent year with available data, Conowingo generated 1,548,934 MWh of electricity, achieving a capacity factor of 33.3%. The plant is the largest of its kind in Maryland and ranks 47th out of 194 hydroelectric facilities nationally. The plant's balancing authority is PJM Interconnection, LLC, and it resides within the RFC NERC region.
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
220.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
83.5K MWh
Latest Month
1.5M MWh
Annual Generation
33.3%
Capacity Factor
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $1.2B
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Point of Interconnection
Nearest Substation
Conowingo
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
PJM
LMP Node
CONOWING13 KV G10
Pricing Hub
WESTERN HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-04-09
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Maryland and Constellation Energy reach $340M environmental agreement tied to a new 50-year FERC operating license for Conowingo Dam, covering sediment and water-quality mitigation in the Chesapeake Bay watershed.
sourceConstellation Energy commits $340M for water-quality improvements and pollution mitigation at Conowingo Dam over the 50-year license term, per agreement with the State of Maryland.
sourceParent Constellation Energy Corporation completes acquisition of Calpine Corporation — a parent-level corporate action expanding the ultimate beneficial owner's portfolio; not Conowingo-specific.
source