Conowingo
Hydro power plant in Harford County, Maryland. 530.8 MW of nameplate capacity across 11 generators, operated by Constellation Power, Inc.
Also known as Conowingo Hydroelectric Station · EIA plant 1574
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 530.8 MWNameplate
- Generators
- 11 operatingEIA-860M, August 2026
- Operating since
- March 1928First generator online
- Operator
- Constellation Power, IncEIA operator ID 6035
- Grid
- PJMBalancing authority PJM
- Price nodes
- 11 PJM nodesResource nodes with prices
- Location
- Harford County, MD39.6572, −76.1752
- EIA plant ID
- 1574EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Conowingo produces
Free · EIA-923Net generation, 2025
1.55 TWh
1,548,934 MWh, final
Capacity factor, 2025
33.3%
2024: 39.3%
January to July 2026
1.08 TWh
Provisional
Range, 2015 to 2025
1.4–2.8
TWh a year. Low 2016, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 1,713,984 | Not reported | 12 of 12 |
| 2001 | 1,165,233 | Not reported | 12 of 12 |
| 2002 | 1,638,114 | Not reported | 12 of 12 |
| 2003 | 2,598,021 | Not reported | 12 of 12 |
| 2004 | 2,474,017 | Not reported | 12 of 12 |
| 2005 | 1,689,863 | Not reported | 12 of 12 |
| 2006 | 2,086,191 | Not reported | 12 of 12 |
| 2007 | 1,629,690 | Not reported | 12 of 12 |
| 2008 | 1,908,046 | Not reported | 12 of 12 |
| 2009 | 1,867,012 | Not reported | 12 of 12 |
| 2010 | 1,645,359 | 37.1% | 12 of 12 |
| 2011 | 2,518,452 | Not reported | 12 of 12 |
| 2012 | 1,639,132 | 35.2% | 12 of 12 |
| 2013 | 1,699,398 | 36.5% | 12 of 12 |
| 2014 | 1,594,647 | 34.3% | 12 of 12 |
| 2015 | 1,597,488 | 34.4% | 12 of 12 |
| 2016 | 1,369,003 | 29.4% | 12 of 12 |
| 2017 | 1,935,422 | 41.6% | 12 of 12 |
| 2018 | 2,788,408 | 60.0% | 12 of 12 |
| 2019 | 2,161,865 | 46.5% | 12 of 12 |
| 2020 | 1,673,169 | 35.9% | 12 of 12 |
| 2021 | 2,097,157 | 45.1% | 12 of 12 |
| 2022 | 1,756,565 | 37.8% | 12 of 12 |
| 2023 | 1,829,381 | 39.3% | 12 of 12 |
| 2024 | 1,831,180 | 39.3% | 12 of 12 |
| 2025 | 1,548,934 | 33.3% | 12 of 12 |
| 2026 (provisional, partial year) | 1,083,578 | 40.1% | 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 CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 45.0 | March 1928 |
| 2 | Conventional Hydroelectric | 36.0 | March 1928 |
| 3 | Conventional Hydroelectric | 48.0 | March 1928 |
| 4 | Conventional Hydroelectric | 47.7 | April 1928 |
| 5 | Conventional Hydroelectric | 36.0 | June 1928 |
| 6 | Conventional Hydroelectric | 47.7 | July 1928 |
| 7 | Conventional Hydroelectric | 48.0 | June 1928 |
| 8 | Conventional Hydroelectric | 55.6 | March 1964 |
| 9 | Conventional Hydroelectric | 55.6 | March 1964 |
| 10 | Conventional Hydroelectric | 55.6 | May 1964 |
| 11 | Conventional Hydroelectric | 55.6 | May 1964 |
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, Inc as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
300 analyst questions a month, plus MCP
Query Conowingo and 14,224 other projects from Claude or your own tools. Free accounts get 1 question a day.
Power plants near Conowingo
More plants operated by Constellation Power, Inc
Questions about Conowingo
How much power does Conowingo produce?
Conowingo reported 1,548,934 MWh (1.55 TWh) of net generation in 2025, a 33.3% capacity factor on 530.8 MW of nameplate capacity. From January to July 2026 it reported 1.08 TWh, which is provisional.
Where is Conowingo?
Conowingo is in Harford County, Maryland, at 39.6572, −76.1752. It is in the PJM Interconnection, LLC balancing area (PJM).
Who operates Conowingo?
EIA-860M for August 2026 lists Constellation Power, Inc as the operator (EIA operator ID 6035). The operator is not always the owner.
When did Conowingo start operating?
Its first generator began operating in March 1928, according to EIA-860M.
Does InfraMap have power prices for Conowingo?
Yes. InfraMap has PJM day-ahead and real-time prices at 11 price nodes linked to Conowingo, 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)
- 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