Conowingo
Harford County, Maryland · EIA plant ID 1574 · Operator: Exelon Power
Nameplate531MWSummer 497 MW
Generators11in service
Net generation1,347GWh12 mo to Aug 2026
Capacity factor31%hydro units, summer MW
Heat rate—thermal plants only
First online1928
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 1,165.2 | 26.0% | — |
| 2002 | 1,638.1 | 36.5% | — |
| 2003 | 2,598 | 54.1% | — |
| 2004 | 2,474 | 51.4% | — |
| 2005 | 1,689.9 | 35.2% | — |
| 2006 | 2,086.2 | 43.5% | — |
| 2007 | 1,629.7 | 32.5% | — |
| 2008 | 1,908 | 38.0% | — |
| 2009 | 1,867 | 37.3% | — |
| 2010 | 1,645.4 | 32.8% | — |
| 2011 | 2,518.5 | 50.3% | — |
| 2012 | 1,639.1 | 32.6% | — |
| 2013 | 1,699.4 | 33.9% | — |
| 2014 | 1,594.6 | 31.8% | — |
| 2015 | 1,597.5 | 31.9% | — |
| 2016 | 1,369 | 27.3% | — |
| 2017 | 1,935.4 | 38.6% | — |
| 2018 | 2,788.4 | 55.6% | — |
| 2019 | 2,161.9 | 43.1% | — |
| 2020 | 1,673.2 | 33.3% | — |
| 2021 | 2,097.2 | 41.9% | — |
| 2022 | 1,756.6 | 35.1% | — |
| 2023 | 1,829.4 | 42.0% | — |
| 2024 | 1,831.2 | 41.9% | — |
| 2025 | 1,548.9 | 35.6% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 45 | 41 | Mar 1928 | Operating | — | coming soon |
| 10 | Conventional Hydroelectric | HY | 55.6 | 56.1 | May 1964 | Operating | — | coming soon |
| 11 | Conventional Hydroelectric | HY | 55.6 | 52 | May 1964 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 36 | 32.7 | Mar 1928 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 48 | 41.9 | Mar 1928 | Operating | — | coming soon |
| 4 | Conventional Hydroelectric | HY | 47.7 | 41.9 | Apr 1928 | Operating | — | coming soon |
| 5 | Conventional Hydroelectric | HY | 36 | 32.7 | Jun 1928 | Operating | — | coming soon |
| 6 | Conventional Hydroelectric | HY | 47.7 | 42.3 | Jul 1928 | Operating | — | coming soon |
| 7 | Conventional Hydroelectric | HY | 48 | 42.3 | Jun 1928 | Operating | — | coming soon |
| 8 | Conventional Hydroelectric | HY | 55.6 | 56.7 | Mar 1964 | Operating | — | coming soon |
| 9 | Conventional Hydroelectric | HY | 55.6 | 57.3 | Mar 1964 | Operating | — | coming soon |
Owner / operator
Operator: Exelon Power. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Exelon Power | 100.0% | 531 MW |
Nearby plants
Within 80 km.
| NAEA Rock Springs LLC | 796 MW | 7 km |
| Wildcat Point Generation Facility | 1,114 MW | 7 km |
| 100a Swiss Dale Farm | — | 10.6 km |
| Peach Bottom | 2,876 MW | 13.9 km |
| York Energy Center | 1,449 MW | 14.4 km |
| IKEA Perryville 460 | 2 MW | 14.8 km |