Marys Lake
Hydro power plant in Larimer County, Colorado. 8.1 MW of nameplate capacity across 1 generator, operated by U S Bureau of Reclamation.
Also known as Marys Lake Powerplant · EIA plant 517
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Key facts
- Capacity
- 8.1 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- May 1951First generator online
- Operator
- U S Bureau of ReclamationEIA operator ID 2518
- Grid
- WACMBalancing authority WACM
- Price nodes
- 1 SPP nodeResource nodes with prices
- Location
- Larimer County, CO40.3441, −105.5343
- EIA plant ID
- 517EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Marys Lake produces
Free · EIA-923Net generation, 2025
36.5 GWh
36,485 MWh, final
Capacity factor, 2025
51.4%
2024: 6.4%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
0.0–46.3
GWh a year. Low 2023, high 2019
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 44,034 | Not reported | 12 of 12 |
| 2001 | 43,643 | Not reported | 12 of 12 |
| 2002 | 39,366 | Not reported | 12 of 12 |
| 2003 | 16,730 | Not reported | 12 of 12 |
| 2004 | 30,713 | Not reported | 12 of 12 |
| 2005 | 16,302 | Not reported | 12 of 12 |
| 2006 | 38,173 | Not reported | 12 of 12 |
| 2007 | 47,125 | Not reported | 12 of 12 |
| 2008 | 48,202 | Not reported | 12 of 12 |
| 2009 | 41,304 | Not reported | 12 of 12 |
| 2010 | 34,085 | 48.0% | 12 of 12 |
| 2011 | 44,026 | 62.0% | 12 of 12 |
| 2012 | 50,019 | 70.3% | 12 of 12 |
| 2013 | 27,759 | 39.1% | 12 of 12 |
| 2014 | 35,205 | 49.6% | 12 of 12 |
| 2015 | 18,996 | 26.8% | 12 of 12 |
| 2016 | 36,793 | 51.7% | 12 of 12 |
| 2017 | 31,145 | 43.9% | 12 of 12 |
| 2018 | 44,046 | 62.1% | 12 of 12 |
| 2019 | 46,269 | 65.2% | 12 of 12 |
| 2020 | 33,907 | 47.7% | 12 of 12 |
| 2021 | 42,086 | 59.3% | 12 of 12 |
| 2022 | 22,691 | 32.0% | 12 of 12 |
| 2023 | 0 | 0.0% | 12 of 12 |
| 2024 | 4,549 | 6.4% | 12 of 12 |
| 2025 | 36,485 | 51.4% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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 · SPPEmissions
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 | 8.1 | May 1951 |
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 U S Bureau of Reclamation as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Marys Lake
More plants operated by U S Bureau of Reclamation
Questions about Marys Lake
How much power does Marys Lake produce?
Marys Lake reported 36,485 MWh (36.5 GWh) of net generation in 2025, a 51.4% capacity factor on 8.1 MW of nameplate capacity.
Where is Marys Lake?
Marys Lake is in Larimer County, Colorado, at 40.3441, −105.5343. It is in the Western Area Power Administration - Rocky Mountain Region balancing area (WACM).
Who operates Marys Lake?
EIA-860M for August 2026 lists U S Bureau of Reclamation as the operator (EIA operator ID 2518). The operator is not always the owner.
When did Marys Lake start operating?
Its first generator began operating in May 1951, according to EIA-860M.
Does InfraMap have power prices for Marys Lake?
Yes. InfraMap has SPP day-ahead and real-time prices at 1 price node linked to Marys Lake, 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)
- SPP 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