O'Brien Solar Fields
Solar power plant in Dane County, Wisconsin. 22.1 MW of nameplate capacity across 3 generators, operated by Madison Gas & Electric Co.
Also known as EIA plant 64590
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 22.1 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- May 2021First generator online
- Operator
- Madison Gas & Electric CoEIA operator ID 11479
- Grid
- MISOBalancing authority MISO
- Price nodes
- 3 MISO nodesResource nodes with prices
- Location
- Dane County, WI42.9977, −89.4590
- EIA plant ID
- 64590EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power O'Brien Solar Fields produces
Free · EIA-923Net generation, 2025
37.4 GWh
37,447 MWh, final
Capacity factor, 2025
19.3%
2024: 19.8%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2022 to 2025
37.4–38.5
GWh a year. Low 2023, high 2022
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | Not reported | Not reported | 0 of 12 |
| 2002 | Not reported | Not reported | 0 of 12 |
| 2003 | Not reported | Not reported | 0 of 12 |
| 2004 | Not reported | Not reported | 0 of 12 |
| 2005 | Not reported | Not reported | 0 of 12 |
| 2006 | Not reported | Not reported | 0 of 12 |
| 2007 | Not reported | Not reported | 0 of 12 |
| 2008 | Not reported | Not reported | 0 of 12 |
| 2009 | Not reported | Not reported | 0 of 12 |
| 2010 | Not reported | Not reported | 0 of 12 |
| 2011 | Not reported | Not reported | 0 of 12 |
| 2012 | Not reported | Not reported | 0 of 12 |
| 2013 | Not reported | Not reported | 0 of 12 |
| 2014 | Not reported | Not reported | 0 of 12 |
| 2015 | Not reported | Not reported | 0 of 12 |
| 2016 | Not reported | Not reported | 0 of 12 |
| 2017 | Not reported | Not reported | 0 of 12 |
| 2018 | Not reported | Not reported | 0 of 12 |
| 2019 | Not reported | Not reported | 0 of 12 |
| 2020 | Not reported | Not reported | 0 of 12 |
| 2021 | 22,728 | Not reported | 8 of 12 |
| 2022 | 38,503 | 19.9% | 12 of 12 |
| 2023 | 37,440 | 19.3% | 12 of 12 |
| 2024 | 38,452 | 19.8% | 12 of 12 |
| 2025 | 37,447 | 19.3% | 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 · MISOEmissions
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 |
|---|---|---|---|
| OBSFN | Solar Photovoltaic | 8.3 | May 2021 |
| OBSFS | Solar Photovoltaic | 8.3 | May 2021 |
| OBSFW | Solar Photovoltaic | 5.5 | May 2021 |
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 Madison Gas & Electric Co as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Modeled curtailment
A range, not one number. The lower bound counts hours inside the production tax credit window; the upper bound is the no-credit case.
Expected vs reported generation
Monthly modeled expected output and physical potential next to EIA-923 reported output.
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Power plants near O'Brien Solar Fields
More plants operated by Madison Gas & Electric Co
Questions about O'Brien Solar Fields
How much power does O'Brien Solar Fields produce?
O'Brien Solar Fields reported 37,447 MWh (37.4 GWh) of net generation in 2025, a 19.3% capacity factor on 22.1 MW of nameplate capacity.
Where is O'Brien Solar Fields?
O'Brien Solar Fields is in Dane County, Wisconsin, at 42.9977, −89.4590. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates O'Brien Solar Fields?
EIA-860M for August 2026 lists Madison Gas & Electric Co as the operator (EIA operator ID 11479). The operator is not always the owner.
When did O'Brien Solar Fields start operating?
Its first generator began operating in May 2021, according to EIA-860M.
Does InfraMap have power prices for O'Brien Solar Fields?
Yes. InfraMap has MISO day-ahead and real-time prices at 3 price nodes linked to O'Brien Solar Fields, 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)
- MISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page