RockGen Energy Center
Natural gas power plant in Dane County, Wisconsin. 561 MW of nameplate capacity across 3 generators, operated by Dairyland Power Coop.
Also known as EIA plant 55391
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Key facts
- Capacity
- 561 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- June 2001First generator online
- Operator
- Dairyland Power CoopEIA operator ID 4716
- Grid
- MISOBalancing authority MISO
- Price nodes
- 3 MISO nodesResource nodes with prices
- Location
- Dane County, WI42.9767, −89.0492
- EIA plant ID
- 55391EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power RockGen produces
Free · EIA-923Net generation, 2025
496 GWh
496,408 MWh, final
Capacity factor, 2025
10.1%
2024: 8.2%
January to July 2026
363 GWh
Provisional
Range, 2015 to 2025
142.7–682.7
GWh a year. Low 2015, high 2021
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 156,091 | Not reported | 7 of 12 |
| 2002 | 118,650 | Not reported | 12 of 12 |
| 2003 | 218,592 | Not reported | 12 of 12 |
| 2004 | 234,385 | Not reported | 12 of 12 |
| 2005 | 328,802 | Not reported | 12 of 12 |
| 2006 | 154,557 | Not reported | 12 of 12 |
| 2007 | 92,355 | Not reported | 12 of 12 |
| 2008 | 76,730 | Not reported | 12 of 12 |
| 2009 | 147,590 | Not reported | 12 of 12 |
| 2010 | 167,654 | 3.4% | 12 of 12 |
| 2011 | 180,192 | Not reported | 12 of 12 |
| 2012 | 259,436 | Not reported | 12 of 12 |
| 2013 | 170,630 | 3.5% | 12 of 12 |
| 2014 | 51,831 | 1.6% | 8 of 12 |
| 2015 | 142,682 | 2.9% | 12 of 12 |
| 2016 | 395,145 | 8.0% | 12 of 12 |
| 2017 | 384,911 | 7.8% | 12 of 12 |
| 2018 | 454,799 | 9.3% | 12 of 12 |
| 2019 | 486,777 | 9.9% | 12 of 12 |
| 2020 | 434,914 | 8.8% | 12 of 12 |
| 2021 | 682,744 | 13.9% | 12 of 12 |
| 2022 | 580,846 | 11.8% | 12 of 12 |
| 2023 | 547,281 | 11.1% | 12 of 12 |
| 2024 | 404,644 | 8.2% | 12 of 12 |
| 2025 | 496,408 | 10.1% | 12 of 12 |
| 2026 (provisional, partial year) | 363,057 | 12.7% | 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 · MISOEmissions
Free · EPA CAMPDCO₂, 2025
365,315
US short tons. 2024: 276,453
SO₂, 2025
2
US short tons
NOx, 2025
112
US short tons
CO₂ per MWh, calculated
0.74 t
About 1,472 lb per MWh
3 of 3 EPA units reported CO₂ in 2025 (CT-1, CT-2, CT-3), matched to EIA plant 55391 through the EPA–EIA crosswalk. The per-MWh rate is EPA CO₂ divided by EIA-923 net generation. The two reporting boundaries can differ.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 01 | Natural Gas Fired Combustion Turbine | 187.0 | June 2001 |
| 02 | Natural Gas Fired Combustion Turbine | 187.0 | June 2001 |
| 03 | Natural Gas Fired Combustion Turbine | 187.0 | June 2001 |
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 Dairyland Power Coop as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
Generation potential vs reported
Monthly potential at seasonal net capability, next to EIA-923 output. Shows how much of the plant's capability was used.
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Power plants near RockGen
More plants operated by Dairyland Power Coop
Questions about RockGen
How much power does RockGen Energy Center produce?
RockGen Energy Center reported 496,408 MWh (496 GWh) of net generation in 2025, a 10.1% capacity factor on 561 MW of nameplate capacity. From January to July 2026 it reported 363 GWh, which is provisional.
Where is RockGen Energy Center?
RockGen Energy Center is in Dane County, Wisconsin, at 42.9767, −89.0492. It is in the Midcontinent Independent Transmission System Operator, Inc.. balancing area (MISO).
Who operates RockGen Energy Center?
EIA-860M for August 2026 lists Dairyland Power Coop as the operator (EIA operator ID 4716). The operator is not always the owner.
When did RockGen Energy Center start operating?
Its first generator began operating in June 2001, according to EIA-860M.
Does InfraMap have power prices for RockGen Energy Center?
Yes. InfraMap has MISO day-ahead and real-time prices at 3 price nodes linked to RockGen Energy Center, 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)
- EPA CAMPD annual emissions through the EPA–EIA crosswalk, 1995 to 2025
- 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