RockGen Energy Center
Natural gas power plant · Dane County, Wisconsin
Nameplate capacity
561 MW
Rank in Wisconsin
#10
of 278 plants
In service since
2001
June 2001
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- Dairyland Power Coop
- County
- Dane County
- Generating units
- 3
- Share of state capacity
- 2.84%
- Rank among natural gas plants in Wisconsin
- #5 of 41
- EIA plant code
- 55391
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 01 | Natural Gas Fired Combustion Turbine | 187 MW | 163 MW | 2001 | Operating |
| 02 | Natural Gas Fired Combustion Turbine | 187 MW | 163 MW | 2001 | Operating |
| 03 | Natural Gas Fired Combustion Turbine | 187 MW | 163 MW | 2001 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Wisconsin
| South Oak Creek | Coal | 642 MW |
| Fox Energy Center | Natural gas | 619 MW |
| Edgewater | Coal | 414 MW |
| Germantown | Natural gas | 391 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 561 MW solar plant and a 561 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Wisconsin power plants · What Wisconsin actually generates