SheepskinRetired
Rock County, Wisconsin · EIA plant ID 4059 · Operator: Wisconsin Power & Light Co
×42 MW natural gas retired since 2020 (latest Jun 2020)
Nameplate—MWSummer — MW
Generators0in service
Net generation—GWh12 mo
Capacity factor—no 923 generation in the last 12 months
Heat rate—Btu/kWhfossil units, electric fuel, HHV
First online—
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), primary-fuel 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.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 0.9 | 0.3% | 18,445 |
| 2002 | 2.9 | 0.9% | 15,415 |
| 2003 | 0.9 | 0.3% | 19,470 |
| 2004 | 0.4 | 0.1% | 19,466 |
| 2005 | 1.4 | 0.4% | 9,458 |
| 2006 | 0.2 | 0.1% | 28,077 |
| 2007 | 1.3 | 0.4% | 20,892 |
| 2008 | 0.9 | 0.3% | 20,109 |
| 2009 | 0.5 | 0.2% | 24,477 |
| 2010 | 0.9 | 0.3% | 23,812 |
| 2011 | 1.5 | 0.5% | 21,025 |
| 2012 | 1.9 | 0.6% | 19,389 |
| 2013 | 0.6 | 0.2% | 21,617 |
| 2014 | 0.1 | 0.0% | — |
| 2015 | 0.7 | 0.3% | — |
| 2016 | 1.2 | 0.4% | 23,393 |
| 2017 | 2.8 | 0.9% | 18,809 |
| 2018 | 2.1 | 0.9% | 20,834 |
| 2019 | 0.6 | 0.2% | 21,492 |
| 2020 | -0 | -0.0% | — |
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 | Natural Gas Fired Combustion Turbine | GT | 41.7 | 36.4 | Jun 1971 | Retired Jun 2020 | — | coming soon |
Owner / operator
Operator: Wisconsin Power & Light Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
Nearby plants
Within 80 km.
| North Rock | 50 MW | 2.8 km |
| Janesville Community Solar | 2 MW | 14.3 km |
| Rock County Customer Hosted Solar | 1 MW | 14.3 km |
| Ameresco Janesville | 3 MW | 15.9 km |
| Koshkonong Solar Energy Center LLC | — | 16.1 km |
| RockGen Energy Center | 561 MW | 16.6 km |