Rock RiverRetired
Rock County, Wisconsin · EIA plant ID 4057 · Operator: Wisconsin Power & Light Co
×169 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 | 171.6 | — | — |
| 2002 | 280.6 | — | — |
| 2003 | 316.2 | 11.9% | 12,404 |
| 2004 | 186.8 | 7.0% | 13,426 |
| 2005 | 159.6 | 6.1% | 14,485 |
| 2006 | 49.2 | 1.9% | 15,216 |
| 2007 | 44.5 | 1.7% | 14,973 |
| 2008 | 25 | 1.0% | 16,441 |
| 2009 | 13.6 | 0.5% | 15,170 |
| 2010 | 6.6 | 0.4% | 15,969 |
| 2011 | 1.3 | 0.1% | 18,772 |
| 2012 | 5.2 | 0.4% | 17,424 |
| 2013 | 4.1 | 0.4% | 17,055 |
| 2014 | 10 | 0.9% | 16,114 |
| 2015 | 7.4 | 0.7% | 15,803 |
| 2016 | 17 | 1.4% | 16,765 |
| 2017 | 16.9 | 1.5% | 16,323 |
| 2018 | 11.7 | 1.2% | 16,227 |
| 2019 | 2.8 | 0.3% | 18,395 |
| 2020 | -0.3 | -0.1% | — |
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 Steam Turbine | ST | 75 | 72.9 | Jan 1954 | Retired Apr 2010 | — | coming soon |
| 2 | Natural Gas Steam Turbine | ST | 75 | 76.7 | Sep 1955 | Retired Apr 2010 | — | coming soon |
| 3 | Natural Gas Fired Combustion Turbine | GT | 37.5 | 21.2 | Aug 1967 | Retired Jun 2020 | — | coming soon |
| 4 | Natural Gas Fired Combustion Turbine | GT | 18 | 15.8 | Dec 1968 | Retired Jun 2020 | — | coming soon |
| 5 | Natural Gas Fired Combustion Turbine | GT | 56.7 | 48.7 | Jun 1972 | Retired Jun 2020 | — | coming soon |
| 6 | Natural Gas Fired Combustion Turbine | GT | 56.7 | 33.7 | Jun 1972 | 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.
| HQC Rock River Solar Power Gen Station | 2 MW | 0.8 km |
| Riverside Energy Center | 675 MW | 0.8 km |
| West Riverside Energy Center | 728 MW | 1.3 km |
| Beloit Memorial Hospital Power Plant | 3 MW | 4.1 km |
| Paddock Solar | 65 MW | 6 km |
| Fairbanks Morse Engine | retired | 7.2 km |