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Rock River — Power plant · Gas, combustion turbine · Wisconsin Power & Light CoDarien Solar — Postponed · Storage · WI · 75 MW · 14.8 mi away
  • Combustion
  • Retired
  • 10 · 100 · 1,000 MW

Rock River

Power plant · Gas, combustion turbine

Key facts

Power plant · Gas, combustion turbineran 0% of 2019 Retired
Capacity
Capacity: sourceEIA-860M · Open licenseMW
Commissioned
1954
Net generation, 2019
2,772 MWh
Grid
138 kV, 69 kV to American Transmission Co (MISO)
Location
Rock County, Wisconsin

Output

Net generation MWh by year, 2001 to 2020
Fuel burned MMBtu by year, 2001 to 2020
  • Gas
  • Oil

Operations detail

Details

Who’s behind it

Owner
Alliant Energy Corp

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Technology
Gas, combustion turbine source: “Natural Gas Fired Combustion Turbine”
Age
72 years since 1954
All 3 attributes from EIA-860M Preliminary Monthly Electric Generator Inventory
AttributeValue
Gem
Parents
Name
Alliant Energy Corp
Share pct
100
Gem entity id
E100000001135
Unit ids
G100000403770, G100000403771
Location id
L100000402377
Eia plant ids
5, 6, 4057
EPA greenhouse gas reporting (GHGRP)
EPA FRS ID
110071160510
Subparts reported
C
NAICS code
221112
Subpart PP (CO2 supply)
No
Subpart RR (geologic sequestration)
No
Subpart UU (CO2 injection)
No
Reporting year
2023
GHGRP facility ID
1005672
Balancing authority codeMISO

Retirement

EIA-860M September 2026StatusEvery generator EIA lists at this plant has retired. As of EIA-860M for September 2026.
Retired
June 2020
First unit retired
April 2010
Capacity retired
318.9 MW
Generators retired
6
GeneratorTechnologyNameplateStateDate
1Natural Gas Steam Turbine75 MWRetiredApril 2010
2Natural Gas Steam Turbine75 MWRetiredApril 2010
3Natural Gas Fired Combustion Turbine37.5 MWRetiredJune 2020
4Natural Gas Fired Combustion Turbine18 MWRetiredJune 2020
5Natural Gas Fired Combustion Turbine56.7 MWRetiredJune 2020
6Natural Gas Fired Combustion Turbine56.7 MWRetiredJune 2020
By technology
TechnologyRetiredScheduled to retire
Natural Gas Fired Combustion Turbine168.9 MW
Natural Gas Steam Turbine150 MW

Grid

EIA-860 2025Grid fieldsAs the plant reported them to EIA-860 for 2025 (Schedule 2).
Grid voltage at the plant
138 kV, 69 kV
Transmission or distribution system owner
American Transmission Co
Balancing authority
Midcontinent Independent Transmission System Operator, Inc..
NERC region
MRO
Transmission lines within 15 mi (10)
Can the connection be reused?

A plant that retires usually leaves its substation, transmission connection and interconnection agreement behind, and those may be reusable by a new project at the same site. FERC Order No. 845 lets an interconnection customer use surplus interconnection service at an existing site, and some transmission providers' tariffs let a replacement resource take over a retiring unit's interconnection service, usually within a set time after the retirement. Whether any such right still exists here, who holds it and on what terms depends on the owner, the transmission provider and timing; this page does not establish any of that.

Ownership

2 companies2
CompanyRoleShareAs ofSource
Wisconsin Power & Light Co Operator EIA-860M
ALLIANT ENERGY CORP Owner 100.0% Dec 31, 2023 EPA GHGRP

Timeline

  • Stated Units 3, 4, 5, 6 scheduled to retire, 168.9 MW · EIA-860M
  • Stated Units 1, 2 scheduled to retire, 150 MW · EIA-860M
  • In service · EIA-860M

Sources

6 sources

Sources EIA-860M · GEM · LBNL · EIA · EIA-860M Preliminary Monthly Electric Generator Inventory · EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)

Sources

  • EIA-860MOpen license · retrieved Nov 4, 2026
  • GEMOpen license, with credit · retrieved Oct 26, 2026Global Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
  • LBNLOpen license, with credit · retrieved Nov 9, 2026Yin, Nait Belaid & Heleno (2026), Lawrence Berkeley National Laboratory, OEDI, CC BY 4.0: A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Modified by Inframation: HIFLD-side fields only, names re-cased, coordinates rounded.
  • EIAOpen license · retrieved Nov 1, 2026Source: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)
  • EIA-860M Preliminary Monthly Electric Generator Inventory
  • EPA Greenhouse Gas Reporting Program — facility register with parent-company shares (Envirofacts pub_dim_facility; FLIGHT)

Every source and license · Attribution

View at source

Around this plant

Nearby

within 15 mi
ProjectKindAwayMW
Darien Solar Postponed Storage 14.8 mi 75

Sources EIA-860M

Sources

  • EIA-860MOpen license · retrieved Nov 4, 2026

Attribution