Grant County — Plant Summary
- EIA Plant ID
- 65007
- Capacity
- 300 MW
- Primary Fuel
- Solar
- Technology
- Batteries, Solar Photovoltaic
- Status
- Operating
- Location
- Grant, WI
- Operating Since
- 2024
- Generators
- 2
- Operator
- Wisconsin Power & Light Co
- Parent Company
- Alliant Energy
- Annual Generation
- 376,240 MWh
- Capacity Factor
- 14.3%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- MRO
Grant County
OperatingBESSSolarHybrid
Ranked #3 of 102 Solar plants in WI#135 of 7447 nationally
300 MW Batteries (100 MW) + Solar Photovoltaic (200 MW) operating in Grant, WI — Midcontinent Independent Transmission System Operator, Inc..
EIAGEM
300 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2024
Operating Since
Location
Coordinates
42.7190, -90.7010
County
Grant, WI
Nearby Plants
- John Deere Dubuque WorksDistillate Oil9 MW · 16.7 km
- Cassville SolarSolar50 MW · 18.0 km
- Alliant SBD 9301 Prairie FarmsDistillate Oil3.5 MW · 21.1 km
Ownership & Operator
Owner data does not fully agree across sources.
EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Wisconsin Power & Light Co | Wisconsin Power and Light | — |
| Owner(s) | Wisconsin Power & Light Co | Alliant Energy | — |
| Status | Operating | operating | — |
Ownership Chain
About
Located in Grant County, Wisconsin, the Grant County power plant is a hybrid facility combining battery storage and solar photovoltaic technologies. It is owned by Alliant Energy and operated by Wisconsin Power & Light Co. The plant has a total capacity of 300 MW across two generators and began operating in 2024. Its primary fuel source is listed as MWH, indicating electricity input.
The Grant County plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the MRO NERC region. In its latest year of operation, the plant generated 376,240 MWh, achieving a capacity factor of 14.3%. The solar component utilizes single-axis tracking. The installed cost was $1,411 per kW, according to FERC filings. The plant is ranked as the second largest of four such facilities in Wisconsin, and 157th out of 514 nationally.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
MRO
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
11.9K MWh
Latest Month
376.2K MWh
Annual Generation
14.3%
Capacity Factor
Financial DataBeta
Source: FERC Form 1HIGH
$1,411/kW
Installed Cost
$2.8/MWh
Operating Cost
Wisconsin Power and Light Company
Reporting Utility
Annual Capital & Operating Expenses
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Tennyson · 138 kV
Substation Distance
< 10 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
ALTE.GRANTCTY
Pricing Hub
MICHIGAN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
News & Articles (10)Beta
Industry·corporate
As Wisconsin weighs who should pay, another possible billion-dollar data center emerges
Grant County officials in southwestern Wisconsin aren't divulging the developer interested in a $1 billion data center in the town of...
Grant County (other)
Wisconsin Watch·4 weeks ago
Industry·corporate
New map reveals locations for wind farm project
A new map reveals where wind turbines are projected to be placed for the first phase of Southwest Wisconsin's largest proposed wind farm.
The Monroe Times·4 weeks ago
Industry·corporate
Pattern Energy releases Uplands Wind East map
A new map reveals where wind turbines are projected to be placed for the first phase of Southwest Wisconsin's largest proposed wind farm.
Pattern Energy (developer)
SWNews4U·4 weeks ago
Grid·capacity addition
Ameresco, Alliant Energy, begin operating record-breaking BESS projects in Arizona, Wisconsin
Ameresco has put Arizona's largest behind-the-meter BESS into operation, meanwhile Alliant has begun operating Wisconsin's largest BESS.
Ameresco (operator)Alliant Energy (operator)
Energy-Storage.News·5 months ago
Last updated 2026-03-14
View all 10 articles