Cassville Solar — Plant Summary
- EIA Plant ID
- 64995
- Capacity
- 50 MW
- Primary Fuel
- Solar
- Technology
- Solar Photovoltaic
- Status
- Operating
- Location
- Grant, WI
- Operating Since
- 2023
- Generators
- 1
- Operator
- Wisconsin Power & Light Co
- Parent Company
- Alliant Energy
- Annual Generation
- 97,716 MWh
- Capacity Factor
- 22.3%
- Balancing Authority
- Midcontinent Independent Transmission System Operator, Inc..
- ISO/RTO
- MISO
- NERC Region
- MRO
Cassville Solar
OperatingSolar
Ranked #18 of 102 Solar plants in WI#1351 of 7447 nationally
50 MW Solar operating in Grant, WI — Midcontinent Independent Transmission System Operator, Inc..
EIAGEM
50 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2023
Operating Since
Location
Coordinates
42.7399, -90.9201
County
Grant, WI
Nearby Plants
- Grant CountyBESS300 MW · 18.0 km
- John Deere Dubuque WorksDistillate Oil9 MW · 26.9 km
- Mt. Hope DPC SolarSolar1 MW · 27.3 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
Cassville Solar is a 50 MW solar photovoltaic power plant located in Grant County, Wisconsin. The plant, which began operating in 2023, is owned by Alliant Energy and operated by Wisconsin Power & Light Co. It consists of a single generator utilizing single-axis tracking technology. Cassville Solar ranks as the 18th largest solar plant in Wisconsin out of 99, and 1179th nationally out of 7108.
In its most recent year of operation, Cassville Solar generated 97,716 MWh of electricity, achieving a capacity factor of 22.3%. The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the MRO NERC region. Financial data indicates an installed cost of $2,067 per kW, as reported to FERC.
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
Interconnection Queue1 projectBeta
OperationalSolar50 MWMISOLBNL + Live
Generation
3.3K MWh
Latest Month
97.7K MWh
Annual Generation
22.3%
Capacity Factor
Financial DataBeta
Source: FERC Form 1HIGH
$1,953/kW
Installed Cost
$3.0/MWh
Operating Cost
Wisconsin Power and Light Company
Reporting Utility
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Cassville Solar Farm · 138 kV
Substation Distance
< 10 km
Operator
Alliant Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
ALTE.CASSVILLE
Pricing Hub
MICHIGAN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
News & Articles (9)Beta
Industry·corporate
Burns & McDonnell Completes 866-MW Alliant Energy Solar Program in Wisconsin
KANSAS CITY, Missouri — Burns & McDonnell has completed engineer-procure-construct (EPC) and self-perform construction services for nine...
Burns & McDonnell (developer)Alliant Energy (buyer)
Burns & McDonnell·2 years ago
Industry·corporate
Burns & McDonnell completes 764 MW solar portfolio in Wisconsin
The engineering, procurement, and construction firm completed the projects for utility Alliant Energy.
Burns & McDonnell (developer)Alliant Energy (buyer)
pv magazine USA·2 years ago
Industry·corporate
Burns & McDonnell finalizes 9-project, 764-MW solar portfolio
Burns & McDonnell has completed engineer-procure-construct (EPC) and self-perform construction services for nine solar projects across Wisconsin.
Burns & McDonnell (developer)
Solar Power World·2 years ago
Industry·corporate
Alliant Energy triples its solar generating capacity with completion of six new sites.
Already the state's largest owner-operator of solar installations in Wisconsin, Alliant's five new sites triple the power it gets from the...
Alliant Energy (operator)
Milwaukee Journal Sentinel·2 years ago
Last updated 2026-03-14
View all 9 articles