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300 MW Batteries (100 MW) + Solar Photovoltaic (200 MW) operating in Grant, WI
300 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2024
Operating Since
Coordinates
42.7190, -90.7010
County
Grant, WI
Nearby Plants
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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 | — |
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
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
11.9K MWh
Latest Month
376.2K MWh
Annual Generation
14.3%
Capacity Factor
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Solar photovoltaic · Wisconsin Power and Light Company · Data from 2024
$1,411/kW
Installed Cost
$2.8/MWh
Operating Cost
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Point 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
Alt. Hub / Zone
ILLINOIS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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