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150 MW Solar operating in Sheboygan, WI
150 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2023
Operating Since
Coordinates
43.6002, -87.8966
County
Sheboygan, 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 | — |
Onion River is a 150 MW solar photovoltaic power plant located in Sheboygan County, Wisconsin. The plant, which began operating in 2023, utilizes single-axis tracking technology. It is owned by Alliant Energy and operated by Wisconsin Power & Light Co. Onion River is connected to the Midcontinent Independent Transmission System Operator (MISO) balancing authority.
The plant's latest annual generation was 255,689 MWh, resulting in a capacity factor of 19.4%. Onion River is the 7th largest solar plant in Wisconsin (out of 11) and ranks 359th nationally (out of 639). The installed cost of the plant was $1,515 per kW, according to FERC data.
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
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7.5K MWh
Latest Month
255.7K MWh
Annual Generation
19.4%
Capacity Factor
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Solar photovoltaic · Wisconsin Power and Light Company · Data from 2023–2024
$1,512/kW
Installed Cost
$-3/kW
Annual CapEx
$0.6/MWh
Operating Cost
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Market Position
ISO/RTO Market
MISO
LMP Node
ALTE.ONIONRIV
Pricing Hub
MICHIGAN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-03-26
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