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250 MW Solar operating in Rock, WI
250 MW
Nameplate Capacity
1
Generators
unit
Solar Photovoltaic
Technology
2025
Operating Since
Coordinates
42.6200, -88.7400
County
Rock, WI
Nearby Plants
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Request a demo →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 Electric Power Co | Wisconsin Electric Power | — |
| Owner(s) | Madison Gas & Electric Co, Wisconsin Electric Power Co, Wisconsin Public Service Corp | Invenergy LLC | — |
| Status | Operating | operating | — |
Darien Solar is a 250 MW solar photovoltaic power plant located in Rock County, Wisconsin. The plant, which began operating in 2025, is owned and operated by Wisconsin Electric Power Co. It utilizes a single generator and fixed-tilt solar tracking technology. Darien Solar is the second-largest solar plant in Wisconsin out of 11, and ranks 119th nationally among 639 solar facilities.
The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the Midwest Reliability Organization (MRO) NERC region. In its latest year of operation, Darien Solar generated 314,613 MWh of electricity, achieving a capacity factor of 17.1%.
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
7.1K MWh
Latest Month
314.6K MWh
Annual Generation
17.1%
Capacity Factor
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Request a demo →2023
$1,606/kW
Est. Construction Cost
Total estimated cost: $401.5M
Point of Interconnection
Nearest Substation
West Darien · 138 kV
Substation Distance
1.934 km
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
WEC.DAR_SLR1
Pricing Hub
MICHIGAN.HUB
Alt. Hub / Zone
ILLINOIS.HUB
Location Type
Generation Node
Node Source
Curated node match
Last updated 2026-03-26
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