Darien Solar

OperatingSolar

Ranked #4 of 102 Solar plants in WI#196 of 7447 nationally

250 MW Solar operating in Rock, WI — Midcontinent Independent Transmission System Operator, Inc..

EIAGEM

250 MW

Nameplate Capacity

Generators

unit

Solar Photovoltaic

Technology

2025

Operating Since

Location

Coordinates

42.6200, -88.7400

County

Rock, WI

Nearby Plants

LaFayette Solar WI, LLC
Solar6 MW · 19.2 km
Lawrence Solar 1 LLC
Solar2 MW · 19.4 km
Lawrence Solar 2 LLC
Solar2 MW · 19.4 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 Electric Power Co	Wisconsin Electric Power	—
Owner(s)	Madison Gas & Electric Co, Wisconsin Electric Power Co, Wisconsin Public Service Corp	Invenergy LLC [100%]	—
Status	Operating	operating	—

Ownership Chain

About

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

EIA Plant Profile Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

MRO

Balancing Authority

Midcontinent Independent Transmission System Operator, Inc..

Grid Voltage

138 kV

Regulatory Status

Entity Type