Alliant Energy — Power Plant Portfolio

61 plants · 8.3 GW total capacity · across 3 states

Alliant Energy operates 61 power plants across 3 states with 8.3 GW total capacity. Their fleet is primarily solar (34 plants).

Largest is Ottumwa (726 MW Sub. Coal); oldest active is Prairie Du Sac (1915); newest is Clinton Schools (2025); top state is Iowa (30 plants).

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Key Stats

Largest fuel
Solar (34 plants)
Largest state
Iowa (30 plants)
Subsidiary operators
Wisconsin Power & Light Co (31)Interstate Power and Light Co (29)Dane County Solar LLC (1)

Plants by State

Iowa (30 plants · 4.8 GW)

Wisconsin (30 plants · 3.3 GW)

Minnesota (1 plants · 201 MW)

Plants by Fuel Type

Solar (34 plants · 1.8 GW)

Wind (10 plants · 1.7 GW)

Natural Gas (8 plants · 3.4 GW)

Battery Storage (4 plants · 16 MW)

Coal (2 plants · 1.2 GW)

Hydroelectric (2 plants · 43 MW)

Oil & Petroleum (1 plants · 90 MW)