Interstate Power and Light Co — Operated Plants

29 plants · 4.6 GW total capacity

Interstate Power and Light Co operates 29 power plants with 4.6 GW total capacity. Primarily solar (13 plants, 521 MW). Parent organization: Alliant Energy.

Largest is Ottumwa (726 MW Sub. Coal); oldest active is Prairie Creek (1958); newest is Clinton Schools (2025).

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Subsidiary of Alliant Energy

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Key Stats

Largest fuel
Solar (13 plants)
Largest state
Iowa (29 plants)

Plants by State

Iowa (29 plants · 4.6 GW)

Plants by Fuel Type

Solar (13 plants · 521 MW)

Wind (7 plants · 1.3 GW)

Natural Gas (5 plants · 2 GW)

Battery Storage (2 plants · 8 MW)

Coal (1 plants · 726 MW)

Oil & Petroleum (1 plants · 90 MW)