Interstate Power and Light Company (IPL), a subsidiary of Alliant Energy, filed for advance ratemaking principles with the Iowa Utilities Commission (IUC) on July 1, 2025. This filing pertains to a proposed investment of up to 1,000 megawatts of wind generation.
The advance ratemaking process in Iowa allows utilities to gain certainty on the recovery of costs for new generation facilities or significant alterations to existing ones, proactively reducing financial risk. IPL's filing requests an 11.25% return on equity and anticipates 100% tax credits for the project.
A decision from the IUC on this filing is expected in the first quarter of 2026. This strategic move is crucial for IPL's ability to expand its renewable energy portfolio, support its clean energy goals, and ensure the reasonableness and customer benefit of its future investments compared to alternative electricity sources.
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