LNT · 10-Q · 2026Q3 · Full report

Rate Case Outcomes

ALLIANT ENERGY CORP · 2026-10-30 · Importance 46 · Surprise 42 · In source text

In December 2025, the Public Service Commission of Wisconsin (PSCW) authorized WPL annual base rate increases of $69 million for retail electric customers and $7 million for retail gas customers. The increases apply to the 2026 forward-looking Test Period and reflect higher electric and gas rate base, including investments in wind refurbishment, energy storage, natural gas-fired generation improvements, and electric distribution. The electric rate order also reflects lower forecasted fuel-related expenses.

Key facts

• In August 2026, the IUC ordered IPL to maintain current retail electric rates and reduce annual base rates for retail residential gas customers by $3 million effective October 6, 2026.
• WPL expects to file a retail electric and gas rate review in the second quarter of 2027 for the 2028/2029 forward-looking test period; requested changes are expected to take effect January 1, 2028, with a PSCW decision expected by the end of 2027.
• Investment tax credits from IPL energy storage projects placed in service or expected to be placed in service in 2026 and 2027 may be used to offset annual revenue deficiency up to the earnings-sharing-mechanism threshold in IPL’s retail electric rate review settlement agreement.
• In December 2025, the PSCW authorized an annual $69 million base rate increase for WPL retail electric customers for the 2026 forward-looking Test Period.
• In December 2025, the PSCW authorized an annual $7 million base rate increase for WPL retail gas customers for the 2026 forward-looking Test Period.
• Alliant Energy and WPL expect future operating cash flow to increase from higher earnings on WPL’s increasing rate base.

Impact estimates