LNT · 10-Q · 2026Q3 · Full report

Operating Expense Trends

ALLIANT ENERGY CORP · 2026-10-30 · Importance 19 · Surprise 6

Other operation and maintenance expense increased $88 million for the nine months ended September 30, 2026, with increases of $34 million at IPL and $51 million at WPL. Higher incentive compensation accounted for $37 million of the increase, and higher generation and energy delivery expenses accounted for $23 million. Depreciation and amortization expense rose $34 million, primarily because energy storage and electric distribution projects were placed in service in 2025.

Key facts

• Alliant Energy, IPL and WPL expect depreciation and amortization expense to increase in 2027 compared with 2026 due to capital projects placed in service in 2026 and 2027.
• Alliant Energy, IPL and WPL expect interest expense to increase in 2027 compared with 2026 due to financings completed in 2026 and planned in 2027.
• Alliant Energy’s effective income tax rates for the three and nine months ended September 30, 2026 were affected by additional tax credits from renewable generation and energy storage projects previously placed in service and projects expected to be placed in service during 2026.