Otter Tail Corp

SEGMENT PERFORMANCE

Electric Segment

The following table shows heating degree days and cooling degree days as a percent of normal.

The following table summarizes the estimated effect on diluted earnings per share of the difference in retail kilowatt-hour (kwh) sales under actual weather conditions and expected retail kwh sales under normal weather conditions for the three months ended September 30, 2026 and 2025.

Operating Revenues decreased $3.6 million, primarily due to an $11.9 million aggregate decrease in fuel recovery revenues and the impact of increased production tax credits, neither of which affects net income. These decreases were partially offset by a $5.9 million increase from rate increases in Minnesota and South Dakota, a $2.7 million increase from the recovery of additional rate base investments, and a $2.3 million increase from favorable weather.

Net Income increased $0.1 million as the benefits of interim rate increases, favorable weather, the recovery of additional rate base investments, and higher allowance for funds used during construction associated with continued investments in our large solar projects were largely offset by higher operating and maintenance expenses, including increased labor, vegetation management, and plant outage-related costs, as well as higher depreciation and interest expense associated with rate base growth.

Manufacturing Segment

Operating Revenues increased $12.8 million primarily due to higher sales volumes and the pass through of increased steel costs. Sales volumes increased 13%, reflecting improved demand in the construction, recreational vehicle, lawn and garden, and industrial markets after experiencing softer market conditions and customer inventory reduction efforts during the same period last year.

Net Income decreased $1.3 million driven by higher selling, general, and administrative expenses and lower gross profit margins. Gross margins were negatively impacted by inflationary cost pressures and lower productivity as we added headcount to meet growing demand. These impacts were partially offset by higher sales volumes and increased scrap sales.