Otter Tail Corp

SEGMENT PERFORMANCE

Electric Segment

The following table shows heating 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 March 31, 2025 and 2024.

Operating Revenues increased $8.2 million primarily due to an increase in fuel recovery revenues from an increase in the volume and price of market energy purchases and the impact of favorable weather compared to the same period last year, as the first quarter in 2024 was unseasonably warm in our service territory. Interim revenues in North Dakota increased compared to the same period last year driven by increased customer demand and consumption. These increases in operating revenues were partially offset by a net decrease in rider revenues primarily due to increased production tax credits from our wind generation, which are passed on to customers in the form of lower rates, partially offset by additional recovery of costs associated with our wind repowering projects.

Net Income increased $2.2 million primarily due to the increase in revenues, as described above, partially offset by increased depreciation and interest expense related to capital investments and financing costs associated with our rate base investments.