SO · 8-K · 20261105PR000071

Renewable Generation Transition

SOUTHERN CO · 2026-11-05 · Importance 77 · Surprise 82

Southern Power Company’s wind-facility repowering generated $414 million in pre-tax accelerated depreciation and decommissioning costs during the nine months ended September 30, 2026. These costs are expected to continue until the projects are completed through the third quarter of 2027. At September 30, 2026, remaining pre-tax costs were projected at approximately $100 million for 2026 and $135 million for 2027.