D — Dominion Energy, Inc.

Southern Company is one of the largest U.S. electric utilities, serving millions of customers across Georgia, Alabama, Mississippi, and other southeastern states through its subsidiaries Georgia Power, Alabama Power, and Mississippi Power. The company completed the construction of Plant Vogtle Units 3 and 4 — the first new nuclear reactors built in the United States in over 30 years — a project that significantly exceeded its original budget and timeline. Southern Company also develops renewable energy through Southern Power and has natural gas distribution through Southern Company Gas.

Duke Energy is the largest U.S. electric utility by customer count, serving approximately 8 million electric customers across the Carolinas, Florida, Indiana, Ohio, and Kentucky. The company is undertaking a massive multi-year capital investment program in grid modernization, renewable energy, and natural gas infrastructure. Duke is transitioning its generation mix away from coal toward a combination of solar, wind, natural gas, and nuclear power. Duke Indiana and Duke Ohio are undergoing rate case proceedings to recover this clean energy transition investment.

NextEra Energy is the world's largest producer of wind and solar energy and operates the regulated Florida Power & Light (FPL) utility, the largest regulated electric utility in the United States by customer count. NextEra Energy Resources (NEER) is the company's renewable energy development and generation arm, with one of the largest wind and solar portfolios globally. The company is often viewed as a hybrid between a traditional regulated utility and a renewable energy growth company, trading at a premium to most utility peers.