The top energy companies in the United States encompass both oil and gas supermajors and massive electrical utilities that drive the national economy. In the petroleum and natural gas sector, industry leaders include ExxonMobil, Chevron, ConocoPhillips, and Occidental Petroleum, which command massive market valuations and dominate domestic fuel production. In the regulated utilities and electricity sector, major American power providers like NextEra Energy, Duke Energy, Southern Company, and American Electric Power lead the market in customer base, energy delivery, and infrastructure investment.