Duke Energy, the largest electric power holding company in the U.S., has a market cap of approximately $69 billion and total assets of more than $176 billion. Its regulated utilities serve approximately 8.2 million electric customers in six states in the Southeast and Midwest and 1.6 million natural gas customers. Duke also has the largest regulated nuclear fleet in the U.S. with six nuclear generators in North and South Carolina. Regulated electric currently accounts for about 85% of total revenues. Consolidated energy capacity is about 50,000 megawatts. Duke is focusing expansion on its regulated service territories.