Largest U.S. utilities
The Duke Energy-Progress Energy merge would create the largest U.S. utility by market capitalization ($36.5 billion), number of customers (7.1 million) and energy generation capacity (shown below).
| Rank | Utility | Gigawatts |
| 1 | Southern | 42.9 |
| 2 | NextEra (parent of Florida Power & Light) | 42.7 |
| 3 | AEP (American Electric Power) | 37 |
| 4 | Duke | 35.4 |
| 5 | Calpine | 28.3 |
| 6 | Entergy | 27.9 |
| 7 | Dominion | 25.6 |
| 8 | Exelon | 24.9 |
| 9 | First Energy-Allegheny | 23.7 |
| 10 | Progress Energy | 21.8 |
* Based on energy capacity owned as of Sept. 30 for Duke and Progress and as of Dec. 31, 2009, for all others on the list.
Source: Company filings
Residential customer service
Duke Energy delivered the best customer satisfaction to residents in the southeastern United States, the latest J.D. Power survey said. Progress Energy Florida was last. The rankings included 14 utilities that serve the Southeast.
| Rank | Utility | Score |
| 1 | Duke Energy (Carolinas) | 656 |
| 4 | Progess Energy Carolinas | 651 |
| 7 | Florida Power & Light | 645 |
| 13 | Tampa Electric | 610 |
| 14 | Progress Energy Florida | 598 |
Source: J.D. Power and Associates
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