| Public power utility | Retail electric customers |
|---|---|
| Town of Wallingford | 25,100 |
| City of Norwich | 20,898 |
| Groton Dept of Utilities | 13,889 |
| City of South Norwalk | 7,428 |
| Norwalk Third Taxing District | 4,104 |
| Bozrah Light & Power Company | 2,830 |
| City of Jewett City | 2,331 |
| Mohegan Tribal Utility Authority | 76 |
Largest first by retail electric customers, as each employer reports it to its federal registry.
Source: U.S. Energy Information Administration, Annual Electric Power Industry Report (Form EIA-861), 2024 final data. Data captured October 2, 2026.
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