Groton Dept of Utilities - (CT)
Municipal electric utility · Connecticut · #918 of 3,199 U.S. utilities by customers · EIA utility #7716
Groton Dept of Utilities - (CT) is a municipal electric utility serving 14,193 customers in Connecticut. In 2025 it sold 408 gigawatt-hours of electricity for $64.91M in revenue, an average realized rate of 15.92¢ per kWh across all customer classes and 18.05¢ per kWh for residential customers. Its reported service territory covers 1 counties. EIA records its activities as: distribution, bundled.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 12,596 | 112 | $20.20M | 18.05¢ | |
| Commercial | 1,580 | 94.8 | $16.67M | 17.59¢ | |
| Industrial | 17 | 201 | $28.04M | 13.95¢ | |
| Total | 14,193 | 408 | $64.91M | 15.92¢ |
Average realized rate = revenue divided by sales as reported on EIA Form 861. It blends fixed charges, demand charges and riders into one per-kWh figure; it is not the utility's tariff rate. Estimated residential bill assumes the average residential customer's actual 2025 usage (740 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 13,857 | 461 | $56.48M | 15.90¢ |
| 2022 | 13,858 | 461 | $63.42M | 17.68¢ |
| 2023 | 13,850 | 401 | $64.98M | 20.07¢ |
| 2024 | 13,889 | 385 | $61.72M | 18.70¢ |
| 2025 | 14,193 | 408 | $64.91M | 18.05¢ |
Reliability (2025)
Average outage time (SAIDI): 71 minutes per customer per year
Average outages (SAIFI): 0.36 per customer
Average restoration time (CAIDI): 198 minutes
As reported for Connecticut under the IEEE standard, with major event days included where the standard reports them. Lower is better; see the reliability rankings.
Energy supply (2025)
Net generation: — GWh
Wholesale power purchased: 429 GWh
Winter peak demand: 71 MW
Energy losses: 3.0% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 99.6% of 14,680 meters
Customer-sited generation (net metering): 828 installations, 4.6 MW of capacity
Counties served
New London, CT
Other large utilities in Connecticut
- Connecticut Light & Power Co - 1,072,114 customers, residential 28.88¢
- United Illuminating Co - 277,914 customers, residential 35.40¢
- Think Energy, LLC - 90,425 customers, residential 11.78¢
- Town Square Energy - 85,979 customers, residential 13.09¢
- Town of Wallingford - (CT) - 25,123 customers, residential 17.78¢
- City of Norwich - (CT) - 20,996 customers, residential 23.35¢
- XOOM Energy Connecticut, LLC - 10,627 customers, residential 13.09¢
- City of South Norwalk - (CT) - 7,439 customers, residential —
All Connecticut utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #7716 in the EIA frame.