Unitil Energy Systems
Investor Owned electric utility · New Hampshire · #563 of 3,199 U.S. utilities by customers · EIA utility #24590
Unitil Energy Systems is a investor owned electric utility serving 28,173 customers in New Hampshire. In 2025 it sold 253 gigawatt-hours of electricity for $54.60M in revenue, an average realized rate of 21.61¢ per kWh across all customer classes and 21.72¢ per kWh for residential customers. Its reported service territory covers 2 counties. EIA records its activities as: generation, buying transmission, distribution.
Customers, sales and rates by customer class (2025)
| Class | Customers | Sales (GWh) | Revenue | Avg realized rate | Share of sales |
|---|---|---|---|---|---|
| Residential | 24,452 | 176 | $38.31M | 21.72¢ | |
| Commercial | 3,701 | 61.0 | $13.48M | 22.09¢ | |
| Industrial | 20 | 15.3 | $2.82M | 18.38¢ | |
| Total | 28,173 | 253 | $54.60M | 21.61¢ |
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 (601 kWh/month).
Five-year trend
| Year | Customers | Sales (GWh) | Revenue | Residential rate |
|---|---|---|---|---|
| 2021 | 71,712 | 700 | $130.16M | 18.87¢ |
| 2022 | 71,851 | 686 | $162.49M | 24.23¢ |
| 2023 | 64,256 | 565 | $179.10M | 32.47¢ |
| 2024 | 45,663 | 408 | $94.74M | 23.33¢ |
| 2025 | 28,173 | 253 | $54.60M | 21.72¢ |
Reliability (2025)
Average outage time (SAIDI): 98 minutes per customer per year
Average outages (SAIFI): 1.36 per customer
Average restoration time (CAIDI): 72 minutes
As reported for New Hampshire 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: 363 GWh
Winter peak demand: 202 MW
Energy losses: 3.5% of energy handled
Meters & rooftop solar (2025)
Smart (AMI) meters: 99.9% of 82,853 meters
Customer-sited generation (net metering): 2,804 installations, 39.3 MW of capacity
This utility also reported 53,828 delivery-only customers (923 GWh delivered) in 2025. Delivery figures are excluded from the totals above because the same electricity is also reported by the energy supplier - see Methodology.
Counties served
Merrimack, NHRockingham, NH
Other large utilities in New Hampshire
- Public Service Co of NH - 299,998 customers, residential 24.17¢
- Community Power Coalition of NH - 204,201 customers, residential 10.56¢
- New Hampshire Elec Coop Inc - 79,113 customers, residential 24.70¢
- North American Power and Gas, LLC - 31,395 customers, residential 15.84¢
- Liberty Utilities (Granite State Electri - 26,588 customers, residential 22.59¢
- Electricity NH, LLC - 14,183 customers, residential 14.84¢
- Town of Wolfeboro - (NH) - 6,031 customers, residential —
- Town of Littleton - (NH) - 4,064 customers, residential —
All New Hampshire utilities and rates
Source: U.S. Energy Information Administration, Form EIA-861 2025 (filed by the utility; figures as published). Utility #24590 in the EIA frame.