How reliable is the power in Connecticut?
Connecticut ranks 10th of 45 states without major events and 11th with them (1st = fewest minutes), 56 below the U.S. 129 and 509 below the U.S. 662. Major events added 79 minutes, 52% of the with-events total. The figure covers 1,709,458 customers, 98% of the 1,752,428 EIA lists for Connecticut.
Connecticut with and without major events
minutes without power per customer, 2024, Connecticut and U.S.
- 74Connecticut, no major events
- 129U.S., no major events
- 153Connecticut, with major events
- 662U.S., with major events
| Measure | Connecticut without | Connecticut with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 74 | 153 | 129 | 662 |
| SAIFI, interruptions per customer | 0.65 | 0.88 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 113 | 174 | 122 | 433 |
| Median utility, SAIDI minutes | 77 | 159 | — | — |
Which Connecticut utilities move the number
Connecticut Light & Power Co serves 78% of the customers in the Connecticut figure: 81% of lost customer-minutes with major events, 81% without. Without Connecticut Light & Power Co, the weighted figure would be 132 minutes with major events and 62 without, against 153 and 74.
- Connecticut Light & Power Co: 1,326,461 customers (78%), 77 min without and 159 with; 81% of lost minutes with major events, 81% without.
- United Illuminating Co: 345,159 customers (20%), 49 min without and 122 with; 16% of lost minutes with major events, 13% without.
- City of Norwich - (CT): 20,898 customers (1%), 288 min without and 288 with; 2% of lost minutes with major events, 5% without.
All Connecticut utilities in the 2024 file
19 utilities in the 2024 EIA-861 files for Connecticut: 5 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures. 6 are listed.
| Groton Dept of Utilities - (CT) | Municipal | IEEE 1366 | 14,149 | 22 | 117 | 0.19 | 0.75 | 81 | 1 of 4 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| United Illuminating Co | Investor Owned | IEEE 1366 | 345,159 | 49 | 122 | 0.62 | 0.79 | 60 | 2 of 4 | — |
| Connecticut Light & Power Co | Investor Owned | IEEE 1366 | 1,326,461 | 77 | 159 | 0.65 | 0.89 | 52 | 3 of 4 | — |
| City of Norwich - (CT) | Municipal | IEEE 1366 | 20,898 | 288 | 288 | 1.45 | 1.45 | 0 | 4 of 4 | — |
| Town of Wallingford - (CT) | Municipal | Other method | 25,100 | 37 | 214 | 0.29 | 0.81 | — | Not ranked | other method, not comparable |
| Bozrah Light & Power Company | Municipal | IEEE 1366 | 2,791 | 184 | 278 | 0.87 | 1.03 | 34 | Not ranked | under 10,000 customers |
Connecticut utilities with no reliability figures
13 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| Sunrun Inc. | Behind the Meter | 17,293 |
| Tesla Inc. | Behind the Meter | 9,298 |
| Greenskies Renewable Energy, LLC | Behind the Meter | 29 |
| TerraForm US Energy Services, LLC | Behind the Meter | 6 |
| Greenbacker Renewable Energy Corporation | Behind the Meter | 3 |
| City of Jewett City - (CT) | Municipal | — |
| Norwalk Third Taxing District | Municipal | — |
| First Point Power, LLC | Not stated | — |
| Texas Retail Energy, LLC | Not stated | — |
| Constellation NewEnergy, Inc | Not stated | — |
| City of South Norwalk - (CT) | Municipal | — |
| Mohegan Tribal Utility Authority | Political Subdivision | — |
| BP Energy Retail LLC | Not stated | — |
The biggest Connecticut utilities against the U.S.
- Connecticut Light & Power Co (investor owned, 75% of Connecticut customers in the file): SAIDI without major events 77 min, 52 below the U.S. 129; with major events 159 min against 662.
- United Illuminating Co (investor owned, 20% of Connecticut customers in the file): SAIDI without major events 49 min, 80 below the U.S. 129; with major events 122 min against 662.
- Town of Wallingford - (CT) (municipal, 1% of Connecticut customers in the file): reports on another method, SAIFI 0.81, not compared with the U.S. figure.
- City of Norwich - (CT) (municipal, 1% of Connecticut customers in the file): SAIDI without major events 288 min, 159 above the U.S. 129; with major events 288 min against 662.
- Sunrun Inc. (behind the meter, 1% of Connecticut customers in the file): no reliability figures filed.
Connecticut by type of utility
Among Connecticut utilities that report under IEEE 1366, investor owned utilities average 71 minutes without major events and municipal utilities 181.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 2 | 1,671,620 | 71 | 63 | 151 |
| Municipal | 3 | 37,838 | 181 | 184 | 223 |
Next to Connecticut in the ranking
Connecticut report card
Smart meters: 92% of residential meters, 3 utilities (U.S. 92%). Connecticut time-based rates: 2 of 5 utilities, 4.7% of residential customers enrolled (U.S. 10.6%). Connecticut efficiency spend: $97.6 per customer (U.S. $124.2). Demand response: 65 W per customer (U.S. 77). Connecticut net-metered systems: 61.4 per 1,000 customers. Rankings.
Is your Connecticut utility better or worse than the Connecticut median?
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- Connecticut utilities among the best and worst
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- Connecticut electricity prices
- Connecticut help with your bill
6 Connecticut filings in EIA-861 2024 (retrieved 2026-10-01), 4 ranked utilities. Method and sources.
Questions
How many minutes without power did the average Connecticut customer have in 2024?
74 minutes without major events and 153 with them (5 IEEE 1366 utilities, customer-weighted).
Why do the two Connecticut numbers differ so much?
Major events add 79 of the 153 minutes (52%); Connecticut Light & Power Co supplies 81% of the with-events total.
Which Connecticut utility reported the fewest and the most minutes?
Among 4 utilities with 10,000+ customers: Groton Dept of Utilities - (CT) 22 minutes without major events, and City of Norwich - (CT) 288.
Which Connecticut utilities use which method?
5 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures.