How reliable is the power in Delaware?
Delaware ranks 7th of 45 states without major events and 8th with them (1st = fewest minutes), 63 below the U.S. 129 and 544 below the U.S. 662. Major events added 51 minutes, 43% of the with-events total. The figure covers 468,340 customers, 90% of the 519,445 EIA lists for Delaware.
Delaware with and without major events
minutes without power per customer, 2024, Delaware and U.S.
- 67Delaware, no major events
- 129U.S., no major events
- 118Delaware, with major events
- 662U.S., with major events
| Measure | Delaware without | Delaware with | U.S. without | U.S. with |
|---|---|---|---|---|
| SAIDI, minutes per customer | 67 | 118 | 129 | 662 |
| SAIFI, interruptions per customer | 0.73 | 0.85 | 1.06 | 1.53 |
| CAIDI, minutes per interruption | 92 | 138 | 122 | 433 |
| Median utility, SAIDI minutes | 68 | 96 | — | — |
Which Delaware utilities move the number
Delmarva Power serves 72% of the customers in the Delaware figure: 78% of lost customer-minutes with major events, 73% without. Without Delmarva Power, the weighted figure would be 95 minutes with major events and 64 without, against 118 and 67.
- Delmarva Power: 337,507 customers (72%), 68 min without and 127 with; 78% of lost minutes with major events, 73% without.
- Delaware Electric Cooperative: 117,394 customers (25%), 61 min without and 96 with; 20% of lost minutes with major events, 23% without.
- City of Newark - (DE): 13,439 customers (3%), 84 min without and 84 with; 2% of lost minutes with major events, 4% without.
All Delaware utilities in the 2024 file
17 utilities in the 2024 EIA-861 files for Delaware: 3 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures. 4 are listed.
| Delaware Electric Cooperative | Cooperative | IEEE 1366 | 117,394 | 61 | 96 | 0.94 | 1.11 | 36 | 1 of 3 | — |
|---|---|---|---|---|---|---|---|---|---|---|
| Delmarva Power | Investor Owned | IEEE 1366 | 337,507 | 68 | 127 | 0.65 | 0.77 | 46 | 2 of 3 | — |
| City of Newark - (DE) | Municipal | IEEE 1366 | 13,439 | 84 | 84 | 0.77 | 0.77 | 0 | 3 of 3 | — |
| City of Milford - (DE) | Municipal | Other method | 8,735 | 20 | 20 | 0.20 | 0.20 | — | Not ranked | other method, not comparable; under 10,000 customers |
Delaware utilities with no reliability figures
13 in the sales file, no SAIDI or SAIFI row.
| Utility | Type | Customers |
|---|---|---|
| City of Dover - (DE) | Municipal | 25,126 |
| Town of Middletown - (DE) | Municipal | 10,168 |
| Tesla Inc. | Behind the Meter | 3,328 |
| Sunrun Inc. | Behind the Meter | 390 |
| Constellation NewEnergy, Inc | Not stated | — |
| City of Seaford- (DE) | Municipal | — |
| New Castle Municipal Serv Comm | Municipal | — |
| Freepoint Energy Solutions LLC | Not stated | — |
| Delaware Sustainable Energy Utility | Not stated | — |
| Town of Smyrna - (DE) | Municipal | — |
| MidAmerican Energy Services, LLC | Not stated | — |
| BP Energy Retail LLC | Not stated | — |
| NextEra Energy Services, LLC | Not stated | — |
The biggest Delaware utilities against the U.S.
- Delmarva Power (investor owned, 65% of Delaware customers in the file): SAIDI without major events 68 min, 61 below the U.S. 129; with major events 127 min against 662.
- Delaware Electric Cooperative (cooperative, 23% of Delaware customers in the file): SAIDI without major events 61 min, 68 below the U.S. 129; with major events 96 min against 662.
- City of Dover - (DE) (municipal, 5% of Delaware customers in the file): no reliability figures filed.
- City of Newark - (DE) (municipal, 3% of Delaware customers in the file): SAIDI without major events 84 min, 45 below the U.S. 129; with major events 84 min against 662.
- Town of Middletown - (DE) (municipal, 2% of Delaware customers in the file): no reliability figures filed.
Delaware by type of utility
Among Delaware utilities that report under IEEE 1366, cooperative utilities average 61 minutes without major events and municipal utilities 84.
| Type | Utilities | Customers | SAIDI without | Median utility | SAIDI with |
|---|---|---|---|---|---|
| Investor Owned | 1 | 337,507 | 68 | 68 | 127 |
| Cooperative | 1 | 117,394 | 61 | 61 | 96 |
| Municipal | 1 | 13,439 | 84 | 84 | 84 |
Next to Delaware in the ranking
Delaware report card
Smart meters: 100% of residential meters, 3 utilities (U.S. 92%). Delaware time-based rates: 2 of 4 utilities, 59.7% of residential customers enrolled (U.S. 10.6%). Delaware efficiency spend: $25,145.0 per customer (U.S. $124.2). Demand response: 173 W per customer (U.S. 77). Delaware net-metered systems: 28.8 per 1,000 customers. Rankings.
Is your Delaware utility better or worse than the Delaware median?
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- Delaware against all states
- Delaware utilities among the best and worst
- Delaware major outage reports from the Department of Energy
- Delaware electricity prices
- Delaware help with your bill
4 Delaware filings in EIA-861 2024 (retrieved 2026-10-01), 3 ranked utilities. Method and sources.
Questions
How many minutes without power did the average Delaware customer have in 2024?
67 minutes without major events and 118 with them (3 IEEE 1366 utilities, customer-weighted).
Why do the two Delaware numbers differ so much?
Major events add 51 of the 118 minutes (43%); Delmarva Power supplies 78% of the with-events total.
Which Delaware utility reported the fewest and the most minutes?
Among 3 utilities with 10,000+ customers: Delaware Electric Cooperative 61 minutes without major events, and City of Newark - (DE) 84.
Which Delaware utilities use which method?
3 follow IEEE 1366, 1 uses another method, 13 filed no reliability figures.