SAIDI
122 min per year
Yearly outage minutes, on average (2023)
What This Utility Data Tells You
Delmarva Power is an investor-owned utility operating in Delaware under EIA identifier 5027. It reports service to approximately 299,234 customer accounts and generated about $0.58 billion in annual electric revenue, with a service footprint spanning 208 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.
In 2023, the average Delmarva Power customer experienced 122.0 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). Excluding major weather events from that total, that is comfortably under the 120–180 minute national benchmark range, a sign of solid grid resilience and quick outage response. The SAIFI figure, which tracks average outage events per customer, came in at 0.71 for the same period, meaning customers statistically saw about 1 distinct interruption that year. Once major event days (hurricanes, ice storms) are excluded, SAIDI comes down to 60.0 minutes, and the spread against the headline 122.0 indicates how much weather, versus routine infrastructure, drove the outage total.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Delmarva Power, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has improved from 272.0 to 122.0 minutes over that window, a meaningful direction for prospective customers and regulators watching capital investment outcomes.
SAIFI
0.71 interruptions/yr
Outage frequency (2023)
Customers
299,234
Customers across Delaware
SAIDI vs. National Average (180 min) 30.5%
122 min/year per customer
Annual minutes without electric service (2023)
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 272.0 | 77.0 | 1.070 | 323,671 |
| 2021 | 61.0 | 61.0 | 0.820 | 327,521 |
| 2022 | 78.0 | 65.0 | 0.710 | 330,683 |
| 2023 | 122.0 | 60.0 | 0.710 | 334,632 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Delmarva Power serves 208 ZIP codes in Delaware.
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Frequently Asked Questions
How reliable is Delmarva Power?
Delmarva Power had a SAIDI of 122.0 minutes in 2023 including major weather events, but 60.0 minutes excluding them (the industry-standard measure of routine reliability, so the gap traces back to a major storm that year, not a chronic issue). Excluding major storm impacts, this beats the national average, a sign of above-average reliability.
What type of utility is Delmarva Power?
Delmarva Power is classified as a IOU serving Delaware.
How many customers does Delmarva Power serve?
Delmarva Power serves approximately 299,234 customers in Delaware.
How has Delmarva Power's reliability changed over time?
Delmarva Power has 4 years of reliability data (2020-2023). SAIDI has held roughly steady across these years. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Delaware
- Customers
- 299,234
- Annual Revenue
- $0.58B
- EIA ID
- 5027
Explore
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer.
Every figure on PlainUtility is rendered directly from the U.S. Energy Information Administration's Form 861 reliability data, no number is typed in by an editor. This utility's SAIDI/SAIFI figures are rendered directly from EIA Form 861 reliability files. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2020-2023.