IOU · Delaware · EIA 5027
Delmarva Power
IOU · Delaware · 299K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 122 minutes/customer.
Reliability verdict
Delmarva Power shows above-average chronic reliability in 2023: 60 minutes SAIDI excluding major events (122 minutes including them) across 299K customers.
- 122 min
- SAIDI 2023
- 0.71
- SAIFI 2023
- 60 min
- SAIDI ex-MED
- 299K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: mid-cohort SAIDI between the 96 and 258 minute tercile cuts.
What mid-pack Delmarva Power filings show
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.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
122 min/year per customer
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Delmarva Power from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Delmarva Power SAIDI trend
Delmarva Power vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
122 Lower than most fewer outage minutes than 60% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where Delmarva Power sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Delmarva Power charges more per customer than 12% of them, and is more reliable (lower SAIDI) than 63% of them, placing it in the quadrant where it pays less while still being more reliable, the best-value quadrant. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $1,954/year · Latest SAIDI: 122.0 minutes/year.
SAIDI 2023 breakdown: 122.0 minutes
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.
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
Utilities with similar EIA profiles
Two cross-state peer sets for Delmarva Power. Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (299K here), outside Delaware.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (122.0 here), outside Delaware, excluding the customer-peer set.
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 · methodology.