IOU · South Carolina · EIA 17539
Dominion Energy South Carolina, Inc
IOU · South Carolina · 789K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 118 minutes/customer.
Reliability verdict
Dominion Energy South Carolina, Inc shows above-average chronic reliability in 2023: 90 minutes SAIDI excluding major events across 789K customers.
- 118 min
- SAIDI 2023
- 1.48
- SAIFI 2023
- 90 min
- SAIDI ex-MED
- 789K
- 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 Dominion Energy South Carolina, Inc filings show
Dominion Energy South Carolina, Inc is an investor-owned utility operating in South Carolina under EIA identifier 17539. It reports service to approximately 788,721 customer accounts and generated about $2.41 billion in annual electric revenue, with a service footprint spanning 240 ZIP codes. Because it is investor-owned, the state public utility commission oversees its rate cases and reliability performance rather than a local board.
In 2023, the average Dominion Energy South Carolina, Inc customer experienced 117.5 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. That places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. SAIFI, the average number of outage events per customer, was 1.48 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 89.9 minutes, the gap between that figure and the headline 117.5 reveals how much weather, not day-to-day infrastructure, drove outages.
With 4 consecutive years of EIA data (2020–2023), Dominion Energy South Carolina, Inc's reliability record can be judged on trend rather than one isolated year. SAIDI has improved from 141.3 to 117.5 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.
118 min/year per customer
Minutes without power per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Dominion Energy South Carolina, Inc from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Dominion Energy South Carolina, Inc SAIDI trend
Dominion Energy South Carolina, Inc vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
118 Lower than most fewer outage minutes than 61% 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 Dominion Energy South Carolina, Inc sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Dominion Energy South Carolina, Inc charges more per customer than 76% of them, and is more reliable (lower SAIDI) than 65% of them, placing it in the quadrant where it pays more and is more reliable. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $3,061/year · Latest SAIDI: 117.5 minutes/year.
SAIDI 2023 breakdown: 117.5 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 141.3 | 88.2 | 1.400 | 760,086 |
| 2021 | 90.8 | 78.9 | 1.100 | 774,074 |
| 2022 | 232.0 | 78.4 | 1.930 | 786,570 |
| 2023 | 117.5 | 89.9 | 1.480 | 798,239 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Dominion Energy South Carolina, Inc serves 240 ZIP codes in South Carolina.
Frequently Asked Questions
How reliable is Dominion Energy South Carolina, Inc?
Dominion Energy South Carolina, Inc had a SAIDI of 117.5 minutes in 2023. Leaving aside major weather events, that figure comes in under the national average, pointing to above-average reliability.
What type of utility is Dominion Energy South Carolina, Inc?
Dominion Energy South Carolina, Inc is classified as a IOU serving South Carolina.
How many customers does Dominion Energy South Carolina, Inc serve?
Dominion Energy South Carolina, Inc serves approximately 788,721 customers in South Carolina.
How has Dominion Energy South Carolina, Inc's reliability changed over time?
Dominion Energy South Carolina, Inc 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
- South Carolina
- Customers
- 788,721
- Annual Revenue
- $2.41B
- EIA ID
- 17539
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Dominion Energy South Carolina, Inc. 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 (789K here), outside South Carolina.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (117.5 here), outside South Carolina, 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.