Power Out Map
– 0% of Barnwell out 0 customers out in South Carolina

Power outage history

Barnwell County South Carolina

8.9hours

without power for the average customer in a typical year, 2018–2025

20th most of 46 in South Carolina 1.4× the national median

Worst outage on record Hurricane Helene · Sep 27, 2024 61% of customers out · 90% back in 25 hours
Hours without power, average customer per year 8.9h / yr State average 9.6 h · national median 6.6 h
Major outages a year 3.3 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2hours Median across major outages, from the peak
Longest single outage 6.7days Hurricane Helene, over 1% of customers out
Outage hours on storm days 80% Share falling on days with a NOAA storm report here
Worst year 2024 35 hours without power, average customer
Electricity customers 10,628 ORNL customer model · 8 well-covered years

Every day since 2015

Eleven years, one night at a time

Each cell is a day. The brighter it is, the larger the share of Barnwell's customers who were without power at that day's worst moment.

20152016201720182019202020212022202320242025
0%100% of customers out

Year by year

Hours in the dark, per customer

2024 was the worst well-recorded year, at 35 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Barnwell, hours without power per customer

BarnwellUS median countySouth Carolina average
0 10 20 30 40 0.2 ’15 3.5 ’16 5.2 ’17 6.3 ’18 4.1 ’19 11 ’20 2.0 ’21 5.3 ’22 3.4 ’23 35 ’24 3.4 ’25 SC 9.6 US 6.6

The record

The biggest outages since 2015

Ranked by customer-hours lost: customers out multiplied by how long they stayed out. Times are local.

Began Storm Peak out Share Lasted 90% restored Customer-hours
Sep 27, 2024 Hurricane Helene 6,437 61% 6.7 d 25 h 349k
Apr 13, 2020 Tornadoes 7,897 74% 45 h 15 h 96k
Sep 11, 2017 Hurricane Irma 5,426 51% 36 h 14 h 41k
Oct 11, 2018 Hurricane Michael 3,500 33% 31 h 11 h 27k
Oct 8, 2016 Hurricane Matthew 4,839 46% 13 h 7.5 h 21k
May 6, 2022 Thunderstorms 4,125 39% 16 h 10 h 20k
Jun 23, 2018 No storm report 2,049 19% 8.0 h 5.5 h 16k
Jun 7, 2023 No storm report 946 9% 8.0 h 7.2 h 6.6k
May 12, 2025 No storm report 2,222 21% 3.5 h 2.0 h 6.5k
Oct 8, 2016 Hurricane Matthew 784 7% 17 h 18 h 6.5k
Apr 15, 2018 Thunderstorms 1,422 13% 6.5 h 18 h 5.6k
Oct 30, 2021 No storm report 874 8% 6.2 h 7.2 h 5.5k

After the peak

How fast the lights come back

Each line is one major outage, from its peak. The amber line is the typical path.

0% 25% 50% 75% 100% peak+24h+48h+72h+96h half back by +4h 90% by +10h

When it happens

The outage clock

Customer-hours out by month (rings, January innermost) and local hour, 2018–2025.

00061218 Jan inside

What was happening

Weather behind the outages

Each outage is matched to NOAA storm reports for Barnwell from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Tropical storm 58%
  • No storm on record 21%
  • Tornadoes 14%
  • Thunderstorms 6.4%
  • Windstorm 1.1%

Who keeps the lights on

Utilities serving Barnwell

As each utility reports to the Energy Information Administration for its whole South Carolina territory, not this county alone. Outage minutes include major storm days.

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Dominion Energy South Carolina, Inc Investor Owned 131 81 1.34 16.4 713k
Aiken Electric Coop Inc Cooperative 189 119 – 17.5 51k
Edisto Electric Coop, Inc Cooperative 236 236 – 19.0 16k

EIA Form 861, latest year each utility reported. Outage minutes are SAIDI, the yearly minutes the average customer goes without power; outages a year are SAIFI.

Next door

Neighbouring counties

Across South Carolina

Where it is darkest

Hours / yr64+

All South Carolina counties →

About these numbers

Notes

Outages come from the EAGLE-I record of utility outage maps collected every 15 minutes by Oak Ridge National Laboratory. Hours without power are customer-hours divided by the county's 10,628 electricity customers. Averages use well-covered years from 2018. Outages shorter than 15 minutes, and utilities that publish no outage map, are not in the record, so these figures understate the total. How every number is made →