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

Power outage history

McCormick County South Carolina

44hours

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

1st most of 46 in South Carolina 6.8× the national median

Worst outage on record Hurricane Helene · Sep 27, 2024 100% of customers out · 90% back in 13.0 days
Hours without power, average customer per year 44h / yr State average 9.6 h · national median 6.6 h
Major outages a year 13.5 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 14.6days Hurricane Helene, over 1% of customers out
Outage hours on storm days 77% Share falling on days with a NOAA storm report here
Worst year 2024 10.4 days without power, average customer
Electricity customers 4,091 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 McCormick'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 10.4 days for the average customer. Hatched years have a thin record and are left out of the averages.

McCormick, hours without power per customer

McCormickUS median countySouth Carolina average
0 20 40 60 80 100 4.8 ’15 1.0 ’16 39 ’17 13 ’18 18 ’19 7.6 ’20 9.1 ’21 14 ’22 19 ’23 249 ’24 25 ’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 4,091 100% 14.6 d 13.0 d 957k
Sep 11, 2017 Hurricane Irma 4,091 100% 2.3 d 36 h 123k
Jul 20, 2023 Thunderstorms 4,091 100% 28 h 23 h 38k
Jun 20, 2019 Thunderstorms 1,649 40% 3.1 d 9.5 h 30k
Jun 7, 2025 Thunderstorms 3,697 90% 25 h 8.8 h 29k
Jan 16, 2025 No storm report 2,597 63% 7.2 h 4.8 h 18k
Oct 4, 2015 No storm report 575 14% 2.2 d 2.1 d 15k
Sep 18, 2019 No storm report 2,042 50% 6.2 h 6.2 h 13k
Nov 5, 2024 No storm report 3,218 79% 6.8 h 4.5 h 11k
Jan 11, 2025 No storm report 526 13% 20 h 20 h 10k
Apr 8, 2025 No storm report 1,585 39% 5.8 h 5.8 h 9.1k
Jun 25, 2018 Thunderstorms 1,635 40% 9.8 h 6.2 h 8.8k

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 +6h 90% by +20h

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 McCormick from twelve hours before it began to its peak. Matching shows coincidence, not proof of cause.

  • Tropical storm 68%
  • No storm on record 23%
  • Thunderstorms 8.7%

Who keeps the lights on

Utilities serving McCormick

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
Duke Energy Carolinas, LLC Investor Owned 220 141 1.26 13.5 582k
Little River Electric Coop Inc SC – – – 15.0 151k
Aiken Electric Coop Inc Cooperative 189 119 – 17.5 51k
Town of McCormick SC – – – – 11k

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 4,091 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 →