Power Out Map
– 0% of Gregory out 0 customers out in South Dakota

Power outage history

Gregory County South Dakota

1.2hours

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

82% below the national median

Worst outage on record Dec 16, 2022 11% of customers out · 90% back in 8.8 hours
Hours without power, average customer per year 1.2h / yr State average 4.8 h · national median 6.6 h
Major outages a year 3.0 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 9hours Median across major outages, from the peak
Longest single outage 24hours Jul 28, 2025, over 1% of customers out
Outage hours on storm days 83% Share falling on days with a NOAA storm report here
Worst year 2025 1.8 hours without power, average customer
Electricity customers 2,673 ORNL customer model · 2 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 Gregory'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

2025 was the worst well-recorded year, at 1.8 hours for the average customer. Hatched years have a thin record and are left out of the averages.

Gregory, hours without power per customer

GregoryUS median countySouth Dakota average
0 2 4 6 8 ’22 0.6 ’24 1.8 ’25 US 6.6 SD 4.8

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
Dec 16, 2022 Winter storm 300 11% 8.8 h 8.8 h 2.6k
Dec 15, 2022 Winter storm 300 11% 8.5 h 8.5 h 2.5k
Jul 28, 2025 Tornadoes 542 20% 24 h 16 h 2.5k
May 15, 2025 No storm report 268 10% 1.8 h 6.0 h 468
Sep 23, 2025 No storm report 159 6% 2.2 h 2.2 h 358
Dec 14, 2022 Winter storm 150 6% 2.0 h 2.0 h 300
Aug 29, 2025 No storm report 259 10% 48 min 48 min 194
Mar 28, 2025 No storm report 47 2% 3.0 h – 141
May 15, 2025 Thunderstorms 268 10% 30 min 30 min 134
Nov 20, 2024 Windstorm 129 5% 1.2 h – 132
May 9, 2025 No storm report 490 18% 12 min – 122
Aug 3, 2024 Heat 40 2% 2.5 h – 100

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 +6h

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

  • Winter storm 54%
  • Tornadoes 25%
  • No storm on record 17%
  • Windstorm 1.6%
  • Thunderstorms 1.6%
  • Heat 1.0%

Who keeps the lights on

Utilities serving Gregory

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Rosebud Electric Coop Inc Cooperative 141 78 0.77 11.9 4.9k
City of Burke SD – – – – 3.9k
WAPA-- Western Area Power Administration Federal – – – – –

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 Dakota

Where it is darkest

Hours / yr64+

All South Dakota 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 2,673 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 →