Power Out Map
– 0% of St. Louis out 0 customers out in Missouri

Power outage history

St. Louis County Missouri

3.8hours

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

42% below the national median

Worst outage on record Mar 14, 2025 14% of customers out · 90% back in 2.5 days
Hours without power, average customer per year 3.8h / yr State average 5.2 h · national median 6.6 h
Major outages a year 0.3 Peaks over 10% of customers or 50,000 customers
Typical time to restore 90% 2.3days Median across major outages, from the peak
Longest single outage 3.1days May 16, 2025, over 1% of customers out
Outage hours on storm days 93% Share falling on days with a NOAA storm report here
Worst year 2025 9.1 hours without power, average customer
Electricity customers 594,469 ORNL customer model · 4 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 St. Louis'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 9.1 hours for the average customer. Hatched years have a thin record and are left out of the averages.

St. Louis, hours without power per customer

St. LouisUS median countyMissouri average
0 2 4 6 8 10 12 1.9 ’15 6.3 ’16 0.6 ’17 2.9 ’18 2.9 ’19 0.6 ’20 ’21 9.1 ’25 US 6.6 MO 5.2

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
Mar 14, 2025 Thunderstorms 83,830 14% 2.9 d 2.5 d 2.2M
Jul 13, 2016 Thunderstorms 67,070 11% 2.3 d 2.1 d 1.7M
May 16, 2025 Thunderstorms 47,245 8% 3.1 d 3.2 d 1.5M
Jun 28, 2018 Thunderstorms 32,214 5% 40 h 45 h 663k
May 11, 2016 Thunderstorms 36,146 6% 25 h 25 h 382k
Apr 14, 2019 No storm report 28,721 5% 16 h 22 h 264k
Feb 24, 2016 No storm report 30,843 5% 13 h 13 h 260k
Jul 14, 2018 Thunderstorms 19,004 3% 9.0 h 15 h 104k
May 19, 2025 Thunderstorms 8,471 1% 12 h 22 h 87k
Aug 15, 2016 Flooding 13,214 2% 7.8 h 6.2 h 79k
Jul 17, 2019 Heat 14,859 3% 6.2 h 11 h 69k
Apr 26, 2016 Thunderstorms 15,599 3% 5.5 h 17 h 65k

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 +18h 90% by +50h

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

  • Thunderstorms 89%
  • No storm on record 7.4%
  • Windstorm 1.8%
  • Heat 1.5%

Who keeps the lights on

Utilities serving St. Louis

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

Utility Type Outage min / yr Excl. major storms Outages / yr Residential ¢/kWh Customers
Union Electric Co Investor Owned 594 119 1.18 13.3 1.1M

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 Missouri

Where it is darkest

Hours / yr64+

All Missouri 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 594,469 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 →