Power outages in Johnston, IA

Live outages for Johnston and the surrounding area, updated every 10 minutes. Johnston has 25,065 residents.

Right now

Outages reported

Normal: fewer than 0.1% of customers out. Elevated: 0.1% or more. Major outage: 1% or more.

10customers without power in Polk County

A customer is one electric account, usually one home or business, not one person. Utilities count outages this way.

Share of customers unknown

At least one utility here doesn't publish how many customers it serves in this area, so we can't show a percentage.

Updated 7 min ago

We check every utility's outage data every 10 minutes. Each utility updates its own map on its own schedule, usually every 5 to 15 minutes.

MidAmerican Energy doesn't publish a count for Johnston itself; see its ZIP codes below.

Outage map

JohnstonPolk CountyMidAmerican Energy publishes totals only, not outage locations.

Some utilities publish only how many customers are out, not where. Their outages are in the counts but can't be drawn on the map.

Outage history in Polk County, which includes Johnston

2014–2025 record

Polk County averaged 14.7 significant outages a year in 2023–2025, about typical for Iowa counties.

In the 12 months to December 2025, there were 13. Half were over within 2 hours; the longest lasted 14 hours, starting July 11, 2025.

The largest on record began August 10, 2020, with 114,873 customers out at once.

Outages are most common in August.

14.7significant outages a year (2023–2025)

At least 1% of the area's customers, and at least 100, without power at the same time. Outages less than 6 hours apart count as one.

45 minutestypical (median) length

Half of significant outages here ended sooner than this, and half lasted longer.

5.3 dayslongest on record (August 2020)

114,873most customers out at once

Largest events (start)	Peak out	Lasted i How long this area stayed at or above the significant-outage line, not how long any one home was without power.	Customer-hours i Customers out multiplied by hours out, added up over the event. 1,000 customers out for 3 hours is 3,000 customer-hours.
August 10, 2020	114,873	5.3 days	5,563,937
May 21, 2024	26,999	22 hours	196,977
May 24, 2024	26,759	7 hours	73,803
July 28, 2025	24,009	7 hours	88,009
July 1, 2018	19,193	8.5 hours	87,647

Recorded outages from EAGLE-I, Oak Ridge National Laboratory (CC BY 4.0).

From EAGLE-I, Oak Ridge National Laboratory's record of utility outage data every 15 minutes since 2014 (CC BY 4.0). It covered about 9 in 10 U.S. customers.

If your power is out

Report it to your utility

MidAmerican Energy: outage map and reporting
Stay at least 35 feet from downed power lines and report them right away.

Food safety

0–4 hKeep the fridge closed. It keeps food cold for about 4 hours.
4 h+Throw out meat, dairy and leftovers that have been above 40°F for more than 2 hours.
24 hA half-full freezer holds about 24 hours if kept closed.
48 hA full freezer holds about 48 hours.

Generators, heat and cold

Run generators outside only, at least 20 feet from windows and doors. Never in a garage.
Use a battery-powered carbon monoxide alarm.
Never heat your home with a gas stove or oven.