Johnson County, IA Power Outages
As of Nov 2, 11:30 PM EST, no power outages were reported in Johnson County, Iowa by MidAmerican Energy Co.
Johnson County on the Iowa outage map
- Normal
- Minor
- Moderate
- Major
- Severe
- Limited data
Current outages
Weather alerts
No active outage-relevant weather alerts from the National Weather Service.
Johnson County power outage history
Every significant outage recorded in Johnson County since late 2014, with likely causes from NOAA storm reports
Since late 2014, DOE's EAGLE-I monitoring system has recorded 204 significant power outages in Johnson County, meaning events that left at least 1% of customers in the dark. The largest (Aug 10–19, 2020) came when severe thunderstorms left 51,777 customers (66.6% of the county) without power.
From 2018 to 2025, the average customer here lost about 5 hr 34 min of power per year, close to the Iowa average of 5 hr 30 min. That ranks 25th of 99 Iowa counties for outage time, where 1st has the most.
August is the riskiest month: it accounted for 69% of all customer outage time from 2018 to 2025. On 25 days in that period, at least 5% of customers were out at the same time. Outage time in Johnson County has fallen recently: about 2 hr 1 min per customer per year in 2022–2025, versus 9 hr 7 min in 2018–2021.
The most recent significant outage on record (Dec 8, 2025) affected 2,278 customers (2.9%).
Worst outages on record
| # | When | Peak customers out | Days | Likely cause (NOAA) |
|---|---|---|---|---|
| 1 | Aug 10–19, 2020 | 51,777(66.6%) | 10 | Severe thunderstorms |
| 2 | Mar 10, 2017 | 42,670(54.9%) | 1 | Flooding |
| 3 | Jul 9–12, 2017 | 18,167(23.4%) | 4 | Hail and lightning |
| 4 | Nov 5, 2018 | 12,865(16.5%) | 1 | No major storm reported |
| 5 | Oct 11–12, 2016 | 12,594(16.2%) | 2 | Hail and lightning |
Hours without power per customer, by year
When outages happen
Source: DOE/ORNL EAGLE-I recorded electricity outages, 2014–2025 (CC BY 4.0), with likely causes from the NOAA NCEI Storm Events Database. EAGLE-I coverage was partial before 2018, so averages use 2018–2025. Peak counts are the highest number of customers out at one time.
Who provides electricity in Johnson County?
Electric companies with service territory in Johnson County (EIA-861, 2025)
| Utility | Type | Customers (IA) | Avg. outage time / yr | Live data |
|---|---|---|---|---|
| MidAmerican Energy | Investor Owned | 750,247 | Reporting | |
| Alliant Energy (Iowa) | Investor Owned | 506,498 | Not reporting | |
| Corridor Energy Cooperative | Cooperative | 35,447 | Not reporting | |
| Eastern Iowa Light & Power Coop | Cooperative | 24,200 | Not reporting | |
| East-Central Iowa Rural Elec Coop | Cooperative | 9,261 | Not reporting | |
| T I P Rural Electric Coop | Cooperative | 6,613 | Not reporting | |
| Farmers Electric Coop - (IA) | Cooperative | 650 | Not reporting |
Customer counts are each utility's statewide total in Iowa. Source: U.S. Energy Information Administration, Form EIA-861 & Electric Power Annual.
Local outage news
No Johnson County outage headlines in the past week.
Cities in Johnson County
Iowa, Coralville, North Liberty
Nearby counties
Johnson County power outage FAQ
Is the power out in Johnson County right now?
No outages are currently reported for Johnson County by participating utilities. If your power is out, report it to your electric company.
Which electric company serves Johnson County?
According to EIA-861 service territory data, MidAmerican Energy Co, Interstate Power and Light Co, Corridor Energy Cooperative, Eastern Iowa Light & Power Coop and 3 others provide electric service in Johnson County, Iowa.
What was the worst power outage in Johnson County?
The largest outage recorded by DOE's EAGLE-I system since 2014 was Aug 10–19, 2020. It peaked at 51,777 customers without power (66.6% of the county). NOAA storm reports for that period point to severe thunderstorms.
How often does the power go out in Johnson County?
EAGLE-I has recorded 204 significant outages here since late 2014. From 2018 to 2025 the average customer lost about 5 hr 34 min of power per year, and on 25 days at least 5% of customers were out at once.
Cite this page
You may reuse our derived data under CC BY 4.0 with attribution. Underlying government data is public domain.
PowerOutageTracker.com. "Johnson County, IA Power Outages." Accessed November 2, 2026. https://poweroutagetracker.com/outages/iowa/johnson-county