PowerOutageHistory
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Clark County Power Outage History

2015–2025 · Nevada

Top 20% most reliable nationally — infrequent, short outages. How grades are calculated

Total events
3,429
Avg duration
2.4 hrs
Longest outage
104 hrs
National percentile
90th

Outages by year

Outages by month (seasonality)

Worst outage events on record

DateDurationCustomers affectedCause
Aug 12, 201857 hrs54,821 (5%)Hurricane John
Mar 30, 201746 hrs48,852 (5%)High Wind
Feb 13, 202141 hrs40,695 (4%)Thunderstorm Wind
Apr 16, 20160 hrs39,644 (4%)Flash Flood
Jul 1, 202556 hrs33,635 (3%)Heat

Over the 11 years from 2015 to 2025, Clark County recorded 3,429 distinct power outage events, averaging 2.4 hours per event.

The single worst outage on record in Clark County started August 12, 2018 (Hurricane John), lasting 57 hours and leaving up to 54,821 customers without power (5% of the county) at its peak.

July has historically been the worst month for outages in Clark County, with 464 events recorded during that month across the dataset.

Based on this history, Clark County earns a Reliability Grade of A, placing it in the 90th percentile nationally for grid reliability (higher percentile = more reliable).

Sized for Clark County's outage profile

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Similar counties in Nevada

Counties with the closest reliability grade and national percentile to Clark County.

CountyGradeNational percentile
Storey CountyA88th
Nye CountyA88th
Carson City CountyB71st
Churchill CountyB71st
Eureka CountyB64th

FAQ

How often does power go out in Clark County?

Between 2015 and 2025, Clark County recorded 3,429 outage events, averaging 2.4 hours each.

What is Clark County's reliability grade?

Clark County has a Reliability Grade of A, in the 90th national percentile.

What was the worst power outage in Clark County?

The worst outage on record started August 12, 2018 (Hurricane John), lasting 57 hours and affecting up to 54,821 customers.

Data: ORNL EAGLE-I Recorded Electricity Outages (2014–2025), CC BY 4.0. Storm names: NOAA Storm Events Database. Last data refresh: 2025. See methodology.