CoServ Scores with 99.99% Reliability Despite Severe Storms in 2025

By Nicholas Sakelaris | March 26, 2026

Tree Trimming (Vegetation Management) in Double Oak (Flower Mound border). Photos by KEN OLTMANN
Tree Trimming (Vegetation Management) in Double Oak (Flower Mound border). Photos by KEN OLTMANN

CoServ electric infrastructure persevered through several extreme weather events last year, finishing 2025 with another exceptional reliability score.

As in past years, CoServ Members could count on reliable power 99.99% of the time, according to the co-op’s 2025 outage metrics.

Utilities grade their reliability using the SAIDI (System Average Interruption Duration Index) score, which measures how many meters were off and for how long. The lower the score, the better. For 2025, CoServ’s SAIDI score was 31.1, meaning the average Member was without power around 31 minutes – though most Members didn’t experience any outages.

How Does CoServ Do It?

Preventive maintenance is the key to avoiding outages. Whether it’s the engineering designs, drone inspections, new smart grid technology, vegetation management, or line crews working in conjunction with System Operators, CoServ always goes the extra mile to prevent outages or restore power once they occur.

“Our 2025 SAIDI score is a direct result of Operations and Engineering groups working together to provide safe and reliable service to our Members,” said Shea Hassell, CoServ’s Vice President of Field Operations. “We have a well-designed and constructed system that is supported by strong preventative maintenance practices and highly effective storm response by our field personnel.”

The TripSaver II Recloser shown here will analyze a fault and make one of four decisions. It makes the overall grid smarter and increases reliability, reduces outages and improves SAIDI. We will be installing these all around the system over the next few years.
The TripSaver II Recloser shown here will analyze a fault and make one of four decisions. It makes the overall grid smarter and increases reliability, reduces outages and improves SAIDI. We will be installing these all around the system over the next few years.

Why Did the Number Go Up in 2025?

CoServ’s 2025 SAIDI score is in line with the past five years. Some Members might ask why it went up more than 8 points from 2024. A number of factors go into that, but one of the biggest differences was the increase in severe weather in 2025, said Jeremy Stephens, CoServ’s Control Center Manager.

Texas had more than 9,100 Dangerous Thunderstorm Alerts (DTA), more than twice as many as the next highest state, according to research by AEM (Advanced Environmental Modeling), an environmental insights firm. The DTAs are a proprietary metric that AEM uses to identify periods of exceptionally intense lightning rates associated with severe storms, AEM said in its report.

Motor vehicle accidents are another common cause of outages, as are wildlife incursions on our lines and equipment. Overall, there was a 10% increase in calls to System Operations and nearly a 20% increase in work orders in 2025 compared to the previous year.