Reliability Outperforms National Averages Year-Over-Year
Members expect consistently reliable power from their electric utility. United Power has maintained a standard of excellence in system performance, delivering results that far exceed the national average year-over-year. The cooperative has continued to meet this standard while it navigated a power supply transition last year and is incorporating new, innovative projects that source and store power locally.
The cooperative’s exit from its wholesale power contract in May of 2024 meant bringing on new contracts from a mix of traditional and sustainable resources into the distribution system. Aside from celebrating United Power’s energy independence, the switch was successfully executed without any power disruptions, ensuring members can count on the cooperative to maintain its standards for reliability and resiliency across the distribution system.
United Power has collected 18 months of data since the transition, demonstrating consistent system reliability.
Measuring Reliability, By the Numbers
Electric utilities use a variety of key performance indicators to measure how effectively and efficiently their systems are operating. The most common indicator is known as the System Average Interruption Duration Index, or SAIDI. United Power also tracks the System Average Interruption Frequency Index, or SAIFI. These indicators are among the many used by utilities to analyze system performance and calculate outage expectations for an average member.
SAIDI is the measurement of cumulative outage time (in minutes) an average member would expect to experience over the course of a year. The national average across all electric utilities was 131 minutes in 2024 and nearly 240 minutes for cooperatives, according to the Energy Information Administration (EIA). United Power’s SAIDI score has stayed below 80 minutes each of the past three years and is just above 60 minutes through September of this year.
SAIFI measures the total number of outages an average member would expect to experience over the course of a year (frequency of outages experienced). United Power’s score of 0.90 in 2024 means the average meter experienced fewer than one outage throughout the year, again exceeding the national average across all electric utilities (1.07) and other cooperatives (1.61), per the EIA. Put another way, most United Power members were unlikely to experience more than one outage last year, and many did not experience an outage at all.
Another performance indicator used by utilities measures the system’s overall availability rate. The co-op’s three-year availability rate was between 98.8% and 99.9%.
“Our system’s performance is due to the great effort of our engineering and operations teams,” said Mark A. Gabriel, United Power’s President and CEO. “They are responsible for reviewing and interpreting data and developing strategies to improve the system. We are setting the standard for other utilities while meeting our members’ expectations.”
Building a Better System
United Power’s approach to maximizing system performance utilizes a comprehensive combination of design practices, proactive maintenance projects, and extensive integration of automated and smart field devices.
Outages are an intrinsic reality for electric utilities. United Power can mitigate them, but cannot guarantee they will not happen. Mitigation begins with building the system so that outages are recognized earlier, impact fewer members, and are restored quickly — and more importantly, safely. The cooperative designs the system with these steps in mind.
One of the ways this is accomplished is known as a “redundancy.” This essentially means that power can be rerouted from an alternate source to restore members during an outage while crews are investigating the cause or working on repairs. Most members are on a redundant system, which is part of why United Power’s average restoration times are also among the best in the country.
Another design strategy is “sectionalizing.” This means that when a fault results in an outage, depending on where it is located down the line, it may affect fewer members. Devices are installed in sections throughout the distribution system to limit outage impact.
United Power also deploys automated devices that collect system data. That information can help locate and clear faults to minimize outages and reduce restoration times or identify infrastructure that is not performing optimally and needs to be repaired. This data has been helpful in the cooperative’s maintenance plan, which proactively targets the worst-performing sections of the system to improve reliability and increase resiliency.
United Power outperforms other electric utilities across the various metrics used to evaluate system performance, but the cooperative regularly reviews emerging strategies and innovative technologies that can further improve reliability. Delivering safe and reliable power is the co-op’s core responsibility to members. You can be sure it is not taken lightly.