Columbia Power System - (TN)

What This Utility Data Tells You

Columbia Power System - (TN) is a municipally-owned utility operating in Tennessee under EIA identifier 3855. It reports service to approximately 35,567 customer accounts and generated about $0.08 billion in annual electric revenue, with a service footprint spanning 2 ZIP codes. As a municipal utility, it is typically governed by a local board or city council and is exempt from federal income tax.

In 2023, the average Columbia Power System - (TN) customer experienced 197.8 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). That lands within the usual 120–180 minute national benchmark band, roughly on par with typical U.S. distribution-utility performance. SAIFI, the average number of outage events per customer, was 2.35 for the same period, so customers statistically faced roughly 2 distinct interruptions that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 177.0 minutes, the gap between that figure and the headline 197.8 reveals how much weather, not day-to-day infrastructure, drove outages.

With 4 consecutive years of EIA data (2020–2023), Columbia Power System - (TN)'s reliability record can be judged on trend rather than one isolated year. SAIDI dropped from 988.6 to 197.8 minutes across that span, a direction regulators and prospective customers tend to watch closely.