Wisconsin Public Service Corp

What This Utility Data Tells You

Wisconsin Public Service Corp is an investor-owned utility operating in Wisconsin under EIA identifier 20860. It reports service to approximately 463,129 customer accounts and generated about $1.24 billion in annual electric revenue, with a service footprint spanning 189 ZIP codes. Because it is investor-owned, the state public utility commission oversees its rate cases and reliability performance rather than a local board.

In 2023, the average Wisconsin Public Service Corp customer experienced 150.0 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). Excluding major weather events from that total, that places this utility well below the 120–180 minute national benchmark, signaling strong grid hardening and fast restoration practices. SAIFI, the average number of outage events per customer, was 0.85 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Once major event days (hurricanes, ice storms) are excluded, SAIDI comes down to 74.0 minutes, and the spread against the headline 150.0 indicates how much weather, versus routine infrastructure, drove the outage total.

Wisconsin Public Service Corp has 4 years of continuous EIA reporting on file (2020–2023), enough to read a real trend rather than a single-year snapshot. Over that span, SAIDI rose from 104.0 to 150.0 minutes, possibly reflecting tougher weather years or grid upgrades that have not caught up yet.