Superior Water and Light Co

What This Utility Data Tells You

Superior Water and Light Co is an investor-owned utility operating in Wisconsin under EIA identifier 18336. It reports service to approximately 16,180 customer accounts and generated about $0.09 billion in annual electric revenue, with a service footprint spanning 2 ZIP codes. Investor ownership puts this utility under the regulatory authority of the state public utility commission, which reviews its rate requests and reliability record.

In 2023, the average Superior Water and Light Co customer experienced 86.1 minutes of power interruptions, the industry-standard SAIDI metric (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. Over the same period, SAIFI (outage events per customer) was 1.24, putting the typical customer at roughly 1 distinct interruption that year. Excluding major event days (hurricanes, ice storms), SAIDI drops to 17.0 minutes, the gap between that figure and the headline 86.1 reveals how much weather, not day-to-day infrastructure, drove outages.

With 4 consecutive years of EIA data (2020–2023), Superior Water and Light Co's reliability record can be judged on trend rather than one isolated year. SAIDI has increased from 55.7 to 86.1 minutes, which may reflect either worsening weather exposure or delayed grid modernization.