Wisconsin Power & Light Co

What This Utility Data Tells You

Wisconsin Power & Light Co is an investor-owned utility operating in Wisconsin under EIA identifier 20856. It reports service to approximately 497,000 customer accounts and generated about $1.35 billion in annual electric revenue, with a service footprint spanning 320 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.

In 2023, the average Wisconsin Power & Light Co customer experienced 106.5 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). 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 0.78, putting the typical customer at roughly 1 distinct interruption that year. Strip out major event days (hurricanes, ice storms) and SAIDI falls to 56.7 minutes; the difference from the headline 106.5 shows how much of the outage total came from weather rather than everyday grid issues.

The EIA dataset includes 4 years of continuous reporting (2020–2023) for Wisconsin Power & Light Co, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has increased from 92.8 to 106.5 minutes, which may reflect either worsening weather exposure or delayed grid modernization.