IOU · Wisconsin · EIA 20856
Wisconsin Power & Light Co
IOU · Wisconsin · 497K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 107 minutes/customer.
Reliability verdict
Wisconsin Power & Light Co shows above-average chronic reliability in 2023: 57 minutes SAIDI excluding major events across 497K customers.
- 107 min
- SAIDI 2023
- 0.78
- SAIFI 2023
- 57 min
- SAIDI ex-MED
- 497K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: mid-cohort SAIDI between the 96 and 258 minute tercile cuts.
What mid-pack Wisconsin Power & Light Co filings show
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.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
107 outage minutes per customer annually
Power-out minutes per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Wisconsin Power & Light Co from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Wisconsin Power & Light Co SAIDI trend
Wisconsin Power & Light Co vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
107 Lower than most fewer outage minutes than 64% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where Wisconsin Power & Light Co sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Wisconsin Power & Light Co charges more per customer than 61% of them, and is more reliable (lower SAIDI) than 68% of them, placing it in the quadrant where it pays more and is more reliable. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $2,724/year · Latest SAIDI: 106.5 minutes/year.
SAIDI 2023 breakdown: 106.5 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI |
|---|---|---|---|
| 2020 | 92.8 | 73.6 | 0.710 |
| 2021 | 112.5 | 80.8 | 0.740 |
| 2022 | 145.8 | 82.8 | 0.870 |
| 2023 | 106.5 | 56.7 | 0.780 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Wisconsin Power & Light Co serves 320 ZIP codes in Wisconsin.
Frequently Asked Questions
How reliable is Wisconsin Power & Light Co?
Wisconsin Power & Light Co had a SAIDI of 106.5 minutes in 2023. Excluding major storm impacts, this beats the national average, a sign of above-average reliability.
What type of utility is Wisconsin Power & Light Co?
Wisconsin Power & Light Co is classified as a IOU serving Wisconsin.
How many customers does Wisconsin Power & Light Co serve?
Wisconsin Power & Light Co serves approximately 497,000 customers in Wisconsin.
How has Wisconsin Power & Light Co's reliability changed over time?
Wisconsin Power & Light Co has 4 years of reliability data (2020-2023). SAIDI has remained relatively stable over this period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Wisconsin
- Customers
- 497,000
- Annual Revenue
- $1.35B
- EIA ID
- 20856
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Wisconsin Power & Light Co. Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (497K here), outside Wisconsin.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (106.5 here), outside Wisconsin, excluding the customer-peer set.
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer · methodology.