IOU · Wisconsin · EIA 18336
Superior Water and Light Co
IOU · Wisconsin · 16K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 86 minutes/customer.
Reliability verdict
Superior Water and Light Co shows above-average chronic reliability in 2023: 17 minutes SAIDI excluding major events (86 minutes including them) across 16K customers.
- 86 min
- SAIDI 2023
- 1.24
- SAIFI 2023
- 17 min
- SAIDI ex-MED
- 16K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: short interruption minutes vs the 911 utility cohort (≤96 min tercile cut).
What short-outage Superior Water and Light Co filings show
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.
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.
86 min/year per customer
Power-out minutes per year (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Superior Water and Light Co from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Superior Water and Light Co SAIDI trend
Superior Water and Light Co vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
86 Lower than most fewer outage minutes than 70% 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 Superior Water and 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, Superior Water and Light Co charges more per customer than 98% of them, and is more reliable (lower SAIDI) than 73% 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: $5,504/year · Latest SAIDI: 86.1 minutes/year.
SAIDI 2023 breakdown: 86.1 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 55.7 | 39.6 | 0.530 | 14,708 |
| 2021 | 82.3 | 21.4 | 0.440 | 14,739 |
| 2022 | 99.6 | 35.7 | 0.640 | 14,878 |
| 2023 | 86.1 | 17.0 | 1.240 | 14,927 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Superior Water and Light Co serves 2 ZIP codes in Wisconsin.
Frequently Asked Questions
How reliable is Superior Water and Light Co?
Superior Water and Light Co had a SAIDI of 86.1 minutes in 2023 including major weather events, but 17.0 minutes excluding them (the IEEE-standard day-to-day reliability measure, the difference points to a major storm that year rather than an ongoing problem). Excluding major weather events, this is below the national average, indicating above-average reliability.
What type of utility is Superior Water and Light Co?
Superior Water and Light Co is classified as a IOU serving Wisconsin.
How many customers does Superior Water and Light Co serve?
Superior Water and Light Co serves approximately 16,180 customers in Wisconsin.
How has Superior Water and Light Co's reliability changed over time?
Superior Water and Light Co has 4 years of reliability data (2020-2023). SAIDI has held roughly steady across these years. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Wisconsin
- Customers
- 16,180
- Annual Revenue
- $0.09B
- EIA ID
- 18336
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Superior Water and 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 (16K here), outside Wisconsin.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (86.1 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.