IOU · Wisconsin · EIA 20860

Wisconsin Public Service Corp

IOU · Wisconsin · 463K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 150 minutes/customer.

Reliability detail ↓ Wisconsin utilities

Reliability verdict

Wisconsin Public Service Corp shows above-average chronic reliability in 2023: 74 minutes SAIDI excluding major events (150 minutes including them) across 463K customers.

150 min
SAIDI 2023
0.85
SAIFI 2023
74 min
SAIDI ex-MED
463K
Customers

Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.

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Signature read: mid-cohort SAIDI between the 96 and 258 minute tercile cuts.

What mid-pack Wisconsin Public Service Corp filings show

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.

C+
Reliability Score
62/100
Wisconsin Public Service Corp · 3 of 3 dimensions reported

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.

Baseline Reliability C+ 74.0 min/yr
SAIDI excluding major-event days — day-to-day grid performance
Total Outage Duration C- 150.0 min/yr
SAIDI including storms and major events — the full-year experience
Outage Frequency B- 0.85/yr
SAIFI — average number of interruptions per customer per year
SAIDI vs. national mean (341 min) 20.0%

150 min/year per customer

Wisconsin Public Service Corp SAIDI

Power-out minutes per year (2023)

150 SAIDI150 SAIDINat. avg 341341SAIDI150SAIDI

Excellent

SAIDI by year (2020-2023)

Minutes per customer-year · EIA Form 861

Year-by-year SAIDI for Wisconsin Public Service Corp from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.

Source: U.S. EIA Form 861 As of August 2026

Wisconsin Public Service Corp SAIDI trend

0 100 200 300 400 500 600 2020 2021 2022 2023 104 555 462 150
Year-by-year SAIDI from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.

Wisconsin Public Service Corp vs the nationwide SAIDI distribution

Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure

150 Lower than most fewer outage minutes than 53% 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 Public Service Corp 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 Public Service Corp charges more per customer than 59% of them, and is more reliable (lower SAIDI) than 57% 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.

Wisconsin Public Service Corp vs. a 40-utility national peer sample, price percentile vs. reliability percentile. Scatter plot of 41 data points (bubble-sized by third dimension). 050100150 050100150 Best valuePays for itCheap + riskyWorst deal Price percentile Reliability percentile Point, Price percentile: 0 · Reliability percentile: 30Point, Price percentile: 3 · Reliability percentile: 40Point, Price percentile: 5 · Reliability percentile: 32Point, Price percentile: 8 · Reliability percentile: 80Point, Price percentile: 10 · Reliability percentile: 45Point, Price percentile: 13 · Reliability percentile: 87Point, Price percentile: 15 · Reliability percentile: 12Point, Price percentile: 18 · Reliability percentile: 25Point, Price percentile: 20 · Reliability percentile: 17Point, Price percentile: 23 · Reliability percentile: 77Point, Price percentile: 25 · Reliability percentile: 10Point, Price percentile: 28 · Reliability percentile: 52Point, Price percentile: 30 · Reliability percentile: 62Point, Price percentile: 33 · Reliability percentile: 60Point, Price percentile: 35 · Reliability percentile: 7Point, Price percentile: 38 · Reliability percentile: 0Point, Price percentile: 40 · Reliability percentile: 72Point, Price percentile: 43 · Reliability percentile: 2Point, Price percentile: 45 · Reliability percentile: 20Point, Price percentile: 48 · Reliability percentile: 15Point, Price percentile: 50 · Reliability percentile: 43Point, Price percentile: 53 · Reliability percentile: 37Point, Price percentile: 55 · Reliability percentile: 97Point, Price percentile: 57 · Reliability percentile: 100Point, Price percentile: 60 · Reliability percentile: 5Point, Price percentile: 65 · Reliability percentile: 70Point, Price percentile: 68 · Reliability percentile: 92Point, Price percentile: 70 · Reliability percentile: 75Point, Price percentile: 73 · Reliability percentile: 55Point, Price percentile: 75 · Reliability percentile: 47Point, Price percentile: 78 · Reliability percentile: 90Point, Price percentile: 80 · Reliability percentile: 22Point, Price percentile: 83 · Reliability percentile: 95Point, Price percentile: 85 · Reliability percentile: 35Point, Price percentile: 88 · Reliability percentile: 27Point, Price percentile: 90 · Reliability percentile: 82Point, Price percentile: 93 · Reliability percentile: 65Point, Price percentile: 95 · Reliability percentile: 85Point, Price percentile: 98 · Reliability percentile: 67Point, Price percentile: 100 · Reliability percentile: 57Wisconsin Public Service Corp, Price percentile: 59 · Reliability percentile: 57
Wisconsin Public Service Corp vs. a 40-utility national peer sample, price percentile vs. reliability percentile.

Revenue per customer: $2,675/year · Latest SAIDI: 150.0 minutes/year.

SAIDI 2023 breakdown: 150.0 minutes

Reliability Trend (2020–2023)

Year SAIDI (min) SAIDI nMED SAIFI Customers
2020 104.0 104.0 0.940 455,242
2021 555.0 95.0 1.460 459,018
2022 462.0 96.0 1.450 463,921
2023 150.0 74.0 0.850 466,253

SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.

Service Area

Wisconsin Public Service Corp serves 189 ZIP codes in Wisconsin.

530145301553020530425304953061530635308854101541025410354104541105411254114541155411954120541215412454125541265412954130541375413854139541415414354149541505415154153541545415554156541575415954160541615416254165541715417354174541755417754180542015420254204542055420754208542095421054211542125421354214542165421754220542265422754228542295423054232542345423554240542415424554247543015430254303543045430554306543075430854311543135432454344544015440254403544065440754408544095441154412544145441654417544185442354424544265442754428544355444054442544435444854449544525445454455544595446254463544645446554467544705447154473544745447554476544815448254484544855448754488544915449254494544995450154511545125451354514545195452054521545295453154532545385453954540545415454254543545455454754548545525455454557545585456054561545625456454566545685490154902549035490454906549095492154927549325494654947549565496254963549645496654971549775497954981549835498554986

Frequently Asked Questions

How reliable is Wisconsin Public Service Corp?

Wisconsin Public Service Corp had a SAIDI of 150.0 minutes in 2023 including major weather events, but 74.0 minutes excluding them (the industry-standard measure of routine reliability, so the gap traces back to a major storm that year, not a chronic issue). Leaving aside major weather events, that figure comes in under the national average, pointing to above-average reliability.

What type of utility is Wisconsin Public Service Corp?

Wisconsin Public Service Corp is classified as a IOU serving Wisconsin.

How many customers does Wisconsin Public Service Corp serve?

Wisconsin Public Service Corp serves approximately 463,129 customers in Wisconsin.

How has Wisconsin Public Service Corp's reliability changed over time?

Wisconsin Public Service Corp has 4 years of reliability data (2020-2023). This utility's SAIDI has stayed fairly flat over the period. Review the trend table above for year-by-year detail.

Utility Profile

Type
IOU
State
Wisconsin
Customers
463,129
Annual Revenue
$1.24B
EIA ID
20860

Explore

Utilities with similar EIA profiles

Two cross-state peer sets for Wisconsin Public Service Corp. 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 (463K here), outside Wisconsin.

NSTAR Electric Company 464K · MA Metropolitan Edison Co 460K · PA Entergy Mississippi LLC 460K · MS Pennsylvania Electric Co 469K · PA

Similar chronic SAIDI

Nearest utilities by latest SAIDI minutes (150.0 here), outside Wisconsin, excluding the customer-peer set.

HILCO Electric Cooperative, Inc. 149.8 min · TX PPL Electric Utilities Corp 149.7 min · PA Hawaiian Electric Co Inc 149.5 min · HI Interstate Power and Light Co 149.4 min · IA

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.