State · EIA Form 861 · IL
Illinois
According to the U.S. Energy Information Administration's EIA Form 861, SAIDI and SAIFI for Illinois utilities come from the federal annual survey. 17 utilities report reliability metrics; figures are customer-weighted state averages, not a guarantee for any single address.
Signature read: mid-cohort SAIDI between the 156 and 365 minute tercile cuts (51 states with averages).
EIA Form 861 · Continuity Brief
Illinois
EIA Form 861 Continuity Brief · August 2026 · IEEE 1366 SAIDI/SAIFI minutes, not a storm forecast.
Illinois sits mid-pack on SAIDI at 205.9 minutes across 17 EIA Form 861 utilities, spanning Rochelle Municipal Utilities lowest at 11.1 to Eastern Illinois Elec Coop highest at 613.9.
Named SAIDI peers (in-state best + nearest-state averages)
State SAIDI neighbourhood (minutes / customer-year)
- Illinois 205.9
- North Carolina 217.3
- Maryland 191.0
- Wisconsin 184.2
- Louisiana 240.8
- Connecticut 168.7
Lower is fewer interruption minutes. Neighbours are nearest other-state averages in this corpus.
Illinois vs all states by EIA Form 861 utility headcount
Where this state's reporting utility count sits among every state in the Form 861 file (coverage density, not reliability quality)
17 Top 45% more reporting utilities than 55% of 51 states
States, banded by electric utilities reporting on EIA Form 861
Each bar is a band; taller bars hold more states. 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 EIA Form 861 · 2026-08-30
Utilities Ranked by Reliability
All 17 electric utilities in Illinois with reliability data, sorted by 2023 SAIDI (fewest outage minutes first).
Lowest-SAIDI utilities in Illinois
Fewest outage minutes · live table sort
Top 10 Illinois utilities by fewest outage minutes. Lower SAIDI is better - not a quality score beyond interruption duration.
Lowest-SAIDI utilities in Illinois
| # | Utility | Type | SAIDI 2023 | SAIFI 2023 | Customers |
|---|---|---|---|---|---|
| 1 | Rochelle Municipal Utilities | Municipal | 11.1 | 0.29 | 7,443 |
| 2 | City of Naperville - (IL) | Municipal | 24.9 | 0.58 | 62,556 |
| 3 | Rock Energy Cooperative | Cooperative | 25.5 | 0.34 | 10,386 |
| 4 | City of Geneva- (IL) | Municipal | 39.2 | 0.90 | 10,215 |
| 5 | City of St Charles - (IL) | Municipal | 58.5 | 0.56 | 16,346 |
| 6 | City of Springfield - (IL) | Municipal | 62.5 | 0.89 | 70,331 |
| 7 | Commonwealth Edison Co | IOU | 93.3 | 0.61 | 3,242,491 |
| 8 | Jo-Carroll Energy, Inc | Cooperative | 175.3 | 0.71 | 20,253 |
| 9 | Southeastern IL Elec Coop, Inc | Cooperative | 204.9 | 1.80 | 24,796 |
| 10 | Mt Carmel Public Utility Co | IOU | 234.7 | 3.24 | 5,238 |
| 11 | Tri-County Electric Coop, Inc (IL) | Cooperative | 257.6 | 1.91 | 16,588 |
| 12 | Egyptian Electric Coop Assn | Cooperative | 262.3 | - | 15,412 |
| 13 | Southwestern Electric Coop Inc - (IL) | Cooperative | 374.5 | 2.74 | 25,140 |
| 14 | Corn Belt Energy Corporation | Cooperative | 392.9 | 4.54 | 36,995 |
| 15 | Menard Electric Coop | Cooperative | 446.7 | 2.47 | 10,961 |
| 16 | Ameren Illinois Company | IOU | 592.1 | 1.33 | 691,223 |
| 17 | Eastern Illinois Elec Coop | Cooperative | 613.9 | 2.06 | 13,502 |
Nationwide states with similar utility inventory or customer scale
Two cross-state peer sets for Illinois. Nearest-SAIDI neighbors stay in Read-with below; these neighborhoods compare EIA Form 861 headcount and summed customer accounts.
Similar utility headcount
Nearest states by reporting utility count (17 here).
Similar customer scale
Nearest states by summed customer accounts (4.3M here), excluding the headcount peer set.
Read with this Illinois roster
- Lowest published SAIDI in Illinois: Rochelle Municipal Utilities (11.1 min)
- Highest published SAIDI in Illinois: Eastern Illinois Elec Coop (613.9 min)
- Ownership mix here: Cooperative leads (9 of 17 utilities) · national type means
- Nearest avg SAIDI: North Carolina (217.3 min)
- Nearest avg SAIDI: Maryland (191.0 min)
- Nearest avg SAIDI: Wisconsin (184.2 min)
- Nearest avg SAIDI: Louisiana (240.8 min)
- Nearest avg SAIDI: Connecticut (168.7 min)
Source: U.S. Energy Information Administration (EIA) Form 861 Annual Electric Power Industry Report, reliability · 2020-2023 State averages are rebuilt from utility filings in this portal DB; corpus ranks use headcount and customer sums.