Compare tool · EIA Form 861 · 2023
Utility Reliability Comparison
Select a U.S. state and utility type to place its SAIDI/SAIFI against the customer-weighted national average from 918 EIA Form 861 reporters.
How to read the result
A state below the 341-minute national SAIDI spends less time without power than the customer-weighted U.S. average; SAIFI below 1.33 means fewer outages per year.
- 341 min
- National SAIDI w/ major events
- 119 min
- National SAIDI excluding MEDs
- 1.33
- National SAIFI outages/yr
- ~374
- IOU SAIDI avg (min/yr)
Benchmarks use the same global MAX(year) reliability cohort as state and utility pages. See methodology for refresh cadence.
Mean SAIDI by ownership (2023)
Mean SAIFI by ownership (same types)
Reliability Comparison
Understanding SAIDI and SAIFI
SAIDI (System Average Interruption Duration Index) measures the total minutes per year the average customer is without power. Lower is better. Across the utilities in this dataset, the current average is approximately 341 minutes/year (with major events) or 119 minutes/year (without major events).
SAIFI (System Average Interruption Frequency Index) counts how many times per year the average customer experiences a power outage. The average across this dataset is approximately 1.33 outages/year.
Averages By Utility Type (this dataset)
| Metric | IOU Average | Co-op Average | Municipal Avg |
|---|---|---|---|
| SAIDI (w/MED) | ~374 min/yr | ~476 min/yr | ~149 min/yr |
| SAIDI (nMED) | ~123 min/yr | ~202 min/yr | ~68 min/yr |
| SAIFI | ~1.47 /yr | ~2.25 /yr | ~1.09 /yr |
Per-type averages use the same global MAX(year) reliability cohort as state and utility pages, not a mixed per-utility latest year.
According to the U.S. Energy Information Administration (EIA), electric utilities publish SAIDI and SAIFI reliability metrics in Form 861 annual filings. Every figure on PlainUtility is rebuilt from those federal tables; no number is typed in by an editor. Comparator figures are computed directly from EIA Form 861 reliability files (same MAX(year) cohort as state and utility pages). See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of EIA Form 861 2023.