Power Outage Data by State and Utility (EIA)

Outage minutes and frequency by state

State totals are EIA’s own “State Totals” sheet, which EIA includes in the files for data years 2023 onward. For 2013 to 2022 EIA’s files carry utility rows only, so this page shows state totals for 2023 to 2025 and leaves earlier years to the utility CSV. Customer counts differ a lot: the “any standard” totals cover everyone who reported under either the IEEE standard or another method, but not every utility reports.

What the measures mean (in EIA’s words)

EIA describes its reliability survey this way: “The data contain information on non-momentary electrical interruptions. If collected, utilities report the system average interruption duration index (SAIDI), the system average interruption frequency index (SAIFI), and the conditions under which these metrics are collected. We allow respondents to use IEEE standards or any other method.”

The instructions for Form EIA-861 define the two measures:

• “The system average interruption frequency index, or SAIFI, indicates how often the average customer experiences a sustained interruption (of over 5 minutes) over a predefined period of time.” SAIFI = [Sum of total number of customers interrupted over the year] / [Total number of customers served].
• “The system average interruption duration index, or SAIDI, indicates the total duration of interruption for the average customer over a predefined period of time.” SAIDI = [Sum of customer minutes interrupted over the year] / [Total number of customers served].

EIA’s files report each measure two ways, labeled with major event days (all events) and without major event days. EIA’s instructions ask utilities that follow the IEEE 1366 standard to report “Annual Distribution SAIDI Including Major Event Days” and “Annual Distribution SAIDI Excluding Major Event Days”, and the same two versions for SAIFI. EIA’s instructions do not define a major event day beyond pointing to the IEEE 1366 standard, so we do not either. The “without” figure is the one with those days left out, and the “with” figure is the one a hurricane or ice storm moves most. EIA’s files also carry a CAIDI column, which EIA’s sheet notes define as SAIDI divided by SAIFI. Source: the Form EIA-861 instructions inside EIA’s data-year zip files. SAIDI in these files is in minutes a year and SAIFI in interruptions a year.

Two cautions that come from EIA’s own description: utilities may use the IEEE method or “any other method”, and EIA’s sheets keep those columns apart, so utility-to-utility comparisons are rougher than state averages. Momentary interruptions are not counted.

Utilities, 2025 data

The table below lists each utility that reported at least one measure. Use the search box to find yours.