Data · filings covering 2024-01-01 through 2024-12-31

Grid Reliability Index

Utilities file two outage figures: one for an ordinary year, one that also counts the days a hurricane or an ice storm arrived. How far apart they sit varies. In 31 of the 51 jurisdictions here the storm-inclusive figure is at least twice the ordinary one; in 5 the two are within a quarter of each other. This index publishes both for every jurisdiction rather than picking one.

Quick read

Where 2024 was worst, storms did it

South Carolina averaged 53 hr without power once major events are counted, against 116 min when they are excluded — 27.2× the ordinary figure. Both are annual averages across that jurisdiction’s customers rather than the length of any one outage, so neither sizes a battery; the gap between them is what says how much of the year’s outage time arrived with major events.

Longest ordinary outages, 20248.1 hrWest Virginia · major events excluded Shortest ordinary outages, 202426 minDistrict of Columbia · major events excluded Worst with storms, 202453 hrSouth Carolina · major events included The other halfWhat solar offsets hereRates and modelled output by utility

How to read this

SAIDI is how many minutes the average customer spent without power over the year. SAIFI is how many separate times it happened. Utilities file both to the EIA twice over: once counting Major Event Days — the storms, ice, and fires that dominate a bad year — and once excluding them.

State figures are averages across the utilities that reported, weighted by how many customers each serves. They are not a measurement of any one address, and where only a handful of utilities reported, the average describes those filings rather than the state. The methodology page states the sources and the limits.

Every state, ordinary year and storm year

51 jurisdictions ordered by ordinary-year outage minutes, worst first. Neither outage column is an estimate of the other, and in 16 of these jurisdictions they do not rest on the same filings, because a utility published one variant and not the other. Each state page gives the count behind each figure.
State	Ordinary year	With major events	Interruptions	Utilities reporting	Behind each figure
West Virginia	8.1 hr	19 hr	2.3×	4	4 ordinary, 4 with major events
Mississippi	4.6 hr	10 hr	1.9×	13	12 ordinary, 13 with major events
Maine	4.6 hr	29 hr	2.1×	3	3 ordinary, 3 with major events
Virginia	4.1 hr	16 hr	1.6×	14	14 ordinary, 13 with major events
Vermont	3.9 hr	15 hr	1.4×	1 — too few to generalise	1 ordinary, 1 with major events
Hawaii	3.7 hr	6.4 hr	2.4×	1 — too few to generalise	1 ordinary, 1 with major events
Louisiana	3.6 hr	11 hr	1.7×	7	6 ordinary, 7 with major events
Georgia	3.5 hr	20 hr	1.2×	30	30 ordinary, 30 with major events
Arkansas	3.4 hr	8.8 hr	1.6×	15	15 ordinary, 15 with major events
Alaska	3.2 hr	5.4 hr	1.9×	5	5 ordinary, 5 with major events
Tennessee	2.8 hr	5.8 hr	1.8×	43	42 ordinary, 42 with major events
California	2.7 hr	4.8 hr	1.2×	22	21 ordinary, 21 with major events
Michigan	2.7 hr	8.0 hr	1.0×	20	20 ordinary, 20 with major events
Washington	2.6 hr	11 hr	1.1×	21	21 ordinary, 21 with major events
Texas	2.6 hr	27 hr	1.4×	50	49 ordinary, 50 with major events
Idaho	2.5 hr	3.4 hr	1.1×	8	8 ordinary, 8 with major events
Montana	2.5 hr	5.7 hr	1.2×	6	6 ordinary, 6 with major events
New Mexico	2.5 hr	4.5 hr	1.1×	9	8 ordinary, 9 with major events
Kentucky	2.4 hr	9.0 hr	1.2×	31	30 ordinary, 31 with major events
North Carolina	2.4 hr	25 hr	1.2×	36	35 ordinary, 36 with major events
New York	2.4 hr	8.0 hr	1.1×	4	4 ordinary, 4 with major events
Ohio	2.2 hr	8.5 hr	1.0×	30	30 ordinary, 30 with major events
Pennsylvania	2.2 hr	5.9 hr	1.0×	5	5 ordinary, 5 with major events
Oregon	2.1 hr	9.7 hr	0.8×	12	11 ordinary, 12 with major events
Indiana	2.1 hr	5.2 hr	1.0×	28	28 ordinary, 28 with major events
Oklahoma	2.0 hr	3.7 hr	1.3×	20	20 ordinary, 20 with major events
Alabama	2.0 hr	3.3 hr	1.3×	13	13 ordinary, 12 with major events
Colorado	119 min	4.3 hr	1.1×	21	21 ordinary, 21 with major events
Wyoming	116 min	2.3 hr	0.9×	7	7 ordinary, 7 with major events
South Carolina	116 min	53 hr	1.2×	22	22 ordinary, 22 with major events
Missouri	107 min	3.5 hr	0.9×	27	27 ordinary, 27 with major events
Utah	105 min	115 min	1.0×	9	8 ordinary, 9 with major events
Kansas	104 min	4.8 hr	1.0×	13	13 ordinary, 13 with major events
New Jersey	99 min	2.9 hr	0.9×	3	3 ordinary, 3 with major events
Wisconsin	98 min	4.9 hr	0.7×	25	25 ordinary, 25 with major events
Minnesota	91 min	3.7 hr	0.9×	38	36 ordinary, 38 with major events
North Dakota	87 min	103 min	0.9×	10	10 ordinary, 10 with major events
New Hampshire	84 min	12 hr	0.8×	3	3 ordinary, 3 with major events
Iowa	84 min	3.3 hr	0.8×	13	13 ordinary, 13 with major events
Massachusetts	77 min	104 min	0.7×	13	12 ordinary, 13 with major events
Maryland	75 min	118 min	0.7×	7	7 ordinary, 7 with major events
Connecticut	74 min	2.5 hr	0.6×	5	5 ordinary, 5 with major events
Arizona	70 min	84 min	0.9×	12	12 ordinary, 12 with major events
Nebraska	70 min	12 hr	0.6×	9	9 ordinary, 9 with major events
Delaware	67 min	118 min	0.7×	3	3 ordinary, 3 with major events
Florida	67 min	25 hr	0.7×	20	18 ordinary, 20 with major events
Nevada	64 min	2.6 hr	0.7×	5	5 ordinary, 5 with major events
South Dakota	62 min	86 min	0.7×	13	13 ordinary, 13 with major events
Rhode Island	61 min	104 min	0.8×	1 — too few to generalise	1 ordinary, 1 with major events
Illinois	59 min	2.6 hr	0.6×	16	13 ordinary, 16 with major events
District of Columbia	26 min	33 min	0.2×	1 — too few to generalise	1 ordinary, 1 with major events

What is behind these numbers

971 utilities filed the reliability form for 2024, and 747 of them published a usable figure. The other 224 filed without one; they are absent from these averages rather than counted as zero.

4 jurisdictions rest on fewer than 3 reporting utilities — District of Columbia, Hawaii, Rhode Island, Vermont — and their averages should be read as those filings, not as a survey of the state.

Source: U.S. Energy Information Administration, Form EIA-861 reliability file, data year 2024.