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Electric Power Annual

With Data for 2024 Release Date: October 16, 2025 Next Release: October 2026 full report PDF
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SAS Output
Table 11.3 Reliability Metrics Using Any Method of U.S. Distribution System by State, 2024 and 2023

  All Events (With Major Events) Without Major Events

Percent of Customers Reported SAIDI
(minutes per year)		 SAIFI
(times per year)		 CAIDI
(minutes per interruption)		 SAIDI
(minutes per year)		 SAIFI
(times per year)		 CAIDI
(minutes per interruption)
Census Division
and State		 Year 2024 Year 2023 Year 2024 Year 2023 Year 2024 Year 2023 Year 2024 Year 2023 Year 2024 Year 2023 Year 2024 Year 2023 Year 2024 Year 2023
New England 96.0% 94.2% 419.6 480.5 1.382 1.398 303.6 343.7 112.3 107.8 0.951 0.944 118 114.2
Connecticut 101.2% 100.6% 153.6 164.6 0.876 0.872 175.5 188.8 73.1 70.3 0.644 0.655 113.4 107.3
Maine 100.3% 100.8% 1748.6 1863 3.636 3.314 480.9 562.2 274 247.4 2.139 1.979 128.1 125
Massachusetts 92.3% 88.2% 102 259.4 0.843 1.057 120.9 245.4 76.1 82.2 0.743 0.78 102.3 105.4
New Hampshire 99.2% 99.3% 922.7 645.8 2.021 1.753 456.6 368.5 132.3 124.6 0.985 0.989 134.3 126.1
Rhode Island 97.6% 98.3% 104.3 104.6 0.896 0.782 116.4 133.7 60.8 52.2 0.761 0.667 79.9 78.3
Vermont 87.0% 87.0% 696.7 744.4 2.516 2.352 276.9 316.5 275 221.3 1.661 1.58 165.5 140
Middle Atlantic 97.6% 97.3% 246.2 159.5 1.099 0.883 224 180.7 97.2 89.9 0.804 0.736 120.9 122.2
New Jersey 100.9% 101.0% 174.2 108.3 1.119 0.881 155.7 123 99.7 88.5 0.948 0.831 105.2 106.5
New York 98.2% 97.7% 219.9 120 0.91 0.725 241.7 165.6 72 70 0.611 0.586 117.8 119.4
Pennsylvania 94.5% 94.4% 336.1 252.7 1.353 1.108 248.3 228 131 119.2 0.971 0.878 134.9 135.8
East North Central 95.9% 95.7% 349.2 472.8 1.155 1.177 302.2 401.6 112.8 107.1 0.868 0.804 130 133.3
Illinois 98.1% 97.8% 156.9 208.2 0.852 0.835 184 249.2 59.4 56.2 0.644 0.605 92.3 92.9
Indiana 92.0% 91.1% 312.4 455.4 1.283 1.447 243.5 314.8 121.4 110.3 0.997 0.946 121.8 116.6
Michigan 97.5% 97.4% 470.4 1093.6 1.356 1.512 346.8 723.5 160.1 162.7 0.986 0.921 162.4 176.7
Ohio 96.6% 96.5% 510.5 366.2 1.298 1.252 393.4 292.5 133.2 127 0.999 0.918 133.4 138.4
Wisconsin 92.3% 92.5% 266.1 183 1.02 0.877 260.8 208.6 91.3 72.4 0.729 0.631 125.2 114.7
West North Central 84.8% 84.9% 246.9 213.8 1.217 1.079 202.9 198.1 94.3 85.5 0.883 0.811 106.8 105.5
Iowa 85.4% 85.2% 166.7 104.9 1.15 0.907 145 115.7 89.8 70.4 0.887 0.709 101.3 99.3
Kansas 82.4% 82.5% 285.6 283.1 1.506 1.318 189.7 214.9 103.6 101.7 1.003 0.998 103.3 101.9
Minnesota 89.0% 88.7% 219.6 126.4 1.25 0.973 175.6 129.9 92.2 73.4 0.901 0.785 102.3 93.5
Missouri 86.7% 87.6% 224.3 371.8 1.189 1.315 188.6 282.9 106 106.7 0.919 0.876 115.3 121.7
Nebraska 73.7% 73.6% 641.7 72.6 1.232 0.558 520.8 130.1 73.6 56.8 0.595 0.48 123.8 118.3
North Dakota 88.5% 89.0% 99.1 208.6 0.915 1.055 108.4 197.7 84.2 89.9 0.857 0.907 98.3 99.1
South Dakota 75.4% 74.3% 84.7 77 0.815 1.011 104 76.2 62.1 63.2 0.72 0.894 86.2 70.8
South Atlantic 96.6% 96.7% 1247.3 227.4 1.785 1.344 698.7 169.3 129.3 117.5 1.042 1.082 124 108.6
Delaware 89.1% 89.0% 116.1 108.2 0.843 0.83 137.8 130.3 65.9 60.4 0.717 0.692 91.9 87.3
District of Columbia 98.9% 98.9% 32.6 71.9 0.271 0.37 120.2 194.2 26.4 33.3 0.246 0.318 107.2 104.6
Florida 100.4% 100.2% 1321.5 160.1 1.77 1.015 746.6 157.7 66.4 69.2 0.762 0.823 87.1 84.1
Georgia 88.9% 89.5% 1229.1 349.2 2.122 1.885 579.2 185.2 212.3 136.8 1.264 1.357 168 100.8
Maryland 98.6% 98.7% 118.1 166.2 0.817 0.92 144.5 180.7 75.1 66.9 0.686 0.703 109.6 95.1
North Carolina 96.0% 96.1% 1441 252 1.812 1.506 795 167.4 141.4 153.5 1.172 1.274 120.6 120.5
South Carolina 96.5% 95.6% 3136.5 167.2 2.365 1.507 1326.3 110.9 117.8 126.1 1.207 1.291 97.6 97.7
Virginia 96.4% 96.8% 418.3 221.1 1.627 1.461 257.1 151.3 166.4 159.3 1.342 1.283 124 124.2
West Virginia 97.3% 97.8% 1165.5 751.5 2.832 2.353 411.5 319.4 486.1 385.7 2.287 1.871 212.6 206.2
East South Central 86.5% 86.8% 415.7 715.5 2.03 2.256 204.7 317.2 162.8 168.7 1.493 1.51 109.1 111.7
Alabama 80.7% 80.0% 279.4 294.2 1.87 1.574 149.4 186.9 117.8 120.2 1.037 0.979 113.6 122.8
Kentucky 96.5% 96.6% 648.3 868.2 1.955 1.903 331.7 456.3 153.3 143.4 1.32 1.167 116.1 122.9
Mississippi 83.2% 83.6% 567.1 802.1 2.555 2.717 221.9 295.2 266.3 252.8 1.963 2.142 135.6 118
Tennessee 85.9% 87.0% 278.6 857.9 2 2.812 139.3 305.1 159.5 186.1 1.764 1.898 90.4 98.1
West South Central 96.1% 95.1% 1050.4 579.1 2.148 1.843 489 314.2 142.3 142 1.302 1.257 109.3 113
Arkansas 89.2% 89.3% 509.1 911.2 2.128 2.102 239.3 433.4 194.6 221.7 1.587 1.54 122.7 144
Louisiana 93.5% 93.6% 727.5 584.2 2.722 2.124 267.2 275.1 206 195 1.751 1.641 117.6 118.8
Oklahoma 90.6% 90.0% 270.9 896.6 1.731 1.862 156.5 481.6 119.6 139.3 1.147 1.143 104.3 121.8
Texas 98.1% 96.9% 1270.6 496.2 2.114 1.763 600.9 281.5 129.4 124.7 1.218 1.175 106.2 106.1
Mountain 93.3% 92.8% 181.3 120.2 1.192 0.989 152.1 121.6 105.8 91.7 0.979 0.863 108.1 106.3
Arizona 96.6% 96.7% 87.5 106.8 0.988 0.984 88.6 108.6 72 69.3 0.898 0.817 80.1 84.8
Colorado 93.7% 91.8% 255.1 99.2 1.409 0.915 181 108.3 119 88.4 1.142 0.865 104.3 102.2
Idaho 95.1% 94.9% 232.8 137.5 1.314 1.071 177.1 128.4 174 119.4 1.136 0.985 153.2 121.2
Montana 74.7% 75.0% 351.5 118.7 1.621 1.068 216.9 111.1 156.6 117.1 1.161 1.055 134.9 111
Nevada 103.1% 102.7% 158.9 138.7 1.108 0.942 143.4 147.2 63.8 81.2 0.658 0.745 97 108.9
New Mexico 90.1% 90.1% 278.8 168.9 1.321 1.242 211.1 136 156.5 132.3 1.109 0.997 141.1 132.7
Utah 88.3% 88.4% 119.8 127.1 1.03 0.916 116.3 138.7 106.7 109.8 0.966 0.879 110.4 124.9
Wyoming 76.0% 75.9% 137.8 127 0.999 0.994 138 127.8 109.1 96 0.869 0.77 125.6 124.7
Pacific Contiguous 98.5% 98.6% 365.4 294.2 1.413 1.284 258.7 229.2 155.8 144.6 1.117 1.027 139.5 140.8
California 100.0% 100.2% 279.6 346.6 1.345 1.397 208 248.1 158.2 152 1.154 1.086 137.1 140
Oregon 93.0% 92.9% 591 126.9 1.346 0.825 439.1 153.8 130.9 108 0.857 0.751 152.8 143.7
Washington 95.2% 95.1% 623.5 151.7 1.752 1.025 355.9 148 158.6 130.6 1.087 0.908 146 143.8
Pacific Noncontiguous 93.4% 93.6% 323 448.4 2.607 2.127 123.9 210.8 213.7 184.6 2.066 1.595 103.4 115.8
Alaska 84.2% 84.5% 327.1 374.8 2.591 2.701 126.3 138.8 192.4 325.7 1.862 2.366 103.3 137.6
Hawaii 99.9% 99.9% 320.6 491.8 2.616 1.788 122.6 275.1 225.6 148.6 2.18 1.398 103.5 106.3
U.S. Total 95.0% 94.8% 611.3 342 1.521 1.333 401.9 256.6 126 118.4 1.043 0.999 120.8 118.5

SAIDI = System Average Interruption Duration Index. It is the minutes of non-momentary electric interruptions, per year, the average customer experienced.
SAIFI = System Average Interruption Frequency Index. It is the number of non-momentary electric interruptions, per year, the average customer experienced.
CAIDI = Customer Average Interruption Duration Index. It is average number of minutes it takes to restore non-momentary electric interruptions.
Any method combines data from utilities that use IEEE standard with data from utilities that do not.
For utilities using the IEEE method, a Major Event Day is any day that exceeds a daily SAIDI threshold called Tmed. Tmed is a duration statistic calculated from
daily SAIDI values from the past five years. For utilities not using IEEE methods, Major Events are self-determined by the reporting utility.
Percent of Customers Reported is an estimate of the percentage of total customers covered by these metrics. The numerator is reported number of meters used on the reliability schedule,
while the denominator is the number of customers reported on the sales to ultimate customers schedule. It is possible, in some instances, for this metric to exceed 100%.
For a five minute video explanation of these metrics, go to https://youtu.be/oVH9L0fCMTU.
Source: U.S. Energy Information Administration, Form EIA-861, Annual Electric Power Industry Report.