Table 11.2 Reliability Metrics Using IEEE of U.S. Distribution System by State, 2023 and 2022

  All Events (With Major Event Days) Without Major Event Days Loss of Supply Removed

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)
SAIDI
(minutes per year)
SAIFI
(times per year)
CAIDI
(minutes per interruption)
Census Division
and State
Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022 Year 2023 Year 2022
New England 83.3% 85.5% 489.3 309.3 1.368 1.341 357.7 230.7 103.4 98.2 0.919 0.972 112.5 101 481.2 349.9 1.298 1.333 370.7 262.4
Connecticut 79.0% 78.5% 193.4 187.4 0.911 0.905 212.4 207 77.7 73.7 0.681 0.673 114 109.4 188.2 187.1 0.876 0.897 214.9 208.5
Maine 100.8% 102.7% 1863 963.6 3.314 3.001 562.2 321.1 247.4 216.7 1.979 1.956 125 110.8 1781.4 930.7 3.015 2.786 590.9 334.1
Massachusetts 86.0% 90.9% 265.3 165.8 1.069 1.093 248.2 151.7 83.5 84.4 0.79 0.897 105.7 94 268.5 186.4 1.025 0.997 262 186.9
New Hampshire 88.2% 88.2% 590.6 495.5 1.485 1.417 397.7 349.6 89.3 78.2 0.766 0.7 116.6 111.8 587.7 487.4 1.48 1.383 397.2 352.5
Rhode Island 98.3% 98.2% 104.6 81.9 0.782 0.959 133.7 85.4 52.2 63.2 0.667 0.808 78.3 78.2 100.8 81.1 0.736 0.932 136.9 87
Vermont 10.4% 10.5% 486.3 914.6 2.25 2.44 216.1 374.8 204.3 178.5 1.38 1.95 148.1 91.5 480.1 877.6 2.04 2.26 235.3 388.3
Middle Atlantic 58.8% 58.7% 196.8 184.7 1.041 1.102 189 167.7 112.2 111.7 0.89 0.952 126.1 117.3 185.9 176.3 0.951 1.017 195.5 173.3
New Jersey 99.3% 99.2% 108.2 89.6 0.88 0.876 122.9 102.3 88 78.7 0.83 0.838 106 94 99.2 81.4 0.783 0.776 126.8 104.9
New York 20.0% 20.1% 204.8 347.7 1.127 1.466 181.7 237.2 130.1 150 0.963 1.162 135.1 129.1 207.5 354 1.14 1.489 182 237.7
Pennsylvania 84.3% 84.1% 265.1 207.5 1.143 1.163 232 178.3 125.9 125.4 0.914 0.975 137.7 128.6 248.3 195.1 1.025 1.059 242.3 184.2
East North Central 91.0% 90.8% 489.5 319.7 1.187 1.212 412.3 263.8 108.8 121.4 0.808 0.931 134.6 130.4 483.4 288.6 1.113 1.09 434.5 264.8
Illinois 96.3% 95.8% 210.4 90.8 0.833 0.756 252.4 120.2 56.2 59.1 0.604 0.643 93 91.9 209.9 89.2 0.819 0.745 256.4 119.8
Indiana 83.4% 83.3% 467.4 276.5 1.414 1.427 330.6 193.7 111.3 139.9 0.944 1.136 118 123.2 462.1 217.6 1.292 1.229 357.6 177
Michigan 94.2% 94.1% 1127.7 520.7 1.543 1.34 730.9 388.7 164.8 166.8 0.931 1.016 177.1 164.2 1131.2 519.9 1.533 1.326 738 391.9
Ohio 96.4% 96.2% 366.6 413.6 1.252 1.518 292.7 272.4 127.1 144.1 0.918 1.122 138.4 128.5 336 318.9 1.075 1.204 312.6 264.8
Wisconsin 74.5% 74.3% 203.8 307.9 0.913 1.101 223.3 279.6 76.8 104.7 0.633 0.763 121.4 137.3 200.9 305.2 0.881 1.053 228 289.8
West North Central 76.2% 75.9% 222.7 202.8 1.093 1.107 203.8 183.2 84.6 90.1 0.811 0.868 104.3 103.9 215.6 191.7 0.973 0.98 221.5 195.7
Iowa 52.8% 52.8% 83.9 95 0.859 0.978 97.7 97.2 60.7 78.2 0.645 0.837 94.1 93.5 75.5 80.1 0.741 0.76 101.9 105.4
Kansas 80.1% 79.7% 287.1 178.3 1.327 1.321 216.3 134.9 101.8 108.1 1.004 1.087 101.4 99.5 274.4 157.9 1.171 1.143 234.3 138.2
Minnesota 86.7% 86.6% 127.1 275.2 0.973 1.207 130.6 228 72.8 81 0.778 0.846 93.6 95.8 123.6 270.3 0.859 1.101 143.9 245.5
Missouri 83.6% 83.1% 379 149.5 1.324 1.057 286.1 141.5 104.4 97 0.878 0.879 118.9 110.3 391.2 144.2 1.263 0.985 309.8 146.3
Nebraska 67.0% 66.1% 69.4 73 0.555 0.59 125.2 123.8 55.6 56.2 0.478 0.534 116.2 105.2 66.4 71.1 0.545 0.573 121.8 124
North Dakota 63.2% 63.2% 262.3 677.6 1.151 1.425 227.9 475.5 93.9 102.8 0.942 1.065 99.7 96.6 259 789.8 0.843 1.126 307.2 701.2
South Dakota 67.9% 67.8% 78.1 338.3 1.017 1.204 76.8 281.1 63.9 126.3 0.894 0.793 71.4 159.4 62.2 244.7 0.691 0.89 90.1 274.9
South Atlantic 81.7% 80.2% 240.4 615.8 1.341 1.662 179.4 370.5 119.7 127.9 1.071 1.097 111.9 116.6 211.7 635 1.176 1.526 180 416.1
Delaware 87.4% 87.1% 109.7 79.8 0.842 0.853 130.4 93.5 61.2 66.4 0.701 0.767 87.2 86.5 112.1 80.8 0.858 0.864 130.6 93.4
District of Columbia 98.9% 98.2% 71.9 33.7 0.37 0.302 194.2 111.5 33.3 26.3 0.318 0.277 104.6 95.1 71.9 33.7 0.37 0.302 194.2 111.5
Florida 84.4% 83.7% 172.3 1011.3 0.982 1.463 175.5 691.2 69.4 69.8 0.78 0.833 89 83.8 160 1012.6 0.929 1.408 172.3 719.3
Georgia 87.8% 86.1% 342.7 212.4 1.858 1.668 184.5 127.3 133.4 129.3 1.336 1.291 99.9 100.2 300.3 185.2 1.765 1.544 170.1 119.9
Maryland 98.7% 98.1% 166.2 260 0.92 1.16 180.7 224.2 66.9 84.2 0.704 0.84 95.1 100.2 156.1 224.6 0.882 1.055 176.9 213
North Carolina 88.5% 86.5% 262.5 486 1.526 1.97 172.1 246.7 156.4 150.7 1.282 1.238 121.9 121.6 249.9 423.1 1.399 1.788 178.6 236.6
South Carolina 92.2% 92.0% 169.8 302.4 1.512 1.87 112.3 161.7 126.5 114.8 1.289 1.154 98.1 99.4 140.4 274.4 1.197 1.571 117.3 174.7
Virginia 30.8% 26.5% 292.8 1108.2 1.655 2.541 176.9 436.1 239.9 342.3 1.522 1.838 157.6 186.2 280.6 1103.6 1.561 2.444 179.8 451.6
West Virginia 97.8% 98.1% 751.5 1003.2 2.353 2.737 319.4 366.5 385.7 543.6 1.871 2.225 206.2 244.3 700.4 850.9 2.1 2.251 333.5 378
East South Central 61.5% 62.0% 864.3 392.5 2.408 2.505 359 156.7 186.5 187.8 1.626 1.691 114.7 111 876.2 393 2.332 2.332 375.6 168.6
Alabama 14.3% 14.4% 400.2 231.3 2.281 2.28 175.4 101.4 189.5 198.4 1.481 1.973 128 100.6 380.2 230.1 1.972 2.151 192.8 106.9
Kentucky 93.2% 93.0% 861.5 345.5 1.859 1.707 463.4 202.4 140.6 151.5 1.129 1.278 124.5 118.6 841.1 328.1 1.657 1.525 507.5 215.2
Mississippi 68.8% 68.7% 877.8 455.9 2.627 2.168 334.1 210.2 266.6 243.3 2.113 1.729 126.2 140.7 991.9 519.9 2.932 2.254 338.3 230.7
Tennessee 73.2% 74.5% 926.9 428.3 2.803 3.326 330.7 128.8 192.7 194.1 1.891 1.988 101.9 97.6 933.4 425.9 2.773 3.073 336.5 138.6
West South Central 64.8% 64.8% 685.6 242.8 1.928 1.775 355.7 136.8 163.3 178.3 1.405 1.498 116.2 119 671.2 238.8 1.784 1.673 376.3 142.7
Arkansas 82.0% 82.4% 915.3 437.5 2.123 2.16 431.2 202.5 230.7 279.6 1.578 1.803 146.2 155.1 879 427.2 1.909 1.886 460.4 226.5
Louisiana 72.3% 74.1% 663.2 323.8 1.881 1.992 352.5 162.6 199.3 252.2 1.501 1.859 132.8 135.7 633.7 306.6 1.759 1.855 360.3 165.3
Oklahoma 45.9% 45.1% 1339.4 165.6 2.079 1.452 644.3 114 123.8 122.4 1.134 1.264 109.2 96.9 1012.7 141.7 1.713 1.169 591.2 121.2
Texas 64.3% 64.1% 583.1 204.6 1.889 1.704 308.7 120.1 150.3 153.7 1.39 1.399 108.1 109.8 604.3 202.6 1.777 1.656 340 122.3
Mountain 90.2% 90.4% 117.9 153.2 0.966 1.044 122 146.7 90.4 95.4 0.848 0.905 106.5 105.5 101.2 123.5 0.884 0.963 114.5 128.3
Arizona 95.8% 95.9% 103.8 136.9 0.951 1.024 109.2 133.7 66.9 69.1 0.788 0.871 84.9 79.4 88.7 103.7 0.916 0.979 96.8 106
Colorado 88.8% 89.4% 100.2 143.7 0.925 1.041 108.4 138.1 89.2 96.9 0.873 0.923 102.2 105 96.2 138.2 0.85 0.97 113.1 142.4
Idaho 93.1% 92.2% 134.4 167.4 1.071 1.168 125.5 143.4 121.8 144.5 0.985 1.091 123.6 132.5 95.9 112.7 0.757 0.815 126.7 138.3
Montana 68.4% 67.9% 113.9 224.7 1.052 1.398 108.3 160.7 113.9 139.6 1.052 1.214 108.3 115 93.9 187.7 0.852 1.059 110.2 177.2
Nevada 102.7% 102.6% 138.7 195.1 0.942 0.984 147.2 198.2 81.2 77 0.745 0.722 108.9 106.7 96.9 424.3 1.131 1.953 85.7 217.2
New Mexico 85.1% 85.6% 156 175.2 1.102 1.089 141.6 160.9 123.7 125.4 0.908 0.963 136.3 130.3 139 134.6 0.966 1 143.9 134.5
Utah 85.5% 86.7% 127.7 108.7 0.912 0.858 140 126.6 108.5 96.6 0.866 0.82 125.3 117.8 119.9 103.4 0.919 0.857 130.4 120.6
Wyoming 65.9% 62.9% 121.4 159 0.935 1.286 129.8 123.6 102.6 116.1 0.825 1.146 124.3 101.3 106.4 157.3 0.915 1.244 116.3 126.5
Pacific Contiguous 92.8% 92.4% 299.1 246.2 1.295 1.306 230.9 188.5 147.8 152.8 1.035 1.091 142.8 140.1 287.3 232.3 1.215 1.224 236.5 189.9
California 94.6% 94.3% 352.5 202.4 1.409 1.259 250.2 160.7 157.1 156.5 1.097 1.146 143.2 136.5 351.5 195.3 1.393 1.221 252.4 160
Oregon 87.5% 86.2% 122.9 325.2 0.808 1.311 152.1 248.1 103.5 121 0.738 0.804 140.4 150.5 115.9 304 0.753 1.215 153.9 250.3
Washington 88.0% 87.8% 153.8 403.6 1.05 1.52 146.5 265.4 129.8 153.5 0.915 0.99 141.9 155 113.4 345.6 0.725 1.24 156.4 278.8
Pacific Noncontiguous 23.7% 19.5% 456.2 891.3 3.374 4.959 135.2 179.7 325.7 334.9 2.366 3.406 137.6 98.3 472.5 820.6 2.503 3.431 188.8 239.2
Alaska 47.7% 47.6% 499.4 891.3 3.26 4.959 153.2 179.7 325.7 334.9 2.366 3.406 137.6 98.3 472.5 820.6 2.503 3.431 188.8 239.2
Hawaii 6.9%   248.8   3.922   63.4                          
U.S. Total 78.4% 78.1% 366.6 333 1.348 1.426 271.8 233.5 123.9 131.1 1.022 1.09 121.3 120.2 357.7 324.7 1.242 1.315 288 246.9

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.
IEEE refers to the IEEE 1366-2003 or the IEEE 1366-2012 standard.
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.
Loss of Supply Removed excludes outages due to loss of supply from the high-voltage/bulk power system.
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.