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With Data for 2025 Release Date: October 21, 2026 Next Release: October 2027
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SAS Output
Table 11.2 Reliability Metrics Using IEEE of U.S. Distribution System by State, 2025 and 2024

  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 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024 Year 2025 Year 2024
New England 90.4% 89.7% 176.4 389.8 1.114 1.301 158.4 299.6 90.8 101.4 0.866 0.906 104.8 111.9 173.7 387.1 1.075 1.242 161.6 311.8
Connecticut 99.5% 99.8% 185.8 152.8 0.935 0.877 198.7 174.3 77 73.6 0.656 0.649 117.4 113.3 185.6 152.3 0.934 0.858 198.7 177.4
Maine 100.2% 100.3% 363.4 1748.6 2.24 3.636 162.2 480.9 191.7 274 1.834 2.139 104.5 128.1 351.2 1701 2.091 3.326 167.9 511.5
Massachusetts 91.7% 90.2% 122.2 103.7 0.909 0.852 134.4 121.8 75.5 77 0.744 0.748 101.4 102.9 118.1 103.9 0.87 0.829 135.8 125.3
New Hampshire 88.3% 88.1% 150.7 735.5 1.12 1.616 134.5 455.2 86.1 84.2 0.788 0.775 109.2 108.5 150.2 733 1.113 1.597 135 459
Rhode Island 96.9% 97.6% 183 104.3 0.96 0.896 190.6 116.4 60.1 60.8 0.73 0.761 82.3 79.9 182.4 99 0.949 0.862 192.2 114.9
Vermont 10.8% 10.5% 251.3 895.8 2.06 3.34 122 268.2 150.6 231.8 1.45 1.4 103.9 165.6 242.9 884.6 1.42 2.06 171.1 429.4
Middle Atlantic 60.5% 60.5% 289 309.1 1.309 1.34 220.8 230.7 122.8 121.5 1.029 0.986 119.4 123.3 269.7 299.7 1.193 1.232 226 243.2
New Jersey 99.2% 99.2% 155.1 173.3 1.12 1.116 138.5 155.3 95.6 98.8 0.969 0.944 98.7 104.7 138.8 161.2 0.999 0.971 138.9 166
New York 23.6% 23.8% 246.8 477.3 1.405 1.668 175.6 286.1 144.8 142.8 1.125 1.063 128.7 134.4 245.4 483.6 1.37 1.661 179.1 291.1
Pennsylvania 84.4% 84.4% 413 353.1 1.424 1.393 290 253.5 136.3 131.5 1.04 0.989 131.1 133 384.6 340.9 1.282 1.278 300 266.7
East North Central 91.8% 91.2% 310.3 357.8 1.184 1.159 262.2 308.6 112.9 114.3 0.911 0.869 123.9 131.5 264.4 342.5 1.067 1.058 247.8 323.7
Illinois 95.5% 96.6% 145.8 158 0.872 0.848 167.1 186.3 62.1 59.1 0.703 0.637 88.4 92.7 135.2 154.7 0.839 0.815 161.2 189.9
Indiana 89.6% 84.3% 379 310 1.391 1.276 272.5 242.9 120.8 123.3 0.977 1.008 123.6 122.4 319 252.3 1.287 1.14 247.9 221.4
Michigan 94.4% 94.3% 608.6 481.7 1.418 1.365 429.1 353 161 161.3 1.038 0.983 155.1 164 476 456.2 1.223 1.252 389.3 364.5
Ohio 96.7% 96.5% 205.5 511 1.275 1.298 161.2 393.7 130.1 133.3 1.082 0.999 120.3 133.4 187.5 500.3 1.117 1.124 167.9 445.1
Wisconsin 74.4% 74.2% 264.1 296.8 0.987 1.041 267.5 285.2 87.4 97.5 0.673 0.726 129.8 134.3 261.3 294.8 0.943 1.021 276.9 288.8
West North Central 77.0% 76.9% 306.8 255.3 1.27 1.229 241.5 207.8 96.6 93.9 0.891 0.879 108.4 106.8 281.8 254.7 1.142 1.113 246.7 228.9
Iowa 53.1% 52.9% 183.2 200.3 1.141 1.213 160.6 165.1 79.9 84.1 0.767 0.811 104.2 103.6 156.7 187 0.949 1.043 165.2 179.3
Kansas 80.0% 80.0% 192.8 289.8 1.309 1.503 147.2 192.8 96.3 104 0.964 1.005 99.9 103.5 177.5 277.9 1.174 1.35 151.2 205.9
Minnesota 87.0% 86.9% 182 222.4 1.176 1.262 154.8 176.3 93.2 91.5 0.939 0.902 99.3 101.5 168.6 222.3 1.072 1.144 157.3 194.3
Missouri 82.5% 82.7% 466 212.6 1.372 1.176 339.6 180.8 115.9 106.6 0.958 0.924 121 115.4 435.3 206 1.272 1.07 342.3 192.5
Nebraska 66.3% 66.2% 542.8 697.8 1.322 1.244 410.6 560.8 86.1 69.8 0.614 0.6 140.3 116.3 530.7 696.7 1.306 1.235 406.3 564
North Dakota 84.2% 83.6% 212.1 102.7 1.186 0.942 178.9 109 75.2 87 0.845 0.881 88.9 98.7 161.2 82.2 1.026 0.681 157.1 120.7
South Dakota 71.9% 70.8% 284.2 85.6 1.335 0.815 212.9 105 63.8 61.5 0.757 0.72 84.3 85.4 249.2 67.5 0.863 0.582 288.7 116
South Atlantic 82.1% 81.8% 208 1405.8 1.293 1.83 160.9 768.3 121 133.1 1.075 1.032 112.5 129 186.7 1352.3 1.126 1.671 165.8 809.3
Delaware 87.3% 87.5% 103.9 117.9 0.942 0.855 110.3 138 74.6 66.8 0.789 0.727 94.6 91.9 106 118.9 0.962 0.857 110.1 138.7
District of Columbia 98.7% 98.9% 50.3 32.6 0.324 0.271 155.2 120.2 33.9 26.4 0.309 0.246 109.9 107.2 50.3 32.6 0.324 0.271 155.2 120.2
Florida 83.7% 84.1% 72.7 1487.6 0.836 1.784 86.9 833.9 65.4 66.7 0.758 0.741 86.2 90 69.5 1485.6 0.789 1.716 88 865.9
Georgia 88.2% 87.0% 268.9 1208.1 1.843 2.104 145.9 574.3 145.5 211.4 1.438 1.244 101.2 170 236.4 768 1.677 1.905 141 403.2
Maryland 98.5% 98.6% 178.3 118.1 0.956 0.817 186.6 144.5 78.9 75.1 0.733 0.686 107.7 109.6 175.5 116.7 0.933 0.802 188 145.6
North Carolina 90.3% 90.6% 191.5 1518.1 1.362 1.826 140.5 831.3 142.1 143.9 1.192 1.176 119.2 122.4 177.5 1475 1.247 1.678 142.4 879.2
South Carolina 95.5% 92.6% 153 3155 1.256 2.368 121.8 1332.3 103.4 115.9 1.06 1.198 97.5 96.7 137.3 2972.9 1.073 2.054 127.9 1447.2
Virginia 30.6% 30.6% 763.1 962.1 2.351 2.238 324.6 429.9 249.6 245.1 1.692 1.641 147.5 149.4 735.7 911.2 2.057 2.038 357.6 447
West Virginia 97.6% 97.3% 1013.2 1165.5 3.082 2.832 328.8 411.5 498.1 486.1 2.463 2.287 202.2 212.6 876.2 1067.4 2.604 2.5 336.5 427
East South Central 60.6% 62.1% 341.8 423.7 1.836 1.955 186.1 216.7 183.1 176.3 1.528 1.553 119.9 113.6 320 423 1.711 1.872 187.1 226
Alabama 15.7% 15.5% 270.2 197.7 1.918 1.749 140.9 113 127.3 120.8 1.431 1.29 88.9 93.6 260.1 189.6 1.736 1.654 149.9 114.6
Kentucky 93.9% 93.8% 396.3 537.7 1.862 1.783 212.9 301.6 171.1 145.7 1.415 1.216 120.9 119.8 380.2 520.1 1.674 1.58 227.1 329.2
Mississippi 69.2% 69.3% 524.4 607.3 2.502 2.482 209.6 244.7 318.6 279 1.997 1.882 159.5 148.3 601.8 693.8 2.701 2.714 222.9 255.7
Tennessee 69.3% 73.5% 227.7 289.3 1.553 1.939 146.7 149.2 146.9 169.9 1.464 1.752 100.3 97 178.3 283.3 1.44 1.896 123.8 149.4
West South Central 65.9% 65.2% 252.2 1268.9 1.857 2.23 135.8 568.9 164.9 164.2 1.574 1.446 104.8 113.5 242.1 1295.8 1.725 2.129 140.3 608.6
Arkansas 82.3% 82.0% 474.5 527.8 2.174 2.137 218.2 247 211.7 201.9 1.61 1.617 131.5 124.8 459.8 377.8 2.045 1.807 224.8 209.2
Louisiana 73.0% 72.3% 271.6 630.6 2.205 2.356 123.2 267.7 229.7 215.9 1.987 1.661 115.6 130 246.5 603 1.955 2.21 126.1 272.8
Oklahoma 45.9% 46.2% 297 220.7 1.724 1.584 172.3 139.3 127.2 121.3 1.295 1.265 98.2 95.9 262.9 188.1 1.435 1.251 183.2 150.4
Texas 65.9% 64.9% 211.1 1614.3 1.756 2.293 120.2 704.2 150 153.4 1.519 1.398 98.7 109.7 203.7 1724.6 1.657 2.27 122.9 759.9
Mountain 91.5% 91.5% 169.6 176.3 1.093 1.185 155.2 148.8 101.6 102.4 0.964 0.973 105.3 105.2 162 169.5 1 1.109 161.9 152.9
Arizona 95.0% 95.7% 68.7 83.6 0.881 0.963 77.9 86.8 61.3 69.8 0.825 0.88 74.3 79.4 69.2 75.8 0.889 0.935 77.8 81.1
Colorado 92.6% 92.3% 272.5 257 1.286 1.415 211.9 181.6 117.1 118.9 1.085 1.145 107.9 103.9 262.4 251.2 1.178 1.335 222.9 188.1
Idaho 93.4% 93.2% 291.4 204.4 1.158 1.314 251.5 155.5 143.6 152.5 0.974 1.136 147.4 134.2 165.7 150.5 0.81 0.959 204.4 157.1
Montana 70.9% 72.3% 286.4 341.7 1.335 1.628 214.5 209.8 135.4 152.3 1.179 1.163 114.8 130.9 265.7 298.1 1.065 1.36 249.6 219.2
Nevada 103.1% 103.1% 127.8 158.9 1.125 1.108 113.6 143.4 100.7 63.8 1.007 0.658 100 97 56.7 116.7 0.528 1.313 107.5 88.9
New Mexico 87.0% 85.2% 161.9 272.6 1.201 1.325 134.8 205.7 143 152 1.108 1.106 129 137.4 149.2 255.4 1.068 1.128 139.6 226.5
Utah 86.2% 85.4% 117 115.4 0.865 1.008 135.1 114.5 97.9 105 0.817 0.956 119.8 109.9 109.2 108.9 0.858 1.002 127.2 108.7
Wyoming 71.8% 71.3% 224.2 137.8 1.514 0.999 148 138 111.3 116 0.925 0.925 120.4 125.4 205.6 128.6 1.433 1.018 143.5 126.4
Pacific Contiguous 92.0% 93.0% 357.1 371.7 1.311 1.42 272.3 261.7 136.7 159.6 1.03 1.133 132.8 140.9 326.3 380 1.271 1.41 256.7 269.6
California 93.1% 94.4% 358.3 285 1.305 1.353 274.6 210.7 139.6 164.4 1.069 1.181 130.6 139.2 331.1 306.3 1.334 1.429 248.1 214.3
Oregon 87.4% 87.5% 302.4 579.3 1.118 1.324 270.6 437.6 100.2 124.1 0.702 0.824 142.7 150.6 287.4 547 1.014 1.197 283.5 457
Washington 89.9% 90.0% 381.6 643.5 1.445 1.774 264.1 362.8 143.8 157.3 1.033 1.085 139.2 144.9 328.3 587.2 1.159 1.445 283.2 406.3
Pacific Noncontiguous 37.1% 36.9% 538.4 329.8 3.071 2.55 175.3 129.3 238.2 195.4 2.221 1.92 107.3 101.7 568.7 307.3 2.293 1.524 248 201.7
Alaska 79.6% 79.5% 563.5 323.2 3.024 2.321 186.3 139.3 242.7 192.4 2.204 1.862 110.1 103.3 685.3 371 2.763 1.84 248 201.7
Hawaii 7.0% 6.9% 335.4 382.6 3.45 4.39 97.2 87.2 202 219.3 2.36 2.39 85.6 91.8 0 0 0 0    
U.S. Total 79.4% 79.3% 269.2 662.6 1.34 1.531 201 432.7 125.3 131.6 1.08 1.065 116 123.6 246.8 646.1 1.226 1.431 201.2 451.6

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.

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