Table 11.2 Reliability Metrics Using IEEE of U.S. Distribution System by State, 2022 and 2021

  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 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021 Year 2022 Year 2021
New England 85.5% 85.8% 309.3 382.1 1.341 1.354 230.7 282.2 98.2 104.1 0.972 1.013 101 102.8 349.9 357.7 1.333 1.277 262.4 280.1
Connecticut 78.5% 78.3% 187.4 170.9 0.905 0.989 207 172.8 73.7 76.7 0.673 0.69 109.4 111.1 187.1 169.7 0.897 0.976 208.5 173.8
Maine 102.7% 103.0% 963.6 325.2 3.001 2.492 321.1 130.5 216.7 223.5 1.956 2.072 110.8 107.8 930.7 312.1 2.786 2.223 334.1 140.4
Massachusetts 90.9% 91.4% 165.8 527.8 1.093 1.231 151.7 428.8 84.4 88.1 0.897 0.889 94 99.1 186.4 600.8 0.997 1.108 186.9 542
New Hampshire 88.2% 88.3% 495.5 176.5 1.417 1.095 349.6 161.2 78.2 98.3 0.7 0.858 111.8 114.5 487.4 165 1.383 0.954 352.5 173.1
Rhode Island 98.2% 98.4% 81.9 448.6 0.959 1.429 85.4 313.9 63.2 68.8 0.808 0.948 78.2 72.6 81.1 436 0.932 1.394 87 312.7
Vermont 10.5% 10.5% 914.6 215.3 2.44 1.91 374.8 112.7 178.5 215.3 1.95 1.91 91.5 112.7 877.6 210.1 2.26 1.75 388.3 120.1
Middle Atlantic 58.7% 58.9% 184.7 190.8 1.102 1.156 167.7 165.1 111.7 110.9 0.952 0.959 117.3 115.7 176.3 180.4 1.017 1.05 173.3 171.9
New Jersey 99.2% 99.1% 89.6 139.2 0.876 1.002 102.3 139 78.7 84.3 0.838 0.886 94 95.2 81.4 127.1 0.776 0.868 104.9 146.4
New York 20.1% 20.3% 347.7 218.8 1.466 1.311 237.2 166.8 150 131.5 1.162 1.109 129.1 118.5 354 221 1.489 1.31 237.7 168.7
Pennsylvania 84.1% 84.2% 207.5 222.6 1.163 1.227 178.3 181.4 125.4 125.2 0.975 0.967 128.6 129.5 195.1 209.6 1.059 1.11 184.2 188.8
East North Central 90.8% 90.6% 319.7 377 1.212 1.264 263.8 298.3 121.4 120.8 0.931 0.931 130.4 129.7 288.6 355.2 1.09 1.156 264.8 307.2
Illinois 95.8% 95.8% 90.8 127.3 0.756 0.901 120.2 141.2 59.1 63.6 0.643 0.704 91.9 90.4 89.2 125.6 0.745 0.876 119.8 143.3
Indiana 83.3% 83.7% 276.5 302.7 1.427 1.39 193.7 217.8 139.9 137.4 1.136 1.077 123.2 127.5 217.6 225.2 1.229 1.141 177 197.5
Michigan 94.1% 93.2% 520.7 890.9 1.34 1.647 388.7 540.8 166.8 178.6 1.016 1.017 164.2 175.6 519.9 882.1 1.326 1.615 391.9 546.2
Ohio 96.2% 96.1% 413.6 244.9 1.518 1.33 272.4 184.1 144.1 136 1.122 1.12 128.5 121.4 318.9 191.7 1.204 1.099 264.8 174.5
Wisconsin 74.3% 74.0% 307.9 361.2 1.101 1.079 279.6 334.6 104.7 88 0.763 0.695 137.3 126.6 305.2 360.7 1.053 1.059 289.8 340.7
West North Central 75.9% 75.0% 202.8 236.4 1.107 1.176 183.2 201 90.1 88.9 0.868 0.843 103.9 105.5 191.7 229.3 0.98 1.043 195.7 219.9
Iowa 52.8% 52.0% 95 137.8 0.978 0.959 97.2 143.6 78.2 80.7 0.837 0.812 93.5 99.4 80.1 115.7 0.76 0.78 105.4 148.3
Kansas 79.7% 76.4% 178.3 346 1.321 1.537 134.9 225.1 108.1 113.9 1.087 1.064 99.5 107.1 157.9 327.9 1.143 1.346 138.2 243.6
Minnesota 86.6% 86.4% 275.2 121 1.207 1.039 228 116.5 81 81.7 0.846 0.867 95.8 94.2 270.3 115.7 1.101 0.94 245.5 123.1
Missouri 83.1% 82.9% 149.5 267.9 1.057 1.265 141.5 211.8 97 97.8 0.879 0.834 110.3 117.2 144.2 265.6 0.985 1.147 146.3 231.6
Nebraska 66.1% 65.9% 73 556.9 0.59 1.165 123.8 477.9 56.2 59.9 0.534 0.516 105.2 116.1 71.1 555.3 0.573 1.144 124 485.6
North Dakota 63.2% 58.7% 677.6 101.6 1.425 1.003 475.5 101.3 102.8 88.4 1.065 0.956 96.6 92.5 789.8 77 1.126 0.643 701.2 119.8
South Dakota 67.8% 66.7% 338.3 101.3 1.204 0.979 281.1 103.4 126.3 61.9 0.793 0.679 159.4 91.2 244.7 78.2 0.89 0.69 274.9 113.5
South Atlantic 80.2% 80.0% 615.8 191.2 1.662 1.153 370.5 165.8 127.9 113 1.097 1.017 116.6 111 635 184.8 1.526 1.052 416.1 175.8
Delaware 87.1% 87.2% 79.8 64.3 0.853 0.963 93.5 66.8 66.4 64.3 0.767 0.963 86.5 66.8 80.8 64.8 0.864 0.953 93.4 68
District of Columbia 98.2% 98.6% 33.7 52 0.302 0.45 111.5 115.6 26.3 42 0.277 0.41 95.1 102.4 33.7 52 0.302 0.45 111.5 115.6
Florida 83.7% 84.0% 1011.3 82.9 1.463 0.901 691.2 92 69.8 65.3 0.833 0.796 83.8 82 1012.6 77.2 1.408 0.859 719.3 89.9
Georgia 86.1% 86.0% 212.4 140.5 1.668 1.291 127.3 108.9 129.3 123.8 1.291 1.241 100.2 99.8 185.2 122.9 1.544 1.149 119.9 106.9
Maryland 98.1% 98.2% 260 127.6 1.16 0.965 224.2 132.1 84.2 80.2 0.84 0.79 100.2 101.5 224.6 125.1 1.055 0.945 213 132.3
North Carolina 86.5% 86.0% 486 215.2 1.97 1.249 246.7 172.3 150.7 125.9 1.238 1.065 121.6 118.2 423.1 207.3 1.788 1.152 236.6 179.9
South Carolina 92.0% 90.6% 302.4 122.9 1.87 1.158 161.7 106.2 114.8 101.3 1.154 1.027 99.4 98.6 274.4 106.2 1.571 0.951 174.7 111.7
Virginia 26.5% 26.5% 1108.2 798.2 2.541 1.981 436.1 402.9 342.3 262.7 1.838 1.565 186.2 167.9 1103.6 793.3 2.444 1.883 451.6 421.3
West Virginia 98.1% 97.9% 1003.2 1117.2 2.737 2.383 366.5 468.8 543.6 451.6 2.225 2.096 244.3 215.5 850.9 1002 2.251 2.106 378 475.7
East South Central 62.0% 66.8% 392.5 573.8 2.505 1.825 156.7 314.4 187.8 152.6 1.691 1.417 111 107.6 393 582 2.332 1.698 168.6 342.8
Alabama 14.4% 21.8% 231.3 175.7 2.28 1.378 101.4 127.5 198.4 110.9 1.973 1.161 100.6 95.5 230.1 215.8 2.151 1.58 106.9 136.5
Kentucky 93.0% 94.9% 345.5 698.8 1.707 1.527 202.4 457.7 151.5 130.3 1.278 1.132 118.6 115 328.1 630.1 1.525 1.322 215.2 476.7
Mississippi 68.7% 70.4% 455.9 1189.8 2.168 2.29 210.2 519.6 243.3 224.5 1.729 1.494 140.7 150.3 519.9 1419.2 2.254 2.468 230.7 575.1
Tennessee 74.5% 80.8% 428.3 316.8 3.326 2.007 128.8 157.9 194.1 151.7 1.988 1.69 97.6 89.8 425.9 299.5 3.073 1.824 138.6 164.2
West South Central 64.8% 63.5% 242.8 1893.7 1.775 2.988 136.8 633.9 178.3 186.6 1.498 1.434 119 130.1 238.8 1400.7 1.673 3.019 142.7 464
Arkansas 82.4% 82.2% 437.5 308.4 2.16 1.674 202.5 184.2 279.6 199.4 1.803 1.401 155.1 142.3 427.2 286.2 1.886 1.434 226.5 199.6
Louisiana 74.1% 74.3% 323.8 5868.8 1.992 3.355 162.6 1749.4 252.2 265 1.859 1.781 135.7 148.8 306.6 5836.4 1.855 3.093 165.3 1886.8
Oklahoma 45.1% 45.0% 165.6 165.9 1.452 1.519 114 109.2 122.4 126.2 1.264 1.272 96.9 99.2 141.7 132.9 1.169 1.163 121.2 114.3
Texas 64.1% 62.1% 204.6 1496.4 1.704 3.33 120.1 449.4 153.7 174.7 1.399 1.382 109.8 126.5 202.6 683.7 1.656 3.525 122.3 194
Mountain 90.4% 89.8% 153.2 166.3 1.044 1.131 146.7 147.1 95.4 95.5 0.905 0.905 105.5 105.6 123.5 138.1 0.963 0.981 128.3 140.8
Arizona 95.9% 95.7% 136.9 101.9 1.024 1.055 133.7 96.6 69.1 69.3 0.871 0.813 79.4 85.2 103.7 91 0.979 0.988 106 92.1
Colorado 89.4% 86.7% 143.7 185.4 1.041 1.139 138.1 162.8 96.9 104.8 0.923 0.915 105 114.5 138.2 168.4 0.97 1.005 142.4 167.6
Idaho 92.2% 92.0% 167.4 438 1.168 1.779 143.4 246.2 144.5 137.5 1.091 1.235 132.5 111.4 112.7 223.8 0.815 1.222 138.3 183.1
Montana 67.9% 69.4% 224.7 251.7 1.398 1.621 160.7 155.3 139.6 142.6 1.214 1.348 115 105.8 187.7 211.2 1.059 1.133 177.2 186.4
Nevada 102.6% 102.7% 195.1 102.4 0.984 0.837 198.2 122.3 77 69.6 0.722 0.669 106.7 104.1 424.3 6.8 1.953 0.061 217.2 111
New Mexico 85.6% 83.1% 175.2 204.3 1.089 1.239 160.9 164.9 125.4 120 0.963 1.04 130.3 115.4 134.6 190.9 1 1.074 134.5 177.8
Utah 86.7% 88.6% 108.7 113.4 0.858 0.912 126.6 124.4 96.6 98 0.82 0.857 117.8 114.4 103.4 114.9 0.857 0.922 120.6 124.6
Wyoming 62.9% 63.2% 159 167.9 1.286 1.131 123.6 148.4 116.1 115.6 1.146 0.959 101.3 120.5 157.3 165.1 1.244 1.102 126.5 149.8
Pacific Contiguous 92.4% 92.3% 246.2 483.8 1.306 1.412 188.5 342.6 152.8 145.5 1.091 1.016 140.1 143.2 232.3 421.8 1.224 0.979 189.9 430.6
California 94.3% 94.1% 202.4 335.2 1.259 1.315 160.7 254.9 156.5 148 1.146 1.042 136.5 142 195.3 266 1.221 0.8 160 332.4
Oregon 86.2% 86.4% 325.2 1588.3 1.311 1.604 248.1 990.2 121 113.9 0.804 0.758 150.5 150.2 304 1500.8 1.215 1.473 250.3 1019
Washington 87.8% 87.9% 403.6 554.5 1.52 1.756 265.4 315.8 153.5 151.1 0.99 1.035 155 145.9 345.6 468.6 1.24 1.45 278.8 323.1
Pacific Noncontiguous 19.5% 19.2% 891.3 537.3 4.959 2.372 179.7 226.6 334.9 230.6 3.406 1.723 98.3 133.8 820.6 501.7 3.431 1.778 239.2 282.1
Alaska 47.6% 47.0% 891.3 537.3 4.959 2.372 179.7 226.6 334.9 230.6 3.406 1.723 98.3 133.8 820.6 501.7 3.431 1.778 239.2 282.1
Hawaii                                        
U.S. Total 78.1% 78.1% 333 475.8 1.426 1.436 233.5 331.2 131.1 125.7 1.09 1.039 120.2 120.9 324.7 404.5 1.315 1.294 246.9 312.6

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.