Table 11.3 Reliability Metrics Using Any Method of U.S. Distribution System by State, 2022 and 2021

  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 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 96.4% 96.5% 333 364 1.382 1.362 240.9 267.3 104.2 109.5 0.997 1.042 104.5 105.1
Connecticut 100.2% 100.0% 157.4 145.2 0.821 0.895 191.8 162.2 66.1 68.6 0.621 0.639 106.4 107.3
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
Massachusetts 93.1% 93.2% 163.2 518.7 1.08 1.217 151 426.3 83 87.2 0.885 0.88 93.8 99
New Hampshire 99.3% 99.4% 616.7 234.4 1.783 1.368 345.9 171.3 107.5 127.1 0.931 1.078 115.6 117.9
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
Vermont 87.2% 87.4% 963.5 313.2 2.62 2.074 367.8 151 267.6 262.4 1.967 2.058 136 127.5
Middle Atlantic 97.0% 97.1% 175.9 165.6 0.958 0.999 183.6 165.8 93.4 97.3 0.802 0.821 116.5 118.5
New Jersey 100.9% 100.8% 89.7 138.8 0.875 1 102.4 138.8 79 84.7 0.838 0.885 94.3 95.7
New York 97.1% 97.3% 203 142 0.872 0.854 232.7 166.3 77.6 80.3 0.666 0.686 116.5 117.1
Pennsylvania 94.1% 94.3% 200.4 217.8 1.139 1.2 175.9 181.5 126.1 130.2 0.968 0.963 130.4 135.2
East North Central 95.5% 95.5% 313.6 366.2 1.204 1.251 260.3 292.7 120.2 119.7 0.926 0.928 129.8 129
Illinois 97.4% 97.4% 90.4 127 0.761 0.907 118.9 140.1 59 63.5 0.645 0.702 91.4 90.4
Indiana 91.0% 91.5% 279.3 285.8 1.431 1.358 195.3 210.5 137.4 133.1 1.123 1.06 122.4 125.5
Michigan 97.5% 97.2% 513.1 873.3 1.339 1.656 383.2 527.5 166 178.4 1.015 1.033 163.6 172.6
Ohio 96.3% 96.4% 413.2 244.2 1.517 1.326 272.4 184.1 144 135.9 1.121 1.121 128.4 121.2
Wisconsin 92.1% 91.8% 273.5 311.6 1.043 1.011 262.2 308 99.6 86.4 0.751 0.692 132.7 124.8
West North Central 84.7% 83.8% 194.8 223.6 1.083 1.145 179.8 195.3 89.6 88.1 0.862 0.839 104 105
Iowa 84.9% 84.5% 85.8 133.1 0.888 0.923 96.6 144.1 75.5 79.5 0.809 0.805 93.3 98.8
Kansas 81.3% 78.4% 178.8 341.5 1.321 1.534 135.4 222.7 108.1 113 1.086 1.059 99.5 106.8
Minnesota 88.6% 88.1% 273.7 120.9 1.21 1.041 226.3 116.2 82.2 82.5 0.856 0.876 96 94.2
Missouri 87.8% 87.6% 148 259.7 1.05 1.244 141 208.8 97 97.3 0.876 0.828 110.7 117.5
Nebraska 72.7% 72.6% 82.1 516 0.608 1.154 134.9 447 62.3 60.8 0.541 0.511 115.1 119
North Dakota 89.1% 84.5% 559.6 85.4 1.297 0.879 431.4 97.2 99.6 85.9 1.036 0.968 96.1 88.7
South Dakota 74.1% 72.8% 327.1 105.6 1.235 1.009 264.9 104.6 123.5 62.7 0.793 0.679 155.8 92.3
South Atlantic 95.9% 95.8% 663.7 192.8 1.655 1.182 401 163.2 125.6 112.1 1.105 1.035 113.6 108.3
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
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
Florida 99.6% 99.8% 1146.3 80.8 1.48 0.929 774.5 87 69.7 64.8 0.866 0.834 80.4 77.7
Georgia 87.8% 87.7% 264.3 145.8 1.695 1.317 155.9 110.7 134.6 129.4 1.316 1.268 102.3 102
Maryland 98.5% 98.6% 259.1 127.1 1.156 0.962 224.1 132.1 84.2 80.2 0.84 0.79 100.2 101.5
North Carolina 94.7% 94.2% 456.3 205.5 1.927 1.242 236.8 165.4 148.6 123.6 1.236 1.066 120.2 116
South Carolina 95.7% 95.1% 301.1 120.9 1.87 1.161 161 104.1 114.8 100.7 1.156 1.031 99.3 97.7
Virginia 96.8% 96.7% 593.9 434.4 1.853 1.576 320.4 275.6 187.5 164.9 1.343 1.254 139.6 131.5
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
East South Central 87.0% 88.0% 349.2 513.1 2.291 1.785 152.4 287.5 175.5 147.5 1.588 1.374 110.5 107.3
Alabama 79.3% 79.5% 210.1 234.9 1.448 1.43 145.1 164.3 138.8 119.1 1.159 1.08 119.8 110.3
Kentucky 96.6% 96.4% 345.8 707.8 1.781 1.529 194.1 462.8 151.7 129.8 1.3 1.131 116.7 114.8
Mississippi 83.5% 84.2% 448.5 1134.4 2.429 2.367 184.6 479.3 246.7 220.6 1.967 1.556 125.4 141.8
Tennessee 88.0% 90.6% 404.5 302.7 3.196 2.019 126.6 149.9 188.3 149.4 1.949 1.706 96.6 87.6
West South Central 95.1% 93.9% 237.4 1456.9 1.721 2.684 138 542.9 154.9 161.2 1.345 1.303 115.2 123.7
Arkansas 89.6% 89.4% 415.5 315.9 2.11 1.658 196.9 190.5 274.7 195.9 1.77 1.383 155.2 141.7
Louisiana 95.4% 95.3% 304 4811.1 2.077 3.295 146.4 1459.9 246.1 228.2 1.931 1.848 127.5 123.5
Oklahoma 90.3% 90.3% 195.6 179.4 1.442 1.4 135.6 128.1 144.2 146.5 1.266 1.244 113.9 117.8
Texas 96.5% 94.7% 212 1175.3 1.654 2.9 128.1 405.2 127.5 147.4 1.203 1.201 105.9 122.7
Mountain 93.1% 93.3% 155.9 174.8 1.061 1.195 147 146.2 98.5 99.7 0.916 0.958 107.5 104.1
Arizona 96.8% 96.7% 139.7 106.2 1.053 1.22 132.7 87 72.3 71.7 0.897 0.973 80.6 73.7
Colorado 92.4% 92.5% 141.5 180.9 1.031 1.103 137.2 164 96.2 102.6 0.917 0.892 105 115
Idaho 94.1% 93.9% 180.7 475.2 1.168 1.779 154.8 267.1 158.3 162.1 1.091 1.235 145.1 131.3
Montana 74.6% 76.2% 225.6 309.9 1.376 1.706 163.9 181.7 146.1 146 1.203 1.341 121.5 108.9
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
New Mexico 90.6% 90.4% 182.6 221.2 1.166 1.446 156.5 152.9 129.1 131.7 1.005 1.218 128.4 108.1
Utah 89.7% 91.7% 111.3 116 0.887 0.934 125.5 124.1 100.4 100.9 0.854 0.873 117.5 115.6
Wyoming 76.7% 76.8% 170.1 170.5 1.332 1.163 127.7 146.6 113 116.3 1.074 0.897 105.3 129.6
Pacific Contiguous 98.6% 98.6% 242.3 464.7 1.29 1.396 187.9 332.9 148.8 141.6 1.078 1.008 138.1 140.5
California 100.2% 100.1% 198.5 325.2 1.248 1.309 159.1 248.4 150.5 142.7 1.127 1.033 133.5 138.1
Oregon 93.2% 93.4% 322.9 1489.2 1.288 1.571 250.8 947.7 123.4 116.5 0.813 0.764 151.9 152.5
Washington 95.0% 95.3% 395.3 527.3 1.481 1.692 267 311.5 154.9 150.4 0.991 1.024 156.4 146.9
Pacific Noncontiguous 93.5% 94.2% 330.8 285.5 2.341 1.799 141.3 158.7 162.9 145.5 1.745 1.335 93.3 109
Alaska 84.4% 85.9% 575.2 379.1 3.523 2.132 163.3 177.8 334.9 230.6 3.406 1.723 98.3 133.8
Hawaii 99.9% 100.0% 187.2 229.7 1.647 1.6 113.7 143.5 105.9 115.7 1.195 1.199 88.6 96.5
U.S. Total 94.7% 94.5% 335.5 440 1.405 1.425 238.8 308.8 125.7 121.5 1.064 1.025 118.1 118.5

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.