Table 11.5 SAIFI Values (Times Per Year) of U.S. Distribution System by State, 2013 - 2023

  IEEE Any Method
  All Events (With Major Event Days) Without Major Event Days Loss of Supply Removed All Events (With Major Event Days) Without Major Event Days
Census Division
and State
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
New England 1.4 1.567 1.056 1.411 1.488 1.785 1.359 1.98 1.354 1.341 1.368 1.05 1.035 0.989 1.202 0.858 1.075 0.922 1.03 1.013 0.972 0.919 1.304 1.545 1.013 1.291 1.44 1.705 1.299 1.897 1.277 1.333 1.298 1.466 1.568 1.029 1.307 1.45 1.744 1.386 1.856 1.362 1.382 1.398 1.103 1.056 0.972 1.148 0.91 1.085 0.936 1.101 1.042 0.997 0.944
Connecticut 0.931 0.777 0.757 1.16 1.045 1.286 0.998 1.982 0.989 0.905 0.911 0.917 0.777 0.699 0.993 0.759 0.731 0.658 0.691 0.69 0.673 0.681 0.915 0.777 0.748 1.15 1.035 1.256 0.994 1.962 0.976 0.897 0.876 0.931 0.742 0.7 1.063 0.947 1.255 0.971 1.827 0.895 0.821 0.872 0.904 0.742 0.647 0.906 0.682 0.705 0.621 0.659 0.639 0.621 0.655
Maine 2.894 5.123 1.871 2.693 2.814 2.801 2.525 3.863 2.492 3.001 3.314 1.976 2.041 1.818 2.166 1.93 2.038 1.679 2.117 2.072 1.956 1.979 2.611 5.101 1.677 2.369 2.632 2.598 2.292 3.75 2.223 2.786 3.015 2.894 5.123 1.871 2.693 2.814 2.801 2.525 3.863 2.492 3.001 3.314 1.976 2.041 1.818 2.166 1.93 2.038 1.679 2.117 2.072 1.956 1.979
Massachusetts 1.14 0.969 0.781 1.027 1.026 1.661 1.115 1.216 1.231 1.093 1.069 0.911 0.836 0.745 0.91 0.254 0.853 0.77 0.802 0.889 0.897 0.79 1.135 0.954 0.782 0.876 0.988 1.612 1.089 1.159 1.108 0.997 1.025 1.129 0.956 0.787 0.991 1.087 1.552 1.224 1.302 1.217 1.08 1.057 0.906 0.83 0.746 0.923 0.577 0.918 0.842 1.01 0.88 0.885 0.78
New Hampshire 1.98 1.969 1.13 1.534 2.004 1.889 1.168 1.514 1.095 1.417 1.485 1.057 1.363 1.095 1.36 1.146 1.082 0.765 0.913 0.858 0.7 0.766 1.057 1.816 1.054 1.49 1.982 1.871 1.168 1.504 0.954 1.383 1.48 2.173 2.264 1.384 1.537 2.297 2.173 1.429 1.821 1.368 1.783 1.753 1.301 1.582 1.353 1.382 1.295 1.268 0.919 1.085 1.078 0.931 0.989
Rhode Island 1.26 0.762 1.231 1.206 1.185 1.57 1.397 1.966 1.429 0.959 0.782 0.72 0.762 0.937 0.973 0.775 1.001 1.024 0.945 0.948 0.808 0.667 1.17 0.76 1.231 1.046 1.103 1.394 1.247 1.442 1.394 0.932 0.736 1.26 0.762 1.231 1.206 1.185 1.57 1.397 1.966 1.429 0.959 0.782 0.72 0.762 0.937 0.973 0.775 1.001 1.024 0.945 0.948 0.808 0.667
Vermont 2.838 2.521 1.765 1.552 2.609 3.39 1.96 1.63 1.91 2.44 2.25 1.914 1.388 1.765 1.552 1.632 2.34 1.49 1.63 1.91 1.95 1.38 2.838 2.331 1.531 1.372 2.491 2.86 1.9 1.56 1.75 2.26 2.04 2.41 2.195 1.67 1.862 2.413 2.619 1.981 1.898 2.074 2.62 2.352 1.865 1.492 1.748 1.8 1.889 1.908 1.465 1.926 2.058 1.967 1.58
Middle Atlantic 1.135 1.143 1.047 1.162 1.098 1.466 1.293 1.45 1.156 1.102 1.041 0.994 0.922 0.937 1.023 0.927 1.015 0.999 0.96 0.959 0.952 0.89 1.036 1.06 0.973 1.084 1.017 1.354 1.193 1.341 1.05 1.017 0.951 0.885 0.903 0.849 0.959 0.95 1.237 1.087 1.218 0.999 0.958 0.883 0.765 0.747 0.766 0.845 0.781 0.84 0.831 0.82 0.821 0.802 0.736
New Jersey 1.358 0.953 0.994 1.158 0.936 1.415 1.193 1.581 1.002 0.876 0.88 1.228 0.867 0.833 0.981 0.876 0.962 0.942 0.939 0.886 0.838 0.83 1.182 0.914 0.953 1.083 0.881 1.287 1.081 1.438 0.868 0.776 0.783 1.333 0.953 0.991 1.154 0.934 1.421 1.19 1.583 1 0.875 0.881 1.204 0.868 0.833 0.98 0.875 0.964 0.942 0.938 0.885 0.838 0.831
New York 1.308 1.15 1.173 1.313 1.397 1.518 1.475 1.479 1.311 1.466 1.127 0.949 0.96 1.135 1.19 1.02 1.056 1.044 1.077 1.109 1.162 0.963 1.317 1.15 1.137 1.235 1.412 1.532 1.487 1.497 1.31 1.489 1.14 0.723 0.635 0.671 0.783 0.844 1.005 0.876 0.975 0.854 0.872 0.725 0.57 0.552 0.64 0.694 0.62 0.648 0.635 0.683 0.686 0.666 0.586
Pennsylvania 1 1.282 1.02 1.092 1.126 1.489 1.312 1.336 1.227 1.163 1.143 0.936 0.952 0.909 0.973 0.935 1.044 1.029 0.939 0.967 0.975 0.914 0.903 1.143 0.909 1.011 0.998 1.35 1.187 1.215 1.11 1.059 1.025 0.974 1.218 0.994 1.067 1.109 1.431 1.309 1.297 1.2 1.139 1.108 0.902 0.919 0.891 0.96 0.938 1.022 1.025 0.928 0.963 0.968 0.878
East North Central 1.203 1.15 1.201 1.106 1.193 1.199 1.307 1.179 1.264 1.212 1.187 0.89 0.959 1.036 0.939 0.92 0.974 1 0.909 0.931 0.931 0.808 1.134 1.069 1.042 1.019 1.103 1.087 1.182 1.071 1.156 1.09 1.113 1.186 1.146 1.187 1.104 1.183 1.194 1.297 1.167 1.251 1.204 1.177 0.885 0.957 1.028 0.939 0.918 0.975 1 0.907 0.928 0.926 0.804
Illinois 1.093 1.124 1.112 1.016 0.921 0.912 0.923 0.925 0.901 0.756 0.833 0.86 0.95 0.937 0.83 0.749 0.777 0.762 0.653 0.704 0.643 0.604 1.09 1.105 1.072 0.999 0.9 0.887 0.906 0.903 0.876 0.745 0.819 1.1 1.126 1.111 1.023 0.926 0.916 0.926 0.924 0.907 0.761 0.835 0.866 0.954 0.94 0.831 0.754 0.779 0.763 0.654 0.702 0.645 0.605
Indiana 1.206 1.258 1.294 1.347 1.313 1.493 1.524 1.31 1.39 1.427 1.414 0.962 1.047 1.041 1.064 1.045 1.153 1.171 1.005 1.077 1.136 0.944 0.925 1.107 1.142 1.16 1.136 1.232 1.248 1.011 1.141 1.229 1.292 1.18 1.28 1.263 1.336 1.27 1.457 1.503 1.289 1.358 1.431 1.447 0.944 1.049 1.022 1.048 1.01 1.133 1.17 0.996 1.06 1.123 0.946
Michigan 1.531 1.23 1.151 1.13 1.413 1.374 1.542 1.375 1.647 1.34 1.543 0.913 0.898 0.979 1.004 0.984 1.054 1.162 1.069 1.017 1.016 0.931 1.504 1.199 1.119 1.105 1.388 1.346 1.505 1.339 1.615 1.326 1.533 1.523 1.213 1.141 1.146 1.414 1.373 1.535 1.384 1.656 1.339 1.512 0.915 0.893 0.967 1.012 0.989 1.055 1.162 1.082 1.033 1.015 0.921
Ohio 1.168 1.197 1.193 1.181 1.351 1.408 1.475 1.356 1.33 1.518 1.252 0.945 1.107 1.128 1.058 1.134 1.174 1.136 1.073 1.12 1.122 0.918 1.017 1.006 1.021 0.989 1.149 1.16 1.224 1.168 1.099 1.204 1.075 1.176 1.209 1.205 1.184 1.354 1.411 1.474 1.356 1.326 1.517 1.252 0.952 1.113 1.141 1.065 1.137 1.178 1.136 1.073 1.121 1.121 0.918
Wisconsin 0.869 0.835 1.456 0.864 0.928 0.768 1.122 0.833 1.079 1.101 0.913 0.715 0.673 1.174 0.668 0.583 0.649 0.723 0.71 0.695 0.763 0.633 0.837 0.812 0.752 0.826 0.886 0.737 1.051 0.774 1.059 1.053 0.881 0.816 0.838 1.319 0.841 0.909 0.811 1.095 0.802 1.011 1.043 0.877 0.695 0.693 1.099 0.686 0.625 0.702 0.755 0.703 0.692 0.751 0.631
West North Central 1.258 1.129 1.136 1.204 1.114 1.037 1.15 1.045 1.176 1.107 1.093 0.953 1.009 0.998 0.94 0.86 0.878 0.902 0.855 0.843 0.868 0.811 1.15 1.026 1.026 1.053 0.995 0.92 1.063 0.985 1.043 0.98 0.973 1.255 1.105 1.109 1.142 1.101 1.026 1.132 1.061 1.145 1.083 1.079 0.975 0.988 0.964 0.93 0.865 0.882 0.908 0.849 0.839 0.862 0.811
Iowa 1.068 1.224 0.997 1.166 1.073 1.021 1.128 1.489 0.959 0.978 0.859 0.946 0.993 0.963 0.99 0.968 0.933 0.936 0.864 0.812 0.837 0.645 0.918 1.06 0.849 0.897 0.851 0.851 0.961 1.341 0.78 0.76 0.741 0.96 1.201 0.964 1.049 1.002 1.015 1.08 1.487 0.923 0.888 0.907 0.844 0.992 0.924 0.937 0.907 0.938 0.947 0.849 0.805 0.809 0.709
Kansas 1.584 1.354 1.629 1.423 1.488 1.163 1.361 0.945 1.537 1.321 1.327 1.25 1.207 1.306 1.238 1.145 0.986 1.028 0.89 1.064 1.087 1.004 1.314 1.217 1.39 1.281 1.248 1.007 1.342 0.91 1.346 1.143 1.171 1.571 1.348 1.629 1.408 1.481 1.168 1.368 0.945 1.534 1.321 1.318 1.248 1.21 1.312 1.231 1.145 0.988 1.034 0.886 1.059 1.086 0.998
Minnesota 1.247 1.016 0.972 1.217 0.953 1.032 0.987 1.037 1.039 1.207 0.973 0.875 0.924 0.828 0.861 0.77 0.889 0.793 0.895 0.867 0.846 0.778 1.176 0.957 0.903 1.096 0.877 0.907 0.878 0.962 0.94 1.101 0.859 1.215 0.995 0.969 1.193 0.946 1.016 0.994 1.036 1.041 1.21 0.973 0.859 0.901 0.813 0.855 0.775 0.885 0.805 0.901 0.876 0.856 0.785
Missouri 1.086 1.079 1.023 1.042 1.16 0.974 1.301 1.002 1.265 1.057 1.324 0.813 0.968 0.932 0.776 0.782 0.831 1.019 0.862 0.834 0.879 0.878 1.123 1.08 1.276 0.963 1.303 1.108 1.557 0.969 1.147 0.985 1.263 1.134 1.078 1.058 1.05 1.201 0.973 1.297 0.997 1.244 1.05 1.315 0.859 0.975 0.951 0.799 0.823 0.841 1.018 0.851 0.828 0.876 0.876
Nebraska 0.774 0.69 0.662 0.702 0.909 1.099 0.659 0.792 1.165 0.59 0.555 0.661 0.603 0.572 0.578 0.677 0.73 0.549 0.552 0.516 0.534 0.478 0.077 0.569 0.523 0.648 0.672 0.651 0.655 0.917 1.144 0.573 0.545 0.838 0.869 0.732 0.675 0.879 1.085 0.654 0.79 1.154 0.608 0.558 0.577 0.699 0.553 0.556 0.676 0.707 0.547 0.556 0.511 0.541 0.48
North Dakota 1.601 1.797 2.38 2.063 1.039 0.954 1.006 1.151 1.003 1.425 1.151 1.568 1.725 2.319 1.932 0.943 0.874 0.832 1 0.956 1.065 0.942 0.855 0.957 0.713 1.046 0.675 0.693 0.785 0.814 0.643 1.126 0.843 2.757 1.419 2.074 1.614 0.966 0.914 0.87 0.972 0.879 1.297 1.055 3.405 1.725 2.319 1.852 0.897 0.888 0.819 0.953 0.968 1.036 0.907
South Dakota 1.88 1.048 1.121 1.362 1.156 1.108 1.627 1.094 0.979 1.204 1.017 1.037 0.964 0.939 0.998 1.064 0.928 1.101 0.896 0.679 0.793 0.894 1.44 0.698 0.87 0.88 0.9 0.696 1.114 0.745 0.69 0.89 0.691 1.867 1.009 1.133 1.4 1.152 1.084 1.576 1.096 1.009 1.235 1.011 1.054 0.949 0.926 0.99 1.049 0.915 1.094 0.896 0.679 0.793 0.894
South Atlantic 1.249 1.42 1.335 1.6 1.768 1.584 1.296 1.464 1.153 1.662 1.341 1.075 1.15 1.173 1.195 1.112 1.148 1.085 1.105 1.017 1.097 1.071 1.114 1.411 1.18 1.465 1.604 1.469 1.172 1.27 1.052 1.526 1.176 1.293 1.385 1.315 1.562 1.742 1.559 1.322 1.475 1.182 1.655 1.344 1.083 1.152 1.167 1.199 1.115 1.153 1.101 1.131 1.035 1.105 1.082
Delaware 1.464 1.414 1.53 1.343 1.131 1.037 0.981 1.51 0.963 0.853 0.842 1.283 1.176 1.298 1.147 0.994 0.859 0.864 0.951 0.963 0.767 0.701 1.376 1.331 1.369 1.303 1.09 0.98 0.981 1.5 0.953 0.864 0.858 1.46 1.415 1.522 1.35 1.128 1.032 0.976 1.51 0.963 0.853 0.83 1.28 1.179 1.292 1.156 0.992 0.856 0.86 0.951 0.963 0.767 0.692
District of Columbia 0.88 0.69 0.686 0.82 0.553 0.643 0.59 0.4 0.45 0.302 0.37 0.88 0.64 0.686 0.82 0.553 0.538 0.49 0.37 0.41 0.277 0.318 0.76 0.69 0.686 0.82 0.55 0.643 0.59 0.4 0.45 0.302 0.37 0.88 0.69 0.686 0.82 0.553 0.643 0.59 0.4 0.45 0.302 0.37 0.88 0.64 0.686 0.82 0.553 0.538 0.49 0.37 0.41 0.277 0.318
Florida 0.965 1.134 1.096 1.372 2.068 1.112 0.985 1.139 0.901 1.463 0.982 0.933 1.105 1.041 1.051 1 0.953 0.906 0.893 0.796 0.833 0.78 0.936 1.5 1.014 1.278 1.993 1.095 0.919 1.058 0.859 1.408 0.929 1.126 1.148 1.091 1.357 2.017 1.129 1.012 1.171 0.929 1.48 1.015 1.017 1.136 1.06 1.073 1.04 0.972 0.939 0.952 0.834 0.866 0.823
Georgia 1.266 1.53 1.563 1.525 2.214 1.542 1.361 1.952 1.291 1.668 1.858 1.137 1.179 1.279 1.34 1.189 1.248 1.222 1.328 1.241 1.291 1.336 0.774 1.29 1.4 1.241 2.064 1.423 1.235 1.746 1.149 1.544 1.765 1.327 1.508 1.539 1.526 2.449 1.557 1.382 1.964 1.317 1.695 1.885 1.152 1.169 1.265 1.342 1.199 1.257 1.241 1.36 1.268 1.316 1.357
Maryland 1.14 1.284 1.023 1.099 0.898 1.248 1.049 0.919 0.965 1.16 0.92 1.044 1.01 0.972 1.023 0.816 0.939 0.864 0.77 0.79 0.84 0.704 1.002 1.219 0.98 1.055 0.862 1.229 1.018 0.882 0.945 1.055 0.882 1.123 1.265 1.089 1.092 0.97 1.296 1.049 0.956 0.962 1.156 0.92 1.036 1.008 1.044 1.022 0.863 0.965 0.879 0.805 0.79 0.84 0.703
North Carolina 1.351 1.512 1.383 1.856 1.381 2.284 1.449 1.718 1.249 1.97 1.526 1.024 1.015 1.142 1.149 1.162 1.168 1.114 1.21 1.065 1.238 1.282 1.255 1.302 1.227 1.759 1.209 2.041 1.278 1.525 1.152 1.788 1.399 1.341 1.471 1.336 1.79 1.334 2.168 1.437 1.697 1.242 1.927 1.506 1.014 1.009 1.117 1.138 1.137 1.147 1.109 1.206 1.066 1.236 1.274
South Carolina 1.058 1.853 1.49 2.445 1.609 1.77 1.497 1.482 1.158 1.87 1.512 0.989 1.132 1.18 1.226 1.125 1.238 1.006 1.129 1.027 1.154 1.289 0.99 1.623 1.19 2.175 1.467 1.496 1.285 1.227 0.951 1.571 1.197 1.045 1.816 1.454 2.417 1.585 1.746 1.483 1.475 1.161 1.87 1.507 0.982 1.122 1.166 1.228 1.115 1.224 1.004 1.124 1.031 1.156 1.291
Virginia 2.078 1.59 1.548 1.692 1.617 2.605 2.091 1.808 1.981 2.541 1.655 1.636 1.445 1.449 1.509 1.443 1.744 1.7 1.608 1.565 1.838 1.522 1.905 1.38 1.418 1.349 1.51 2.447 1.943 1.695 1.883 2.444 1.561 1.615 1.381 1.429 1.545 1.375 1.817 1.727 1.633 1.576 1.853 1.461 1.171 1.229 1.245 1.346 1.176 1.389 1.342 1.323 1.254 1.343 1.283
West Virginia 2.294 2.366 2.415 2.351 2.333 2.646 2.801 2.437 2.383 2.737 2.353 1.709 2.132 2.15 2.104 2.057 2.352 2.352 2.163 2.096 2.225 1.871 1.731 2.089 2.197 2.052 2.027 2.355 2.486 2.113 2.106 2.251 2.1 2.294 2.366 2.415 2.351 2.333 2.646 2.801 2.437 2.383 2.737 2.353 1.709 2.132 2.15 2.104 2.057 2.352 2.352 2.163 2.096 2.225 1.871
East South Central 1.604 1.75 1.764 1.676 1.704 1.851 1.899 1.963 1.825 2.505 2.408 1.403 1.413 1.476 1.455 1.318 1.502 1.546 1.355 1.417 1.691 1.626 1.403 1.547 1.588 1.519 1.577 1.748 1.788 1.825 1.698 2.332 2.332 1.591 1.663 1.726 1.661 1.771 1.757 1.807 2.029 1.785 2.291 2.256 1.353 1.34 1.392 1.392 1.275 1.428 1.469 1.326 1.374 1.588 1.51
Alabama 1.973 2.04 2.021 1.759 1.92 1.959 1.783 3.499 1.378 2.28 2.281 1.666 1.675 1.625 1.541 1.403 1.488 1.097 1.372 1.161 1.973 1.481 1.735 1.97 1.842 1.492 1.754 1.744 1.528 3.364 1.58 2.151 1.972 1.447 1.476 1.699 1.571 1.959 1.522 1.41 2.381 1.43 1.448 1.574 1.22 1.139 1.244 1.167 1.07 1.174 1.1 1.13 1.08 1.159 0.979
Kentucky 1.508 1.664 1.595 1.467 1.336 1.782 1.617 1.354 1.527 1.707 1.859 1.309 1.347 1.334 1.273 1.094 1.269 1.389 1.102 1.132 1.278 1.129 1.256 1.368 1.311 1.216 1.148 1.56 1.425 1.225 1.322 1.525 1.657 1.502 1.65 1.588 1.457 1.347 1.785 1.61 1.351 1.529 1.781 1.903 1.305 1.342 1.332 1.261 1.096 1.27 1.383 1.1 1.131 1.3 1.167
Mississippi 1.729 2.042 2.148 1.861 2.121 1.733 2.012 2.379 2.29 2.168 2.627 1.386 1.371 1.809 1.634 1.486 1.604 1.587 1.407 1.494 1.729 2.113 1.55 1.761 1.928 1.918 2.319 1.87 2.154 2.374 2.468 2.254 2.932 1.708 1.714 1.969 1.927 2.196 1.762 2.096 2.513 2.367 2.429 2.717 1.316 1.238 1.579 1.712 1.571 1.633 1.607 1.487 1.556 1.967 2.142
Tennessee 1.681 1.779 1.787 1.806 1.865 1.956 2.134 2.128 2.007 3.326 2.803 1.572 1.504 1.504 1.571 1.473 1.704 1.783 1.539 1.69 1.988 1.891 1.524 1.668 1.738 1.707 1.753 1.896 2.065 2.005 1.824 3.073 2.773 1.767 1.803 1.769 1.78 1.806 1.901 2.151 2.14 2.019 3.196 2.812 1.526 1.552 1.49 1.566 1.469 1.689 1.794 1.573 1.706 1.949 1.898
West South Central 1.526 1.534 1.915 1.733 1.781 1.553 1.756 1.918 2.988 1.775 1.928 1.285 1.269 1.43 1.386 1.359 1.35 1.361 1.302 1.434 1.498 1.405 1.453 1.514 1.773 1.611 1.604 1.452 1.613 1.796 3.019 1.673 1.784 1.598 1.477 1.863 1.702 1.757 1.506 1.742 2.306 2.684 1.721 1.843 1.272 1.249 1.399 1.369 1.342 1.224 1.223 1.47 1.303 1.345 1.257
Arkansas 1.77 1.841 2.05 2.084 2.089 1.721 1.94 1.858 1.674 2.16 2.123 1.579 1.585 1.779 1.717 1.48 1.473 1.522 1.437 1.401 1.803 1.578 1.792 2.177 1.853 1.867 1.859 1.613 1.676 1.669 1.434 1.886 1.909 1.796 1.793 1.982 2.033 2.046 1.771 1.934 1.833 1.658 2.11 2.102 1.567 1.551 1.752 1.677 1.455 1.483 1.508 1.434 1.383 1.77 1.54
Louisiana 2.814 2.987 2.279 2.082 2.267 2.032 2.133 3.34 3.355 1.992 1.881 1.247 1.481 1.811 1.745 1.715 1.819 1.612 1.625 1.781 1.859 1.501 1.468 1.596 2.02 1.913 2.032 1.849 1.986 3.124 3.093 1.855 1.759 2.54 2.387 2.266 2.118 2.289 2.096 2.166 3.228 3.295 2.077 2.124 1.449 1.533 1.805 1.773 1.727 1.84 1.648 1.721 1.848 1.931 1.641
Oklahoma 1.727 1.117 1.87 1.69 1.463 1.449 1.6 1.787 1.519 1.452 2.079 1.222 1.085 1.282 1.296 1.184 1.202 1.338 1.199 1.272 1.264 1.134 1.416 0.94 1.582 1.352 1.184 1.218 1.271 1.428 1.163 1.169 1.713 1.547 1.075 1.782 1.582 1.445 1.331 1.53 2.111 1.4 1.442 1.862 1.007 1.027 1.174 1.253 1.151 1.134 1.149 1.101 1.244 1.266 1.143
Texas 1.426 1.494 1.843 1.638 1.691 1.428 1.66 1.636 3.33 1.704 1.889 1.253 1.21 1.338 1.295 1.3 1.24 1.281 1.223 1.382 1.399 1.39 1.397 1.466 1.733 1.547 1.531 1.348 1.549 1.543 3.525 1.656 1.777 1.537 1.441 1.781 1.599 1.667 1.389 1.672 2.222 2.9 1.654 1.763 1.241 1.187 1.308 1.27 1.283 1.089 1.118 1.486 1.201 1.203 1.175
Mountain 1.057 0.97 1.046 1.08 1.117 1.006 1.015 1.017 1.131 1.044 0.966 0.964 0.887 0.928 0.901 0.896 0.855 0.901 0.837 0.905 0.905 0.848 0.989 0.885 0.991 1.007 1.032 0.902 0.934 0.966 0.981 0.963 0.884 1.043 0.96 1.072 1.09 1.126 1.023 1.026 1.026 1.195 1.061 0.989 0.949 0.88 0.938 0.908 0.897 0.865 0.908 0.844 0.958 0.916 0.863
Arizona 0.816 0.844 0.857 0.839 0.867 0.917 0.865 0.797 1.055 1.024 0.951 0.762 0.717 0.776 0.756 0.562 0.582 0.748 0.742 0.813 0.871 0.788 0.708 0.788 0.789 0.781 0.81 0.823 0.782 0.75 0.988 0.979 0.916 0.824 0.84 0.857 0.833 0.885 0.943 0.886 0.818 1.22 1.053 0.984 0.762 0.717 0.776 0.751 0.575 0.611 0.775 0.767 0.973 0.897 0.817
Colorado 1.183 0.974 1.013 1.168 1.214 0.965 1.112 1.032 1.139 1.041 0.925 1.094 0.956 0.92 0.935 0.899 0.915 0.882 0.873 0.915 0.923 0.873 1.004 0.943 0.938 1.008 1.028 0.873 1.028 0.957 1.005 0.97 0.85 1.087 0.927 1.011 1.155 1.193 0.973 1.079 0.998 1.103 1.031 0.915 0.996 0.909 0.911 0.924 0.875 0.897 0.858 0.847 0.892 0.917 0.865
Idaho 1.642 1.266 1.668 1.338 1.697 1.198 1.243 1.589 1.779 1.168 1.071 1.395 1.148 1.418 1.16 1.615 1.094 1.144 1.211 1.235 1.091 0.985 1.376 1.116 1.455 1.231 1.574 1.096 0.961 1.173 1.222 0.815 0.757 1.644 1.287 1.744 1.351 1.693 1.198 1.243 1.589 1.779 1.168 1.071 1.395 1.156 1.424 1.179 1.615 1.094 1.144 1.211 1.235 1.091 0.985
Montana 1.433 1.188 1.694 1.259 1.551 1.192 1.345 1.343 1.621 1.398 1.052 1.274 1.128 1.446 1.136 1.361 1.182 1.237 1.055 1.348 1.214 1.052 1.375 1.104 1.574 0.944 1.528 0.802 1.022 1.143 1.133 1.059 0.852 1.363 1.134 1.752 1.262 1.575 1.278 1.327 1.364 1.706 1.376 1.068 1.274 1.128 1.446 1.136 1.361 1.183 1.243 1.057 1.341 1.203 1.055
Nevada 0.617 0.702 0.731 0.835 0.905 0.976 0.815 0.722 0.837 0.984 0.942 0.58 0.632 0.557 0.735 0.811 0.813 0.773 0.582 0.669 0.722 0.745 1   1.751 1.36 1.033 1.443 0.88 0.558 0.061 1.953 1.131 0.617 0.702 0.731 0.835 0.905 0.976 0.815 0.722 0.837 0.984 0.942 0.58 0.632 0.557 0.735 0.811 0.813 0.773 0.582 0.669 0.722 0.745
New Mexico 0.975 0.812 0.961 1.34 1.242 1.113 1.113 0.92 1.239 1.089 1.102 0.897 0.795 0.905 1.016 1.061 1.098 1.028 0.865 1.04 0.963 0.908 0.797 0.261 0.389 0.928 0.876 0.899 0.934 0.86 1.074 1 0.966 1.04 0.846 1.13 1.452 1.297 1.146 1.213 1.01 1.446 1.166 1.242 0.924 0.825 1.033 1.117 1.094 1.118 1.098 0.933 1.218 1.005 0.997
Utah 1.461 1.373 1.363 1.313 1.075 1.008 1.001 1.319 0.912 0.858 0.912 1.313 1.211 1.223 0.972 0.957 1.005 0.935 0.87 0.857 0.82 0.866 1.237 1.139 1.421 1.357 1.079 1.022 1.014 1.316 0.922 0.857 0.919 1.352 1.356 1.35 1.31 1.065 1.019 0.998 1.32 0.934 0.887 0.916 1.289 1.193 1.219 0.964 0.945 1.017 0.941 0.882 0.873 0.854 0.879
Wyoming 1.852 1.565 1.505 1.511 1.685 1.319 1.455 1.892 1.131 1.286 0.935 1.574 1.496 1.444 1.356 1.615 1.19 1.37 1.089 0.959 1.146 0.825 1.522 1.297 1.258 1.445 1.542 1.148 1.419 1.703 1.102 1.244 0.915 1.814 1.501 1.486 1.488 1.662 1.269 1.49 1.836 1.163 1.332 0.994 1.574 1.496 1.444 1.356 1.615 1.19 1.285 1.024 0.897 1.074 0.77
Pacific Contiguous 0.865 1.04 1.019 1.052 1.294 0.983 1.226 1.134 1.412 1.306 1.295 0.792 0.878 0.809 0.898 0.887 0.845 0.847 0.875 1.016 1.091 1.035 0.833 1.023 0.994 1.033 0.886 0.612 0.908 0.696 0.979 1.224 1.215 0.857 1.033 1.047 1.056 1.293 0.993 1.223 1.119 1.396 1.29 1.284 0.785 0.883 0.822 0.9 0.9 0.846 0.85 0.873 1.008 1.078 1.027
California 0.839 0.914 0.916 1.014 1.275 0.958 1.259 1.093 1.315 1.259 1.409 0.8 0.873 0.816 0.923 0.884 0.857 0.872 0.883 1.042 1.146 1.097 0.847 0.94 0.933 1.022 0.771 0.504 0.869 0.443 0.8 1.221 1.393 0.833 0.911 0.925 1.027 1.284 0.955 1.261 1.077 1.309 1.248 1.397 0.798 0.873 0.833 0.938 0.894 0.854 0.876 0.879 1.033 1.127 1.086
Oregon 0.817 1.346 1.051 1.105 1.344 0.9 0.989 1.13 1.604 1.311 0.808 0.661 0.88 0.711 0.778 0.859 0.795 0.747 0.749 0.758 0.804 0.738 0.677 1.061 1.026 1.029 1.302 0.842 0.919 1.075 1.473 1.215 0.753 0.792 1.271 1.006 1.091 1.318 0.916 0.996 1.142 1.571 1.288 0.825 0.663 0.869 0.717 0.776 0.867 0.804 0.745 0.753 0.764 0.813 0.751
Washington 1.085 1.673 1.702 1.243 1.367 1.168 1.205 1.327 1.756 1.52 1.05 0.846 0.912 0.842 0.83 0.925 0.817 0.783 0.91 1.035 0.99 0.915 0.913 1.502 1.342 1.098 1.229 0.989 1.066 1.138 1.45 1.24 0.725 1.025 1.513 1.701 1.172 1.321 1.211 1.174 1.302 1.692 1.481 1.025 0.786 0.947 0.826 0.782 0.946 0.827 0.779 0.906 1.024 0.991 0.908
Pacific Noncontiguous 2.298 2.259 2.057 1.67 1.713 2.26 1.744 1.494 2.372 4.959 3.374 1.432 1.57 1.481 1.309 1.45 1.954 1.307 1.436 1.723 3.406 2.366 2.323 2.722 2.55 1.487 1.625 1.781 1.443 1.129 1.778 3.431 2.503 2.175 2.344 2.873 2.028 1.955 2.389 2.102 1.581 1.799 2.341 2.127 1.572 1.787 1.663 1.556 1.45 1.954 1.307 1.436 1.335 1.745 1.595
Alaska 2.298 2.259 2.319 2.111 1.574 2.931 1.92 1.968 2.372 4.959 3.26 1.432 1.57 1.531 1.858 1.826 2.603 1.588 2.218 1.723 3.406 2.366 2.323 2.722 2.55 2.444 1.548 2.345 1.578 1.501 1.778 3.431 2.503 2.302 2.484 2.555 2.261 1.709 3.137 2.192 2.195 2.132 3.523 2.701 1.432 1.57 1.531 1.858 1.826 2.603 1.588 2.218 1.723 3.406 2.366
Hawaii     1.911 1.3 1.794 1.867 1.64 1.207     3.922     1.454 1.002 1.295 1.688 1.192 1.112             1.049 1.657 1.549 1.387 0.975       2.13 2.307 2.986 1.897 2.092 1.959 2.05 1.217 1.6 1.647 1.788 1.605 1.845 1.711 1.444 1.295 1.688 1.192 1.112 1.199 1.195 1.398
U.S. Total 1.187 1.257 1.275 1.327 1.42 1.34 1.332 1.385 1.436 1.426 1.348 0.994 1.038 1.073 1.082 1.023 1.051 1.04 1.013 1.039 1.09 1.022 1.113 1.202 1.163 1.23 1.254 1.193 1.189 1.238 1.294 1.315 1.242 1.2 1.22 1.246 1.292 1.394 1.325 1.325 1.44 1.425 1.405 1.333 0.992 1.019 1.046 1.062 1.007 1.028 1.017 1.037 1.025 1.064 0.999

SAIFI = System Average Interruption Frequency Index. It is the number of non-momentary electric interruptions, per year, the average customer experienced.
IEEE refers to the IEEE 1366-2003 or the IEEE 1366-2012 standard. 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.
Loss of Supply Removed excludes outages due to loss of supply from the high-voltage/bulk power system.
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.