No. | Category | % of Events | Mean Size in MW * | Customers Affected * |
---|---|---|---|---|
1 | Earthquake | 0.8 | 1,408 | 375,900 |
2 | Tornado | 2.8 | 367 | 115,439 |
3 | Hurricane/Tropical Storm | 4.2 | 1,309 | 782,695 |
4 | Ice Storm | 5 | 1,152 | 343,448 |
5 | Lightning | 11.3 | 270 | 70,944 |
6 | Wind/Rain | 14.8 | 793 | 185,199 |
7 | Other Cold Weather | 5.5 | 542 | 150,255 |
8 | Fire | 5.2 | 431 | 111,244 |
9 | Intentional Attack | 1.6 | 340 | 24,572 |
10 | Supply Shortage | 5.3 | 341 | 138,957 |
11 | Other External Cause | 4.8 | 710 | 246,071 |
12 | Equipment Failure | 29.7 | 379 | 57,140 |
13 | Operator Error | 10.1 | 489 | 105,322 |
14 | Voltage Reduction | 7.7 | 153 | 212,900 |
15 | Volunteer Reduction | 5.9 | 190 | 134,543 |