From Rich Galenโ€™s Mullings today:

ยท The North American Energy Reliability Council which tracks such things has determined that, including last week, there have been seven grid failures since the big one on November 9, 1965.

ยท None lasted for more than a day.

ยท Letโ€™s go to the blackboardโ€ฆ

ยท The number of days between November 8, 1965 and August 14, 2003 is 13,793.

ยท The number of days in which some portion of the national power grid failed during that period is 7.

ยท Dividing 13,793 by 7 we get 0.000507504

ยท Moving the decimal two places to the right (and rounding up) we get a failure rate of 51 THOUSANTHS of one percent.

ยท Stating it the other way, the power grid (which was described by former Secretary of Energy Bill Richardson as being like one in a โ€œthird world countryโ€) has been up 99.949 percent of the time over the past 37 years.