The ERCOT report [0] on the 2011 Texas outage states, verbatim,
> "The winter weather event of February 1-5, 2011 was determined to be a one in ten year event for some regions of Texas in terms of low temperature extremes and duration."
Or, if you'd rather be kinder to Texas power generators while using the same report,
> "Taking these temperature extremes into account, and coupling them with the sustained winds of this event, it is estimated that the resultant [...] event suffered by many Texas generation facilities approached a one in 25 year severity."
With this decade-old report suggesting extreme cold may well occur roughly once per decade, I will respectfully follow up with: Never anticipated my ass.
[0] http://www.ercot.com/content/meetings/other/keydocs/2011/201...
No, the main problem there was a neighborhood situated in a highly flammable area in the middle of a forest.