Is it the grid and the possibility of another great blackout (due to a lack of breakers)?

Is it the unpredictable terrorist act that could blow up a pipeline in North America (which includes friendly Canada)?

No, it's Sciurus Carolinensis!

One little squirrel in one little circuit-breaker in one little substation can knock out power to 9,000 homes with a single nibble, as FirstEnergy customers in North Royalton found out on Tuesday.

Maybe Dark Verne has the right idea when he thinks we need to Get Rid of that Squirrel!.