Am listening presently (0900 Mon 16 Nov) to Ted Koppel expounding on his book Lights Out on the Diane Rehm show; his thesis is that the internet will at some point successfully be used to bring down the US power grid which is, he correctly says, a lot more interconnected than many believe. Of his many points, he strongly believes DC has ignored this, mostly because of its overcomplexity. He claims there are three grids in the US: East, West and Texas. Not exactly correct but close enough. This is a perfect case for the desirability - necessity - for Powerwalls and their kin. There is an amusing irony here. Because our home in Alaska is infinitely (>80 miles) far from any power grid, we are about as fully self-independent as any fully-functioning household in, well, the world. Not only our own solar-plus-diesel-backup generation, but a 110kWh battery bank; many freezers with between months and years of food; our own water system, and so forth. So for 99.99% of the time, we live a life that is 'inferior' to what most consider normal - but not by much (umm - lousy internet connection aside...). The 0.01% of the time is when we become the envy of all others.