On Wed, 27 Jun 2012 16:54:03 -0700, "Califbill"
wrote:

The power grid has to stay AC. Was the big battle between Edison and Tesla.
The DC was short distance, and the losses were large.

===

Yes, for the most part. There has been some interesting work done
however using very high voltage DC for long distance transmission.
HVDC has been made possible by the development of high powered
semiconductors and has the advantage of fewer losses in some
environments. It also allows power to be transmitted between grids
that are out of phase with each other.

http://en.wikipedia.org/wiki/High-vo...direct_current