Some time ago I wrote advocating tying together the three major US power grids with DC inter-ties. I am happy to see today that that has in fact been done.

     DC inter-ties are more efficient over distances greater than about 300 miles,immune to the effects of solar induced or nuclear induced magnetic interference, and do not require the networks be phase synchronized.

     This allows load peaks to be distributed over a wider geographical area, flattening the peak somewhat because of the varying time zones.