Several organizations are investigating batteries. http://www.popsci.com/technology/article/2010-04/texas-town-turns-monster-battery-backup-power http://www.po

Several organizations are investigating batteries. http://www.popsci.com/technology/article/2010-04/texas-town-turns-monster-battery-backup-power http://www.popsci.com/technology/article/2010-04/texas-town-... There are also more traditional 1-2MW batteries that fit in tractor-trailers, etc.