From xinhuanet.com:
BEIJING, Dec. 5 (Xinhuanet) Following in the footsteps of billboards in Canada and Africa, a California electricity provider says it installed Americas first solar-powered billboard that makes more electricity than it uses.
billboard topped off with 20 solar panels is located at 1000 Brannan St. in San Francisco, and is visible from the Highway 101 9th Street exit.
energy that is collected by the solar panels actually exceeds the amount used by it on a day-to-day ....
Do It Yourself Solar
