USA Today: As solar costs plummet, U.S. corporate giants including Apple, Google and Wal-Mart are turning to the sun to power stores, data centers and other facilities.
At a Wal-Mart store in Mountain View, Calif., on Friday, President Obama cited Wal-Mart's commitment to double the number of solar energy projects at its stores, Sam's Clubs and distribution centers nationwide by 2020. Obama announced 300-plus other private and public efforts, including new solar panels on the White House, to boost energy...