Wal-Mart pairs with SolarCity to put panels on stores in California, Arizona

Shopping for discounts at Wal-Mart Stores Inc. is about to become even more of a sunny activity. The world’s largest retailer is pairing with SolarCity Corp., the country’s market leader in solar installations, to add panels to 20 to 30 stores in California and Arizona. That’s in addition to the 31 Wal-Mart locations, all in California or Hawaii, that already have solar rigged up. That leaves …