SUNNYVALE -- A prominent Silicon Valley clean-energy startup has been ordered to pay back wages and penalties for bringing in workers from Mexico and paying them about $2.66 an hour in pesos, the U.S. Department of Labor announced Tuesday. Sunnyvale-based Bloom Energy, which makes fuel cells and sells energy to clients including AT&T, Adobe, Coca-Cola, eBay, Google and Wal-Mart, was ordered by a judge to pay $31,922 in back wages and an equal amount in damages to 14 welders who were brought in to work alongside domestic workers refurbishing power generators. It followed a federal investigation that inspected records from...