San Jose-based SoloPower announced Thursday that it is expanding -- to Oregon. The company, which makes thin-film solar cells and modules, has chosen Wilsonville, south of Portland, as the site for its new manufacturing plant. The start-up got a $20 million loan through Oregon's State Energy Loan Program, which also was announced Thursday. "The intention was always to have corporate here in Silicon Valley, and research and development here," said Peter Kesser, SoloPower's senior vice president for sales and marketing, in an interview. "But when we looked at scaling up, we looked at a number of areas, both here in...