PORTLAND, Ore. (AP) — A renewable energy facility in Oregon that combines solar power, wind power and massive batteries to store the energy generated there has officially opened as the first utility-scale plant of its kind in North America. Clean energy experts say the project, which can power 100,000 homes, addresses some key challenges facing the industry as the U.S. transitions away from fossil fuels. Interest in on-site battery storage to even out production from solar or wind generation has soared, but the combination of wind, solar and storage batteries at one location promises to make the Wheatridge Renewable Energy Facility in Lexington particularly efficient.