MILLBRAE, Calif.--(BUSINESS WIRE)--Stem, Inc., a leading provider of intelligent energy storage, today announced the close of its Series C funding round at $45 million in total. The second tranche in the round was led by RWE Supply & Trading, the energy trading arm of Germany-based RWE Group, one of Europe’s largest electricity and gas companies. RWE Supply & Trading will also take a seat on Stem’s board of directors to support the company’s evaluation of new markets. Backing from RWE i