Nanosolar Inc., a Palo Alto, Calif.-based provider of lower-cost solar energy panels, has received a $20 million grant from the U.S. Department of Energy. The company has previously raised VC funding from such firms as Mohr, Davidow Ventures, Benchmark Capital, Mitsui & Co., Onpoint, SAC Capital, GLG Partners, Swiss Re and Grazia Equity. www.nanosolar.com