SunPower Corp. (Nasdaq: SPWRA, SPWRB), a manufacturer of high-efficiency solar cells, solar panels and solar systems, announced today that it is building a 1.3-megawatt solar power plant in the Lazio region of Italy for Solar Green Energy-SGE, a joint venture between EDF-EN Italia, a subsidiary of EDF Energies Nouvelles, and Emmecidue, an Italian project developer.