World's largest solar energy base station cluster set up in Tibet China Mobile (CM), the country's leading telecommunication operator, has established the world's largest solar energy-powered base station cluster in Tibet Autonomous Region, following a four-year construction. By the end of April, CM had set up at least 1,000 base stations in Tibet, with 78.79 percent powered by solar energy. The ratio is expected to have reached 90 percent by the end of 2010, said Dai Zhong, general manager of the Tibet Co. Ltd. of the CM Group.