What are the top diversified renewable power producer companies in China, and how do they compare in terms of installed capacity, energy mix (including wind, solar, hydro, and nuclear), geographic reach, and overall contribution to the national power grid? Additionally, how do major state-owned enterprises and leading players such as China Yangtze Power, China Longyuan Power Group, Huaneng Power International, and Datang International Power Generation influence market growth, technological innovation, and the transition toward clean energy in China?