THE joint-venture partner of Yiu Wing International Holdings has formulated strategies to capitalise on China's critical power shortage. China Changjiang Energy Corp (Group) president Yu Zhian said in order to help customers save money, the venture, Changfa Electric Equipment Co, had begun producing generators that could serve as heating and cooling systems as well as producing electricity. Another strategy involves constructing power plants which not only produce high-quality electricity with low-grade coal, but have the capacity to recycle coal ash to make cement for construction projects. Mr Yu said power stations that could use low-grade coal were particularly attractive to China's southern provinces, where coal reserves were scarce. In an effort to help China conserve resources, the company has built a plant in Beijing to extract more than 400 kg of petroleum, more than 300 kg of black carbon and about 14 cu metres of liquid gas from one tonne of old tyres. In Southeast Asia, the firm is installing water-driven turbine generators to take advantage of free-flowing rivers. Where water power is non-existent, the company can help a region satisfy its energy needs by installing coal-powered steam turbines. By 2000, Mr Yu said he expected to have built ''several dozen'' power stations in China and Southeast Asia. The company has a 52 per cent stake in the joint venture, with Yiu Wing owning the remainder. Yiu Wing, a listed diversified group, would provide capital and modern management strategies for plant construction, and assist Changjiang Energy in negotiating contracts overseas, said executive director Andrew Lee.