SunEdison plans to float 20 to 30 percent of the unit which, based on cash flow, could be valued at between $800 million and $1 billion, Brian Wuebbels, SunEdison's chief financial officer, told Reuters. By retaining a stake of up to 80 percent in the yield co, the parent company would retain the lion's share of the quarterly dividends. "It should help the parent companies strengthen their balance sheet," said Guinness, who holds shares in several solar companies, including Trina Solar Ltd, Yingli Green Energy Holding Co Ltd and SunPower Corp. CHINA RISK