UPDATE 1-China's State Grid buys biggest chunk of HK Electric's IPO-sources
* HK Electric offering 5.5-7.26 pct annualised yield * HK Electric set to be Hong Kong's biggest IPO since 2010 * Another sovereign wealth fund to join as cornerstone investor By Denny Thomas and Michael Flaherty HONG KONG, Jan 11 (Reuters) - Government-owned State Grid Co
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