BEIJING (XFN) – Standard & Poor’s Equity Research said it retains its ‘buy’ rating on Huaneng Power International Inc (SH A 600011; HK 0902; NYSE HNP), China’s largest independent power producer, and has raised the company’s twelve-month price target to HK$7.8 from HK$7.4. (US$1=HK$7.78). “Huaneng Power is still among the best poised to record relatively…