HONG KONG (AFX-ASIA) – UBS Warburg said it maintains its “strong buy” rating on Huaneng Power International Inc (902.HK), but said it has cut its price target to HK$6.60 from HK$8.80 amid the investment risks in the sector. (US$1=HK%7.87). The investment risks include political developments in the China power sector, lower tariffs, the regulatory environment,…