 Moodys Investors Service has assigned a first-time A2 issuer rating to Huaneng Power International, Inc. HPI. At the same time, Moodys has assigned a A2 senior unsecured rating to the proposed guaranteed bond to be issued by Sinosing Services Pte. Ltd., an indirect wholly owned subsidiary of HPI. The ratings outlook on both the issuer rating and the senior unsecured rating is stable. 