[This Form 6-K consists of: (Stock Code: 902) 2013 Interim Results Announcement Consolidated operating revenue: RMB64.062 billion Profit attributable to equity holders of the Company: RMB5.623 billion Earnings per share: RMB0.40 INTERIM RESULTS The Board of Directors (the “Board”) of Huaneng Power International, Inc. (the “Company”) announces the unaudited operating results for the six months ended 30 June 2013 and]