Huaneng Power International Inc. provided preliminary earnings guidance for the year ending December 31, 2011. Based on preliminary estimate of the company, it is expected that the net profit attributable to the company's shareholders under the PRC Accounting Standards for the period from January 1, 2011 to December 31, 2011 may decrease by more than 50% year on year. The decrease was mainly due to the rise of fuel cost and increase of the interest rate of RMB loans.