On April 3, 2007, Huaneng International Power Co., Ltd., a subsidiary of Huaneng Group that is listed in
USA, passed with zero defect the internal control audit of its financial report conducted by PWC, becoming
the first to pass SOX404 in the companies controlled by central enterprises and listed in USA.
Huaneng International officially started the all-round improvement of its internal control in February 2003
as required by SOX404 by drawing up an overall plan and setting a short-term goal: to obtain the audit
report on internal control issued by an external auditor with no reservation. The long-term goal is to
continuously enhance its development capability, competition capability and risk-resisting capability
through the all-round improvement of internal control to attain its strategic target.