HNP [HUANENG POWER INTERNATIONAL] 6-K: (Original Filing)
[This Form 6-K consists of: THIS SUPPLEMENTAL CIRCULAR IS IMPORTANT AND REQUIRES YOUR IMMEDIATE ACTION If you are in any doubt If you have sold or transferred (Stock Code: 902) THE SUPPLEMENTAL CIRCULAR TO THE CIRCULAR TO SHAREHOLDERS DATED 28 APRIL 2017 RELATING TO THE ADDITIONAL PROPOSAL TO ELECT M]