 The State Grid Corporation and China Southern Power Grid paid a flat rate of ¥ 250 per MWh ( US $ 35 @.@ 7 ) until July 2 , 2008 . Since then , the price has varied by province , from ¥ 228 @.@ 7 – 401 @.@ 8 per MWh . Higher @-@ paying customers receive priority , such as Shanghai . Nine provinces and two cities consume power from the dam . 
