It delivered 850 mt of 380 CST grade bunker fuel to Zhoushan Wednesday, said the source.
The company had earlier planned to start deliveries in the first half of July, but delayed to August.
"Since it is a new port, we are quite cautious for the first order," said the source.
The supplier had also planned to start bunker fuel supply from Qingdao in east China in the second half of July, but this has not yet started because of the delay in the arrival of an import cargo, said the source.
The company will start supply from Qingdao in the second half of August, according to the source.
Besides Zhoushan, Brightoil currently supplies bunker fuel from the ports of Shenzhen in south China, and Shanghai and Ningbo in the east.
The start of supply from Zhoushan is a part of the company`s expansion plans.