The 380-metre tall pylon will be four times the height of London's iconic Big Ben, the state-run Xinhua news agency reported.
The pylon will carry power cables between Zhoushan's Jintang and Cezi islands, a distance of 2,656 metres, the power company's Zhoushan branch said in the announcement.
It is set to break the world record for the tallest power pylon currently held by China's Damaoshan pylon which stands at 370 meters, also in Zhoushan.
The project is expected to completed by the end of 2018, and will be put into use in 2019, Xinhua said.