JAKARTA: Environmental groups raised concerns Thursday over a $6 billion Indonesian EV battery megaproject backed by Chinese giant CATL which is set to open on a once-pristine island, as Jakarta exploits its huge supply of nickel.

Indonesia is both the world’s largest nickel producer and home to the biggest-known reserves, and a 2020 export ban has spurred a domestic industrial boom.

Indonesian President Prabowo Subianto will inaugurate the project — also backed by China’s Zhejiang Huayou Cobalt and Indonesia’s state-owned Antam — in the east of Halmahera in Indonesia’s Maluku islands on Sunday.

The complex will encompass a process from nickel mining to production of cathodes, state news agency Antara reported.

But NGOs say Indonesia and the Chinese firms involved have not given assurances about environmental protections at the site, located just kilometers from a huge industrial park where spikes in pollution and deforestation have been reported.