Oman’s Overseas Oil and Gas LLC (OOG) is seeking new partners for developing a $15 billion new refinery in Bontang, East Kalimantan, according to OOG Chairman Khalfan Al Riyami, Reuters reported.

OOG owns 90% of the project and the Indonesian state energy company PT Pertamina holds the remaining 10%. Moreover, the company is in discussions with many investors; including Japan ’s Cosmo Oil International, a unit of Cosmo Energy Holdings.

OOG will decide on the project’s financing source within five months. The project, which consists of a refinery and petrochemical plants, is worth around billion, while Pertamina initially estimated the project cost at billion.

The company aims to increase the refinery’s production capacity of crude oil to 300,000 barrels per day (b/d).

The project is scheduled to start operation in around 2025-2026.