Indonesia's one-month ban on coal exports has been confirmed by sources in Singapore, but analysts are already questioning whether it will last.

The Ministry of Energy & Mineral Resources (ESDM) issued a policy that prohibits all Indonesian mining companies from exporting coal between 1 January and 31 January 2022, Singapore-listed Golden Energy & Resources said in a regulatory filing.

"ESDM stated that the temporary ban is due to concerns over critically low inventories at domestic power plants in Indonesia, which could lead to widespread blackouts in the country," the company said.