Indonesia, the world's biggest thermal coal exporter, has allowed 37 loaded coal vessels to depart after they secured approvals from authorities, the Coordinating Ministry of Maritime and Investment Affairs said on Thursday.

In a statement, the ministry said an export ban implemented on Jan. 1 had been eased for miners that had met a requirement to sell a portion of their output for local power generation after the state utility procured enough coal at power stations to ensure 15 days of operations.

"I request that this is supervised closely so this also becomes a moment for us to improve domestic governance," Luhut Pandjaitan, coordinating minister for Maritime and Investment Affairs, said in the statement.