JAKARTA, July 24 (Reuters) - Indonesia, the world's most significant palm oil producer, is evaluating fuel with a view to increasing to 40% from 35% the share of palm-oil combined into biodiesel next year, the energy ministry said.

If carried out, the B40 mandate could increase biodiesel usage to approximately 16 million kilolitres (KL) next year, the ministry stated, from 13 million KL approximated to be consumed in 2024.

"We hope the trials could be finished in December, so that complete implementation of B40 could be performed in 2025," energy ministry senior main Eniya Listiani Dewi stated in a statement on Tuesday.

The Indonesian Biofuel Producers Association (APROBI) stated the market had the capacity to fulfill B40 need, with set up capacity anticipated to increase to 20 million KL yearly next year from 18 million KL now.

"However we will require more raw products to satisfy B40 need," Ernest Gunawan, the secretary general of APROBI told Reuters on Wednesday.

The biodiesel market would require 13.9 million metric heaps of crude palm oil to produce 16 million KL biodiesel next year, from the approximated 11 million tons required this year, he included.

Indonesia's biggest palm oil association GAPKI said a in exports meant there would suffice raw products to supply the B40 required for now.

But the industry would need to assess "which one would be better", GAPKI chairman Eddy Martono stated, referring to the possibility an increase in exports would make supplying the domestic market less feasible.

Indonesia's palm oil output is estimated to reach 54.4 million heaps in 2024, a 2.26% increase from in 2015, while exports are expected to decrease by 2.47% to 29.5 million tons as domestic usage rose, driven by biodiesel mandate.

The ministry had tested the biodiesel, blended with 40% of palm oil, on a train for the first time previously this week, while preparing to evaluate the B40 mix on agriculture machinery, power plants and in the shipping industry, it said. (Reporting by Bernadette Christina and Dewi Kurniawati