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

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

"We hope the trials might be ended up in December, so that full execution of B40 might be performed in 2025," energy ministry senior official Eniya Listiani Dewi stated in a declaration on Tuesday.

The Indonesian Biofuel Producers Association (APROBI) said the industry had the capability to meet B40 need, with installed capability anticipated to increase to 20 million KL each year next year from 18 million KL now.

"However we will need more basic materials to satisfy B40 need," Ernest Gunawan, the secretary general of APROBI informed Reuters on Wednesday.

The biodiesel market would need 13.9 million metric lots of unrefined palm oil to produce 16 million next year, from the estimated 11 million heaps needed this year, he included.

Indonesia's most significant palm oil association GAPKI said a decline in exports indicated there would be adequate basic materials to provide the B40 required in the meantime.

But the market would need to assess "which one would be better", GAPKI chairman Eddy Martono stated, describing the possibility a boost in exports would make supplying the domestic market less feasible.

Indonesia's palm oil output is approximated to reach 54.4 million tons in 2024, a 2.26% increase from in 2015, while exports are anticipated to decline by 2.47% to 29.5 million loads as domestic intake increased, driven by biodiesel mandate.

The ministry had actually checked the biodiesel, blended with 40% of palm oil, on a train for the very first time previously this week, while planning to test the B40 mix on agriculture equipment, power plants and in the shipping market, it stated. (Reporting by Bernadette Christina and Dewi Kurniawati