Under the Just Transition approach; repurposing or converting coal mines and Coal-Fired Power Plant (CFPP) can be a useful measure to meet both technical climate change and socio-economic objectives in a synergistic and cost-effective manner by reusing the CFPP and mine site for other generation technologies. The World Bank is seeking consultants to study potential repurposing options for the former Ombilin mining lands and the PLN-owned Ombilin CFPP. These options include biomass cofiring or conversion for the power plant; the installation of solar PV; pumped hydro storage; synchronous condensers (SYNCON) or battery energy storage systems (BESS); or combinations of the above. Studies on its implication to the grid and ancillary services; namely frequency; voltage control; and inertia that would support the development of renewables elsewhere in the system will be conducted in parallel. Objective:The objective of this pre-feasibility study (pre-FS) is to assess the technical feasibility of converting the Ombilin power plant (both units) to burn 100% biomass as one of the repurposing options included under the Climate Investment Funds-Accelerating Coal Transition (CIF-ACT) Investment Plan. The assessment will include: the biomass supply; the conversion of the two units of Ombilin to burn 100% biomass and the economic viability of the project.