Supply potential and annual availability of timber and forest biomass resources for energy considering inter-prefectural trade in Japan

•Timber and forest biomass resource availability estimated with inter-prefectural trade.•Appropriate harvesting system determined based on topography.•CTL has highest productivity and lowest cost; annual availability is highest under CTL.•Thinning and additional regeneration subsidies enhance availability.•Subsidy plays an important role in the supply of timber and forest biomass resources.