Shanshan Qian

Biomass produces 5% of total primary energy use in the U.S. in 2019.  Of that 5%, 46% was from wood and wood-derived biomass, 45% was from biofuels, and 9% from the biomass in municipal wastes.  It is not the cleanest energy source among the renewables as burning biomass releases carbon monoxide into the air.  Additionally, cutting trees for generating energy or using land for plants solely for biomass energy pose issues with environmental problems and efficient land use.    

Hot dry rock (differ from geothermal) appears the most exciting solution if technical problems with drilling to great depths in very hot rocks and the costs associated with them are solved.  There are huge volumes of very hot rocks at depths of 5km or so, and a large amount of electrical power can be produced by a moderately sized station.