The document discusses sources of biomass and its potential usage in Saudi Arabia. It outlines various solid biomass resources available, including agricultural residues, food processing waste, municipal solid waste, and animal waste. It notes that Saudi Arabia generates over 15 million tons of solid waste annually. The document proposes converting biomass to biogas, syngas, and biofuels like bioethanol and biodiesel through processes like anaerobic digestion and gasification to use as transportation fuels and generate power. It concludes that Saudi Arabia has significant potential to utilize waste-to-energy technologies to transform its energy and waste management.