Two hybrid solar/fossil-fuel endothermic processes, in which fossil fuels are used exclusively as the chemical source for H{sub}2 production, and solar energy as the source of high-temperature process heat, are considered: 1) the solar thermal decomposition; and 2) the solar steam gasification/reforming. These processes offer viable and efficient routes for fossil fuel decarbonization and CO{sub}2 avoidance. The advantages of the solar-driven process are three-folded: a) the discharge of pollutants is avoided; b) the gaseous products are not contaminated; and c) the calorific value of the fuel is upgraded.
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