Fuel Cells
It may appear illogical to include fuel cells among renewables. While they combine what are effectively-inexhaustible resource of hydrogen and oxygen in the generation of electricity, plus heat and water vapour, in practice hydrogen is usually extracted from a hydrocarbon fuel such natural gas, a process that generates CO2. Depending on your definition of a renewable, the nearest you get is extracting hydrogen from the methane from waste tips. Though a future possibility is to use regenerative fuel cells as batteries in electricity generation from wind, PC or CHP.
It may appear illogical to include fuel cells among renewables. While they combine what are effectively-inexhaustible resource of hydrogen and oxygen in the generation of electricity, plus heat and water vapour, in practice hydrogen is usually extracted from a hydrocarbon fuel such natural gas, a process that generates CO2. Depending on your definition of a renewable, the nearest you get is extracting hydrogen from the methane from waste tips. Though a future possibility is to use regenerative fuel cells as batteries in electricity generation from wind, PC or CHP.
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