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Verizon's fuel cells use natural gas piped in from a local gas company to obtain the hydrogen atoms for the chemical process. The natural gas is not burned. Instead, the hydrogen atoms are detached from the gas as it is fed into each of the seven cells, and then combined with oxygen atoms from the air to generate direct current electrical power. Heat and water are then vented from each cell, and direct current is converted to alternating current electricity for use in the building.