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Working gas

Working gas:  The quantity of natural gas in the reservoir that is in addition to the cushion or base gas. It may or may not be completely withdrawn during any particular withdrawal season. Conditions permitting, the total working capacity could be used more than once during any season. Volumes of working gas are reported in thousand cubic feet at standard temperature and pressure.

Working gas capacity:  The amount of total natural gas storage capacity that can used to store natural gas available for withdrawal.