Gas supplies that are free to be sold to the highest bidder. They must be uncommitted, or committed under contract to a buyer for no longer than some short period (such as one year). They may be totally uncommitted to any buyer. In addition, they must be available to a pipeline's customers at delivered city-gate prices that are competitive enough to prevent the pipeline from exercising market power. In GAS INVENTORY CHARGE proceedings, the Commission has stated that there must be sufficient divertible gas supplies, as well as COMPARABILITY OF SERVICE, in order to find that the pipeline is operating in a competitive environment.