Base gas (or cushion gas) is the volume of natural gas intended as permanent inventory in a storage reservoir to maintain adequate pressure and deliverability rates throughout the withdrawal season.
Working Storage gas refers to Total Storage gas volume - Base Storage Gas.
Please contact customer support if you have any further questions - RBAC, Inc. support line (281) 506-0588 ext. 125, from 9:00 am to 5:00 pm CT