A post launch pressurized gas production system and method includes a cell containing a pressurized gas producing medium, such as anhydrous sodium bicarbonate producing CO2 gas when heated. A plenum tank is in fluid communication with the cell. A heater heats the cell to produce gas delivered to the plenum tank storing the gas therein under pressure. A pressure vessel includes a propellant therein pressurized by the gas and in fluid communication with a thruster for delivery of the propellant to the thruster after pressurization by the gas.