An automated mobile power system is capable of storing energy in electrical, hydraulic and pneumatic subsystems for driving a range of interchangeable tools. The system charges three storage means: electrical batteries for providing electrical energy, a hydraulic accumulator for providing hydraulic energy, and an air accumulator for providing pneumatic energy. A small diesel engine provides power to recharge each subsystem as needed. Between recharging cycles, the engine is shut down. A controller unit enables use of the apparatus in one of an automatic mode, which starts and stops the engine automatically based on a plurality of sensors that detect when a recharge is necessary, or a manual mode. The apparatus may also provide a heating unit capable of heating the work area. Preferably the apparatus is either mounted into a standard pick-up truck, service body, or flat-bed vehicle, or contained in a compact housing for easy transport.