For standard daily operation, 100% of the power is supplied by the mains (PLN). To be able to avoid high tariffs during the peak time (6pm to 10pm), nine gas gen-sets are used in parallel with mains (PLN) to minimize supply from PLN. In case of mains failure, the system will start diesel gen-sets at first to let them cover the essential load. Then the ComAp power management system will automatically bring additional gas gen-sets on board to allow the connection of the non-essential load. The ComAp power management system constantly monitors the spinning reserve of the running gen-set, once there is enough power available, the non-essential load is connected.