The present disclosure provides a method of managing the power requirements of a facility powered by fuel cells, the facility including: a primary system having a non-discretional load requirement; and one or more ancillary load consuming systems having a nominal load; at least one fuel cell to provide power to the primary system to meet the non-discretional load requirement and provide power to the one or more ancillary systems; and a control system configured to monitor the non-discretional load requirement and to control the supply of power to the primary system and to the one or more ancillary load consuming systems. The method includes: detecting a change in the non-discretional load requirement; adjusting the power supplied to the one or more ancillary load consuming systems from the nominal load to meet the change in the non-discretional load requirement; and providing power to the primary system to meet the changed non-discretional load requirement.