Since 1969, ULB’s Stationary and Portable load banks have been successfully implemented in several of today’s demanding Aircraft, Military and Industrial applications. As the world leader in load banks for the Aerospace industry, we now offer a complete line of load banks for the power generation market. What is a Load Bank? A load bank is a device which develops an electrical load, applies the load to an electrical power source and converts the energy into waste heat. The purpose of a load bank is to mimic the operational or “real” load that a power source will see in actual use.