Energy saving loads can not only achieve load functions, but also convert the DC power output from the tested power source into AC power through power electronic conversion technology and feed it back to the power grid for recycling, achieving the goal of energy saving. The energy-saving efficiency can reach over 80%, and it usually takes one to two years to recover the load cost through the saved electricity bills. In addition to saving electricity bills, energy-saving loads can also reduce the equipment cost of power distribution and lower the cost of air conditioning equipment required to emit load heat.