A method for managing a utility load by controlling electrical consumption of electrically powered devices. The first reflection member is arranged at a position to bend an optical path of an incident light flux to enter the image pickup optical system. A portion of the fluid in the loop system may be injected into the subterranean formation using one or more valves disposed in the loop system. The rolling device and rolling method can achieve three-dimensional curved surface rolling or thin sheet rolling of a sheet metal simply, quickly and at a low cost. The impulse waves are redirected between the first and second substantially straight impulse-wave-conductor portions by a structure of an intermediate angled portion located between, the first and second substantially straight impulse-wave-conductor portions. The function of this device is to recognize the requested data and thereby allow the audio file contents from the memory storage unit according to the instructions set to this device.