The present invention discloses a smart microprocessor and sensor based controller system that enables selective management of energy supply into a household of electrical appliances through individually switching on or off of individual load lines in a domestic household based on external information fed in from external sensors regarding the household's demand, time data and/or tariff data, wherein, based on the information received, the controller system manages the supply of energy to the household such that peak load of an electrical grid is reduced by selectively supplying electrical energy to high household loads, such as swimming pools, at low electrical grid demand time. The controller system includes smart switching devices, microprocessor logic, software algorithms, and timing devices used to control the switching processes.