Abstract: An electrical system and method for supplying electricity to a dwelling on a residential site. An energy management system selectively stores energy in an energy store and selects energy from at least one of a wind power system, a solar power system and a mains electrical source. The energy management system is arranged to: obtain weather data; estimate the amount of electricity the wind power system will generate; estimate the amount of electricity the solar power system will generate; estimate the amount of electrical energy the dwelling will require; determine a strategy for meeting the estimated energy requirements and using electricity; and control operation of an electric vehicle charger to selectively supply electricity from an electric vehicle battery to a consumer unit.