Optimized delivery of electricity of domestic renewable electrical energy production devices to electric grid and consumption of electricity by households from electric grid

A method including the following steps: computing availability of at least one renewable electrical energy production device that delivers electricity to at least one household associated therewith to deliver electricity to an electric grid; computing an electricity usage plan for the predetermined period of time; optimizing the electricity usage plan so that: the electricity to be delivered is to be delivered to the electric grid at one or more different time periods at least when an amount of the possible electric power generation corresponding to non-renewable electrical energy generators is greater than at other time periods within the predetermined period of time; and during a predetermined duration after the time period or periods when the electricity is delivered to the electric grid, the electricity delivered by the at least one renewable electrical energy production device for consumption by the respective household is lower than the computed availability during the predetermined duration.