In this publication the validity of the implementation and operation of the microinstallations
of the renewable energy sources about a power of 3 kW for a photovoltaic
installation of roof and wind power plant. Examples of the technical solution researched
types of micro-installations have been proposed. It was estimated the value
of inputs to execute and run the installation, computed the profits from the sale
of electricity produced. Return time is specified to be incurred for the execution
of the installations.