In recent years’ technology have made a huge development leap. As technologies are developing, the prices for them are decreasing and renewable energy technologies becomes more available for households. For residential buildings, when using renewable energy technologies, the unused electricity goes to waste and is not used by anyone. For this reason, the NET payment system was introduced, where net metering can be conducted. But, as in every system, there are loopholes that need to be resolved and there is still potential to optimize the system to improve overall efficiency. The aim of the research was to evaluate and improve end-user involvement in single energy system to promote overall energy efficiency and the use of renewable energy. The way to do it is to evaluate existing solar PV system in microgeneration regime and potentially optimize end-user behavior, energy use patterns and integrate technical improvements, such as new inverter, accumulation tank for hot water and visible metering system. Because of optimization with changed inverter, additional accumulation tank and visible metering system, household self-consumption of energy from solar PV increased from 31.21 % to 79.85 % from total energy produced.