Photovoltaic panels are the most frequently chosen form of renewable energy generation among owners of single-family houses and households. The favorable form of settlements and deduction of costs caused a boom in the installation market. In 2020, 600,000 installations were installed in Poland, and the government’s goal was 1 million in 2040. It seems that we will achieve this goal and exceed it in 2021. According to various calculations and depending on the size of the installation, a return on investment can be assumed within 5 to 7 years. In short, for the next 18-19 years, prosumers will be able to almost forget about energy costs.