Due to climate change, fossil fuel prices, environmental pollution, and the increasing energy demands, exploring alternative energy sources is unavoidable. To align with the European Green Deal, energy supply needs to be both environmentally sustainable and economically viable. Solar energy is considered an inexhaustible and cost-effective option. Deciding to invest in solar power plants, it is necessary to obtain all required permits for construction and grid connection. Given the incentives and subsidies available, building solar power plants is a financially sound choice for sustainable energy planning. Depending on consumption levels, the investment payback period ranges from five to eight years. With ongoing technological advancements, the efficiency and lifespan of solar panels are continually improving, further enhancing the profitability of this investment On the example of self-use photovoltaic systems project “Podravka” are described all laws, regulations, standards, technical requirements for construction, energy supply, certain of technical conditions in electrical grid as well as fire protection and safety rules which must be followed during design and construction photovoltaic systems.