Measurement and Verification (M&V) actions play a crucial role in evaluating the actual benefits achieved by energy efficiency projects. In the case of projects that include the implementation of solar generation systems, a crucial independent factor to consider is solar irradiation, which affects the amount of energy generated by the system. Given how important M&V is in energy efficiency projects, especially in projects that rely on solar irradiation, a study was conducted on projects with photovoltaic systems (PV) to assess the actual benefits of the project, and it is essential to carry out the measurement and verification (M&V) of the results, which include tracking and monitoring of generation and solar irradiation for a period of twelve months. With these actions, it will be possible to determine the actual savings achieved by the project and ensure that the benefits of solar energy are maximized.