This report applies the PAFER to Mexico’s Agency for Safety, Energy and Environment and assesses its functions, practices and behaviour. It focuses on internal governance, including structures and processes for decision making, managing financial resources, attracting and retaining talent, managing data and assessing performance. The review identifies a number of challenges and opportunities for improvement, and is a companion to reviews of the internal governance of two other Mexican energy regulators, the National Hydrocarbons Commission and the Energy Regulatory Commission, and the review of the external governance of the country’s energy sector, Driving Performance of Mexico’s Energy Regulators.