In recent years, negative phenomena of an external and internal nature have been observed that threaten the security of Polish municipalities. The increase in energy prices had a negative impact on the situations of consumers and companies. Strengthening energy security can be achieved through the development of an energy community based on renewable energy. The aim of the article is to demonstrate that energy cooperatives have a negligible impact on the energy and economic security of Polish municipalities. The article is based on literature studies and analysis of data obtained from the National Center for Agricultural Support and the Central Statistical Office, as well as our own qualitative research. Based on the research, three hypotheses were formulated: Firstly, energy cooperatives participate to a limited extent in building local energy security. Secondly, cooperatives should be treated as a complement to coal power plants. Thirdly, only the involvement of municipal authorities in the energy cooperatives can strengthen local energy security. The research shows that there has been a quantitative development of energy cooperatives, but this has not significantly improved local energy security. Only the active participation of local authorities is a condition for strengthening the role of energy cooperatives in ensuring economic and energy security.