A2A S.p.A. is an Italian company, organised as a società per azioni, that generates, distributes, and markets renewable energy, electricity, gas, integrated water supply, and waste management services.

[3] A2A was formed on 1 January 2008 by the merger of three Northern Italian municipality-owned utilities.

1907), both of Milan, and Azienda dei Servizi Municipalizzati [it] (ASM, est.

As of early 2023, it remains partially owned by the Municipalities of Milan and Brescia (25% ownership each).

[5] A2A is listed on the Borsa Italiana and is a member of the FTSE MIB index.