The ENGIE is the fourth biggest operator in the natural gas market with more than a million clients and is the seventh largest producer of electricity with 4.5 GW of installed electrical capacity.


The Gelsia Group was founded on 1 January 2008, the heir to the experience and history of municipal agencies that had provided the main public services to the citizens of Brianza since the early years of the 20th century.


Illumia is an Italian family and is part of the Tremagi Group. Long engaged in energy trading, it officially became a supplier of electricity and gas in 2006, the year the market was deregulated.