Unión Fenosa S.A. is a large Spanish company dedicated to the production and distribution to end users of gas and electricity. It has installed capacity of 11 120 megawatts of power and 8.9 million customers. The headquarters are in Madrid and the chairman is Pedro López Jiménez. Formerly a constituent of the IBEX 35 index the company is a part of the Gas Natural group.
Key people are Salvador Gabarró and Honorato López Isla.