Iberdrola S.A. revenue for the last year amounted to 54.45 B USD, the most of which — 33.21 B USD — came from its highest performing source at the moment, Customers, the year earlier bringing 37.39 B USD. The greatest contribution to the revenue figure was made by Spain — last year it brought Iberdrola S.A. 20.24 B USD, and the year before that — 24.59 B USD.