EDP Energias de Portugal is a utility company engaged as a generator, distributor and supplier of electricity in Portugal, and as an electricity generation company and a gas distributor in the Iberian Peninsula. In addition, Co. is a wind power operator with windfarms for energy generation in the Iberian Peninsula, the U.S., Canada, Brazil, France, Belgium, Italy, Poland and Romania and is engaged in developing wind projects in the U.K. Co. is also engaged in generating solar photovoltaic energy in Portugal, Romania and the U.S, and in Brazil it is engaged as an operator in electricity generation. As of Dec 31 2015, Co. had 9.7 million electricity customers and 1.4 million gas customers.

Iberdrola is a holding company. Through its subsidiaries, Co. operates in four segments: network business, which includes all the energy transmission and distribution activities, and other regulated activity originated in Spain, the U.K., the U.S. and Brazil; deregulated business, which includes electricity generation and sales businesses as well as gas trading and storage businesses carried on by Co. in Spain, Portugal, the U.K. and North America; renewable business, with activities related to renewable energies in Spain, the U.K., the U.S. and the rest of the world; and other businesses, including the engineering and construction businesses and the non-power businesses.