Acciona is the parent company of a construction group. Co. is engaged in general construction activities in the areas of civil engineering and buildings, including railways, marine and hydraulic works, motorways and airports, town planning, conduits, pavements, parking lots, and industrial and urban buildings. In addition, Co. is engaged in the provision of real estate services, the operation of parking lots, telecommunications, services, ecology and alternative means of energy. Co.'s operations are organized in six business divisions: Infrastructures, Real Estate, Energy, Water, Environmental & Urban Services and Logistic & Transport Services.

EDP Renovaveis is a renewable energy company based in Spain. Co. is engaged in activities related to the electricity sector, namely the planning, construction, operation and maintenance of electricity generating power stations, especially hydroelectric, mini-hydroelectric, wind, solar, thermal solar, photovoltaic, biomass and waste plants, among others. Co. designs, develops, manages and operates power plants. Co. generates electricity using renewable energy sources mostly wind energy. Co. owns EDP Renewables Europe that operates in several European countries and Horizon Wind Energy, which operates in the United States. Co. is a part of the Energias de Portugal group.

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.

Enagas is a gas transportation company based in Spain. Co. is engaged in the technical distribution and storage of gas through pipelines as well as the provision of regasification services. Co. and subsidiaries are engaged in the ownership, administration, storage, pipeline transportation, distribution flow, and sale of natural gas. As a transport company, Co. also provides gas and manages the gas infrastructures.

Endesa is engaged in the production, transmission, distribution, and supply of electricity, through hydroelectric, fossil fuel, and nuclear generation. Co. is also engaged in the mining of coal for use in its fossil-fuel electric plants; mining research; land restoration, and environmental monitoring and control.

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.

Gas Natural SDG is a gas company based in Spain. Co. and its subsidiaries are primarily engaged in the supply, transportation, distribution and commercialization of piped natural gas, as well as the activities involving exploration and developing, supply, regasification, liquefaction and storage of natural gas, and the generation and commercialization of electricity. Co. operates mainly in Spain and also outside of Spain, especially in Latin America, Puerto Rico, Italy, France and Africa (through Maghreb-Europe gas pipeline and integrated LNG projects in Algeria).

Ren Redes Energeticas Nacionais is engaged in two principal lines of business: electricity transmission, where Co. owns and operates Portugal's national high-voltage electricity transmission network (the "RNT"), and natural gas, where Co. is engaged in the reception, storage and regasification of liquefied natural gas ("LNG"), the operation of the national high-pressure gas transmission network, which Co. owns and operates under respective concessions and the underground storage of natural gas. Co.'s electricity transmission business is conducted through its subsidiary REN - Rede Electrica, which holds a 50 year concession to operate the electricity transmission network in Portugal.

Saeta Yield SA is a Spain-based company engaged in the utility industry. The Company specializes in the production of energy from renewable sources. Its business activities are divided into two segments: Solar thermal plants and Wind farms. The Solar thermal plants segment comprises solar energy generation installations in Spain. The Wind farms sector is responsible for the operation of a range of wind farms located in various countries, including Spain, Uruguay and Portugal. It cooperates with Actividades de Construccion y Servicios SA (ACS). Furthermore, the Company is a parent of a number of entities, such as Extresol 1 SL, Al-Andalus Wind Power SL, Parque Eolico Valcaire SL, which are active within the energy production sector.