ACS Actividades de Construccion y Servicios is a holding company. Through its subsidiaries, Co.'s activities are divided into the following areas: Construction, engaged in the construction of civil works, and residential and non-residential building construction; industrial services, engaged in the development of applied engineering services, installations and the maintenance of industrial infrastructures in the energy, communications and control systems sectors; services, groups together environmental services, the outsourcing of building maintenance services, logistics and transport services; and concessions, mainly engaged in transport infrastructure concessions.

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.

Fomento de Construcciones y Contratas is the parent company of a group engaged in sanitation services, cleaning, maintaining, purification and distribution of water, construction of highways, hydraulic works, marine works, air and rail transport infrastructure, urban developments, housing, non-residential buildings, office buildings, toll highways, parking garages, marinas and water treatment plants. Co. is also engaged in the manufacture and sale of cement and cement infrastructures, such as precast concrete elements; and in the financial markets, and real estate development, leasing and tourism.

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.