Elecnor, S.A. engages in the development, construction, and operation of projects and services in Spain and internationally. It operates through three segments: Services, Projects, and Concessions and Own Projects. The company offers electricity distribution, telecommunications, and infrastructure maintenance; construction, operation, and maintenance of energy generation and transmission infrastructure; and promotion, financing, investment, and management of energy transmission and generation assets. It also provides electricity, power generation, maintenance, efficiency energy, telecommunications and systems, railways, gas, facilities, construction, water, environment, and natural resource activities. In addition, the company offers distribution and transmission networks, substations, transformer stations, and live-line work; public lighting; wind farms, solar photovoltaics, power generation plants, and self-consumption; catenary, traction substations, signaling, and interlocking, and communications; construction and rehabilitation of non-residential buildings; electricity and instrumentation, air conditioning, fire protection, ventilation, automation and control, plumbing and sanitation, security, public address and sound, and comprehensive installations; hydraulic works, water treatment plants, and environmental works. Elecnor, S.A. was incorporated in 1958 and is based in Madrid, Spain. Elecnor, S.A. operates as a subsidiary of Cantiles XXI, S.L.