Electricity works Other activities to prepare the site Construction, establishment and repair of electric power plants and transformers. Electrical installations - sway Extension of electrical wires - suffix Extensions of networks - suffs Other activities from the extension of electrical wires and communications. Installation of lighting systems - illumination Installation of fire alarm systems Installation of road lighting systems Installation, maintenance and repair of refrigeration and air conditioning systems. Fire pipe extensions, maintenance . repair and traditional and renewable power generation projects for low, medium and high voltage electric power plants, power transmission and distribution projects