Iberdrola Ingeniería y Construcción has been awarded a $16.3m (£11.2m) contract to build a substation and a 10.9km underground transmission line in the Mexican state of Sonora.
The turnkey project, awarded by the Mexican Federal Electricity Commission, is scheduled for completion within a year.
The voltage of the underground line is 115kV and the 115/13.8kV associated substation has a capacity of 30MVA. The site will have two high-voltage feeders, six medium-voltage feeders and 5.7km of trunk lines.
Iberdrola Ingeniería has already built around 40 electricity substations in the country with an installed capacity of some 2,000MVA, as well as more than 50 transmission lines covering in excess of 1,615km.
Also in Mexico, the company has built the largest combined-cycle power plant in Tamazunchale, with an installed capacity of 1.15MW. It has also built the La Venta II wind farm and the La Ventosa facility for Iberdrola Renovables.