The transaction is subject to regulatory approvals in Mexico and the US.
According to InterGen, the $300m first phase of the EnergÃa Sierra Juarez project consists of 47 turbines of 3.3MW capacity each.
San Diego Gas & Electric has already signed a 20-year power purchase agreement for the project that would become operational during the first half of 2015.
The EnergÃa Sierra Juarez project is said to be the first cross-border wind-generation project between Mexico and the US.
InterGen president and CEO Neil H. Smith said "The company is pleased to be working with IEnova on its first renewables’ generation project. InterGen is committed to growing its business in Mexico and we view IEnova as an ideal strategic partner as they bring many complementary skills in the development, construction and operation of energy infrastructure in Mexico."
