In 1945, after an intensive investigation, Antunez de Mayolo introduced the study for hydroelectric exploitation called first curve of the Mantaro River in the province of Tayacaja, Huancavelica. Between 1954 and 1961, several preliminary studies by consultants from the US, Japan and West Germany were made. Those confirmed the approach of Antunez de Mayolo.
Thus, in December 1961 was created The Electric Corporation Energy Mantaro (CORMAN), a public company responsible for developing and exploit the hydroelectric potential of the Mantaro River.The Corporation began operating in 1963, making a comparative study of the proposals from several international companies. As a result, it was decided to start formal negotiations with the GIE Impregilo Group from Italy, which took place between March and June 1966.
The Servicing Agreement of procurement, construction and financing of the Mantaro Project was signed on September 1, 1966. The construction equipment started to arrive between January and June 1967, when the civil works began.
These works should begin by the task that allow make viable the complex in the area. An important aspect of these tasks were the construction of new roads that allow transporting materials and equipment. Also, the improvement of existing roads, allowing these withstand the passage of heavy equipment required. They had to build large camps in Mantacra, Villa Azul and Field Armiño, in order to accommodate the thousands of workers who labored in the work. These camps came to shelter 10,000 workers and their families