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November 29, 2021

Santiago Antunez de Mayolo, Peru

By Carmen

Santiago Antunez de Mayolo is a 798MW hydro power project. It is located on Mantaro river/basin in Huancavelica, Peru. The project is currently active. It has been developed in single phase. The project construction commenced in 1967 and subsequently entered into commercial operation in 1973.

Project Type Total Capacity (MW) Active Capacity (MW) Pipeline Capacity (MW) Project Status Project Location Project Developer
Hydropower 798 798 Active Huancavelica, Peru Webuild


The project was developed by Webuild and is currently owned by Empresa Electricidad del Peru with a stake of 100%.

Santiago Antunez de Mayolo is a reservoir based project. Santiago Antunez de Mayolo underwent through rehabilitation & modernization during 1979, 2015-2017. The project generated 5,356.55 GWh of electricity.

Development Status

The project construction commenced in 1967 and subsequently entered into commercial operation in 1973.

Contractors Involved

Ansaldo San Giorgio was selected as the turbine supplier for the hydro power project. The company provided 7 units of pelton turbines, each with 114MW nameplate capacity.

The electric generators for the project were procured from Ansaldo San Giorgio and Ercole Marelli Power.

About Webuild

Webuild SpA (Webuild), formerly Salini Impregilo SpA, is a heavy construction contractor. It specializes in executing large and complex projects. The company offers design, engineering and construction services for dams, hydroelectric plants, canals, railways, metros, bridges, roads, motorways, civil and industrial buildings and airports. It also executes underground works, and civil engineering works for waste-to-energy plants and environmental protection projects. The company also carries out concessions activities related to motorways, metros and car parks. Webuild primarily serves water, renewable energy, transport and urban infrastructure sectors. It has operations in several countries across Europe, North America, Latin America, the Middle East, Africa, Asia and Oceania. Webuild is headquartered in Milan, Italy.


All power projects included in this report are drawn from GlobalData’s Power Intelligence Center. The information regarding the project parameters is sourced through secondary information sources such as electric utilities, equipment manufacturers, developers, project proponent’s – news, deals and financial reporting, regulatory body, associations, government planning reports and publications. Wherever needed the information is further validated through primary from various stakeholders across the power value chain and professionals from leading players within the power sector.

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