Toachi - Pilatón Hydroelectric Project

Definitive design

«It will directly benefit Ecuador's energy matrix with green energy, reducing the use of thermoelectric power plants.»
The Toachi-Pilatón hydroelectric plant, located in the provinces of Pichincha, Cotopaxi and Santo Domingo de los Tsáchilas in Ecuador, harnesses the waters of the Toachi and Pilatón rivers to generate renewable and sustainable energy.

Located just 80 km from Quito, near the Quito-Santo Domingo de los Colorados highway, the Toachi Pilatón Hydroelectric Project extends through the provinces of Pichincha, Santo Domingo de los Tsáchilas and Cotopaxi. This project, which is being developed in the cantons of Mejía, Santo Domingo and Sigchos, as well as in several surrounding parishes, represents a milestone in renewable energy generation in Ecuador.

The project consists of two main cascading components: Pilatón-Sarapullo and Toachi-Alluriquín. The Sarapullo development includes a catchment on the Pilatón River, a pressure loading tunnel, an upper balancing stack, a Sarapullo subway powerhouse equipped with three Francis turbines totaling 48 MW, and an efficient discharge system. On the other hand, the Alluriquín development has a concrete gravity dam, a reservoir with regulation capacity, a 9.2 km loading tunnel, an upper balancing stack, and a subway powerhouse near Alluriquín with turbines totaling 198 MW of installed capacity.

Both components of the project are designed to optimize the use of water resources and generate energy efficiently, connecting to the National Interconnected System to distribute the energy produced. This project is crucial for Ecuador's energy development since it is located on the Pacific slope and will contribute to generating energy in the most demanding period of the market.

  • Hydroelectric power plants
  • Surface and underground powerhouses
  • Hydraulic tunnels and shafts
  • Penstocks and steel lining
  • Hydromechanical equipment
  • Electromechanical equipment
  • Balance of Plant
  • Dams and retention structures
  • Hydrology and watershed modelling
  • Monitoring

Concrete gravity dam

60 m

Dam height

15+ km

Length of conduction tunnels


MW power plant

Lat: -0.367935
Lng: -78.915468

Santo Domingo, Ecuador