Penstock installation completed at 531-MW Alto Maipo hydropower in Chile

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ATB Riva Calzoni reports it has completed the installation of the vertical shaft penstock at the 531-MW Alto Maipo Hydropower Project in Chile.

The 2.4-m-diameter penstock is installed in a 551-m-deep shaft, named Alfalfal II, one of the deepest shafts in hydropower projects all over the world, according to a press release.

The penstock is manufactured with high tensile strength steel (S 690 QL) and has a design head of 1,280 m and a maximum wall thickness of 57 mm.

Alto Maipo, being developed by AES Gener, includes two run-of-river hydropower plants on the upper section of the Maipo River 50 km from Santiago: 264-MW Alfalfal 2 and 267-MW Las Lajas. The facilities are expected to cost US$3 billion to complete.

In 2020, AES Gener said it was planning to combine 50 MWh of energy storage with its Alto Maipo hydropower plant to create a first-of-its-kind virtual reservoir. However, specific details on this plan were not provided.


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