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Iberdrola chooses Voith to modernize pump-turbines at Torrejon, Valdecanas projects

Voith and Spanish electricity generation company Iberdrola recently signed a contract to modernize five pump turbines for the 132-MW Torrejón and 249-MW Valdecañas hydroelectric plants on the Tajo River.

Voith says the contract negotiations were conducted online from the home office by both parties, due to travel restrictions caused by the COVID-19 pandemic.

For the Torrejón hydropower plant, Voith will supply two 43-MW semi-axial pump-turbines. The scope of supply includes the runners, guide vanes, turbine covers, shafts and bearings, as well as hydraulic and digital governors. As part of the modernization, the plant will be converted to variable-speed operation and the head will be increased.

For the Valdecañas hydropower plant, Voith will supply three 83-MW Deriaz pump-turbines. The scope of supply for this project includes the runners, parts of the control systems and the hydraulic governors.

In addition, both projects include model acceptance tests, installation supervision and full commissioning of the turbines.

“By modernizing both hydropower plants, Voith is making an important contribution to a more flexible use of hydropower plants in the European power grid,” explains Quentin Seringe, sales and marketing manager at Voith Hydro. “For the Valdecañas project, we are developing a Deriaz pump turbine that can be optimally used especially for small to medium heads. The Torrejón project also represents a special modernization project for Voith due to the speed variability and the increase in head while maintaining the same construction conditions,” adds Seringe.

Acceptance of the model tests is expected in mid-2021. The first runners for the plants are to be delivered in the second half of 2022 and the last runners in mid-2024. Commissioning of the plants is scheduled for early 2025.

Iberdrola is one of the world’s biggest electricity utilities. Iberdrola has a total installed generating capacity of 52,084 MW, in Spain (26,627 MW), Mexico (9,532 MW), the U.S. (8,361 MW), Brazil (4,079 MW), the UK (2,520 MW) and other European countries (965 MW). The company’s renewable technologies include offshore and onshore wind, hydroelectric power, solar photovoltaic and combined cycle.

The partnership between Voith Hydro and Ibderdrola dates back several decades, Voith says, and includes work on the Gabriel y Galan, La Muela II, San Esteban and Conso hydropower plants.