Swiss green power producer aventron is acquiring a significant stake in the “Sur Grati” wind farm, located in the municipalities of Premier, Vallorbe and Vaulion. The energy utility SIE SA, based in Crissier, as well as the municipalities of Premier, Vallorbe and Vaulion, will also hold stakes in the operating company VOé éole SA. This partnership is based on shared values in renewable energy generation and aims to advance Switzerland’s energy autonomy.

As planned at this stage of the project, and following the positive decision of the Federal Supreme Court in May 2025 regarding the construction permits for the wind farm, the project company VOé éole SA has formally finalised its shareholder structure and financing.

The project partners share common values and complement each other ideally. VOé has developed the project over several years and, as a local energy provider, maintains close ties with regional stakeholders. aventron, which already operates wind farms in Germany, Italy, France and Spain with a total installed capacity of around 362 megawatts, will contribute its expertise in construction and operation. Together, VOé, aventron, SIE SA and the three local municipalities form a strong, complementary and experienced shareholder group for VOé éole SA.

“With VOé, we have a regionally anchored partner by our side that has developed this project together with the municipalities over many years,” says Eric Wagner, CEO of aventron. “Together, we are delivering one of the largest wind energy projects in Switzerland. In doing so, we support the Federal Energy Strategy, strengthen security of supply, particularly in winter, and demonstrate how regional roots and international expertise can combine to make a tangible contribution to Switzerland’s renewable electricity supply.” aventron AG’s commitment is also supported by its co-owners Primeo Energie, Energie Wasser Bern and Stadtwerk Winterthur.

“With aventron, we can rely on a partner with extensive experience in the development and management of wind energy projects across Europe,” explains Thierry Zeller, Co-Director of the VOé Group. “This partnership will make a significant contribution to the success and sustainability of the ‘Sur Grati’ wind farm.”

“For SIE, which is 100% owned by four municipalities in the canton of Vaud, it is only natural to support a project for local sustainable development that has historically been driven by VOé and is now strengthened by aventron. These wind turbines complement the energy mix required for our electricity supply,” says Stéphane Rezso, member of the Board of Directors of SIE SA.

The wind farm is located on the Jura ridge in the northern part of the canton of Vaud and is currently under construction. Commissioning is planned for the end of 2027. With six wind turbines and a total installed capacity of 25.2 megawatts, “Sur Grati” will generate around 45 gigawatt-hours of renewable electricity annually, in compliance with environmental protection requirements. This corresponds to the annual consumption of approximately 11,000 households. Once completed, “Sur Grati” will be the second-largest wind farm in Switzerland.

For further information and media enquiries, please contact:

aventron AG
Eric Wagner, CEO
eric.wagner@aventron.com

VOé Holding SA
Thierry Zeller, Co-Director General
t.zeller@voe.ch