Energy Suppliers in
Sion

Grande Dixence SA

Since 1950 · 101–500 empl.·4.8(25)

The core activity of Grande Dixence SA is the production of energy from hydropower, particularly through the operation of dams, hydroelectric power plants and pumping stations in the Alps. The company specializes in the generation of energy from hydropower and focuses on sustainable and environmentally friendly electricity production.

FMV SA

Since 1991 · 21–50 empl.·5.0(1)

The company's core activity is the production, distribution and utilisation of renewable energy, particularly hydropower, photovoltaics and other renewable energies. The company operates a 100% renewable production park and aims to become the largest Swiss hydropower producer by 2050.

HYDRO Exploitation SA

Since 2002 · 21–50 empl.

HYDRO Exploitation SA provides operation and maintenance services for hydroelectric installations. Its activities include engineering studies, mechanical rehabilitation and workshop manufacturing, automation and control systems, measurement and inspection services, and other specialized maintenance support.

Valgrid SA

Since 2005 · 11–20 empl.

The core activity of Valgrid SA is the transmission of electrical energy on the supraregional high-voltage grid in the canton of Valais. The company is the owner of the 65-kV grid and has the task of improving the efficiency of the grid, simplifying its operation and controlling costs in order to guarantee the security of the power supply in the canton.

Forces Motrices de Mauvoisin SA

Since 1947 · 11–20 empl.

Alp-Hydro AG

Since 1998 · 1–10 empl.·4.7(6)

The core activity of HYDRO Exploitation SA is the planning, construction, maintenance and operation of hydroelectric power plants, including the rehabilitation and new construction of facilities, as well as the provision of services in the fields of electrical engineering, mechanics and hydraulic engineering. The company also offers engineering services, such as conducting studies, analyses and simulations, as well as the creation of projects and the operation of laboratories.

Altis Management Sàrl

Since 2026 · 101–500 empl.

Altis Management Sàrl is a company active in energy and water services, offering solutions in electricity, water, heat, mobility and building services. It develops and operates local services such as power networks, water networks, renewable heating, solar installations, e-mobility and energy audits.

Gruner Stucky AG

Since 2026 · 1–10 empl.

Gruner Stucky AG is an engineering and design company serving private and public clients in the building construction, infrastructure and energy sectors. Its services include structural design, geotechnical engineering, building services, environmental and safety engineering, infrastructure planning and digital engineering solutions.

Sogaval SA

Since 1931 · 11–20 empl.

GDL Consulting Sàrl

Since 2026 · 1–10 empl.