Energy producer in
Sion

Grande Dixence SA

Since 1950 · 101–500 empl.·4.8(25)

Grande Dixence SA operates hydroelectric facilities for storing water and generating electricity. Its reservoirs and power plants produce peak and balancing power according to demand, and all the electricity generated is supplied to four partner companies.

FMV SA

Since 1991 · 21–50 empl.·5.0(1)

FMV SA generates electricity, mainly from hydropower, and develops projects in alpine solar power and other renewable energies. It manages and markets electricity and operates the high-voltage grid on behalf of Valgrid.

HYDRO Exploitation SA

Since 2002 · 21–50 empl.

HYDRO Exploitation SA operates, maintains and monitors hydroelectric facilities. Its services also include engineering from feasibility studies through commissioning, automation and information systems, inspections, and mechanical rehabilitation of plant components.

Valgrid SA

Since 2005 · 11–20 empl.

Valgrid SA owns a supraregional 65 kV electricity network. It works to improve the network’s efficiency and operation and to ensure security of electricity supply across the canton; FMV is mandated to manage its technical and administrative activities.

Forces Motrices de Mauvoisin SA

Since 1947 · 11–20 empl.

Forces Motrices de Mauvoisin SA generates hydroelectricity and operates and maintains hydropower facilities and energy networks. Its installations include the Chanrion, Fionnay, Champsec and Riddes plants.

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 the building, infrastructure and energy sectors. Its services include consulting and planning across the project life cycle, including structural and geotechnical engineering, infrastructure and energy systems, and environmental and safety engineering.

Sogaval SA

Since 1931 · 11–20 empl.

GDL Consulting Sàrl

Since 2026 · 1–10 empl.