Energy Industry in the
Canton of St. Gallen
49 companies in Energy Industry based in the Canton of St. Gallen — name and year of registration from the commercial register. The list below shows them all.
All 49 companies in the Canton of St. Gallen

Zwicker Präzisionsmechanik AG
Since 1994 · 21–50 empl.4.5(10)
The core activity of Zwicker Präzisionsmechanik AG is CNC manufacturing of highly precise machine and apparatus parts as well as mold making, in particular in the field of microwave and vacuum technology, machine and apparatus construction, and aerospace. This includes, in particular, CNC turning, CNC milling, toolmaking and EDM.
Fortimo Solutions AG
Since 2019 · 21–50 empl.4.2(102)
Fortimo Solutions AG develops, owns and operates real estate with a focus on residential properties and hospitality. The company delivers rental and owner‑occupied apartments, develops tourism projects (Revier hotels and Privà lodges) and provides investment, portfolio holding and property management across the full value chain.
SAK onergy AG
Since 2022 · 21–50 empl.5.0(24)
SAK Energiesysteme AG provides planning, supply, installation and maintenance of photovoltaic systems, battery storage, charging stations and heat pumps. Services include consulting, system design, permit handling and commissioning of renewable energy systems.
Sysbo AG
Since 2015 · 21–50 empl.4.9(14)
Sysbo AG develops and manufactures district heating technologies and provides products and services including district heating transfer stations, hot water modules, control and visualization systems, as well as network monitoring and leak detection. The company also carries out refurbishment and optimization during operation, plant engineering and planning support for heat networks.
Heller AG Kälte-Energie-Technik
Since 1993 · 11–20 empl.4.4(14)
The company's core activity is the development, manufacture and provision of products and services in the field of refrigeration energy technology.
HSK AG Kälte-, Klima- und Energietechnik
Since 2001 · 11–20 empl.4.4(9)
The core activity of HSK AG is the development, manufacture and installation of refrigeration, air conditioning and energy technology solutions for various industries, particularly for the food industry (bakeries, butchers, cheese factories, gastronomy, shopfitting). The company offers customized solutions for the cold chain, air conditioning and energy efficiency, and also provides services such as maintenance, optimization and repair services.
Arnold AG
Since 2015 · 51–100 empl.4.3(12)
Arnold AG is part of the Infra Services group within BKW and provides network construction services in the areas of energy, telecom, transport, and water. The company delivers comprehensive end-to-end network services across Switzerland.
Bion Bauhaus AG
Since 1994 · 11–20 empl.
Bion Bauhaus AG is Heim AG Heizsysteme. Heim AG Heizsysteme acquired Bion Bauhaus AG on 1 July 2023 and handles enquiries and services through its heating-systems business, which provides renewable-energy heating solutions such as heat pumps, wood-energy systems, solar systems and energy-management solutions.
Entegra Wasserkraft AG
Since 1999 · 11–20 empl.
The core activity of Entegra Wasserkraft AG is the planning, implementation (new construction and renovation) and operation of hydroelectric power plants, particularly in the field of small-scale hydroelectric power. This encompasses three main areas: 1. Planning and construction of hydroelectric power plants, 2. Commercial and operational management of hydroelectric power plants, and 3. Renovation of hydroelectric power plants in accordance with the Water Protection Act (GSchG). The company is also active in decentralized production of renewable energy and operates its own power plants.
Glattstrom Buchholz AG
Since 2004 · 1–10 empl.
Glattstrom Buchholz AG is a company active in hydropower. It plans, builds and operates hydropower plants, manages its own small hydropower plants, and provides operations management and rehabilitation projects under water protection legislation.
NRG A AG
Since 2006 · 21–50 empl.
The core activity of NRG Holding AG is the generation and supply of climate-friendly, CO2-neutral district heating, in particular through the construction and operation of energy generation plants, such as heat networks, solar energy systems and wood-fired power plants, as well as the utilization of waste heat and contracting.
NRG B AG
Since 2007 · 21–50 empl.
NRG B AG is an energy company that produces district heating and provides energy services including solar energy, heat contracting, waste heat utilization, wood intake and electricity supply, as well as construction and maintenance of energy installations.
Kraftwerk Stadtbrücke AG
Since 2011 · 11–20 empl.
Kraftwerk Stadtbrücke AG operates a power plant and provides information on its history, company details and contact information on its website. The site also refers to the new construction of the power plant and the production of electricity at this location.
SN Erneuerbare Energie AG
Since 2012 · 11–20 empl.
The core activity of SN Energie AG is the production, trading and distribution of electricity, including the supply of energy supply companies (EVU) and traders with electricity and heat power network (HKN). This also includes services such as portfolio optimization, asset and participation management, as well as the provision of solutions for balancing energy, quantity tolerance and the documentation of the ecological footprint.
Ventus Energy GmbH
Since 2012 · 11–20 empl.
The company is primarily active in the development and financing of renewable energy projects, particularly in the areas of solar, wind and biomass energy. It provides services to landowners and investors to support the development of sustainable energy projects and enable long-term returns.
Bilfit Windkraft AG
Since 2015 · 1–10 empl.
Bilfit Windkraft AG provides services in leak detection, thermography, water-damage drying and remediation coordination. Listed services include flat-roof and pool leak detection, water-loss analyses for suppliers, pipe disinfection and pressure testing, plus drying and decontamination work.
Wasserstoffproduktion Ostschweiz AG
Since 2019 · 51–100 empl.
The core activity of Wasserstoffproduktion Ostschweiz AG is the production of hydrogen as a future energy carrier for mobility, particularly for the operation of hydrogen-powered vehicles. The company makes the produced hydrogen available at AVIA hydrogen filling stations to offer a sustainable alternative to fossil fuels.
Troyer Suisse AG
Since 2012 · 51–100 empl.5.0(1)
The core activity of Troyer AG is the planning, development, manufacture, assembly and commissioning of high-quality water turbines and power plant systems for energy generation from hydropower as well as local energy distribution. This also includes the provision of complete solutions, turbines, ball valves, visualization and remote control systems, control & automation, network control technology, renewal and optimization as well as service & maintenance.
green2energy AG
Since 2021 · 11–20 empl.
The core activity of green2energy is the production of renewable energy through the utilization of biowaste in a dry fermentation plant, where the resulting biogas is fed into the local gas grid.
Enertrans GmbH
Since 2021 · 1–10 empl.
Enertrans GmbH plans, builds and operates high- and medium-voltage installations and provides engineering services for grid operators, utilities, power plants and industrial clients. Its services include line planning and construction, design and commissioning of switchgear and substations, asset management, network analyses, technical documentation and network-related digitalisation services.
ELCOTHERM AG
Since 1996 · 51–100 empl.2.4(11)
The core activity of ELCO is the development, manufacture and marketing of heating solutions, particularly heat pumps, gas heating systems and other energy-optimised heating systems for the residential, commercial and industrial sectors.
ETS Energie-Technik-Systeme AG
Since 1991 · 21–50 empl.4.0(1)
The core activity of ETS AG is the manufacture of heat exchangers and heating/cooling devices, particularly for heat transfer between liquids and gases using various principles.
Buschor Fernwärme AG
Since 2013 · 1–10 empl.5.0(1)
Buschor Fernwärme AG operates a central heat production plant and supplies heat via a pipeline network for space heating and domestic hot water. It supplies customers in the municipality with district heating and lists simple operation, minimal maintenance, low noise and cost-effective, sustainable service as advantages.
separatus AG
Since 2023 · 11–20 empl.5.0(1)
The core activity of separatus AG is the development, manufacture and marketing of geothermal systems, in particular patented splitpipe technologies, which offer an efficient, noise-free and cost-effective solution for heating and cooling.
Wasserkraftwerk Ebnat AG
Since 2003 · 1–10 empl.5.0(1)
iNET ENERGETIX AG
Since 1983 · 11–20 empl.
The core activity of iNet Global Wil, Switzerland, is providing services in the field of renewable energy, particularly in the solar industry. The company offers financial and technical services to support companies and investors in the development and implementation of solar projects.
Natpower International AG
Since 2013 · 11–20 empl.
The core activity of NATPOWER International AG is the development and provision of intelligent energy and renewable energy solutions, particularly in the area of Smart Energy and green gains. The company offers a comprehensive system called ARES (Advanced Renewable Energy System), which aims to reduce energy costs, increase business resilience and protect the environment at the same time.
Kraftwerke Unterterzen AG
Since 1988 · 1–10 empl.
CNO Consulting SA
Since 1990 · 1–10 empl.
Genossenschaft Calandablick-Unterrain Bad Ragaz
Since 1990 · 1–10 empl.
Isento Wasserkraft AG
Since 1990 · 1–10 empl.
ERUN GmbH
Since 1996 · 1–10 empl.
Poltera Energie und Automation
Since 1996 · 1–10 empl.
Kleinwasserkraftwerk Mühle AG
Since 2000 · 1–10 empl.
BSW Kraftwerk AG
Since 2002 · 1–10 empl.
Watt Energie GmbH
Since 2008 · 1–10 empl.
Genossenschaft Fernwärme Mogelsberg
Since 2010 · 1–10 empl.
Vento Verde AG
Since 2011 · 1–10 empl.
FAARLAND AG
Since 2012 · 1–10 empl.
Kraftwerk Berschnerbach AG
Since 2013 · 1–10 empl.
Aklas AG
Since 2014 · 1–10 empl.
Tommasini Energie
Since 2019 · 1–10 empl.
SNL AG
Since 2021 · 1–10 empl.
N2E GmbH
Since 2023 · 1–10 empl.
BK-Sunray GmbH
Since 2023 · 1–10 empl.
SYNTEC POWERFUELS AG
Since 2023 · 1–10 empl.
WOC GROUP AG
Since 2024 · 1–10 empl.
Wärme Netz Ostschweiz Holding AG
Since 2024 · 1–10 empl.
Andreas Kamer
Since 2025 · 1–10 empl.
Energy Industry in the Canton of St. Gallen
Energy Industry in the region
Point size by number of companies per place.
Source: commercial register (Zefix) · as of October 11, 2026
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