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.

Companies

All 49 companies in the Canton of St. Gallen

Zwicker Präzisionsmechanik AG Logo

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.

Electrical IndustryCNC machiningCNC millingCNC turning
ranQ Trust Score 4.5 out of 5.0, rated Excellent, Rank #1
Fortimo Solutions AG Logo

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.

Energy IndustryEnergy solutions with solar electricityContracting
ranQ Trust Score 4.4 out of 5.0, rated Very high, Rank #2
SAK onergy AG Logo

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.

Energy IndustryPhotovoltaic systemsHeat pumpsBattery storage
ranQ Trust Score 4.3 out of 5.0, rated Very high, Rank #3
Sysbo AG Logo

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.

Energy IndustryIndirect district heating transfer stationDirect district heating transfer stationHot water solutions
ranQ Trust Score 4.3 out of 5.0, rated Very high, Rank #4
Heller AG Kälte-Energie-Technik Logo

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.

Energy IndustryCommercial refrigerationIndustrial refrigerationVehicle cooling
ranQ Trust Score 4.3 out of 5.0, rated Very high, Rank #5
HSK AG Kälte-, Klima- und Energietechnik Logo

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.

Energy IndustryRefrigeration technologyServiceProducts
ranQ Trust Score 4.2 out of 5.0, rated Very high, Rank #6
Arnold AG Logo

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.

Energy IndustryGrid construction in the energy sectorTelecom network constructionGrid construction in the transport sector
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #7
Bion Bauhaus AG Logo

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.

Plumbing & Building ServicesHeat pumpsWood energySolar systems
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #8
Entegra Wasserkraft AG Logo

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.

Energy IndustryPlanning and construction of hydropower plantsRenovation of hydropower plants under the Water Protection ActBusiness and operations management
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #9
Glattstrom Buchholz AG Logo

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.

Energy IndustryManagement and operations management mandate for the small hydropower plant Buchholz
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #10
NRG A AG Logo

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.

Energy IndustryDistrict heatingHeat and energy contractingWaste heat utilization
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #11
NRG B AG Logo

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.

Energy IndustryDistrict heatingSolar energyHeat and energy contracting
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #12
Kraftwerk Stadtbrücke AG Logo

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.

Energy IndustryElectricity generation
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #13
SN Erneuerbare Energie AG Logo

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.

Solar & PhotovoltaicsElectricity market monitorElectricity portfolio managementHKN portfolio management
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #14
Ventus Energy GmbH Logo

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.

Energy IndustryRenewable energy project developmentProject finance for energy infrastructureDirect loans to energy projects
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #15
Bilfit Windkraft AG Logo

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.

Energy IndustryLeak detectionDryingDisinfection
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #16
Wasserstoffproduktion Ostschweiz AG Logo

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.

Energy SuppliersHydrogen productionHydrogen fueling stationsTours of hydrogen production
ranQ Trust Score 4.1 out of 5.0, rated High, Rank #17
Troyer Suisse AG Logo

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.

Technical Consulting & EngineeringComplete solutionsTurbinesControl & automation
ranQ Trust Score 4.0 out of 5.0, rated High, Rank #18
green2energy AG Logo

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.

Energy IndustryBiogas Plant and Biomass RecoverySustainable Energy Supply
ranQ Trust Score 4.0 out of 5.0, rated High, Rank #19
Enertrans GmbH Logo

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.

Energy IndustryGrid facilitiesLinesAsset Management
ranQ Trust Score 4.0 out of 5.0, rated High, Rank #20
ELCOTHERM AG Logo

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.

Energy IndustryHeat pumpsGas heating systemsOil heating systems
ranQ Trust Score 3.9 out of 5.0, rated High, Rank #21
ETS Energie-Technik-Systeme AG Logo

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.

Energy IndustryHeat exchangersSterile heat exchangersShell-and-tube heat exchangers
ranQ Trust Score 3.9 out of 5.0, rated High, Rank #22
Buschor Fernwärme AG Logo

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.

Energy Industry
ranQ Trust Score 3.8 out of 5.0, rated High, Rank #23
separatus AG Logo

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.

Energy IndustryGeothermal heating and cooling systemGeothermal system planningPartner matching for geothermal projects
ranQ Trust Score 3.8 out of 5.0, rated High, Rank #24
WE

Wasserkraftwerk Ebnat AG

Since 2003 · 1–10 empl.5.0(1)

Energy Industry
ranQ Trust Score 3.8 out of 5.0, rated High, Rank #25
iNET ENERGETIX AG Logo

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.

Energy IndustrySolar energy projectsTechnical services for solar projectsFinancial services for solar projects
No score yet
Natpower International AG Logo

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.

Energy IndustryHydro Electricity StorageAdvanced Renewable Energy System (ARES)Project Development, Financing, Implementation and Operation
No score yet
Kraftwerke Unterterzen AG Logo

Kraftwerke Unterterzen AG

Since 1988 · 1–10 empl.

Energy Industry
No score yet
CC

CNO Consulting SA

Since 1990 · 1–10 empl.

Energy Industry
No score yet
GC

Genossenschaft Calandablick-Unterrain Bad Ragaz

Since 1990 · 1–10 empl.

Energy Industry
No score yet
IW

Isento Wasserkraft AG

Since 1990 · 1–10 empl.

Energy Industry
No score yet
EG

ERUN GmbH

Since 1996 · 1–10 empl.

Energy Industry
No score yet
PE

Poltera Energie und Automation

Since 1996 · 1–10 empl.

Energy Industry
No score yet
KM

Kleinwasserkraftwerk Mühle AG

Since 2000 · 1–10 empl.

Energy Industry
No score yet
BK

BSW Kraftwerk AG

Since 2002 · 1–10 empl.

Energy Industry
No score yet
WE

Watt Energie GmbH

Since 2008 · 1–10 empl.

Energy Industry
No score yet
GF

Genossenschaft Fernwärme Mogelsberg

Since 2010 · 1–10 empl.

Energy Industry
No score yet
VV

Vento Verde AG

Since 2011 · 1–10 empl.

Energy Industry
No score yet
FA

FAARLAND AG

Since 2012 · 1–10 empl.

Research & Development
No score yet
KB

Kraftwerk Berschnerbach AG

Since 2013 · 1–10 empl.

Energy Industry
No score yet
AA

Aklas AG

Since 2014 · 1–10 empl.

Energy Industry
No score yet
TE

Tommasini Energie

Since 2019 · 1–10 empl.

Energy Industry
No score yet
SA

SNL AG

Since 2021 · 1–10 empl.

Energy Suppliers
No score yet
NG

N2E GmbH

Since 2023 · 1–10 empl.

Energy Industry
No score yet
BG

BK-Sunray GmbH

Since 2023 · 1–10 empl.

Energy Industry
No score yet
SP

SYNTEC POWERFUELS AG

Since 2023 · 1–10 empl.

Research & Development
No score yet
WG

WOC GROUP AG

Since 2024 · 1–10 empl.

Technical Consulting & Engineering
No score yet
WN

Wärme Netz Ostschweiz Holding AG

Since 2024 · 1–10 empl.

Energy Industry
No score yet
AK

Andreas Kamer

Since 2025 · 1–10 empl.

Energy Industry
No score yet

Energy Industry in the Canton of St. Gallen

49Energy IndustryCommercial register (Zefix) · as of October 11, 2026
2011Median year of registrationCommercial register (Zefix) · as of October 11, 2026
49in the Canton of St. GallenCommercial register (Zefix) · as of October 11, 2026
1,492in SwitzerlandCommercial register (Zefix) · as of October 11, 2026
Locations

Energy Industry in the region

Point size by number of companies per place.

Source: commercial register (Zefix) · as of October 11, 2026

Largest places

St. Gallen11