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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint744,173 companies indexed · Last updated: today
DirectoryEnergy & Environment

Energy & Environment

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IndustryEnergy & Environment
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9'016 companies found

Grünspecht GmbH Logo

Grünspecht GmbH 

Birsfelden · Since 2014

The core activity of Grünspecht GmbH encompasses the implementation of practical work in nature reserve maintenance, near-natural green space maintenance, and near-natural gardening. This includes specific maintenance work in nature reserves, such as controlling invasive neophytes, removing problem plants, clearing valuable biotopes, and selective mowing of meadows and edges. Furthermore, the company offers its own nature conservation projects and enables people with difficult market conditions to achieve social and professional integration through meaningful work assignments in nature.

Sustainability Sector
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Guggenheim Solutions GmbH Logo

Guggenheim Solutions GmbH 

Cham · Since 2015

The core activity of Guggenheim Solutions is the planning, implementation and maintenance of photovoltaic projects, including portfolio analysis, obtaining permits, applying for subsidies, construction and installation of solar systems, as well as taking over energy sales and power management. The company offers its customers a 'worry-free' package that covers all necessary steps for the realization of a photovoltaic project.

Solar & Photovoltaics
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Guido Sigrist AG Logo

Guido Sigrist AG 

Regensdorf · Since 2012

The core activity of Guido Sigrist AG is the installation, maintenance and repair of solar systems and photovoltaic systems, as well as the performance of service work in the heating and sanitary sector.

Solar & Photovoltaics
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H2 Solar AG Logo

H2 Solar AG 

Linthal · Since 2020

The core activity of H2 Solar AG is the development of technologies for artificial photosynthesis, in particular through the development of membranes that can split water into hydrogen and oxygen, thereby creating a sustainable and clean energy source.

Research & DevelopmentSolar & Photovoltaics
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Häfeli Altmetalle + Entsorgungen Logo

Häfeli Altmetalle + Entsorgungen 

Wil Sg · Since 2018

The company provides services in the field of recycling and disposal of old metals, wood, plastics, cardboard, waste and combustible materials. The core activities include collection, sorting, recycling and environmentally friendly disposal of these materials. The company also provides containers such as boxes, drums and frames to facilitate the collection and storage of old metals.

Waste Management Industry
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Halter Biotreibstoffe GmbH Logo

Halter Biotreibstoffe GmbH 

Thalwil · Since 1998

Halter Biotreibstoffe GmbH produces biodiesel (UCOME) from used vegetable oils and grease trap fats and supplies it, for example, in 1,000‑litre IBC containers. The company collects waste cooking oil from restaurants and public collection points and also handles kitchen and food waste, part of which is processed in a biogas plant to generate electricity.

Waste Management IndustryLogistics & Transport Companies
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Hampi Stocker GmbH Logo

Hampi Stocker GmbH 

Lucerne · Since 2019

The core activity of Hampi Stocker GmbH is the execution of dismantling work, clearances and disposals.

Waste Management Industry
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Harnisch S.A. Logo

Harnisch S.A. 

Sonceboz-Sombeval · Since 2001

Solar & Photovoltaics
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helcoplan GmbH Logo

helcoplan GmbH 

Basel · Since 2022

Technical Consulting & EngineeringSustainability Sector
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Helvetia Trust AG Logo

Helvetia Trust AG 

Wetzikon Zh · Since 2007

The company's core activity is the development, design, production and marketing of combined heat and power units (CHP) as well as the installation and investment in energy-efficient energy generation concepts for customers. The company also provides consulting services and engineering services in the field of combined heat and power (CHP).

Energy SuppliersFunds & Investment Companies
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H.E. Privé AG Logo

H.E. Privé AG 

Amriswil · Since 2020

The core activity of HE Privé AG is the investment, development and management of solar power plants and solar parks to produce and sell renewable energy. The company also offers services such as leasing, maintenance and repair of solar power plants. Furthermore, it enables private investors to invest in solar energy and benefit from the returns without having to bear the entire financial burden of purchasing and installing solar panels.

Solar & Photovoltaics
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Hermann Schwyzer AG Logo

Hermann Schwyzer AG 

Stans · Since 1980

The core activity of Schwyzer Heizungen AG is the planning, installation, maintenance and repair of heating systems, including environmentally friendly heating systems such as heat pumps, solar systems, wood heating systems, oil heating systems and pellet heating systems. The company also offers service activities such as burner service, corrosion protection and ventilation systems.

Solar & Photovoltaics
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HFS Aqua AG Logo

HFS Aqua AG 

Winterthur · Since 2004

The core activity of HFS Aqua AG is the development and implementation of individual solutions for drinking water and wastewater treatment. The company offers comprehensive services, including planning, sales, execution, service and development, as well as design and realization of projects.

Waste Management Industry
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HIBO Group AG Logo

HIBO Group AG 

Fehraltorf · Since 2011

The core activity of HIBO Group AG is the development and implementation of projects in the field of renewable energy, recycling and ecological construction, particularly through the production and marketing of environmentally friendly fuels, such as briquettes made from agricultural waste, with the goal of sustainably improving living conditions in Ghana and West Africa.

Management ConsultingWaste Management IndustryWholesale - Spare Parts & Residual Materials
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HK Partners AG Logo

HK Partners AG 

Bremgarten B. Bern · Since 2020

The core activity of HK PARTNERS is to advise and support companies and organizations in the development and implementation of sustainability strategies, particularly in the packaging industry and climate protection. The company offers services such as strategy development, project management, stakeholder management, and solution development for specific sustainability challenges. The goal is to help companies improve their sustainability, reduce their environmental impact, and simultaneously increase their competitiveness and long-term success.

Sustainability Sector
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Holz-Energie Wiedlisbach AG Logo

Holz-Energie Wiedlisbach AG 

Wiedlisbach · Since 2015

Energy Suppliers
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HopSol AG Logo

HopSol AG 

Wilen B. Wollerau · Since 2010

The core activity of HOPSOL Africa is the development, construction and operation of solar power plants, including on- and off-grid solar systems, fuel-saving regulators and solar-diesel hybrid systems on a large technical scale, particularly for use in desert and desert-like regions.

Solar & Photovoltaics
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WELES GROUP (Switzerland) AG Logo

WELES GROUP (Switzerland) AG 

Baar · Since 2020

The core activity of Hunter and Fry is advising and supporting companies in migrating and operating SAP systems on hyperscalable cloud platforms, in particular on the platforms of Amazon Web Services (AWS), Microsoft, Google and other global technology leaders.

Technical Consulting & EngineeringSolar & PhotovoltaicsSoftware Development
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Hydrospider AG Logo

Hydrospider AG 

Niedergösgen · Since 2019

The core activity of Hydrospider AG is the procurement, production and logistics of green hydrogen from CO2-free production, particularly for use in the mobility and logistics sectors, as well as the marketing and distribution of verifiably green hydrogen for the decarbonization of heavy-duty transport.

Energy SuppliersEnergy Industry
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Hydroswiss SA Logo

Hydroswiss SA 

Silvaplana · Since 2011

The core activity of Hydroswiss SA is the development and implementation of solutions for water treatment and purification, including: wastewater treatment (Waste Water), drinking water treatment (Drink Water), desalination (Desalination), industrial water treatment (Industrial Water), treatment of process water in the paper industry (Paper Mills Process), leachate treatment (Leachate Treatment), fishery water treatment (Fishery Water), electrodialysis (Electrodialysis), and sanitary water treatment (Sanitized Water). The company also offers solutions for energy generation from waste and biomass, including: bio-oil production (Bio-oil), energy generation from waste (Waste To Energy), and energy generation from biomass (Sludge To Energy). Furthermore, Hydroswiss SA also offers solutions for wastewater treatment and energy generation from LNG (Liquefied Natural Gas).

Waste Management IndustryMechanical Engineering Industry
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Frequently asked questions

Searching the directory

How the search works, what each filter means, and how the results come together.

What can I search for in the directory?
The search field matches company names, industries and places. Beyond that you can filter by Industry (18 categories based on the NOGA classification), Size (number of employees), Region (canton, language region or postal code) and Special (keywords and entry date). Filters combine freely; the active ones appear as chips below the filter bar and can be removed there individually.
How do keywords work?
Keywords search the description and stated purpose of each company — the text that goes beyond the company name. Multiple keywords are combined with OR: every additional keyword widens the set of matches rather than narrowing it.
What belongs in the postal code field?
A single postal code (e.g. 8000) or a range (e.g. 1000-1010). The field accepts postal codes only — for place names, use Canton or Language region.
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How is organisation size determined?
Size reflects the number of employees and is calculated from publicly available information by a model developed in-house. It is a best-possible estimate, not an official figure.
What does the Verified label mean?
Verified means the entry is tied to a UID (Swiss business identification number) and therefore links back to the official Swiss business register. The label speaks to the company's identity — it is not a rating of its performance.

Source: Federal Statistical Office, UID register

How do I sort the results?
Use the dropdown above the list: Relevance, Name (A–Z), Best rating, Most reviews or Longest established. You can also switch between list and map view and set how many results appear per page.