Callax Holding GmbH - Dedicated to energy investments for a greener planet.

About Us

  • The Callax Holding GmbH is a multi-national investment company with its focus on renewable energies. The investments and stakes are in energy-supplier organisations (electricity, gas, heat-flow in Germany & Austria) as well as in services for e-mobility and marketing of innovative energy solutions of any kind.

    Our constant endeavor is to develop every known advantage for our customer, for an easy and seaming less use of all our services.

    We are also venture capitalist, specialised on innovative energy solutions, e-mobility, services & e-commerce solutions in all segments of energy supply.

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Investments

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    Stromio GmbH

    Since 2009, Stromio is an energy provider in Germany, for private homes. We deliver reliable and cheap energy to our customer, mostly from eco-friendly energy sources.

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    gas.de Versorgungsgesellschaft mbH

    Since 2010, gas.de is a gas provider in Germany, for private homes. Our customers are only delivered with reliable and top services. Best Quality assurance is our main goal.

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    Grünwelt Energie Services GmbH

    Grünwelt Energie is a provider of green electricity and climate neutral gas in Germany. We deliver reliable and cheap energy to our customer, only from eco-friendly energy sources.

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    Grünwelt-Stiftung gGmbH

    Together with our customer we engage for better living conditions and a greener planet. Since December 2018, the Grünwelt Stiftung gGmbH is coordinating all charitable activities for the Grünwelt group.

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    Amperax Energie GmbH

    Amperax Energie GmbH is a fast-growing German wind turbine producer. Our direct-drive wind energy plants are developed and produced in our facility in Itzehoe.

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    Callax Telecom Services GmbH

    The Callax Telecom Services GmbH is a fast-adopting telecommunication company. With a quick decision-making team, CALLAX can react to changes in the telecommunication market accordingly.

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    Universal Utility International GmbH & Co. KG

    UUI is an independent international energy broker. We combine trading knowledge and intelligent systems with pioneering spirit. With unobstructed vision to open markets, we can generate additional value for our customer.

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    Grünwelt Wärmestrom GmbH

    Since 2011 Grünwelt Energie is the brand for climate neutral energy products with fair prices and conditions. We wanted to present much cheaper products to our customer because green energy products were expensive for the time being.

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    Bay Temiz Enerji Elektrik Üretim A.Ş.

    The Bay Temiz Enerji Elektrik Üretim A.Ş plays an active role in the energy transition. It is a full green energy producer generating all green energy.

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    Grünwelt Energie GmbH

    Grünwelt Energie is provider of sustainable green energy and climate neutral gas in Germany. Our products are now also available everywhere in Austria

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    Evocar (currently being founded)

    The car subscription reinvented. Every customer has his own needs for an environmentally friendly behavior. Evocar combines all solutions for a common goal for an eco-friendly future.

Contact Us

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  • Do you have an idea, a solution for the challenges of the energy transition or your own start-up project within our field of activity?

    Then send us an email at   ventures@callax.net