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VIENER SA ENERGY FIRMS

Greek energy company supplying electricity and natural gas, aggregating demand response, and trading energy, primarily serving Viohalco group companies.

Last updated September 29, 2026

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Overview

Viener S.A. is a Greek energy company that has participated in energy markets since 2017. Its activities cover electricity and natural gas supply, demand response aggregation, energy trading, and energy consulting. The company's stated mission is to provide efficient energy management in order to achieve competitive energy prices and low-carbon energy consumption for all companies and industries belonging to Viohalco companies. Viener provides services for large industrial and commercial consumers, drawing on experience and technical know-how in energy markets. It is part of the Viohalco group, a major European metals processing group headquartered in Greece. The company operates primarily in Greece and focuses on serving the energy needs of Viohalco's industrial and commercial companies, while also offering its services to other large consumers.

History

Viener S.A. has been active in energy markets since 2017. It was established as part of the Viohalco group, a major Greek industrial group, to manage energy procurement and related services for the group's companies. The company's activities include electricity and natural gas supply, demand response aggregation, energy trading, and energy consulting. Its mission is to provide efficient energy management to achieve competitive energy prices and low-carbon energy consumption for all Viohalco companies and industries. Viener serves large industrial and commercial consumers, leveraging its experience and technical know-how in energy markets. The company operates primarily in Greece.

  • 2017

    Viener S.A. begins participation in energy markets.

Products and positioning

Efficient energy management for large industrial and commercial consumers, with a focus on competitive prices and low-carbon consumption, primarily within the Viohalco group.

  • Electricity & Natural Gas Supply

    Supply of electricity and natural gas to large industrial and commercial consumers.

  • Demand Response

    Aggregation of demand response for energy markets.

  • Energy Trading

    Trading of energy commodities.

  • Energy Consulting

    Consulting services on energy management and markets.

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