Active Energy Tower - Fronius banks on energy efficiency

In autumn 2012, Fronius International GmbH opened the Active Energy Tower at its Wels site in Upper Austria. Its active energy design, use of photovoltaics (PV) and geothermal energy sources mean that the architectural showpiece is heated and cooled without generating any CO2 emissions whatsoever.

The Solar Electronics Division, which is celebrating its 20th anniversary this year, moved into its new, creative working environment at the end of September.


"The Active Energy Tower demonstrates that the dedication of Fronius to energy efficiency goes well beyond its products and services", explained Martin Hackl, head of the Fronius Solar Electronics Division. The impressive fašade of the energy tower also provides shade and thermal insulation for the building, saving the energy that would otherwise be required for cooling and heating.

The new part of the building, which blends seamlessly into the existing building complex, has been given over to modern office accommodation. On the ground floor, a green vertical garden designed by Patrick Blanc, the French botanist and garden architect, creates a welcoming atmosphere. "We are currently working on the realisation of another highlight, a showroom, that will give visitors a closer look at some applications of our products", revealed Martin Hackl.

The climate-protection fašade provides shade while at the same time generating energy that can be used in the tower. A visual highlight is provided by the glass fašade elements, which contain crystalline cells. This special development consists of 146 modules supplied by ertex solar and is rated at 38.3 kW. The photovoltaic roof system comprises 60 Kioto modules. These are polycrystalline modules (cSi) rated at 12.6 kW. At the heart of each system are three Fronius IG Plus 150V inverters and one Fronius IG Plus 100V, which ensure maximum yield levels from the Active Energy Tower.

Environmental awareness as a company value
At Fronius, environmental awareness is very important. The Fronius guiding principles, "Our grandchildren will be proud of us for the decisions we make, because we are committed to our environment and to society. The technologies we are developing play their part in taking care of the world's resources", influence the daily decision-making processes of Fronius staff.

Back in 2006, the company started the phased, energy-saving renovation of the former industrial district in Wels. Today, this has become its global sales hub, and with the Active Energy Tower now boasts an additional architectural highlight. "We take great pride in the fact that we are able to work in a very energy-efficient manner at Fronius sites. For Fronius, environmental awareness is a well defined company value", says Martin Hackl.

Energy efficiency in Austria
In Austria, the home of Fronius International GmbH, the production and logistics facility in Sattledt is supported by a 615 kW photovoltaic system. A biomass power plant provides 80 percent of the heat requirement; geothermal systems are installed at three of the company's sites in Austria. Sustainable energy usage and storage is also a high priority within the company, as evidenced by an in-house logistics solution that uses fuel-cell powered vehicles.

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