District Heating Plant Graz

Austria's largest solar thermal plant

The world's largest field test for solar thermal collectors

The solar district heating plant "Fernheizwerk Graz" provides a direct link between research, plant construction and operation.

From Energie Steiermarks central District heating plant in Graz, the major part of the City’s District Heating  with a peak load of 550 MW and an annual demand of app. 1200 GWh supplied to the town and some villages around. At the time of construction, winter time supply was mainly from CHP and summer time DH supply mainly from gas heating plants. Therefore it was aimed to learn about the potential of integration of solar thermal and to reduce CO2-emissions by use of solar thermal.

In 2007, 3.5 MW (5000 m²) of solar thermal were built next to the heating plant on the roofs of the municipal recycling center. Later, areas at the heating plant became available and a collector field for all DH feed-in, testing and comparison was installed. Collectors of 7 different manufacturers and of different technologies were installed. Those collectors were tested and evaluated in R&D projects.

The project is owned by the solar energy service company solar.nahwärme and the heat is sold to Energie Steiermark. The project is an important part of the efforts of the city and of the utility to make the district heating supply greener and more sustainable. It is planned to further increase the solar share in Graz district heating in the future.

Technical Specifications

Comissioning
2007

CO2 Savings
740 t/a

Collector area
8213 m²

Any questions?

Click on the button and we will be happy to help you!

More success stories

Dairy industry in California

Dairy Industry in California produces a wide range of high-quality dairy products for private label, foodservice, industrial and export markets. The company wanted to replace a portion of its energy needs with renewable energy sources. SOLID implemented an effective, long-term and sustainable solution.

Read more »
The latest updates

Subscribe to our newsletter

Green news: Latest trends in the spotlight