Study tours

A collection of selected video tours of renewable district heating plants across Europe. *Come back for updates!*

The videos are published in different languages, but you can easily add automatic English subtitles: click on the image to open the video, then on the Youtube video click on "settings", select "subtitles" > "automatic translation" and finally select the English language. Don't be afraid: we've tested it and the translation is good!

STUDY TOURS (click on image to watch video)



Since the pandemic prevents COOL DH project from welcoming visitors and arranging study tours, Lund Municipality and Kraftringen decided to arrange a virtual study tour to Brunnshög that you can join whenever you like. In this video Markus Paulsson, energy strategist in Lund municipality and Sara Kralmark, project manager at Kraftringen, guide us through some of the highlights of the low temperature district heating grid in Lund.

(10:42 min)


In Berlin Köpenick, Vattenfall has commissioned the city's largest solar thermal plant to date (2018).

 (2:05 min)


In August 2018, a solar thermal collector field will be commissioned in the Randegg heating network in addition to the biomass boilers. Bene Müller from Solarcomplex AG expects that the boilers will thus remain switched off during the summer months. (

This video was created as part of the Solnet4.0 project.  (0:36 min) (6:05 min) (0:38 min)


Interview with Eckard Veil (Technical Managing Director Energie und Wasser Potsdam) about the new over 5.000 m² solar thermal plant, which provides heat for the Potsdam district heating network.

(5:16 min)

In Ludwigsburg und Kornwestheim Germany´s biggest solarthermal plant was build.
It supplies the district heating system of the municipal utility with renewable energy.
The video reports on the construction work and explains the motivation of Stadtwerke Ludwigsburg-Kornwestheim (SWLB).

(2:47 min)


The solar energy village of Mengsberg, winner of the German Solar Prize, has been successfully supplying its residents with sustainable energy from the sun and biomass since 2018.

(3:57 min)

In October 2020, the second biggest solar thermal plant of Austria was put into operation in Mürzzuschlag, one Styrian municipality.
It feeds heat into the district heating system of the Stadtwerke Mürzzuschlag. It covers 100% of the heat demand in summer and 10% of the total heat consumption of the district heating system all over the year.

(from min 1:54 to min 5:50)


The 990 m2 solar thermal plant provides heat to the district heating network in the city of Varese. It uses already existing water storage tanks with a total volume of 215 m3. To obtain a lower average working temperature for the solar collectors, however, the solar circuit can also pre-heat the cold water which is needed to restore water losses in the grid and which is taken from public water supply at 10 °C. 

Video (4:04, in Italian) on technical aspects:
Video (1:24:46, in Italian) telling the whole story of the plant, also including the authorisation procedures:

Article (in English):
In 2015, after more than six years of preparation and hard work, the first and only communal biomass heating plant was constructed in the Municipality of Pokupsko (North-West Croatia). It provides heating to public and commercial buildings as well as households located in the centre: currently 30 consumers are connected to the district heating system, while there are plans to connect other parts of the municipality.

Almost 70% of the area of the Municipality is covered with forests, many of them private, and this is one of the main reasons why the plant has been established right here. Also a biomass trade and logistic centre was established, which provides a big support to the utilisation of local wood for heating. This is a direct result of an EU funded project (BioRES project within the Horizon2020 programme) in which Pokupsko Municipality participates through the North-West Croatia Regional Energy Agency.

The final result is that currently more than 75% of energy needs in Pokupsko are satisfied through local resources, with the plans to reach 100% within the next five years!

(9:56 min)

Murau is a small Austrian town is situated in a densely wooded area. Murau's energy vision is to be energy self-sufficient: for this reason the small town has built a biomass DHS, that is able to cover the heat demand of the biggest heat consumers of the town – among them the rehabilitation centre Stolzalpe and the Murau's brewery.

In 2019 three wood gasification and power to heat plants were installed. Now it is possible to switch off the initial heating boiler plant during the off-peak periods. This allows a much better efficiency of the whole system.

By now the route length of the DHS is 11 km and it supplies heat to 93 customers.

(9:51 min)

The COOL DH-project has now run for more than three years and the results are starting to show! In this video you will see how low-temperature district heating and large heat pumps are an essential element in Høje Taastrup District Heating and Høje-Taastrup Municipality’s collaborative journey towards an efficient, flexible and smart energy system.

Many exciting and innovative solutions for energy efficiency and low temperature district heating are coming together, engaging both businesses and citizens in creating a sustainable city district.

(7:38 min)


Thermal power plant fueled by wood chips serving the town district heating network of the Italian Municipality of Pomaretto. The plant was put to operation at the start of 2018: a modern 600 kW system heats 70 homes, the hospital and the municipal public buildings, allowing savings in energy costs of up to 50%.
The wood chips come from neighboring PEFC-certified forests.

/ Video in Italian /

(3:54 min)

The transition of our heat supply is one of the most important aspects on the way to climate neutrality. The municipality of Rosenfeld shows that climate protection and comfort can be well combined by a heating network. For almost 10 years, a wood-fired heating plant has been supplying the community based on the locally available raw material of forest residues. Originally initiated to supply the municipal buildings, many citizens as well as industrial companies quickly wanted to connect to the network as well.

/ Video in German, with English subtitles /

(5:48 min)

Wood energy and solar thermal energy are a perfect pair for the heat turnaround in rural areas: After an intensive three-year planning phase, Breitenholz is becoming a solar and bioenergy village initiated by the cooperative Bürger-Energie Tübingen eG. The entire village will be connected to district heating. The heat in it comes to 100% from renewable energies. A solar coverage of 37% saves valuable resources.

/ Video in German, with English subtitles /

(5:14 min)

Energy supply is a central issue for sustainable and future-oriented community development in rural as well as urban areas. Starting from the municipal buildings, renewable heating networks have been created in the villages Mehrstetten and Pfronstetten on the Swabian Alb. The district heating systems are to be operated in a cooperative model by Energie für Bürger Mehrstetten eG and by the municipality of Pfronstetten itself.

/ Video in German, with English subtitles /

(06:03 min)

The Mijnwater demonstrator in Heerlen includes an existing neutral-temperature DHC network, which is under expansion. The network exploits a large underground seasonal storage than can accumulate energy up to 30°C. The district heating network consists of a 2-pipe system with a hot and cold pipe for distribution, exchange and storage energy.

The aim of the demonstrator is to install and test an inter-day, large-scale (20,000m3), underground central storage tank, capable of exploiting industrial waste heat.

(01:46 min)

The largest solar thermal plant in Austria has being installed in Friesach, Kärnten in 2021. It will cover 100% of the heat demand of district heating customers in Friesach during the summer months. The solar heat is fed into the existing district heating network of KELAG Energie & Wärme GmbH in Friesach. 

(02:15 min)