Welcome to Green Solar Cities

Concerto project Green Solar Cities is expected to be a driving force for change into climate protection, use of renewable and sustainable energy efficient building for large reconstruction urban areas in Copenhagen and Salzburg.

A vision - an EU-project - a book
Green Solar Cities started as a vision, was implemented as an EU-project and is now published as a book called "Energy solutions for smart cities and communities." The book can be downloaded via the link below or from among other of the projects publications under "Publications / Book" in the menu.
Energy solutions for smart cities and communities (2.93mb)

Final report

By the end of the project, we can conclude that Green Solar Cities is a policy for cities focussing on a holistic approach, which includes good, energy efficient constructions and installations in buildings leading to comfort and a good indoor climate, combined with use of optimised energy supply systems together with a local contribution from renewable energy sources. And in this way it lives up to the aims of the EU Concerto programme in a strong way, especially when good energy results is secured by help of an appropriate performance documentation as part of the strategy, something which is already known will be a future demand from the EU Building Directive.

Read the final reports under "Publications / Reports" - and more details under ”Demo projects”. Further more the three magazines, telling about the projects, can be downloaded under ”Publications / Magazines".

Here you can download the executive summary:
executive_summary_selv_140218PDF.pdf (279.71kb)

Last partner meeting in Salzburg 16th April 2013
At the meeting the partners presented the results on calculated and monitored energy performances on the demo buildings in Salzburg and Copenhagen. The figures give a fine indication of the achieved results.
The buildings fulfil the EU Concerto energy demands.
The comparison between the different buildings has been quite a hard job due to fact that the building regulation on energy performance has changed during the project period.

Partnermeeting in Copenhagen 9 - 10 October 2012

Green Solar Cities partners including a political group of reresentatives from Salzburg City first visited harbour areas in Copenhagen for amongst others visit to the Concerto project "Teglholmskolen" a new school that has just been finished following 2015 low energy standard.
Then Karensminde in Valby "the cheap buildings to make affordable housing for normal income people", Water Cultural Centre and Langgadehus new-built elderly centre with connected family dwellings made as prefab low energy elements.
Second day was for the partner meeting and some visits in Copenhagen to get inspiration about rooftop buildings, open spaces etc.

Henkel old industrial building now renovated to low energy office building
Ny Ellebjerg new-built family dwellings and a kindergarten

Ongoing renovation of 288 dwellings Hornemanns Vaenge
Rooftop greening in Copenhagen

GSC partner group on Copenhagen square
Open urban spaces were visited in Copenhagen

Water Cultural Centre in Valby opened 15 March 2012

Besides excellent sauna facilities, it offers 3,530 m2 facility at the hot tub, waterslide, children's pool, counterflow channel, caves and much more.
This Culture and Leisure Swim Centre focuses on minimizing energy consumption without compromising functionality. The Swim Centre will use 25% less energy than similar facilities elsewhere in the country.

The architects and engineers have worked closely together to get a low energy consumption possible. The building has among other south windows with triple glazing, insulated frames to save on heating and low energy illumination. In addtition is installed 19,1 kW solar cells.

Stadtwerk Lehen housing finished in autumn 2011

The northern part is nearly finished and handed over to the users: the student dormitory in August 2011 and 289 apartments in November 2011. The last works on the Kindergarten and the commercial and common areas in the ground floor are in process and will be finished till March 2012. The buffer tank has been erected in May 2011 and the first part of the big thermal solar plant with 1500m² collectors has started working in November 2011.

289 new-built apartments finished
1500 m2 central solar plant located on the new housing roofs

Danish delegation visiting Stadtwerk Lehen
200.000 litres buffer tank for the solar heat storage

Norwegian Concerto III visit to Valby

Norwegian delegation visited Valby Concerto project in August 2011 – to see some of ongoing demo projects and hear about Valby Concerto experiences. Participants are representing a new Concert III project with Norwegian city Trondheim in cooperation to a Spanish city and Szentendre in Hungary, who also is associated city in the Green Solar Cities project.

Norwegian Concerto III project group visiting Concerto II project in Valby August 2011
Visit to Langgadehus new-built elderly centre

Salzburg site visit 23 May 2011 - ongoing construction etc.

EU technical officer Mr. Mario Dionisio and connected technical expert Mrs. Helena Granados Menéndez visited following Concerto building sites in Salzburg on 23 May:
Stadtwerk Lehen area (former Salzburg AG utility area with high-rise building)
Infopoint (for information to citizens about ongoing Concerto building)
Strubergasse (being planned for renovation – not final decided yet)
Kuenburggasse (finished renovation)
Esshaverstrasse (finished passive house new-built 12 apartments)
Neue Mitte Lehen (former football stadium – new-built 48 apartments)
Siebenstätterstrasse (new-built elderly center with connected dwellings)

Stadtwerk Lehen area
Neue Mitte Lehen




Green Solar Cities partner meeting - 1 and 2 July 2010

in Copenhagen and Malmö

Workshops in Copenhagen 1 July 2010

Solar cells - site visits Malmö 2 July 2010

BO01 - building exibition area from 2001 -
Malmö Harbour

Urbana Villor - low energy building Vimpelgatan, Malmö

Siebenstätterstrasse - construction started March 2010

New built dwellings, social housing and senior residence with 200 m2 solar collectors and controlled air ventilation

Stadtwerk Lehen area - construction started October 2009

300 new social dwellings, kindergarten and student dormitory

Valby site visit 19 March 2010 - ongoing construction work etc.

Dronning Ingrids plejehjem

Solar cells - a new landmark for Valby

EU technical officer Mario Dionisio visited Valby demo projects in
connection to revision of Valby Concerto project. Due to recent two years
slow down in Danish building sector some of first planned demo projects
cannot be implemented within the 5 years Concerto timeframe. Thus some
changes were agreed to sustitute with a few of other observed projects in
Valby that until now has been on a "waiting list".

Kuenburggasse, Salzburg - nearly finished renovation

First renovation in Salzburg comprises 45 apartments, built in the early 50th. The renovation includes complicate details with loggias, gateways and decoration. A thermal renovation in the apartments should reduced energy consumption from 133 kWh/m²a to now 43 kwh/m²a by connecting to district heating (partly industrial waste heat and biomass).The renovation started in April 2009 and is nearly finished.

Neue Mitte Lehen, Salzburg - finished new-built January 2009

The building consists of 48 social appartments with total 3.700 m² living area and include a senior event center, a seminar room, the new city library and some shops.The building is a low energy building and have 140m² thermal solar collectors. The buiding was built from 2006-2008.

Copenhagen´s Climate Plan will be supported by Valby and Salzburg

Green Solar Cities partners visited demo projects for low energi housing in Valby on May 14.-15. 2009.

The entrance to Carlsberg "Vores by" (Our City) and building section number 17, where local document is ready and detailed project work ongoing comprising some 14.000 m2.

You may take a virtual walk in the new "Our City" by clicking here:


Jakob Klint, Kuben, tells about the first 12 built "Cheap Dwellings" (part of Copenhagen mayors programme to provide affortable dwellings). In the picture to the right the housing co-operative "Vildrosen" (Wild Rose) is seen. "Vildrosen" includes 46 low energy II dwelllings and solar collectors are being put up.

Valby School exploits the solar energy. And in March 2009 work of art was inagurated on the gable of "Proevehallen", where the artist Anita Jørgensen has decorated with red neon tubes and solar cells, which has become a new significant landmark for Valby seen daily by thousands of train passengers.

The Old area of the Football Stadium becomes "Neue Mitte Lehen"

Site visit to Salzburg - low energy housing - 21.-23.Oct 2008

With relatively limited resources over the past 10 years, Salzburg has created a development, where solar power, biofuels and passive construction has become the mainstream in the social housing. This trend has spread to the private buildings and achieved quite significant results. Simultaneously, they have developed energy management and monitoring systems, which further helped to reduce the energy consumption from buildings.

The background for the results achieved depends, among other, on a high level of political commitment and cooperation between the region, the City and the social housing association, where some relatively simple and cost-neutral forms of financing have provided the basis for development.

The purpose of the trip was to get inspiration and knowledge of the political, organizational and technical experience with energy optimization of buildings in Salzburg, as well as strengthen a network in Copenhagen, so the development and the realisation of low-energy buildings and energy renovation can be promoted.

30 representatives from the Danish architectural and engineering firms, municipalities, manufactures et al. participated - with Peder Vejsig Pedersen, Cenergia as courier. As a political representative of the Green Solar Cities project in Valby John Nymark attended from Copenhagen City Council.

The Cooperation in the EU Concerto project “Green Solar Cities” between Valby and Salzburg, about low energy housing and renewable energy, allows Copenhagen to get a direct knowledge of the experiences in Salzburg, and on this background a trip to Salzburg was arranged between the 21.-23. Oct 2008.

Esshaverstrasse - 12 newly built apartments after passive house standard

The Concerto site is located in the Lehen district of Salzburg, a high-density area near the center of the city. The district mostly consists of multi-story residences built between 1950 and 1970, though in recent years its basic composition has undergone fundamental change: the soccer stadium was demolished, commercial zones were abandoned, and the small shops along Ignaz Harrer Street moved to large shopping centers or closed down entirely.

During the next few years, targeted construction projects will be carried out to revitalize the district, reintegrate major components of public life (e.g., the city library), and create desperately needed rental apartments. Moreover, two new S-Bahn stops are to be built on the city’s rail line, giving the district a new level of accessibility by way of public transportation.

The building of the total 1,060 m2 residences is the first completed result of the Green Solar Cities project in Salzburg. With a energy consumption of 1.5 kWh/m2 it is far below the passive house limit - water based heating convector above the door in the living room heats fresh air - the heat for this, as well as for hot water, comes from a total of 37 m2 solar collectors with a battery which thereby supplements the low-temperature district heat. The room temperature and the volume of fresh air are adjusted individually in each apartment.

Heat recovery ventilation also supplements heating.

The East-west orientation of the apartments prevents extreme summer temperatures - and at the same time there is an opportunity to shield about 30% of the window area towards west by movable wood shutters. The windows have 3-layer glass with an Ug-value 0.5 W/m2K. From an underground parking area up to the private balconies, there are disable friendly access. The alongside balcony plates, towards the apartment, is efficiently broken by insulation materials which is only crossed by concrete steel whereby thermal bridges are eliminated.

The 12 social houses are built by the cooperative housing association “Die Salzburg” – the building has just received the Energy Globe Award awards.

Gneis-Moos - low energy buildings from 2000 in the southern outskirts of Salzburg

The Settlement area is exempted for cars via a parking area below two houses and by a parking area at the entrance to the area - perhaps a bit unfamiliar seen with Danish eyes of a residential area adjacent to the green fields in the city's outskirts.

A total of 61 dwellings spread out on 2 and 3-room apartments is supplied by heat from 410 m2 of solar collectors with a 100,000 liters buffer tank and additional natural gas-fired boiler, which through the local micro-heating supplies all the apartments. Build by the cooperative housing society Gswb.

Heat recovery in the ventilation is located in the basement in order to heat the fresh air intake and to the heat the basement rooms so that condensation on the walls is avoided. This must be seen in the context of waterproof concrete in the basements which is 1 meter under the groundwater level because of the low-lying area.

Passive solar energy is used in the glass covered balconies in front of the living rooms - and contributes with around 300 kWh per year for the 107 m2 3-room apartments. Time to time this can be compared with the disadvantages of the warmest summer period due to overheating if you are not at home to adjust by opening between the living room and glass covered space and outer damper window. Heat recovery contributes with around 1100 kWh yearly for the apartment- and the overall consumption is thereby reduced by approximately 23% to about 4700 kWh annually.

Passive house building Franz Ofnerstrasse

The building on Franz Ofnerstrasse is the largest passive house construction in Salzburg - with 91 apartments with a total area on 9,530 m2 - with the motto "low budget living" and a strong emphasis on the social environment, including a café and a 2 floored common room for the residents, and with disable friendly interior from the parking basement all the way up to the large 12-17 m2 balconies on the 6th floor.

Regarding design of outdoor areas – focus has been on high satisfactory of the tenants for all ages. 3-layer window deaden noise from the nearby railway and contributes significantly to energy reduction with Ug-value 0,5 W/m2K.

A total of 270 m2 of solar panels supplies around. 100,000 kWh per year covering about. 50% of energy for hot water and heating. It is a record low consumption in Salzburg in other words around. 2200 kWh annual consumption of the average. 90 m2 apartments.

Passive house building Samer Mösl – completed in spring 2007

60 apartments in 3-storey timber construction is the largest passive house building, in Austria, made of wood. The solar collector, with a total size on 200m2, is located on the top of the roof of the center block and heats the water in the 21 m3 buffer tank placed in the basement. The tank supplies about 90,000 kWh yearly to warm water and heating via heating convectors in connection with fresh air inlet.

As a supplement, in the winter period, there is a 100 kW wood pellets boiler which works as a local district heating supply to all apartments via a micro net with a very small loss of heat.

It emphasized that the residents are very happy - and that the controlled ventilation with heat recovery, combined with the timber construction specifically addresses allergies with good climate.

The building has achieved maximum points by the certification as "climate active passive house" - a system developed in Austria. Build by the cooperative housing society Heimat Österreich.

Low energy building outside the city area - Faistenau

The building with 3 multi –family apartments with each 5 apartments is the first wooden house construction for the cooperative housing association GSWB. There are 2 apartments at the ground floor and at first floor and a very nice studio apartment at the attic. Timber is selected to match the surrounding character of the forest area.

The solar collector on the rooftop covers 15-20 % of the energy used for hot water and heating. The rest is provided from a wood pellets boiler via a micro net which has become GSWB standard in all new buildings under construction.

By clicking below links you can read more about the two demoprojects in Salzburg and Valby/Copenhagen.



                       Salzburg                                              Valby/Copenhagen

GSC D 8.7.12 Local dissemination materials Copenhagen 6th year.pdf

GSC D 9.2.6 Minutes from Management Team meetings 6th year.pdf

GSC D 9.3.7 Local meetings Salzburg 6th year.pdf

GSC D 9.4.7 Local meetings Copenhagen 6th year.pdf

GSC D 9.5.6 Process report 6 Salzburg.pdf

GSC D 9.6.6 Process reporting Copenhagen 6th year.pdf

Coordinator Salzburg: SIR +43 662 623 455 inge.strassl@salzburg.gv.at                                                       Coordinator Valby: Kuben +45 88332211 jk@kuben.dk