The cities of Helsingborg with 97,122 inhabitants and Helsingør with a population of 46,279 are separated by a mere 4 km stretch of water and a 20 minute ferry ride. Cooperations between the two cities are extensive in many fields.

Galanta is situated in the south-western part of Slovakia, near Bratislava. Spread over 396 ha, the town has 16 500 residents. The exploration of geothermal energy in Galanta began back in the 1980s when drilling works for geothermal wells were initiated. Since the mid-1990s, these wells have been used for heating the energy supply via district heating.

Delft, with 100,000 inhabitants in the province of South Holland between Rotterdam and The Hague wants to become a CO2 neutral city. In relation to that ambition, the City council adopted the Update Climate plan 2008-2012 with the objective to emit 15% less CO2 by 2012, raise the share of renewable energy to 5% of the total Delft energy consumption in comparison to 1990 and use 15% less energy.

Birstonas demo site was not implemented. The project found that it is not feasible to deeply refurbish social housing which is collectively owned by the inhabitants (energy bills are paid by the municipality therefore there is no incitement energy saving). If financing sources such as structural funds can be combined with other funds that together cover more than 50% of the costs, then it can be possible. As this was not the case, the original plans in the project with the demonstrations in Lithuania were canceled.

Amsterdam is known for its historic houses, but it also has many apartment buildings constructed in the 1960s. The CONCERTO project in Amsterdam is eco-refurbishing some of these more modern blocks in the Amsterdam New West neighbourhood.

A total of 300 1960s dwelling houses will be refurbished by the project, providing inspiration for 50,000 further dwellings that could be renewed in the same way.