Clean Cities ClimAccelerator is  built on the ecosystems developed within the Deep Demonstration of Healthy, Clean Cities of the City of Vienna and the City of Madrid and is focusing on actual challenges of the respective cities. 

Community retrofit - District renewal systems

Retrofitting buildings to improve the performance of to make them more energy efficient and better at withstanding climate change-induced extreme weather as well to improve amenities for the building’s occupants. Alongside thermal-energetic refurbishment, building services optimization is key to improving energy efficiency. 

  • Reimagining supply chains towards circular construction

  • Carbon Footprint and Life Cycle Assessment of Buildings to Drive Zero Emission Buildings

  • Efficient heating / cooling systems

  • Heating / cooling systems based on electricity


Green spaces, climate resilience & urban adaptation systems

To address climate risk, bolstering public health and community vitality by investing in nature - strategic interventions of nature-based solutions across multiple parts of the city using new models for deployment and engaging citizens. 

  • Efficient use and management of water on urban environments

  • Nature based solutions for physical transformation of public spaces improving health and wellbeing of citizens

  • Urban shading

  • Income generating activities related to natural spaces on cities (ecosystem services)

  • Planning support tools 


Mobility, logistics and public space systems

Mobility, logistics and public space systems are challenging topics in many contemporary cities. These topics give rise to important questions such as how does the element of public space affect the sustainability of urban mobility in contemporary cities? How does facilitating mobility contribute to the livability of the public realm? How can we trigger home-working shifts and mobility changes for systemic benefit through public-private partnerships?

  • Building sustainable infrastructure — physical and digital — to support innovative mobility solutions 

  • Promotion of public transport and discouraging of private parking

  • Electric mobility: charging infrastructure

  • Solutions for the city of “15 minutes”


Renewable energy systems

Renewable sources – e.g. from geothermal energy and low-temperature waste heat – must be developed to step up district heating and to increase the share of distributed generation of electricity.  The use of state-of-the-art technologies and high environmental and energy awareness have to  underpin the actions of private households, the municipal administration, with decentralised renewable energy supply in urban quarters suitable for this purpose playing an important role in this context.

  • PV

  • Development of energy communities for the deployment of decentralised renewable energy solutions

  • Tools for verifying the fulfilment of energy efficiency / carbon footprint on projects

  • Mapping of available building roofs for energy generation


Information and data systems 

Cities follow different strategies towards decarbonization that typically involves a combination of different solutions, approaches and economic sectors. But to achieve long-term goals require information, data, tools and processes as foundation. For example, data can be used to  transform municipalities into being more efficient, effective and evidence-based. In addition, other enablers or leverages could introduce innovations on processes or regulations allowing the acceleration of the decarbonization. 

  • Data management for decarbonization

  • Life cycle and carbon footprint analysis to support decarbonization processes on cities 

  • Methodologies and tools for carbon absorption assessment 

  • Data spaces: assessment and forecast systems for the design of environmental policies based on digital capabilities

*the subtopics are examples and not an exhaustive list.