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IEA EBC Annex 75: Cost-effective Building Renovation at District Level Combining Energy Efficiency & Renewables

For the transformation of existing buildings to nearly zero energy buildings with low greenhouse gas emissions it is important to know which strategy is most cost efficient to reduce primary energy demand and greenhouse gas emissions of the buildings. Especially the right balance between renewable energy measures und energy efficiency measures is of high importance. To give an answer to this topic is goal of this project.

Short Description

Buildings are a major source of greenhouse gas emissions. Reducing their energy consumption and associated greenhouse gas emissions is in particular challenging for the existing building stock. In contrast to the construction of new buildings, there are often architectural and technical hurdles for achieving low emissions and low energy use in existing buildings, and cost-effectiveness of reaching a high energy performance in existing buildings is often lower than in the construction of new buildings.

The transformation of existing buildings to low-emission and low-energy buildings is a particular challenge in cities, where many buildings continue to rely to a large extent on heat supply by fossil fuels. At the same time, there are specific opportunities for district-level solutions in cities.

Within the context of reducing greenhouse gas emissions and energy use in buildings in cities, it is important to know which strategies are most cost-effective. In particular, it is of importance to find the balance between energy efficiency measures and renewable energy measures. Whereas this topic was examined at the level of individual buildings in IEA EBC Annex 56, there is a lack of research on this topic for groups of buildings. At district level, finding the balance between renewable energy measures and energy efficiency measures for the existing building stock is more complex than at the level of individual buildings.

This project aims to investigate cost-effective strategies for reducing greenhouse gas emissions and energy use in buildings in cities at district level, combining both energy efficiency measures and renewable energy measures. The objective is to provide guidance to policy makers, companies working in the field of the energy transition, as well as building owners for transforming cost-effectively the city's energy use in the existing building stock towards low emission and low energy solutions.

Given the limitations due to available financial resources and the large amount of investments needed to transform the cities' energy use in buildings, the identification of cost-effective strategies is important for accelerating the necessary transition towards low-emission and low-energy districts in cities.

The project thereby aims to support key energy actors in cities for taking an active role in the energy transition, based on giving them better insights into the cost-effectiveness of various strategies. It is intended that this allows them to take more informed policy decisions or investment decisions and increases also their confidence in undertaking related actions.

It is planned to involve stakeholders such as policy makers, companies from the building sector active in the energy transition as well as building owners at an early stage in the project to make the research as useful and well adapted to their needs as possible.

Participants

Austria, Czech Republic, Denmark, Italy, Portugal, Spain, Sweden, Switzerland

Contact Address

AEE Intec
David Venus
Feldgasse 19, 8200 Gleisdorf
E-Mail: d.venus@aee.at
Web: www.aee-intec.at

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