A two-step methodology that aims to select the cost-optimal solutions for retrofitting of buildings in large-scale renovation process (200-300 dwellings). From a set of different potential combinations of passive elements (e.g., adding different insulation materials with different thickness and/or windows) and active elements (e.g., heat pumps / multi-split air conditioning for heating, cooling and DHW and/or photovoltaics), the methodology helps to select the most appropriate combination considering the energy performance and economic parameters. The process aims to select solutions that achieve a 50% reduction in the energy demand and/or a significant improvement in the thermal comfort conditions. A detailed economic model is part of the methodology giving as a result the following outputs: investment costs deducting grants for each owner and life cycle global costs.

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Use of eco-friendly local construction materials and traditional craftsmanship in sustainable renovation projects. By combining natural and low-impact materials, such as timber and local sandstone, with modern construction techniques, it aims to reduce the environmental footprint of buildings while supporting local producers and preserving traditional building knowledge. An online catalogue of sustainable construction solutions further helps designers and builders compare materials based on their environmental performance and encourages the wider adoption of locally sourced, circular building practices.

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Solar PV scale smart battery systems are an integrated energy solution that combines rooftop solar photovoltaic (PV) panels with on-site battery storage in large residential buildings. The system is designed to demonstrate and monitor how locally produced solar energy can be stored and optimally used at building and neighbourhood scale, increasing self-consumption, reducing grid dependency, and improving overall energy resilience.

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Use of digital technologies, such as satellite images, street-level photos and 3D scans, to automatically analyse buildings and identify those with similar characteristics. By looking at features such as roof shapes, façade designs and construction materials, the system creates a kind of “building DNA” that groups buildings into common types. This makes it easier to plan large-scale renovations, identify suitable retrofit solutions and accelerate the delivery of energy-efficient upgrades across entire neighbourhoods.

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AI-based prediction for the placement of PV module and of the amount of RES (PV, heat sources) to achieve net-zero or positive energy balance

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A new fixing system was developed for attaching Renew-Wall prefabricated energy renovation panels to existing building walls. Through on-site trials and lab testing, various options were evaluated for improved speed, safety, reversibility, and ease of installation, including steel brackets, threaded rods, and systems inspired by ventilated curtain walls. The final solution, used in the Povo demonstration project, features a support frame of vertical and horizontal timber elements anchored to the existing wall with dowel-type fasteners. The Renew-Wall panels are then secured to this frame using timber screws and pre-installed steel plates within the panel’s timber structure.

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Multifunctional Heat Pump Systems provide heating, cooling and hot water through a single, highly efficient solution. The system combines heat pumps with innovative solar panels that generate both electricity and heat, reducing the need for fossil fuels. It can also recover waste heat from cooling and reuse it to preheat water, making better use of available energy. Particularly suited to residential buildings, this approach delivers greater comfort while lowering energy consumption and carbon emissions.

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The Building-Integrated Photovoltaics (BIPV) monitoring system helps evaluate how different solar panel technologies perform once they are part of a building façade. It measures each panel’s voltage, current, power output, and surface temperature. Tracking temperature is key, as it shows how the panels might affect indoor comfort by heating up the façade. All sensor data is sent to a cloud database for analysis. The system is energy-autonomous: it uses a small battery powered by one of the PV panels, so it can operate in remote or off-grid locations—such as the GESA building in Palma.

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