The Spanish demo case is a Renaissance palace from the 16th century located in the historical centre of Valladolid. The historical heritage of the building will be protected in the refurbishment of the palace towards positive energy standards by keeping the façade unchanged.  Historic buildings currently represent more than 30% of the European building stock, accounting for more than one third of the total energy consumption of the European residential sector. The EXCESS PEB will therefore set an important example and blueprint for deep renovation of – as well as renewable energy generation and storage integration in - protected historic buildings.

The project foresees the entire renovation and subdivision into 9 separate apartment units, 5 of them as duplex apartments. To minimise the energy demand while keeping the historical façade, highly energy efficient appliances and other technologies will be installed. The internal design of the building will be shaped as to maximise renewable energy self-consumption, making it one of the very first positive energy buildings in Spain.

Key technologies & innovative solutions

The energy concept of the building takes into account the local climatic conditions, which are characterised by mild temperatures and high solar radiation. As sunshine is an abundant commodity in Spain, the Spanish demo concept relies on maximising the electricity production from conventional PV panels installed on the roof of the building. The produced PV energy will supply energy for household electricity for collective self-consumption, and for two EV charging stations. The stations are part of the PEB concept to promote local electro-mobility in the area. Any PV surplus energy will be stored in a local battery, or sent to the grid. Domestic hot water will come from additional PVT panels. Moreover, the building incorporates sustainable design features such as a very efficient envelope and interior thermal insulation, and natural and mechanical ventilation to recover heat from the individual housing units.

The innovative work carried out in Valladolid will feed into replication activities, focusing amongst others on an urban development project in Granada (Spain) called NIVALIS which aims to become Spain’s first Positive Energy District and is informed by EXCESS.

Expanding Flexibility
30 kWh lithium batteries for advanced energy flexibility functionalities and continuous supply.

Building level innovation
Installation of 40KW heat pump for heating & cooling, 55 KWe PV, 2,8 kWe hybrid photovoltaic / thermal panels (PVT) installation and 2 EV charging stations

System level innovation
An integrated control system enables the balancing of energy generation, consumption and sharing. The human machine interface allows for intelligent, user-centric energy management.


Smart contracts
The Building Energy Management System (BEMS) regulates energy sharing and trading to reduce overall energy consumption.

Upcoming milestones

Major project milestones for 2023 include the complete renovation of the building and the start of sales of the individual apartment units. In late 2023 data collection on the building’s energy performance will start through installed monitoring commodities.

Further information & resources

As a H2020 funded project, in-depth and technical information on the demo cases is made available to the public in the form of reports that can be downloaded via the EXCESS website (a selection of these is included below). Further, the download section on this webpage features relevant media coverage and special mentions in newsletters. The image section will be updated as the project progresses. Project plans, renderings and a video are being developed by the architecture studio U·rb atelier.