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This report is a policy briefing containing the main findings of the PhD project Co-Creation of Sustainability-Oriented Innovations (SOIs) in Tourism. This project was conducted in close partnership with the Barcelona City Council to co-design institutional innovations to address sustainability challenges in the city by widely engaging stakeholders in a participatory process. To enable an open participatory process, the project was nested in the Consell de Turisme i Ciutat, which gathers key public, private and civil society organizations to discuss the main tourism development issues in the city of Barcelona. The project gathers data by conducting individual interviews, and a series of stakeholder workshops to better understand the complexity of designing SOIs collectively. Amongst the main findings, this report identifies how individual and collective conceptual nuances of innovation and sustainability affect the stakeholders' ability to embark on sustainability innovations in tourism. Further, it describes collective objectives, drivers and barriers that stakeholders identified when developing SOIs. The report also offers an analysis of current tourism specific and non-tourism SOIs in Barcelona and potential ways in which these existing SOIs could be leveraged to facilitate systemic change. One of the key findings of the study is a collection of co-created SOIs by the stakeholders, which are analysed in terms of their sustainability impact and their type of innovation. These SOIs include a wide range of policy actions and interventions related to management, product development and marketing, education, incentives and monitoring and evaluation. Amongst these SOIs, during the project, the stakeholders decided to focus on expanding on four SOIs which could have a greater potential to create systemic change in the sustainable development of the city and thus in the tourism sector. These four SOIs are presented in this report as one-page business plans to facilitate its potential application. Finally, the study provides a series of recommendations to enhance collaboration and governance mechanisms to allow SOIs to thrive as collective actions that are powered by legitimacy, trust and a fair distribution of power. In this line, to empower stakeholders to utilize the findings of this project the report introduces the idea of creating a Sustainability Innovation LivingLab.

AMADEUS es un proyecto europeo que investiga materiales y dispositivos de estado sólido para almacenar energía a muy alta temperatura. Usando aleados de silicio como materiales de cambio de fase se alcanzan calores latentes superiores a 1000 kWh/m3, propiciando la obtención de altísimas densidades energéticas. Dichos aleados suponen temperaturas de almacenamiento por encima de los 1000 ºC, muy por encima de las de los sistemas actuales de acumulación térmica. El artículo describe las actividades del proyecto y sus primeros resultados, explicando los principales retos de este nuevo sistema que combina la acumulación de energía en forma de calor en silicio fundido con dispositivos de estado sólido termiónicos y termofotovoltaicos para la posterior conversión en electricidad. AMADEUS is a H2020 project that researches on materials and solid-state devices for very high temperature energy storage and conversion. By exploring silicon-based alloys as new phase change materials (PCMs), latent heat higher than 1000 kWh/m3 is achievable, which implies a very high energy density. In addition, silicon-based PCMs lead to storage temperatures well beyond 1000 ºC, well beyond that of current state-of-the-art thermal energy storage (TES). This paper describes the project R&D activities and first results, and comments on challenges towards a new kind of systems combining latent heat energy storage in molten silicon with thermionic and thermophotovoltaic solid state heat-to-power conversion.