This transdisciplinary research case study sought to disrupt the usual ways public participation shapes future energy systems. An interdisciplinary group of academics and a self-assembling public of a North English town co-produced 'bottom-up' visions for a future local energy system by emphasizing local values, aspirations and desires around energy futures. The effects of participatory modelling are considered as part of a community visioning process on participants' social learning and social capital. This paper examines both the within-process dynamics related to models and the impact of the outside process, political use of the models by the participants. Both a numerical model (to explore local electricity generation and demand) and a physical scale model of the town were developed to explore various aspects of participants' visions. The case study shows that collaborative visioning of local energy systems can enhance social learning and social capital of communities. However, the effect of participatory modelling on these benefits is less clear. Tensions arise between 'inspiring' and 'empowering' role of visions. It is argued that the situatedness of the visioning processes needs to be recognized and integrated within broader aspects of governance and power relations.Keywords: agency, built environment, cooperation, co-production, energy model, renewable energy, resilience, social capitalIntroduction: bottom-up engagement with future energy systemsThe UK energy system is changing, with a transition from a high dependence on fossil fuels to a more complex, varied and intermittent energy supply landscape. The consequences of this for the socio-material environment of neighbourhoods is significant; however, democratic involvement in the shaping of energy futures remains low (Seyfang, Park, & Smith, 2013;Walker & Devine-Wright, 2008). While there is a long legacy of involving local publics in re-imagining the built fabric of their neighbourhoods (Aylett, 2013), this participatory approach has not been brought to bear on the interaction between landscapes, built environment and future energy systems. Adopting what Chilvers and Kearnes (2015) term 'residual realist' understandings of the public and of participation, dominant approaches to societal engagement BUILDING RESEARCH & INFORMATION 2016 Vol. 44, No. 7, 804-815, http://dx.doi.org/10.1080/09613218.2016 # Gansmo, 2012;Ivner et al., 2010; and Sheppard et al., 2011). Consequently, there are few opportunities for residents of neighbourhoods to engage with the future of the energy system on their own terms to influence it according to locally held values and visions of the good life.This paper presents a case study of a transdisciplinary research project called Solar Energy in Future Societies (SEFS) that sought to disrupt the usual ways public participation in the shaping of future energy systems is performed. The project brought together an interdisciplinary group of academics and a self-assembling public at the town of Stocksbridge, in the Sheffield area o...