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Energy consumption in buildings is a large contributor to global carbon dioxide emissions. Renovations of existing buildings can reduce their impact by integrating technologies which increase efficiency or generate renewable energy on-site. Doing this well and at scale is a collective action problem, which transcends the agency of individual entrepreneurs. This article reports a cross-case comparison of four previous studies focused on low-energy renovation of housing, using a co-evolutionary framework in which five systems are mutually interdependent: ecosystems, technologies, user practices, business strategies and institutions. Innovations across the five systems are described in terms of variations, selection pressures and transmission. The analysis draws out common themes from the four previous studies and to reflect on how well the co-evolutionary framework accounts for innovation in the particular field of housing renovation for low-energy outcomes. Business strategies emerge as an important (and often neglected) source of innovation. The framework generally accounts for innovation in this area quite well, although two important issues are a less easy fit: The use of energy (and other finite resources) is rather indirectly accounted for by the term ‘ecosystems’ and the complexity of interactions between multiple users, businesses and technologies is partly elided.

With nearly one-third of the UK’s total consumption of energy devoted to the domestic household sector, sustainable housing developments have an important part to play in reducing greenhouse gas emissions in order to combat climate change. This study analyses a sustainable housing development in the city of Nottingham in the United Kingdom that takes the form not merely of a sustainable housing project, but rather an experiment in developing sustainable communities. In terms of green or eco-innovation, it incorporates innovations in housing design geared to curbing the demand for energy; technological innovations in energy supply centred on a novel community energy system; and innovations in the governance models employed. The scheme is notable for the novel public–private partnership carrying out the development, which specializes in developments characterized by an emphasis on quality urban design and a strong commitment to environmental sustainability.

Traffic congestion at peak times has long been a problem facing cities in the United Kingdom.1Latterly concern about combating congestion has been hightened by worries over carbon emissions and poor air quality. In tackling these problems, green innovations incorporating new technologies appear to have much to offer, although progress in implementing these sorts of innovation appears to have been slow. This case study analyses the efforts of one city to tackle these problems by pioneering a number of green innovations including the introduction of a light rail system employing trams known as Nottingham Express Transit as well as electric and gas-powered buses. The nature of these innovations is explored together with a detailed examination of how they came to be implemented and the impact they have had.

Electrification of the car is an inevitable trajectory; only battery electric vehicles (EVs) give the option – provided a zero carbon generating mix is developed – of ultimately zero carbon and zero emissions transport. Yet this means disruptive change to the existing automotive and energy business models covering all sections of the value chain, which provides entry points for new, entrepreneurial operators from outside the sector bringing with them new business models. We are entering a transition period, where some of these alternative business models are already seen to work and those of Autolib and Tesla are highlighted here. New electric vehicle (EV) business models need to extend beyond the boundaries of the business itself and should also include a consideration of context and environment, or ‘regime’ (Geels, 2002), particularly in the role of government. It should be emphasized that EV business models are dynamic, still emerging and are currently enjoying artificial market conditions due to widespread incentives. Private and public sector players are still exploring what their respective roles should be in future EV business models.

Product service systems (PSS) may usefully form part of the mix of innovations necessary to move society towards more sustainable futures. However, despite such potential, PSS implementation is highly uneven and limited. Drawing on an alternate sociotechnical perspective of innovation, this article provides fresh insights on, among other things, the role of context in PSS innovation, to address this issue. Case study research is presented focusing on a use-orientated PSS in an urban environment: the Copenhagen city bike scheme. The article shows that PSS innovation is a situated complex process, shaped by actors and knowledge from other locales. It argues that further research is needed to investigate how actors’ interests shape PSS innovation. It recommends that institutional spaces should be provided in governance landscapes associated with urban environments to enable legitimate PSS concepts to co-evolve in light of locally articulated sustainability principles and priorities.