For a successful transition to a sustainable energy system, not only technical but also social innovations are required. A major challenge to social innovation research is how to translate the social innovation from a novelty with big potential into a mainstream practice. The multilevel perspective (MLP) of socio-technical transitions provides a heuristic to understand how niches can potentially break through to the regime level. In this paper, we examine in how far a multilevel perspective approach is suited to analyze and better understand diffusion trajectories of social rather than technological innovations, taking a social practice theory perspective. Five example projects, selected among the top social innovations for the Energiewende in North Rhine-Westphalia, are analyzed. We discuss to what extend the MLP provides a helpful tool to understand the transition processes. Social innovations can be very divers. We find that the MLP does not offer a one-size-fits-all framework for the analysis of the diffusion of social innovations. The MLP proves applicable only in those cases where the social innovation (1) can lead to a system change and (2) has a clear competing or symbiotic relationship with an existing regime. Social innovations that aim to be transformative in the sense that they have the goal to be system changing (rather than incremental) can be analyzed along the heuristics of the MLP. For this type of social innovation, the MLP can be fruitful to learn to better understand the diffusion dynamics of social innovation and the barriers and drivers they might face. However, for social innovations that aim at incremental improvements without challenging the existing system, the MLP cannot be applied to study the diffusion process.

Transformative research requires transdisciplinary collaboration, forcing researchers out of their disciplinary comfort zones. In transdisciplinary research projects, the role of (social) scientists changes, and non-scientific actors become part of research projects. Transdisciplinary research is particularly suited to not only generate scientific knowledge, but also invent real-world solutions and to innovative. This, however, does not come without challenges. Implementing a transdisciplinary project is time-consuming and requires the alignment of both the research and impact ambitions of all project partners. In this paper we build upon experiences gained in four transdisciplinary research projects and ask: (1) What is the transdisciplinary approach followed by the project? (2) Which opportunities and challenges can be identified for successful transdisciplinary collaborations? (3) What is the rationale for engaging in transdisciplinary research from the perspective of social scientists? Building upon the logics of interdisciplinary, a fourth logic, called the logic of empowerment, is identified as a driver for transdisciplinary research. Transdisciplinary collaboration empowers researchers to not only ‘discover’ innovations, i.e., to invent, but also to implement, i.e., to innovate.

It is generally well-accepted in innovation research that consumer/user adoption of an invention is key to its diffusion. Despite general awareness about the importance of the adopter perspective in innovation diffusion, the majority of the literature on social innovation, hardly addresses the adoption-side of innovation diffusion. Social innovation potential therefore often remains under-utilized. In this paper the result of a review of 468 (predominantly English language) publications on social innovation is provided (based on Web of Science), searching for the adopter perspective in social innovation research. The findings show that, although some hints at the role of adopters, and their environment, can be found in the literature, attention for the willingness and capacities of potential adopters is meager in peer-reviewed publications. Propelled by high policy expectations, at the national as well as European level, scientific interest in social innovation has been booming over the last decade. Without a proper understanding of social innovation diffusion dynamics and adopter willingness and their interactions with existing institutions, expectations may not be fulfilled and specific social innovation policies that have been emerging across Europe may not be able to achieve intended policy goals.

The relationship between energy and capital is one of the most important aspects of modern economic growth. Machines need energy to produce all the goods we enjoy; energy would be far less useful for humankind in absence of machines. However, the great majority of the economic models do not take into account the elasticities of substitution (or complementaries) between these two main variables. Actually, energy is absent in many growth models and discussions on diverging economic development paths. We approach this relevant issue from a new perspective: energy and capital relations during 100 years. We use the latest estimations of capital stock (machinery and equipment) and energy consumption for Latin America and compare them with those of Western Europe. The energy–capital ratio (how much energy is used per unit of capital) could be a predictor of economic growth, thus providing stylised facts about the timing and causes of the different modernisation patterns of these regions and showing us some answers on the long-run relationship between energy consumption and capital accumulation.