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This paper compares the historical development of innovation systems related to biogas and improved cooking stove technologies in Rwanda and Kenya by applying the 'functions approach'. It argues that the accumulation of functions in these four renewable energy technological innovation systems (TISs) differed substantially. We find that the accumulation of TIS functions at early stages of development is determined more by national and international contextual factors than by specificities related to technologies or internal dynamics (interaction of functions). Further examination of the functional patterns of TISs suggests that differences in the accumulation rates of functions explain the differences in diffusion rates, with broader and more balanced TIS functional accumulation being related to higher diffusion rates. The paper concludes that systematic support, including well-directed international development assistance, would enable the development of mature and balanced TISs that nurture the diffusion of renewable energy technologies. [ABSTRACT FROM AUTHOR]

Ensuring modern household energy services is a key focus for national governments of many developing countries and of international development agencies aiming to support sustainable development issues, especially in Sub-Saharan Africa. While renewable energy options are considered to have social and environmental benefits, and despite substantial efforts to support the dissemination of new and improved renewable energy technologies, rates of diffusion remain extremely low. For instance, biogas digester penetration in Rwanda accounts for just 1% of national potential as of 2012. This is in part due to the lack of innovation systems, which foster technology diffusion. This paper analyzes the development of a technological innovation system (TIS) for bio-digestion in Rwanda between 2000 and 2011. We apply the so-called ‘functions approach’ in analyzing the emergence of a Rwandan biogas technological innovation system. We show the accumulation through time of TIS functions, linking these to the weak diffusion of bio-digesters. We argue that international development assistance should aim to support to the build-up of technological innovation systems in their support for energy technologies. [ABSTRACT FROM AUTHOR]