Community energy and sustainable energy transitions in Ethiopia, Malawi, Mozambique  (CESET) The 2019 Energy Progress Report shows the need to step up efforts to link on-grid and off-grid strategies to facilitate access to electricity (EIA et al, 2019). According to the report, eight of the twenty countries with the largest deficits in access to electricity are in East Africa, including Ethiopia, Malawi, and Mozambique. In countries facing such significant gaps in energy access, the rapid adoption of renewable energy may help to deliver access to energy sustainably. The growing availability of renewable technologies in East Africa's countries suggests that such a transition is possible. However, technology alone will not solve the challenge of energy access.   A transition to sustainable energy needs to prioritise the social needs of excluded and disadvantaged groups. Responding to people's energy needs requires institutional, organisational, and financial models of energy delivery that prioritise social benefits over profits.   New models of energy delivery have been developed to involve communities in the design and management of off-grid systems. While the size and technologies used vary, all Community Energy Systems (henceforth CESs) incorporate the perspectives of beneficiaries on electricity generation and distribution through collaborative mechanisms for decision-making. CESs can provide additional capacity to existing grids, provide off-grid services where the grid is absent, and bridge on-grid and off-grid systems.   The project CESET brings together researchers from political science, human geography, engineering and technology providers to understand the role of CESs in advancing a just sustainable energy transition that will bridge the energy access gap in East Africa.   Our focus is in Ethiopia, Malawi, and Mozambique, three countries where there is considerable local enthusiasm about CESs. Proponents of CESs argue that they can foster deep structural transformations in countries facing large electricity deficits. First, by giving ownership to communities, CESs challenge the political economy of energy and reveal energy-related inequalities. Second, by demonstrating new modes of service provision, CESs can diversify the institutional landscape of energy delivery. Third, by incorporating the concerns of the more disadvantaged populations in the design and management of energy services, CESs can respond to their needs directly and generate innovations tailored to those needs.  There is little evidence of how CESs work in practice and their impacts in East Africa because of the shortage of data on CESs, and energy systems more generally. There is a need to renew policy and practice. Research and interventions often rely on technological blueprints that do not fit the institutional and material conditions in which CESs operate. Moreover, conceptualisations of communities as harmonious, homogenous units obscure the multiple forms of exclusion that influence energy access and infrastructure management. There is already an international consensus about the need for disaggregated data to understand the gender gap in energy access. CESET advocates going beyond by considering the intersection of gender with multiple social characteristics that may also lead to exclusion from energy services (such as age, sexual orientation, ethnicity, place of origin).   CESET will produce three outcomes to address this challenge. CESET's theoretical framework will recognise the variety of CESs models and how they interact with multiple variables of community diversity. CESET will also characterise the landscape of operation of CESs in East Africa at three scales: local, national, and regional. Further learning will happen with the activation of a Community Energy Lab in Mozambique to compile evidence of what works in practice. CESET's efforts will lead to the creation of a Regional Energy Learning Alliance to deliver a long-term research programme and support trans-sectorial learning on CESs in East Africa. COVID-19 The Global Challenges Research Fund (GCRF) supports cutting-edge research to address challenges faced by developing countries. The fund addresses the UN sustainable development goals. It aims to maximise the impact of research and innovation to improve lives and opportunity in the developing world.