The irreversible effects of climate change have led to a significant increase in citizen-led and initiated local energy cooperatives. Playing a crucial role in the shift to renewable energy, these cooperatives are evolving from informal community groups to structured organisations. Their success relies on co-creation, a collaborative process in which stakeholders and citizens join forces to improve efficient decision-making, build trust and promote shared responsibility. This leads to creating effective solutions and achieving collective goals across projects and sectors. This thesis examines the role of co-creation in local energy cooperatives and highlights its importance in promoting sustainable energy practices and empowering citizens. It focuses on investigating co-creation within the energy cooperatives of the Metropolitan Region Rotterdam The Hague (MRDH) and connects theoretical concepts with practical applications in energy transition. The central research question is: ”In what ways does co-creation manifest within local energy cooperatives in the Metropolitan Region Rotterdam The Hague?” A literature review was conducted using the PRISMA method and snowball technique to understand the academic perspectives of co-creation, especially in energy transition. This helped identify the scope of the thesis and gaps in current academic knowledge. The thesis contains two theoretical frameworks. The first, from Puerari et al. (2018), examines the dynamics of co-creation in local communities and identifies five key elements: intended purpose, process type, ownership, motivations and incentives, and spaces and places. This research applied these elements to understand co-creation in MRDH’s local energy cooperatives through qualitative case study analysis. The analysis reveals the cooperatives’ commitment to fossil-free energy and their encouragement of citizen participation through a mix of formal and informal methods, addressing different motivations and adopting a shared ownership model to promote community involvement. The second framework consists of six criteria that define co-creation activities. These criteria are developed in this study, and derived from academic literature. These criteria include shared goals, active participation, equality and inclusiveness, iterative processes, value creation and mutual learning. Subsequently, the study used these criteria to evaluate the activities of energy cooperatives and assess their alignment with the concept of co-creation. Through interviews and observations, four key cooperative activities were identified: advisory services, information generation, renewable energy production and stakeholder engagement. While these activities meet the criteria for co-creation, there are opportunities for improvement in almost all areas of co-creation to fully realise the potential of these activities. The findings suggest that cooperatives should organise regular stakeholder discussions, introduce paid functions, make more effective use of physical spaces, promote diversity and develop digital platforms for knowledge sharing. Policymakers can support these cooperatives by recognising their contributions, encouraging professional development and encouraging flexibility and innovation. Future research recommendations address the limitations of this study such as regional focus, time constraints and possible subjectivity of the qualitative method. Suggestions include expanding the geographical scope, involving a wider range of stakeholders, using mixed methods and testing the recommended strategies in different contexts. In summary, this research is an important step in understanding co-creation manifestation within local energy cooperatives. It suggests strategies through which these cooperatives, in collaboration with policymakers, can effectively contribute to environmental sustainability and climate change mitigation.