Research methodology This case study was developed using data from secondary sources. The data was collected from the organization’s website, annual reports, press releases, published reports and documents available on the internet. Case overview/synopsis According to the International Energy Agency’s (IEA) World Energy Outlook (WEO), 775 million people worldwide would not have access to electricity even by 2022, with the majority of them living in sub-Saharan Africa (SSA) (Cozzi et al., 2022). In SSA, energy poverty had been a serious issue over the years. According to the IEA, 600 million people lacked access to electricity in 2019, while 900 million people cooked with traditional fuels (Cozzi et al., 2022). A World Bank report from 2018 said many SSA countries had energy access levels of less than 25% (Cozzi et al., 2022). Energy poverty in SSA hampered sustainable development and economic growth. Despite significant efforts to address this poverty, Africa remained the continent with the lowest energy density in the world. Although solar and other energy-saving products were appealing, their adoption rates were modest, and their distribution strategies were not particularly effective. The lack of electricity exacerbated a number of socioeconomic problems, as it increased the demand for and use of wood fuel, which caused serious health problems and environmental harm. While working in Uganda, Katherine Lucey (Lucey) saw that having no electricity had negatively affected women’s health in particular because it was women who were responsible for taking care of the home. These effects were both direct and indirect. The women’s reliance on potentially harmful fuels for cooking, such as firewood and charcoal, resulted in their suffering from respiratory and eye problems, in addition to other health issues. Furthermore, the distribution of energy-saving and renewable energy items was seen as the domain of men, and there was an inherent gender bias in energy decisions. Women were not encouraged to participate in energy decisions, despite the fact that they were the ones managing the home and would gain from doing so. In addition, because there was no light after dusk, people worked less efficiently. Lucey saw the economic and social difficulties that electricity poverty caused for women in rural Africa. She also witnessed how the lives of a few families and organizations changed after they started using solar products. This motivated her to start Solar Sister with the mission of achieving a sustainable, scalable impact model for expanding access to clean energy and creating economic opportunities for women. Solar Sister collaborated with local women and women-centric organizations to leverage the existing network. Women were trained, provided all the necessary support and encouraged to become Solar Sister Entrepreneurs and sell solar products in their communities and earn a commission on each sale. To provide clean energy at their customers’ doorstep, the Solar Sister Entrepreneurs received a “business in a bag” – a start-up kit containing inventory, training and marketing assistance. Solar Sister’s business model empowered the women in SSA by providing them with an entrepreneurship opportunity and financial independence. Also, the use of solar products helped them shift from using hazardous conventional cooking fuels and lead a healthy life. The children in their households were able to study after sunset, and people in the community became more productive with access to clean energy. The COVID-19 pandemic outbreak, however, had a serious impact on Solar Sister. It found it challenging to mentor and encourage new business owners due to restrictions on travel and on group gatherings. The Solar Sisters were unable to do business outside the house either. Their source of income, which they relied on to support their families, was therefore impacted. The COVID-19 outbreak also slowed down the progress achieved by the community over the years and made household energy purchasing power worse. Furthermore, the organization was also grappling with other issues like limited access to capital, lack of awareness and infrastructural challenges. Another challenge lay in monitoring and evaluating the organization’s impact on the last mile. In the absence of standardized measurement tools and issues in determining the social impact of Solar Sister, it would be interesting to see what approach Lucey will take to measure the impact of Solar Sister on the society. What measurement tool/s will Lucey implement to gauge the social impact of Solar Sister? Complexity academic level This case is intended for use in PG/Executive-level programs as part of a course on Social Entrepreneurship and Sustainability.