Off-grid communities in Tanzania face challenges in accessing reliable energy sources, necessitating innovative solutions. A mixed-methods approach combining quantitative DiD analysis with qualitative interviews to assess system adaptability, user satisfaction, and socio-economic impacts in selected communities. The DiD model indicated an adoption rate of 35% for off-grid systems across the study area, with significant variation among different socioeconomic groups. Off-grid systems show promise but require tailored interventions to enhance adoption rates and sustainability. Develop community-led initiatives that address financial barriers and improve system reliability to support wider deployment of off-grid solutions in Tanzania. off-grid communities, energy access, adoption rate, Difference-in-Differences (DiD), mixed methods study The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.