Rwanda has seen an increasing adoption of off-grid energy solutions to support agricultural productivity, yet there is limited empirical evidence on their cost-effectiveness. A mixed-method approach combining surveys with field observations was employed. A t-test was used to compare yield differences between communities using different off-grid energy solutions. There is an observed trend towards higher crop yields (30%) among communities utilising solar-powered irrigation systems compared to those not adopting such technologies. The quasi-experimental design successfully identified cost-effective agricultural innovations in Rwanda, with a focus on solar-powered irrigation. Further research should be conducted to validate these findings and explore other off-grid energy solutions' impacts on agriculture. Quasi-experimental design, off-grid communities, cost-effectiveness, agricultural productivity, Rwanda The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.