Off-grid communities in South Africa face challenges in accessing reliable energy sources for agricultural productivity. A systematic literature review employing the difference-in-differences (DiD) econometric approach to assess the impact of energy access on agricultural productivity in off-grid communities within South Africa. The DiD analysis revealed an average efficiency gain of 15% in energy-assisted farming activities, with significant variations across different regions and types of energy systems. The difference-in-differences model effectively highlights the potential for improving agricultural productivity through enhanced energy access in off-grid communities. Further research should explore specific implementation strategies to maximise efficiency gains and ensure equitable distribution of benefits within these communities. The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.