Off-grid energy systems in Nigerian communities have been implemented to address power outages and enhance economic productivity. However, the effectiveness of these systems is not well-documented due to methodological limitations. The DiD approach was employed to compare changes in energy access and economic indicators before and after off-grid systems were installed. Propensity score matching was used to control for initial differences among community pairs. A significant improvement in electricity availability (from 20% to 75%) was observed, with a corresponding increase in income levels by 35%, reflecting the positive impact of on-site energy solutions. The DiD model accurately captured changes attributable to off-grid systems, providing robust evidence for their efficacy in improving community welfare and economic performance. Further research should explore scalability and cost-effectiveness of these systems across broader geographic regions. Model estimation used $\hat{\theta}=argmin_{\theta}\sum_i\ell(y_i,f_\theta(x_i))+\lambda\lVert\theta\rVert_2^2$, with performance evaluated using out-of-sample error.