In Nigeria, power distribution systems are often unreliable due to inadequate maintenance and infrastructure issues. A quasi-experimental design will be employed to assess system performance under varying conditions without random assignment. Significant variance (p < 0.05) was observed in system uptime across different regions, indicating regional disparities in reliability. The findings suggest that targeted interventions are needed to enhance the reliability of power distribution systems in Nigeria. Investment should be prioritised in maintenance and infrastructure upgrades to improve system performance. Power Distribution Systems, Quasi-Experimental Design, Reliability Assessment, Nigeria The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.