"background": "The expansion and modernisation of power-distribution networks in sub-Saharan Africa are critical for economic development. However, systematic, longitudinal analyses of equipment adoption, crucial for infrastructure planning and investment, remain scarce. Existing studies often rely on cross-sectional data, which fail to capture dynamic adoption processes and their drivers. ", "purpose and objectives": "This study conducts a methodological evaluation of approaches for analysing power-equipment adoption. Its primary objective is to develop and apply a panel-data estimation model to measure and forecast adoption rates of key distribution assets, specifically transformers and switchgear, within a national grid system. ", "methodology": "A comparative study was undertaken, utilising a novel longitudinal dataset of utility procurement and deployment records. The core analytical framework is a fixed-effects panel model: y{it = \ + \ Xit + \ +, where yit is the adoption rate in region i at time t. Robust standard errors were clustered at the regional level to account for serial correlation. ", "findings": "The panel-data approach demonstrated superior explanatory power compared to static models. Estimation revealed a strong positive association between regional urbanisation growth and transformer adoption rates, with a coefficient of 0. 85 (95% CI: 0. 72, 0. 98). A key theme was the significant heterogeneity in adoption trajectories across regions, not explained by aggregate national indicators. ", "conclusion": "The methodological evaluation confirms that panel-data techniques are essential for accurately modelling the dynamics of infrastructure adoption. The findings underscore that adoption is not uniform and is closely linked to localised socio-economic development patterns. ", "recommendations": "Infrastructure planning authorities should employ panel-data methodologies for forecasting and resource allocation. Policy should target support mechanisms for regions with lagging adoption rates to ensure equitable grid development. Future research should integrate granular data on financing and technical capacity. ", "key words": "Infrastructure planning, panel data, fixed-effects model, grid modernisation
Nalwoga et al. (2023) studied this question.