Empirical Analysis of Energy Efficiency Drivers in Nigerian Cement Manufacturing Plants

This study empirically analyses the determinants of energy efficiency performance across Nigerian cement manufacturing plants, contributing to the limited empirical evidence base on industrial energy management in the Nigerian context. Cement manufacturing is Nigeria's most energy-intensive manufacturing sector, and improving energy efficiency represents a critical pathway to both cost reduction and greenhouse gas emission mitigation at a time of escalating energy costs and emerging carbon reporting obligations. This research applies a stochastic frontier analysis approach to model energy efficiency using a panel dataset compiled from energy audit reports, production records, and financial data covering eight cement plants across the South West, North West, and South South zones over a five-year period. Energy efficiency scores are estimated for each plant-year observation, and a second-stage regression analysis examines plant-level and operational variables as efficiency determinants. Results reveal substantial inter-plant variation in energy efficiency, ranging from sixty-two to eighty-eight percent of the efficiency frontier, with newer plants, higher clinker-to-cement ratios, and plants with implemented ISO 50001 energy management systems exhibiting significantly higher efficiency scores. Recommendations advocate for mandatory energy management system certification for all large-scale cement producers and the establishment of a sectoral energy efficiency benchmarking programme coordinated by the Energy Commission of Nigeria. Keywords: energy efficiency, cement manufacturing, stochastic frontier analysis, ISO 50001, Nigeria