Combining policy making tools for green transition: eco-efficiency benchmarking and club convergence

This study examines the eco-efficiency performance of green energy transitions in 45 high-emission countries (1995–2022), focusing on convergence in policymaking. Using hybrid window data envelopment analysis (WDEA) models, eco-efficiency was evaluated for non-renewable energy (NRES), renewable energy (RES), and mixed sources. Inputs included capital, labor, and electricity generation; outputs were GDP (desirable) and CO2 and CH4 emissions (undesirable). Efficiency averaged 76.04% (RES), 74.25% (NRES), and 73.61% (mixed). Conditional convergence analysis revealed countries with similar conditions converge to unique steady states, highlighting the need for harmonized energy standards, therefore investments in green technologies can reduce emissions and electricity generation costs.