This study investigates the impact of Green Innovation (GI) on energy efficiency performance across six emerging economies-China, India, Brazil, Turkey, Poland, and South Africa-using a comparative panel econometric approach. These countries represent diverse industrial structures, regulatory environments, and sustainability transitions. Panel data covering the period 2012-2023 are employed. Energy efficiency is measured by energy intensity and renewable energy productivity, while green innovation is proxied by environmental research and development expenditures and green patent activity. Digital readiness indices and GDP per capita are included as moderating and control variables. Fixed-effects and random-effects techniques are applied, with Hausman tests guiding estimator selection. The results show a statistically significant negative relationship between green innovation and energy intensity, implying that higher levels of innovation contribute to improved energy efficiency. Digital readiness further strengthens this relationship across the six-country sample. The findings provide policy-relevant insights for emerging economies seeking energy security and sustainability gains through technological modernization and innovation-led development strategies.