Abstract: The development of green power is an important measure to save energy, reduce emissions, improve quality and increase efficiency in the power industry. It is also a strategic direction for China to achieve its goal of carbon neutrality and promote green economic and social transformation and development. Based on spatial panel data from 30 provinces between 2010 and 2021, this paper constructs a spatial Dobbin model to analyze the relationship between green power and carbon emission efficiency. The study introduces green technological innovation as an intermediary variable to explore the mechanism of green power on carbon emission efficiency. The study indicates that: (1) From the national perspective, green power can significantly improve carbon emission efficiency; (2) From the national perspective, green power has a positive spatial spillover effect on carbon emission efficiency; (3) From the national perspective, green power can improve carbon emission efficiency by promoting green technology innovation. (4) From the perspective of regional distribution, the impact of green power on carbon emission efficiency is regionally heterogeneous, with an inhibitory effect in the eastern region and a promotional effect in the central and western regions.