The Influence of New Energy Industry Agglomeration on Regional Green Innovation Performance—Evidence from China

The advance of the new energy industry and the promotion of green innovation are both important ways to solve environmental pollution and achieve economic green transformation, and there may be a non-negligible intrinsic connection between the two. Utilizing panel data covering the period from 2011 to 2021, encompassing 30 provinces and cities in China, this study measures agglomeration levels of the new energy sector and green innovation performance in each region. Via the application of the fixed-effect model and spatial Durbin model, this study empirically examines the impact mechanism of green innovation performance resulting from the agglomeration of the new energy industry. This investigation discloses that there is regional heterogeneity in China’s new energy industry agglomeration level, with the highest level observed in the western region. The distribution of green innovation performance forms an “East–Middle–West” ladder pattern, with both the central and western regions falling below the national average. Agglomeration of the new energy sector exerts a non-linear, “U-shaped” influence on green innovation performance, demonstrating conspicuous regional heterogeneity; opening up positively moderates the “positive U-shaped” correlation between new energy agglomeration and green innovation performance. A clear spatial spillover effect characterizes the agglomeration of the new energy industry, demonstrating a non-linear “inverted U-shaped” influence on the green innovation performance of surrounding regions. This paper aims to offer policy insights into the establishment of developmental layouts for the new energy industry in China while simultaneously providing practical references for enhancing regional green innovation performance.