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<p>This study investigates the impact of energy infrastructure investment (EII) on urban green innovation (UGI), leveraging China’s Ultra-High Voltage Transmission Projects (UHVTP) as a quasi-natural experiment. Using panel data from 2006–2021 and a staggered difference-in-differences model, we find that UHVTP significantly enhances UGI by approximately 16.3%. Mechanism analyses reveal three driving forces: green and low-carbon transition, improved energy efficiency, and relaxed financial constraints. These effects are more pronounced in inland cities, resource-based areas, and regions with mature green finance systems. We also identify positive spatial spillovers on surrounding areas. Factually, policymakers are advised to prioritize UHVTP deployment in key innovation hubs and underdeveloped regions, while strengthening R&amp;D investment, green finance, and environmental awareness to foster an inclusive and resilient green transformation.</p>

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How energy infrastructure investment promotes urban green innovation: Evidence from China’s UHV transmission projects

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Quan Li,
  • Meiying Huang,
  • Shi Chen

摘要

This study investigates the impact of energy infrastructure investment (EII) on urban green innovation (UGI), leveraging China’s Ultra-High Voltage Transmission Projects (UHVTP) as a quasi-natural experiment. Using panel data from 2006–2021 and a staggered difference-in-differences model, we find that UHVTP significantly enhances UGI by approximately 16.3%. Mechanism analyses reveal three driving forces: green and low-carbon transition, improved energy efficiency, and relaxed financial constraints. These effects are more pronounced in inland cities, resource-based areas, and regions with mature green finance systems. We also identify positive spatial spillovers on surrounding areas. Factually, policymakers are advised to prioritize UHVTP deployment in key innovation hubs and underdeveloped regions, while strengthening R&D investment, green finance, and environmental awareness to foster an inclusive and resilient green transformation.