“…In the policy evaluation of the NICPP, a typical innovation policy, many studies have focused on the impact of the policy on environmental, energy, and innovation factors [10,37,38]. The most similar studies to this paper focused on the impact of NICPP on energy efficiency, energy productivity, and eco-efficiency: Li et al (2021) [39] used the SBM-DEA method to measure ecological efficiency and concluded that NICPP can positively affect urban eco-efficiency through technological innovation, industrial restructuring, and direct government intervention effects; Yu et al (2022) [6], using the stochastic frontier analysis (SFA) method to construct an energy productivity index, concluded that NICPP can improve energy productivity by enhancing innovation quality, R&D expenditure, and innovation behavior; and Yang et al (2022) [9] conducted a study using single-factor energy efficiency and concluded that NICPP improves energy efficiency directly or indirectly by establishing evaluation indicators, optimizing industrial structure, and promoting the level of urban innovation, but did not consider the inclusion of non-desired outputs, which would result in a large deviation from the reality.…”