The evolving policy network in sustainable transitions: The case of new energy vehicle niche in China

Policy has been the driving force behind the rapid development of China's new energy vehicle (NEV) industry. However, the policy network that supports NEV development has been underexplored. This paper explores NEV as an innovative niche for sustainable transition and investigates the evolutionary mechanism of its policy network by combining insights from policy network, strategic niche management and technology innovation system (TIS) theories. Operationally, this paper adopted a social network analysis method to study the NEV policy network in various niche development stages consisting of 377 NEV policy documents formulated by government agencies between 2000 and 2021. Results show the NEV policy network evolves towards bigger, newer actors and is more heterogeneous in creating joint efforts in policymaking that promotes niche development and facilitates a transition to a market niche. Specifically, the policy network expands continually, and network density reaches the maximum of 0.635 at the end of the technological niche. Six agencies are identified as dominators in NEV policymaking. Collaboration on NEV policymaking exhibits obvious organisational heterogeneity, especially in the market niche with an E-I value of 0.576. This study enhances understanding of the evolutionary patterns of policy network and its function on supporting TIS development for immaturely sustainable technologies. The findings also provide important insights into the NEV policymaking process.