DPV systems, typically small to medium-sized solar power installations on buildings, which primarily and directly supply electricity to industrial, commercial, or residential consumers in proximity. DPV is an advocated renewable substation for climate change and energy saving for merits of low installation costs, high energy efficiency, and the ability to provide decentralized power supply. Our research has theoretical significance in explaining and understanding the development and policy evolution of DPV in China and provide valuable suggestions for future industry policies during grid parity.

Since 2021, China has been phasing out its decade-long feed-in tariff policies, reducing the photovoltaic industry's dependency on subsidies. Despite the challenges posed by declining electricity prices and slowdown in economic growth, the authorities continue to prioritize the development of DPV due to its low investment costs, high energy efficiency, and decentralized power supply, and these technologies have already achieved demand-side parity. Driven by this phenomenon, this study examines the trajectory of DPV diffusion and the evolution of related policies over the last decade. It unravels the dynamic mechanism of DPV investment through theoretical analysis and develops a macro model to identify optimal installation strategies and renewable energy proportions. Our findings highlight the increasing role of green energy and suggest that green finance is crucial for stimulating DPV investment in the era of grid parity. The study concludes with practical recommendations for overcoming DPV challenges in China.

DPV has become a prominent renewable energy solution in other countries but not in China. We probe the system dynamics modeling to give explanation and solution during grid parity.

China formally pledged to peak its carbon emissions within 10 years and achieve carbon neutrality within 30 years thereafter. Considering the numerous challenges and difficulties ahead, it is essential for China to strengthen the building of climate governance systems toward carbon neutrality. This paper examines the interactions between elements of China's climate governance system, and develops a theoretical framework for China's climate governance toward carbon neutrality, with a view to providing more comprehensive information for decision-making.

China's high ambitions to peak carbon emissions by 2030 and to achieve carbon neutrality by 2060 make climate governance an urgent issue. Against this background, this paper develops a TAM (‘Target, Actor, Mechanism’) theoretical framework for China's climate governance toward carbon neutrality, intending to provide information for decision-making. This framework, centering on governance actors, is based on two key assumptions: First, the stance of each actor toward a climate action depends on the impact of this action on the actor's objectives and the weight of these objectives to this actor; Second, the most feasible governance mechanism is the solution that can best satisfy actors' objective with the greatest decision-making influence. Applying this framework in case studies involves three major steps: (1) Identifying China's climate governance actions according to transition pathways toward carbon neutrality; (2) Assessing the effects of climate actions on the objective of relevant actors; (3) Obtaining feasible governance mechanisms based on historical institutionalism analysis. By linking different climate governance research methodologies, this theoretical framework can provide decision-makers with more comprehensive information on climate governance.

Integrating quantitative models with institutionalism can bridge the gap between policy formulation and implementation.

To address the issues of declining groundwater levels and the degradation of soil ecological functions caused by open-pit coal mining in China. Based on theoretical analysis, laboratory experiments, on-site monitoring, mathematical modeling, and other means, the concept of coal ecological protection mining of ‘damage reduction mining, three-dimensional protection, systematic restoration’ is proposed. The mining concept has achieved remarkable ecological restoration effects, leading the scientific and technological progress of safe, efficient and green mining in open-pit coal mines.

The mechanism of damage propagation among ‘rock-soil-water’ ecological elements in open-pit coal mining was revealed. Adopting comprehensive damage-reducing mining technology throughout the entire stripping process, mining and drainage, shengli open-pit coal mine has doubled its production capacity, and reduced the land excavation and damage by 60 mu/year, reduced the mining area by 1,128 mu, and raised the groundwater level by 2.6–6 m, and the ecological restoration of the drainage field was advanced by more than 1 year. Adopting the three-dimensional water storage technology involves underground reservoirs, aquifer reconstruction, and near-surface distributed water storage units, baorixile open-pit mine has built the world's first open-pit underground water reservoir, with a water storage capacity of 1.22 million m3, and the speed of groundwater level restoration has been increased by more than 70%. By adopting the systematic restoration technology of geomorphology-soil-vegetation in the discharge site, the soil water content in the demonstration area has been increased by 52%, the survival rate of plants has been increased by 34%, and the vegetation coverage has been increased by more than 40%.

Damage-reducing mining and systematic ecological restoration in open-pit coal mining are essential for the safe, efficient and green development of coal.