ChinaCoal Pingshuo 600,000 kW Off-Grid Hydrogen Production Project Tops Out Its Plant: China's First PV Off-Grid Hydrogen Production Integrated with Coal Chemical Demonstration

Recently, the water electrolysis hydrogen production unit of the China Coal Pingshuo coal mining subsidence area 600,000 kW off-grid renewable energy hydrogen production Phase I project, constructed by China Chemical Engineering Second Construction Corporation, completed main structure capping. This milestone removed a major obstacle in the project's main line construction. As China's first large-scale demonstration vehicle deeply integrating PV off-grid hydrogen production with coal chemical industry, the capping of the unit means the carbon reduction route of "green electricity—green hydrogen—green chemicals" is gradually moving from blueprint to on-site verification.

Reinforced concrete structure, maximum gable erection height of 15.8 m

The main structure of this unit adopts reinforced concrete construction, divided into two major functional areas: frame and bent. On-site formwork heights in some sections exceed 8 m, with the maximum gable erection height reaching 15.8 m, making it a divisional and sub-divisional project with relatively high risk and very little room for construction error.

The project department front-loaded safety and quality control before construction began, with all construction activities strictly following the special plan approved by expert review. During construction, on-site inspections were continuously intensified, with focused monitoring of key processes such as frame erection, fastener tightening, and concrete pouring pace, while dynamic monitoring of formwork support and frame systems was carried out simultaneously, with immediate rectification upon discovery of any hazards. In response to adverse conditions at the project site such as strong wind disturbance, high loads, and vibration interference, the team conducted risk simulations in advance and formulated corresponding response plans, ensuring qualified conditions for subsequent equipment mobilization and installation.

Off-grid operation mode, electrolyzers directly absorb wind and solar power fluctuations

The project site is located in a coal mining subsidence area in Shuozhou, Shanxi, and the overall technical route adopted is "PV power generation—water electrolysis hydrogen production—ammonia synthesis." Subsided mining land is used to lay PV modules, and the electricity generated is directly supplied to electrolyzers to produce green hydrogen. The green hydrogen produced is fed into the ammonia synthesis unit, replacing gray hydrogen produced by traditional processes relying on coal and natural gas.

Conventional hydrogen production routes in the coal chemical industry have relatively high carbon emission levels, with approximately 10 to 12 kg of CO2 emissions per 1 kg of hydrogen produced, while carbon emissions from green hydrogen production are close to zero. The project adopts an off-grid operation mode, where wind and solar output is inherently volatile. This solution chooses to have electrolyzers and downstream chemical units directly absorb the fluctuations, without the need for large-capacity energy storage facilities, providing a cost-controllable new approach for local consumption of new energy. At the same time, the ecologically damaged coal mining subsidence land regains industrial value through PV development, delivering dual benefits of ecological restoration and energy development.

Total investment of 29.78 billion yuan, annual carbon reduction of approximately 2.8 million mt

Behind the project is the larger China Coal Pingshuo coal-based olefin integrated layout. This project has a total investment of approximately 29.78 billion yuan, and is also the largest single coal chemical project by investment scale in Shanxi Province. The project is planned to use high-sulfur, high-ash fusion temperature coal as raw material, coupled with green electricity, green hydrogen, and CO2 resource utilization measures, to build a 2.2 million mt/year methanol unit, further converting into 1 million mt of olefin new materials, with products extending downstream to polyethylene, polypropylene, degradable plastics, and other categories. After the project is fully operational, it is expected to reduce CO2 emissions by approximately 2.8 million mt per year, drive upstream and downstream industrial clustering, and boost local employment.

This water electrolysis hydrogen production unit is precisely the opening move in the entire low-carbon blueprint for olefins. Its operational performance directly determines the feasibility of commercial promotion of green hydrogen in large-scale coal chemical scenarios, and also determines the expansion space for subsequent similar projects under carbon emission constraints. The industry is widely watching the long-term operational data of this demonstration project. Unlike grid-connected hydrogen production projects, the off-grid mode coupled with long-term continuous chemical production creates more complex operating conditions. If the project can consistently achieve stable economic viability, it will provide a clear transformation path for energy bases in Shanxi, Shaanxi, and Inner Mongolia, which are rich in coal and abundant in wind and solar resources.