To quantify the long-term impact of electric-hydrogen coupling on new-type power systems in promoting renewable energy consumption and low-carbon transition

this paper proposes a China multi-spatial and temporal planning model of electric-hydrogen coupling (China-MSTPEHC) model with scenario setting

configuration and operation optimization

and benefit evaluation. It integrates seven major power grid regions and combines the annual capacity configuration with hourly operation simulation. The key findings are as follows: 1) By 2060

China’s electrolysis capacity will form a spatial pattern of hydrogen production from onshore wind and solar in northern grid regions

hydropower in southwestern grid regions

and offshore wind in eastern grid regions. 2) Inter-regional hydrogen pipelines will be planned by 2030. By 2060，three main pipelines (“North China-East China”

“North China-Central China”

and “Northwest China-Southwest China”) will emerge

forming a spatial pattern of “west-to-east and north-to-south hydrogen transport”. 3) Electric-hydrogen coupling can increase renewable energy capacity

decrease thermal power capacity

and reduce total costs.