Energy activities, especially the power industry, are the main source of carbon emissions in China. With the high proportion of renewable energy connected to the power grid, the fluctuation of its output poses a serious challenge to the safe and stable operation of the power system. Developing efficient and flexible renewable energy conversion and storage technologies has become a key path to achieving the “dual carbon” goal. This article proposes a new concept of low-carbon source grid load storage power system based on electric hydrogen coupling, highlighting the strategic value of green hydrogen as the core clean energy carrier. Green hydrogen can absorb surplus wind and solar power during low electricity consumption periods to produce and store it. During peak periods, fuel cells can be used for peak shaving, and it has the ability to store energy for a long time and across seasons. It is an ideal medium for achieving multi energy complementarity between electricity, hydrogen, and gas. A regional level electric hydrogen coupling system architecture has been constructed, covering two major subsystems of electric energy and hydrogen energy. The focus is on the coordinated production of “electric hydrogen” on the power supply side, the integration of “electric hydrogen storage” on the energy storage side, the linkage of “power transmission hydrogen transmission” on the grid side, and the diverse hydrogen usage scenarios on the load side, fully demonstrating its potential applications in fields such as construction and transportation. To provide a feasible path for China’s low-carbon energy transformation and contribute Chinese solutions to global carbon neutrality.