Off the coast of Rudong, Jiangsu, China has completed the world’s largest integrated solar-hydrogen-storage project. A 400 MW coastal solar farm, a 60 MW/120 MWh battery, and a green-hydrogen plant making 482 tons a year — all wired together, with a dedicated submarine cable feeding sunlight straight into the electrolyzer. This is the engineering breakdown of what was built, why it matters.
