China Yangtze Power Co., Ltd.

China Yangtze Power controls the Three Gorges Dam cascade on the Yangtze River, where releasing water through the turbines to generate electricity is the same physical act that sets the water level for downstream navigation locks and absorbs flood pulses from the upper basin — so power generation, lock scheduling, and flood management cannot be run by separate operators without rebuilding the river's entire transportation infrastructure. Because those three functions are legally bundled into a single reservoir operating permit granted by Chinese water authorities, no competitor can simply acquire the dam's role; the permit, the dam geometry, and the State Grid transmission network — which was sized specifically around Three Gorges output — evolved together and are mutually locked. The hard ceiling on everything, though, is the volume of water the Yangtze delivers each season: in dry seasons, river flow falls short of what is needed to run all turbines at full capacity, and in flood seasons, water must be released on the reservoir's safety schedule rather than when electricity demand is highest, so generation peaks and demand peaks routinely miss each other. If water authorities ever separated the flood-control obligations from the power-generation rights — say, under new Yangtze environmental protection rules tied to fish migration — the integrated release logic that makes the cascade work would come apart, because the dam was built to satisfy all three constraints at once, not each one independently.