1. Due to the terrain limitation, it is impossible to build a large capacity. The single machine capacity is about 300MW.
2. The construction period is long and the construction cost is high.
3. Being located in natural rivers or lakes and swamps, it is vulnerable to geomantic disasters and affects other water conservancy undertakings. Power output is easily affected by weather, drought and rain.
It is not easy to increase the production capacity after the factory is completed.
5. Ecological destruction: the water erosion under the dam is intensified, the river changes and its influence on animals and plants.