What are the disadvantages of hydroelectric energy? disrupts habitatsfloodinglack of sitespolitical conflictmay produce hazardous materialssites may stop producing energy?

Disadvantages:
- Hydroelectric plants are very expensive to build, and must be built to a very high standard. 
-The creation of dams can also create flooding of land, which means natural envrionment and the natural habitat of animals, and even people, may be destroyed.
-The building of dams for hydroelectric power can also cause a lot of water access problems.