Of course, the same Soviets copied the American capitalists's hydro policy, starting with Stalin and continuing with Khrushchev, with the same negative environmental effects. The Volga Hydroelectric Station project [2] was used as an accusation against Khrushchev by some and said accusation was used for its dismissal, supposedly for the project's negative effects, mainly the huge swathes of very productive agricultural lands which got submerged.
Modern-day Egypt has done the same thing with the Aswan Dam.
[1] https://en.wikipedia.org/wiki/Northern_river_reversal
[2] https://en.wikipedia.org/wiki/Volga_Hydroelectric_Station
What is wrong with it? It definitely caused damage, but also partially displaced more polluting energy sources, partially increased available energy.
Are you sure that overall balance is so dismal?
https://www.cbsnews.com/news/lake-mead-water-level-historic-...
https://mead.uslakes.info/level.asp
The Hoover Dam is at half production,
https://www.cnn.com/2022/08/16/us/hoover-dam-hydropower-drou...
The system is failing.
Now it is a paradise of sorts, but the foundation is unsound.