Water dams are not good for the eco system down stream. My country has close to 99% green electricity but a lot is from water power. Water power is not that gre

Water dams are not good for the eco system down stream. My country has close to 99% green electricity but a lot is from water power. Water power is not that green because the dams prevents the eco system down stream to function normally. Also fish can not reproduce because they need to be able to climb up and down the river which has dams which blocks movement. Further the 99% green electricity is causing a lot of big clouds data centers to be located here. But the clouds run on water power.