Also negative aspects face the clean energy production by water power.

Even if the relation between the interference is more favorable compared with other hydro-electric power plants into nature due to the enormous quantity of the produced energy with Itaipú, its establishment caused irreparable damage to the environment.

Some thousand natives lost their homeland forever.

Altogether about 40,000 humans, mostly Guaraní Indian, had to be resettled.

For the establishment of the artificial lake large surfaces of subtropical rain forest were cleared out.

Still larger surfaces disappeared just in the tides, as well as the waterfalls Sete Quedas near Guaíra.

Those are almost even as those from Iguazú.

By the building it should have come to a mass dying of parrots.