Вот тебе кстати ликбез про ПОЛЕЗНОСТь гидроелектростанций ДЛЯ ОКРУЖАЮЩЕЙ СРЕДЫ

Hydropower is a key source for renewable electricity
generation and has an important potential to be marketed
as green power. While offering ecological advantages
from a global perspective, such as climate
change mitigation, emergency management and reduction
of fl ooding risk, the construction and operation
of hydropower plants may cause some environmental
impacts on the local and regional level. These
include harm to fi sh populations, a loss of aquatic
habitat, a signifi cant change in natural fl ow regimes
and deterioration of the landscape. The following table
lists the main positive and negative impacts of
hydropower. As a result, a contrast between two different
but well-grounded environmental goals seems
apparently insoluble: green-house effect reduction,
on the one hand, and water habitat protection, on
the other. This is a very weak point that has important
consequences from a regulative point of view,
as refl ected in the contradictions between the objectives
and targets set by two key European Directives:
WFD (Water Framework Directive) and RES-e (Renewable
Energy Sources electricity Directive). Nevertheless,
there are different solutions that can reduce
these contrasts and promote, as a consequence, the
achievement of a higher environmental quality.

http://www.esha.be/fileadmin/esha_files/documents/SHERPA/Annex_XII_Environmental_Report.pdf