Question

disadvantages of hydroelecteic power

Answer 1

Disadvantages of Hydroelectric Energy


1. Environmental Consequences

The environmental consequences of hydropower are related to interventions in nature due to damming of water, changed water flow and the construction of roads and power lines.
Hydroelectric power plants may affect fish is a complex interaction between numerous physical and biological factors. More user interests related to exploitation of fish species, which helps that this is a field that many have strong opinions on.
Fish habitats are shaped by physical factors such as water level, water velocity and shelter opportunities and access to food. Draining would be completely devastating to the fish. Beyond this, the amount of water may have different effects on the fish in a river, depending on the type and stage of the lifecycle. Not all unregulated river systems are optimal in terms of fish production, because of large fluctuations in flow.
 

2. Expensive

Building power plants in general is expensive. Hydroelectric power plants are not an exception to this. On the other hand, these plants do not require a lot of workers and maintenance costs are usually low.
 

3. Droughts

Electricity generation and energy prices are directly related to how much water is available. A drought could potentially affect this.
 

4. Limited Reservoirs

We have already started using up suitable reservoirs for hydroelectric power plants. There are currently about 30 major power plants that are expected to generate more than 2.000 MW under construction. Only one of these projects was started in the last two years.

Answer 2

Disadvantages 
Fish populations can be impacted if fish cannot migrate upstream past impoundment 
dams to spawning grounds or if they cannot migrate downstream to the ocean. Upstream fish passage can be aided using fish ladders or elevators, or by trapping 
and hauling the fish upstream by truck. Downstream fish passage is aided by
diverting fish from turbine intakes using screens or racks or even underwater lights
and sounds, and by maintaining a minimum spill flow past the turbine.
Hydropower can impact water quality and flow. Hydropower plants can cause low 
dissolved oxygen levels in the water, a problem that is harmful to riparian
(riverbank) habitats and is addressed using various aeration techniques, which 
oxygenate the water. Maintaining minimum flows of water downstream of a 
hydropower installation is also critical for the survival of riparian habitats.
Hydropower plants can be impacted by drought. When water is not available, the 
hydropower plants can't produce electricity.
New hydropower facilities impact the local environment and may compete with other 
uses for the land. Those alternative uses may be more highly valued than electricity
generation. Humans, flora, and fauna may lose their natural habitat. Local culturesand historical sites may be impinged upon. Some older hydropower facilities may 
have historic value, so renovations of these facilities must also be sensitive to such
preservation concerns and to impacts on plant and animal life.


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