Increase pollution

Security risk is more

Requires more maintenance

Cannot be used for base load demand

Pollution effect is more

Requires high technology

Plant installation more complicated

Wind power is not constant and steady

Prevents water flow to other parts of dam

Converts potential energy into kinetic energy

Keeps the water flow from low to higher level

Converts kinetic energy into potential energy

More reliable

Low initial cost

Efficiency is high

Greenhouse effect is avoided

By storing water in high quantity

By using surge tanks at the water canal

By using water turbine to drive alternator

By creating high head through penstocks