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1. 
It is a clean energy , since it does not generate pollution through waste
A.
It's an advantage
B.
It' s a disadvantage
2. 
Alters the life of the fish in the river, which need its flow
A.
It's an advantage
B.
It' s a disadvantage
3. 
A large space is necessary to build the dam and the hydroelectric power station
A.
It's an advantage
B.
It' s a disadvantage
4. 
By adjusting the water flow, it can be adapted to the electricity demand
A.
It's an advantage
B.
It' s a disadvantage
5. 
High initial cost: the costs associated with the construction of the power stations and the reservoirs that feed them are high.
A.
It's an advantage
B.
It' s a disadvantage
6. 
Very safe: it can be said that hydroelectric power plants use water as their "fuel" to generate electricity, this makes them very safe compared to other types of power stations.
A.
It's an advantage
B.
It' s a disadvantage