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Advantages

Fuel is not burned so there is minimal pollution
Water to run the power plant is provided free by nature
Hydropower plays a major role in reducing greenhouse gas emissions
Relatively low operations and maintenance costs
The technology is reliable and proven over time
It's renewable - rainfall renews the water in the reservoir, so the fuel is almost always there

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Disadvantages

They use up valuable and limited natural resources
They can produce a lot of pollution
Companies have to dig up the Earth or drill wells to get the coal, oil, and gas
For nuclear power plants there are waste-disposal problems

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Typical hydroelectric power plant

Hydroelectric energy is produced by the force of falling water. The capacity to produce this energy is dependent on both the available flow and the height from which it falls. Building up behind a high dam, water accumulates potential energy.

Advantages	Fuel is not burned so there is minimal pollution Water to run the power plant is provided free by nature Hydropower plays a major role in reducing greenhouse gas emissions Relatively low operations and maintenance costs The technology is reliable and proven over time It's renewable - rainfall renews the water in the reservoir, so the fuel is almost always there
Disadvantages	They use up valuable and limited natural resources They can produce a lot of pollution Companies have to dig up the Earth or drill wells to get the coal, oil, and gas For nuclear power plants there are waste-disposal problems
Typical hydroelectric power plant	Hydroelectric energy is produced by the force of falling water. The capacity to produce this energy is dependent on both the available flow and the height from which it falls. Building up behind a high dam, water accumulates potential energy.