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Because in a drought there is not enough water to drive the turbines. So no electricity is generated.

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Q: Why are hydroelectric power stations not very useful in a drought?
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How many hydroelectric power stations are there in Britain?

There are hundreds of hydroelectric power stations in England.


Can traditional power stations be switched on and off at will?

No, they can't, they have to be powered up and down over several hours - especially nuclear power stations. This is why hydroelectric power stations are so useful to deal with surges in power demand, they can go from zero to full in seconds - Dinorwig Hydroelectric powerstation is the fastest, taking 12 seconds to go from 0 - 1,320 mw.


Why are there few hydroelectric power stations in UK?

because the conditions for a hydroelectric power stations in the uk aren't right so only a few can be built.


What is hydroelectric power stations?

A power station that harnesses power from running water.


Is it a better option to produce electricity as compared to hydroelectric power stations?

Hydroelectric power stations certainly have their advantages and disadvantages, as do all forms of electrical generation. Probably the best solution is to use a combination of different means of producing electricity, with hydroelectric stations as part of the mix.


What is Hydroelectric power?

Moving water can be used to generate electricity in hydroelectric power stations.


How is hydroelectric power is useful to us?

Hydroelectric power is a great way to keep our environment clean. Unlike gasoline, hydroelectric power combusts to form water as a byproduct which does not harm earth.


What is one situation where gravitational potential energy might be useful?

For example, in a hydroelectric power plant, where it is converted into electricity.For example, in a hydroelectric power plant, where it is converted into electricity.For example, in a hydroelectric power plant, where it is converted into electricity.For example, in a hydroelectric power plant, where it is converted into electricity.


Why is the control gate built near the dam in hydroelectric power stations?

for the passage of flood discharge


Which parts of the UK are best for building hydroelectric power stations?

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How a hydroelectric plant works?

Hydroelectric power plants or H.E.P stations use a flowing river to turn a turbine which powers the genertator much like other power sources to create electricity. The water is then returned to the river. H.E.P stations can also be in a reservoir.


How is hydroelectric energy be used in homes and businesses?

Whether the electricity is generated by conventional power stations, or hydroelectric power generation, the electricity used in homes and businesses will still be the same, and used the same.