Power Systems
The advantage of hydro electric power station over thermal power station is

 the initial cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required
 the operation cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year

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Power Systems
In order to have lower cost of power generaion

 the load factor should be low but diversity factor should be high
 the load factor and diversity factor should be low
 The load factor and diversity factor should be high
 the load factor should be high but diversity factor should be low

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