Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 high energy loss in condenser
 low alternator efficiency
 high energy loss in boilers
 low steam turbine mechanical efficiency

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Power Systems
In hydroelectric power plants

 operating cost is high and initial cost is low.
 both operating and initial cost are low.
  operating cost is low and initial cost is high.
 both operating and initial cost are high.

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