Power Systems
The power station that does not requier any moving part is

 Solar power generation.
  Thermonic convertor.
 Tidal power generation.
 Wind power generation.

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

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