hydro vs water power

hydro

• hydroelectric power 

• electrical power supply; specifically, electrical power provided by a utility (as a publicly-owned one); payment or bills for this. 

• hydroelectric 

• hydroponic 

water power

• Mechanical or electrical energy derived from running or falling water; originally obtained from a waterwheel immersed in a stream; modern hydroelectric power is obtained from turbines fed from reservoirs. 

• Used other than figuratively or idiomatically: see water, power. 

• A site capable of generating power or the right to use a site to generate power.