electrical energy vs hydro

electrical energy

noun
  • Energy made available for consumption or consumed in the form of electricity or electric power; electricity. 

hydro

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

  • hydroelectric power 

adj
  • hydroelectric 

  • hydroponic 

How often have the words electrical energy and hydro occurred in a corpus of books? (source: Google Ngram Viewer )