hydro vs powerhouse

hydro

noun
  • hydroelectric power 

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

adj
  • hydroelectric 

  • hydroponic 

powerhouse

noun
  • A power station; the building housing a power station 

  • A very good hand of cards, likely to win. 

  • Any source of power, energy or strength; a source of influence or inspiration 

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