electrical energy vs powerhouse

electrical energy

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

powerhouse

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

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

  • A power station; the building housing a power station 

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