was water powered/was powered by water?

< Previous | Next >


Senior Member
Hi there

I think author should write “was powered by water” instead of “was water powered”, if not, could you please explain me why?

A century later the picture was completely different: by then, the world had an electric industry, and a quarter of its generating capacity was water powered.

Reference: Sample of TOEFL Exam

Thank you in advance
  • grassy

    Senior Member
    They mean the same. 'Water powered' is an adjective and perhaps it should be hyphenated to make it clearer.
    < Previous | Next >