energy/power

[mylevt]

Hi,
Looking them up in the dictionary, I see that the two words "energy" and "power" have the same meaning, which confuses me a lot when I have to choose one. In this case, I tend to choose "energy". I don't know if it is correct.
I would like you to show me the way to think correctly.
"Water gives enery/power without pollution."
Thanks.

[bhaisahab]

In your sentence both are correct.