If it says ÉNERGIE, then it's going to be a French card, if it's ENERGIE without the accent, then it's either a German or Dutch card. Unless it's a first edition in mint condition it isn't really worth anything (and even then, since it's an energy card, something like that would be worth maybe $1 at absolute best), but still kind of a neat card to have if you don't have any other international cards in your collection.
Also, I see you asked this in the proper TCG board as well, so just going to go ahead and close this thread up for you.