Where does “энергия” come from?

энергия (Russian) comes from German Energie, from Ancient Greek ἐνέργειᾰ.

Ancestry of “энергия”, step by step

Step	Language	Word	Meaning
1	German	Energie	energy
2	Ancient Greek	ἐνέργειᾰ	—

энергия — Etymology, Origin & Word History | Etymology Explorer