I've been thinking about this for a while. Consider how quick LLM's are.
If the amount of energy spent powering your device (without an LLM), is more than using an LLM, then it's probably saving energy.
In all honesty, I've probably saved over 50 hours or more since I started using it about 2 months ago.
Coding has become incredibly efficient, and I'm not suffering through search-engine hell any more.
Edit:
Lemmy when someone uses AI to get a cheap, fast answer: “Noooo, it’s killing the planet!”
Lemmy when someone uses a nuclear reactor to run Doom: Dark Ages on a $20,000 RGB space heater: “Based”