I don't have a kill-a-watt meter handy anymore, but I do have a smart meter. Guesstimating using that, I hit ~ 850w with my threadripper when compiling and my work project and running a game at the same time, and about 650w when _just_ compiling (so presumably the difference there is GPU being under full load).

They're obviously extreme examples, but on the flip side, I've got an M1 Macbook Pro which lasts an entire day on a single charge of battery including running docker, slack, and some "mild" compiling (not large C++ projects). I'm not sure how to measure the energy consumption of it on battery, but suffice to say it's "very low".