As requested.

Far be it for me to complain about receiving an achievement, but, I don't think this applies in my scenario. My game is configured for peaceful mode. Started experimenting with the artillery, which is awesome, and generated a bunch of biter attacks. Hundreds of shells later and who knows how many ...

They don't have a drain value. They have an idle consumption value and an active consumption value.

Fair enough. However, I only made the connection based on other objects in the game that consume power while idle (or not in use) which have a drain value. Is the idle consumption represented, or ...

There is no drain wattage indicated for lights, however, they appear to have a drain of approx. 166W according to my crack calculation. Minor to say the least, but an observation on an idle factory.