Electricity, and how do you make it.

[Olefin]

Thats why I dont see the techs just abandoning the nuke plants unless they are in areas where they had fallout - and many plants have small backup generators made to keep those pumps working - and if anything probably didnt have mobs all over them pillaging and wrecking it was probably nuke plants - after Three Mile Island and Chernobyl no one would want to wreck a nuclear plant no matter how crazy they were

which is not to say they kept the plant on line - but you could see dedicated techs with locals helping out (who really dont want a cloud of fallout all over their houses) making just enough fuel to keep those pumps working - could be the source of an adventure - you get hired by such a group and promised spare parts or fuel or whatever to get critically needed parts for their pumps to avoid a meltdown - that just happen to be in a closely guarded town held by a marauder group

Also one thing to keep in mind - are you talking about a short term source of electricity like car batteries that eventually must be recharged using fuel to do so - or are you talking about long term electrical generation using solar panels or windmills or water power?