Maybe it's something as dumb as the power company not having the right meter associated to the right apartment. Tenant A paying tenant B's power consumption, and B for A. A sees bigger bills, tries to conserve. Then B sees small bills, and thinks his usage is low and maybe it goes up as he thinks his loads are not burning as much power as they really are. And thus not worry about conserving. A's bills are now getting outragious enough to prompt her to have it checked out. ?
