i think usually the busts that happen over electricty happen when someone is running like 6000w of lights, all on the same cycle. its easy to see huge drops like that, and they really stand out. that article in the legal forum said that the dudes who got nabbed were running something insane:
Officials' suspicions were first raised when NIPSCO said Monday that the house had averaged between 2,300 kilowatts per hour to 2,700 kilowatts per hour in the past four months. An air-conditioning wall unit uses about one kilowatt per hour, meaning the house was using the energy of what amounted to running 2,300 to 2,700 air conditioning wall units per hour.
now, there is some controversy as to whether this is accurate, as that is an INSANE amount of energy per hour.