Electric companies are starting to install new, digital meters for their customers. These meters allow the meter reader to just drive by the house to record your usage. Also, they are able to monitor when you use your electricity because the companies want to charge more for usage during peak times (during the day), and less for after hours usage. That means these new meters will be able to detect usage patterns for individual homes. EG. from 9 PM to 9 AM every night Joe Blow's usage spikes by 2400 W or whatever.

Naturally, you are going to want to save money by running things at night, but these patterns are what cops will look for if they have probable cause to investigate you, not necessarily the amount of electricity you use.

So, stay safe all.