Even still, using electricity does not automatically constitute illegal activity. My wifes kiln uses way more than my grow uses, and some months that sum bitch is running non stop.No warrant is required to view your power records. In some areas, my own included, one can view the power consumption of any building just by inputting the address. Some power companies routinely notify local police of "suspicious" consumption.
So even if they do think you are up to something, what are they gonna do about it besides knock on your door and hope you answer?