I dont think the power company really gets alarmed and activly seeks out grow ops.
I think if there is reason for the cops to investigate you, they can use your 300 dollar power bill as a clue, or if the power guy comes and sees your meter spinning like a top, and you have light leaks, or smells, etc... they are obligated by law to report you. But I dont think they actively seek out cannabis growers, unless there is an ordinance or something.
ALWAYS remember to keep everything out of sight, and out of smell, always keep doors locked, and if anyone asks about your power bill just tell them you had to hook up a couple old freezers to store some deer meat or something.
If cops come to your house, meet them outside and lock all your doors behind you, be polite to them, and never let them in unless they have a warrant.
After they leave, get rid of everything, as they will be back.
If they have a warrant, say nothing to them, let them arrest you, and get a good lawyer.
One of the best things to buy is a few growroom and front door cameras just incase the police come, they do so many illeagle things when they raid places that if you get it all on video, your lawyer can usually get things dismissed from your case.