There are a lot of benign things that can cause high power usage. Perhaps you got a hot tub, or a tanning machine. Perhaps you jumped on board early with an electric car. Perhaps you are starting a part time online business and setup a few powerful servers. Perhaps you built a home theater, or a recording studio. Perhaps you're into fish and run over 5kw worth of halides over your various reef tanks (like a friend of mine has for the past 10 years) . Thing is there are many reasons your electricity might be high, and it's going to be less common to see it associated with a grow op. In my mind the key is to reduce other signs so that if for some reason you got flagged and someone did some looking around in your garbage, or watched your house for a bit, or walked around the outside sniffing, nothing else would give you away and it will be assumed you are doing any number of the other things that can cause a jump in electricity usage.
Hell, if you're really worried about it, pick one of the above excuses and call your power company. Say you started an internet business and have a few servers running from your house, and that they sent you this message about your usage, and that you were concerned it was a problem or something. Play like a total idiot. Good chance they'd note your account as having some server equipment and you'd never have to worry about getting flagged again.