Two things - if you're building in a rural area, people talk. Word gets around. So I'd get out in front of the issue and take control of the narrative right from the beginning. Let the builder know that you're a potter, and that this part of the structure is going to be a ceramics studio. Potters need kilns, and kilns take a lot of heat - either gas or electric. If you decide to offset some of the use with a generator, that would explain the gas usage. Or, you could use that story to explain a larger electric bill.
Even put a sign out by the mailbox, "Sunrise Pottery Studio" or something. Get on mailing lists and have lots of pottery-related junk mail delivered on a regular basis. The mailman will notice, and again, word gets around. Neighbors and service vehicles driving past (and sheriff's deputies) will notice, and pretty soon everybody in the immediate area "knows" you're running a small, hobby-sized pottery studio. Just be sure you know enough about pottery and ceramics to know what you're talking about if the mailman or a neighbor strikes up a conversation.
Second, you need to be mindful of heat issues. If there may already be suspicions about your energy use, it's not a really good idea for that grow space to be significantly hotter than the rest of the house, because a chopper can spot that from literally miles away. You're going to want to insulate it well, or plan on keeping it climate controlled to match the temperature of the rest of the house. Again, the pottery studio cover story is useful here, but it's better not to attract the attention of a helicopter drug team in the first place. As soon as they start checking into it, the first thing they hear may be your cover story, but since they've already gone to the trouble of starting to ask questions they may decide to just poke a little further and ask a few more.
And what provisions have you made for venting the excess heat? You can't just blow it directly out of the building into the open. Infrared cameras on a helicopter will see that like the exhaust from a jet engine. At night, it will look to an FLIR unit as though you're testing a rocket engine. Check out Barry Cooper's "Never Get Raided" video on Youtube; they show footage of what a grow house actually looks like at night. It's pretty eye-opening.
Honestly, the heat disposal question is probably just as important as the electrical question, in terms of security. I'd give that a lot of thought, because the place you're talking about building could fit fairly well within the range of a grow house profile - new building in a remote area, one room (or even a separate structure) with atypical design features and heavy-duty electrical infrastructure, very high energy usage from the start, maybe someone who is a stranger to the area, etc. If that's a separate building, and it's hotter than the house, it's going to arouse a lot of suspicion. Cops can't legally use FLIR to get a warrant, but they do regularly use it to confirm that this is a house they need to have a closer look at, and then they start looking for other data to establish probable cause.
Edit: Oh, and if your area has mandatory smart meters, I would definitely lean really hard toward alternative energy sources like solar, generators, etc. It's more expensive, but what's your freedom and your property worth? Because if you get popped, you lose both.