They aren’t talking about growing wheat indoors, and when they talk about tunnels it’s a bed crop in a field with plastic over it like you’d see over a box in the city.
Indoor growing has some cool stuff going for it, but you’re not going to grow row crops that we currently harvest headers wider than your greenhouse.
You’re also unlikely to put those under solar, if you’re going to do solar on that patch, it’s probably not worth farming a crop that produces 1000$ per acre under it when the solar is going to be producing way more than that.
My area averages about 175 bushels/acre for trash soil and closes in on 250/acre for prime River bottoms.
$1125 an acre without expenses is what you can expect in a GREAT year. But that's every year and it's insured against crop failure. The last years that we farmed, about 70% of our gross went to expenses. So figure about $450/acre in profit (mostly to pay for my house and food and what not).
Can electricity compete with that? I genuinely do not know.