$2.2 Billion divided by 140,000 homes = $15,714 per home.
$15,714 at 5% cost of funds and/or opportunity cost = $786 per year for interest or opportunity...$65.50 per month.
To pay back $15,714 in 30 years is $84.36 per month if no one makes a profit or has any expenses such as employees or maintenance.
Realistically, break-even would be lucky to be $100/month per home.
Now, if you can bill homes $200/month for their power usage, then you are golden!
Don’t forget the need for new infrastructure before the end of 30 years. Parts and equipment will need to be replaced. I’d be surprised if you didn’t have significant need for replacements in five years.
No doubt property requirements affect the cost of growth. And besides maintenance, there might be limits to the useful life of the components short of 30 years.