As far as the finances, I think almost any rooftop installation over about 3kW will have an ROI well over 10%. As I said in the start of the thread, the income can be offset for tax purposes by the capital cost allowance until the entire cost has been used. Then, if you're an old fart (or a pending old fart like me) the income will be taxed in a lower/lowest bracket since my income in retirement will be quite modest.
This is why I didn't say too much detail. Everybody's circumstances are different. As a virtually old fart individual, no way it will even be 5% for me after tax, 3-4% likely if nothing much breaks over 20 years (except the inverter, that is almost guaranteed to, allowed for it); that's why I said "borderline" and "hobby" LOL. The only way anyone could reasonably get in the 10% ROI range over 20 years is if they're doing some of the installation and other work themselves, if they paid virtually no tax, paid cash, and installed during the 40% domestic content period. Also there is economy of scale to offset the fixed costs; we were looking at 3-4kW since that suited all of us, though some individuals (like me) could no doubt go bigger. Just saying... The Ontario government isn't giving anything away (I know this surprizes you!), they ran the same numbers we do. Some will benefit more, some less. It does seem that by far the best ROI would be on a ground installation in a non-suburban/city yard, probably a rural/farm residence (space on ground to avoid shade). Unless they change the rules. And of course if the building is completely an income property/business, that helps a lot.
For our TO area rooftop installs, we figure it'll take 10-12 years to write off our capital costs with income. 12 seems most likely for me after one inverter replacement, so that's 8 years to make any profit for the "20 year investment". You don't need to earn that much in Ontario/Canada to be in the highest tax bracket, plus I have no other write-offs right now, who knows later. My age figures in, no RRSP deductions during much of the "profitable period" and in fact they will have to have been closed/converted etc. during the contract period. Circumstances differ hugely for everybody, those are just some of the things I considered...did I mention I don't have a lot to do?
The lawyer who is part of our investigative cabal is pretty upset about what rights the microFIT contract gives to the Ontario government. I don't understand the words at all, but he picked it out pretty quickly so it must (??) be something quite obvious (to a real estate-oriented lawyer). Has to do with who owns the "rights" to your solar generation; he is certain it isn't the home-owner, and is certain the Ontario gov. has the right to sell any ensuing "benefits" to whoever they want, for whatever reason, whenever. For the duration of the contract period, which means you could be obligated to do something you (or the future house owner) don't prefer to do at some point. IOW, like any proper contract, there are matters of performance and benefit for both sides. Perhaps you know what he means, it was a week ago and I had enough trouble following it even when it was fresh...not a deal-breaker for me, but then I don't fully understand it. His example sounded like a far-fetched worst-case scenario to me, but I think he was just trying to make the point in a BIG way so we'd understand it without the legal gobbledy-gook...