is it affordable?.

The photovoltaic setup alone would cost about $100,000 in the U.S.

@ Harvey: Not so. First, there are full service providers like Solar City, look 'em up and you will be surprised about what you find.
Secondly, let's say you really go and buy these panels (see pricing on ebay). What you will find is that a 240 W panel covering 1.6 sq meters is around 200 bucks, making this 150 sq meter installation a thing of $ 20k.
Yes, there is installation to count on top, and system parts. That ups cost usually by two-and-a-half, still well away from your 100 grand. All the while no more monthly bills for heat, power, and even fuel for your car if you have an electric one. Oil is dead, it just doesn't know it yet.
One watt whole sale is now below $0.50 and I well remember people said (20 years back) that getting to a buck per watt would start the solar revolution. We're at 50 cents and voila, hundreds of thousands of people are already working in solar energy. Soon to surpass half a million in the U.S. alone.

@ BeWalt Cost not subsidized price.

@ Slowburn: Funny you'd mention that. Take away all the subsidies and solar wins hands down, tomorrow.
There's lots of great info about energy subsidies and especially in the U.S. and lo and behold renewable subsidies are *dwarfed* by the ones the non-renewable oldies get.

@Slowburn
"In its 2013 World Energy Outlook, the International Energy Agency found fossil fuels received subsidies totalling $US544 billion in 2012, five times more than the financial support for renewable energy which was calculated to be $US101 billion."
http://www.abc.net.au/news/2014-09-24/green-bonds-on-the-rise-as-a-low-carbon-economy-becomes-profita/5765078

@Peter Mason, since when has a legitimate lower tax rate been a subsidy? There is not one instance of fossil fuels getting direct payments from governments whereas the renewable industry would fold if their direct payments from taxes were stopped.

@ ivan4: Thank you for that brilliant observation. Yes!! There shall be no more "subsidies", instead only "legitimate lower tax rates" may be allowable, from now on.
That will fix all problems, and all of us will finally agree, and fiscal budgets will experience no more losses. A tip of the hat to this nugget of conservative thinking.

Notice how when describing all the alleged benefits of these 'sustainable' (no such thing) projects they use words such as, should, could, may, might, so she there systems do not live up to the promise they have wiggle room.

This house has not been proven yet. All we have is a claim (guesstament). First the trials, then end users will determine the final performance.
As for the viability of "sustainable" energy, as in all technology, the proof will come with use. The proof is presently obscured by the existence of a controlled market, a taxed/regulated market. This unfree market distorts. A free market would give us the essential information we need to progress. Unfortunately, free markets are feared and vilified, hence, govt. When this irrational fear is replaced by unforced economic interaction, humanity will be free from a very destructive superstition.