Because of the ongoing massive costs savings it is expected that within 2015 or so it will be cheaper for house owner's to produce their own energy with photovoltaic than buying it. (Without governmental support)
This will be a massive game changer: Decentralized, DIY, prosumer energy connected in a smart grid. The private rooth area and climate in for example Austria is enough to produce 1/3 of the electric energy used in Austria.
The Germans are actually ahead in this area because of current governmental price guarantees for selling self produced electricity back to the grid. This is stimulating accelerated cost savings development in the German solar industry.
According to [1] photovoltaic energy might be competitive in Germany by 2012/2013 in regions with a lot of sunshine and by 2016 "in regions with less intensive sunshine." (I'm not sure whether "less intensive" means average.) These numbers assume consumer prices and no subsidies. For industry users competitiveness is expected by 2019.
This doesn't answer his question, but anyway: it depends on how you account for things. When you take into account the production cost and materials needed for PV, electricity from them is not a sustainable energy source in any non-marketing meaning of the word.
You betcha ;-) Even for european standards this is leftist. They do have good articles though as it is usual for ideologists only on topics where the ideology doesn't already provides the answers.
Also, the mentioned bank is a state bank. Usually not the moste creditable ones. Especially not on issues that include subsidies.
I think he's mistaken is saying that it'll only come from PV; it's for all forms of 'sustainable' energy (I myself wouldn't count PV under that, but the popular opinion does so I'm including it here).
So it's including geothermal, air heat pumps, zero energy use for residential heating (high insulation and heat recuperation in ventilation systems), etc.
The Germans are actually ahead in this area because of current governmental price guarantees for selling self produced electricity back to the grid. This is stimulating accelerated cost savings development in the German solar industry.