In reply to Fultonius:
I wouldn't necessarily hold Germany up as a shining example. Of course, things need to start somewhere, but Germany's system of solar generation has quite a lot of problems. Hydrogen production is a relatively inefficient way of storing power, it's difficult to keep a tank full of hydrogen, and producing electricity with it again (admittedly not what's happening in your link) adds another tier of losses.
At the moment, Germany's solar farm owners are additionally subsidised by PV collector area. Of course, as a PV farm owner, you want to maximise your profits, minimise your costs, and make you facility as simple to run as possible, so you build huge, cheap racks on farmland along side the autobahn, face it all south, and rake in the profits. Unfortunately, because the facility owners are not encouraged to use their PV farms to track the sun, there is a huge spike of PV power around midday (remember - the big difference between wind and solar is the best-case scenario - with suitable weather, wind farms can produce power 24/7, a simple PV facility will in the best case have a peak around midday). What the network then does, is either turn off the PV farms (and pays the owners compensation when this happens), or, takes the energy, transports it to Austria, and pays the Austrians to take it off their hands. This the Austrians gladly do, and use it for pumped hydro storage (there are a lot more opportunities for that in Austria than Germany due to the landscape), then, overnight, sells it back to Germany, essentially getting Germany to pay twice.
I'd like to see the subsidies to be more intelligently applied, perhaps providing a bigger m^2 subsidy for east/west facing facilities (to offset the reduced production), and still more for those that track the sun (to offset the greater investment and maintenance costs).
There are even greater problems in the subsidies applied to solar-thermal power in Germany - that is done purely by collector area, regardless of the type of collector. This leads to people using bigger, arguably less efficient types of collectors, in order to get the greatest subsidies.