In a small town in Germany

When I checked into my hotel in Hattingen in the heart of the Ruhr, I never noticed the roof. It is a modest hotel and I reached it from Frankfurt having taken a bus, three trains and a taxi. Eventually I did notice the array of photovoltaic panels on every part of the free south facing roof space. Perhaps one day all roofs will have photovoltaic and thermal panels as a matter of law, but until then we can see what is happening in a small town in Germany and take heart.