Centrosolar AG, an otherwise unremarkable German solar company, rose 0.7% today - the company has just received a repeated buy recommendation from Goldman Sachs.

The firm is not short of admirers - like Sven Krupp of AC Research, who gave it an "accumulate" rating at the end of March 2007. And unlike some German alternative energy companies, it is clearly interested in expanding sales beyond its borders. In the last financial year, 29% of consolidated revenue was from outside of Germany. This matters a lot if - as some believe - the political risk of Germany's solar subsidies being cut off is real and on the horizon.