By John Vidal, environment editor
The Guardian (London)
Saturday December 29 2007

The holy grail of renewable energy came a step closer yesterday as thousands of mass-produced wafer-thin solar cells printed on aluminium film rolled off a production line in California, heralding what British scientists called “a revolution” in generating electricity.

The solar panels produced by a Silicon Valley start-up company, Nanosolar, are radically different from the kind that European consumers are increasingly buying to generate power from their own roofs. Printed like a newspaper directly on to aluminium foil, they are flexible, light and, if you believe the company, expected to make it as cheap to produce electricity from sunlight as from coal.

Yesterday Nanosolar said its order books were full until mid-2009 and that a second factory would soon open in Germany where demand for solar power has rocketed. Britain was unlikely to benefit from the technology for some years because other countries paid better money for renewable electricity, it added.

“Our first solar panels will be used in a solar power station in Germany,” said Erik Oldekop, Nanosolar’s manager in Switzerland. “We aim to produce the panels for 99 cents [50p] a watt, which is comparable to the price of electricity generated from coal. We cannot disclose our exact figures yet as we are a private company but we can bring it down to that level. That is the vision we are aiming at.”