A couple of weeks ago I wrote about using personal power devices (such as CHP and wind turbines) to provide the power for your office and help lower those escalating power bills.

Now an article at the BBC describes how some companies and individuals are doing exactly that, including the Co-operative building in Manchester.

They expect to save 4% by having a mini farm of turbines on their roof, and up to 30% by using a combination of other 'green' technology.