The world's first green electricity company, Ecotricity, started up in 1996 and now has 51 wind turbines dotted around the UK. Its Greenbird project, designed to demonstrate the potential of wind energy to power the cars of the future was met with some scepticism, with some bloggers saying it was an attempt to draw attention to the company and its products.

Ecotricity has also attracted the wrath of those living near the planned location of their windfarms, for example in Norfolk where an appeal from locals against planning permission was eventually dismissed by the high court. However things don't always go its way. Dale Vince, founder of Ecotricity, complained this year that wind energy is the only energy source that has its planning consent granted by district councils. He described this as an "absurd anomaly".

Despite these obstacles, Ecotricity says its wind turbines generate the green electricity equivalent to the usage of 41,000 homes, saving 129,000 tonnes of CO2 every year. It supplies organisations including the Co-operative bank and Lush cosmetics and is backed by Oxfam and the Soil Association.

"Green gas", supplied from renewable sources, is to be made available for the first time to UK homes by Ecotricity. Biogas has the potential to generate as much as half of the UK's domestic gas with the right government backing, according to Ecotricity. Special strains of algae could one day see us growing our own source of "green gas". Just as with Ecotricity's not-for-profit electricity business model, the company promises to use the money from customers' gas bills to invest back into new sources of green gas, with the aim of helping to prevent climate change and making Britain energy independent.

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