The Guardian, 26 August 2008

How dirty is your power supplier?

Ecotricity, which figures prominently on green lists, mixes coal, nuclear, renewables and gas in almost equal amounts. The firm concedes it does not have a 100% green fuel mix although it does offer a 100% green supply for those who want it. "We are working towards more renewables. Our most popular tariff is made up of around 70% brown energy. Buying existing green energy, which is what most 100% tariffs contain, does nothing at all to reduce CO2 emissions or increase UK green energy capacity - you simply take something that already exists and have it for yourself.

"Robbing Peter to supply Paul is how we like to describe it. Most 100% green tariffs are a con, because they tell you you'll reduce your carbon footprint etc, but don't tell you someone else's will go up as a direct result. Nothing really changes - it's just a redistribution of existing green sources."

Source: http://www.guardian.co.uk/money/2008/aug/16/energy.householdbills