Friends of the Earth (FoE) has published a new league table of renewable electricity retailers to help customers choose the greenest supply. Topping the table is Unit[e] UK which, according to FoE, offers the greenest deal. "It buys all its electricity from green sources," explains FoE's Byony Worthington. "It also offers the clearest commitment to doing more than is legally required." Unit[e] offers its 5000 customers a mix of 65% wind and 35% hydro. Of the two main types of green tariff: energy based-which buys renewable energy to match the customer's energy use, or fund based-which puts money aside to fund renewable projects, FoE comes down in favour of energy based tariffs. Friends of the Earth says its league table is based on "an interpretation" of electricity regulator Ofgem's green supply guidelines, published in April. Some 60,000 customers so far have switched to green tariffs, with total annual sales of 250 GWh, worth over £15 million. Wind energy provides most of the power by far for those of the six "greenest" suppliers who declared their power sources. Green supply, however, remains a pitifully small fraction of the whole.