Renewable energy - small but practical action

Juice is npower's windpower electricity tariff, and it's supported by Greenpeace. They're building a wind farm which will serve 50,000 households. When the limit is reached, they'll build another one. The electricity isn't any more expensive than their standard tariff. (Although unlike Southern Electric they don't give Airmiles, but guess they have to be sacrificed on the altar of social conscience.)

Southern Electric rang me to find out why I was changing. They didn't have an answer to "I want renewable energy and am exercising consumer power to get it". I hope that answers get fed back to higher management - suppose they must do or else why have a department to chase leaving customers?