A contributer writes.....
To my shame, I used to work for npower (albeit in the renewables division) and they are the biggest bunch of sharks you will ever encounter. Regarding 'tearing up your npower contract', the best approach is as follows:
1) Switch supplier, to either Ecotricity or Good Energy, neither of which invest a penny in fossil or nuclear generation.
2) Write a letter to Andy Duff, RWE npower's CEO. He's based at their Swindon HQ. Address is:
Windmill Hill Business Park
Wilts SN5 6PB
thanks for this info!