National Trust Green Energy - http://www.ntgreenenergy.org.uk - ( more details )
Leaner, greener electricity that comes from 100% renewable sources so there's no extra cost to customers or the planet.

npower Renewables - Sustainable - http://www.npower-renewables.com/ - ( more details )
One of the UK's leading renewable energy companiesm, dedicated to generating electricity using sustainable, environmentally-friendly resources.