The retailer signed the deal, which runs from April 2010 through March 2014, with London-based independent power supplier SmartestEnergy.
SmartestEnergy was launched in 2001 by Japanese power company Marubeni as a 'consolidator' of independently produced electricity in the UK.
In late 2008 it launched its ‘flexible’ renewable-energy retail service, which allows customers to specify the exact percentage of green electricity in their power mix.
