Working Out How Green An Energy Supplier Is

If you believe marketing spin and hype then you could be led to believe that all the energy suppliers put green issues front and centre in their mind and when they dream they are filled with green windmills and solar cells.
We all suspect the reality is different to this, but how can you actually work out what each supplier really DOES when it comes to being green?
WhichGreen has an interesting set of charts that look at which suppliers are building new sources of renewable energy, and this is based on how much new build is being developed per customer. This is because clearly some companies are much larger than others therefore a gross figure could be misleading as the actual percentage spend could be a lot less than other, smaller companies.
The site has a six year average table which can be seen here:
http://www.whichgreen.org/league-tables/six-year-average
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