Some energy companies are bigger than others of course, so the total they spend on building new green electricity sources is useful to know, but is not the whole story.
To get meaningful comparisons you need to simply see how much is spent per customer. This shows you how much of your electricity bill actually gets spent each year, building new sources of green. And how much of a difference you make by being with your supplier. It's that simple - We call it pounds per customer. And it's the acid test of green commitment. It's simple enough maths too - Just take the total number of customers each supplier has and divide that by their total spend on new green electricity sources in any given year. For the last 4 years we've been doing just this and publishing the results at whichgreen.org
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