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World Energy draws a distinction between "physical green power" and RECs,
http://www.changesbristol.co.uk/, with the former being produced from renewable sources on the same ISO as the customer,
wholesale golf clubs, and the RECs often produced somewhere else in the world. I don’t think this is a very useful distinction,
http://www.picdisk.co.uk/, since the actual power produced is often not the same as the power consumed due to both proximity and timing issues. A simple example of why this is so can be seen in the case of a supermarket that signs up for 100% locally produced wind power.