Green Energy in Energy Search

I think it would be great if you could display %green electricity and in particular since this is less available % green gas (and carbon-offset gas) in your search for suppliers and allow that as a selection criteria. - either via a separate search, or within the main search. This is becoming more of a requirement for environmentally aware customers who might be prepared to pay a premium, and it would be good to raise awareness of their choices among the rest. I believe all suppliers produce this information.