hopefully keeping the compliance costs of rps relatively low. to allow in the early year as new generation is being built, to have the utilities have more options in their procurement on where they're buying from. but over time, as resources come online there's less and less need for an unbundled rec in that bucket 3. >> and, so, just so that i understand, there is a greenhouse gas difference between bucket 1, bucket 2 and bucket 3? >> between the buckets there is not necessarily a greenhouse gas difference. there's other environmental differences, but not greenhouse gas. greenhouse gas is a global issue. so, it doesn't really matter where the -- i keep using wind farm. whatever the renewable facility s it doesn't matter where the facility is, as long as it's offsetting fossil fuel generation in that area, you're going to get a greenhouse gas reduction. and because it still has to come from an eligible renewable resource as we define it, even unbundled rec will offset the need for fossil fuel generation from places. again, it is important how a contract is constructed. there are ways to --