I'm not familiar with the precise rate they are currently accorded, but I believe they have an incentive rate; plus they do receive the wind power incentive payment, which helps make it a more attractive situation for them.
Our particular representation had to do with the burden that accrues to developers of wind energy with respect to their payments to landowners and the GST characterization that is required of them. In some cases you may have up to a hundred landowners in a major wind development receiving a payment flow, and it becomes administratively burdensome. So one solution would be to treat them like every other basic defined natural resource, and you would not be subject to GST.