I think it should be somewhere in between the rate of a normal generator and the rate you pay, as it’s unlikely your power needs to go over the transmission network, it’s more likely it just goes over distribution to another local user. However I do understand why it’s paid out at the wholesale generation price as (for example) a solar farm would.

As far as disabling it, why would you want to? You can install things like a battery to store it so you can use it later, but if you didn’t have that and weren’t using all the power then you may as well feed it back into the grid. You only feed in the stuff you haven’t used. It’s not like you sell it to them then pay for that same power again.

You may as well get the couple of dollars + provide that renewable power for someone else to use.