Hey Binbin,
The swaps account for approx 50% of Aneth production, so 50% is still exposed to spot rates.
Grieves is a put option so all production will be sold at spot rates.
Agreed the swaps are not ideal but we still have 50% production exposed to spot price, and as Dan has pointed out, we would not even have funding to purchase Aneth without the swap hedge (loan covenant).