It looks like some of the figures in the article I cited may be very wrong. Wikipedia says that Rough has 3.3bn cubic meters of storage, so 30Bcf total and say

It looks like some of the figures in the article I cited may be very wrong. Wikipedia says that Rough has 3.3bn cubic meters of storage, so 30Bcf total and says that equated to 9 days of supply. Looking at various other sources there seems to be a lot of confusion about what the consumption and storage figure are. 50% of 9 days is sorta like a week I guess... so that would add up. I think that there is a lot of confusion because of the difference between peak winter demand and normal daily demand. If one is boosting the capability I guess you would quote in terms of normal daily demand. If one was trying to show that it's pointless keeping it open then maybe you would do it in terms of peak demand.