Interruptible Reverse Flow (IRF) offers non-guaranteed capacity from the UK to the Netherlands. It is a virtual, administrative flow netted off from the physical forward flow from the Netherlands to the UK, meaning it can only be allocated when Forward Flow capacity has been nominated.
Interruptible Reverse Flow is sold for a period of quarter, a month or a day. Further details are give in the IRF Auction Procedure, Exhibit C. To become a registered shipper, please refer to the Become a BBL shipper page.
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TTF & NBP prices trendline
TTF: Dutch TTF Daily GasFutures (source IceEndex)
NBP: UK Natural Gas Daily Futures (source IceEndex)