Annual Interruption
Our latest demand forecasts show that we are seeing localised network growth largely due to flexible power generation and compressed natural gas vehicle fuelling sites connecting. This growth has led to areas of our network being constrained for pressure and/or storage. This is particularly impacting the South West Local Distribution Zone (LDZ) where we have been unable to secure increased flexible capacity to meet our requirements. Having interruptible contracts in place can help us to manage gas supplies and provide efficient solutions to existing and new gas consumers.
We are participating in the interruption process this year with Xoserve and are offering interruption to all eligible customers on our network. To be eligible, you must have a gas consumption of over 5,860,000kWh per annum. Typically, this means industrial and large commercial premises, and excludes all domestic customers.
Consideration will be given to all bids we receive, particularly those within constrained areas, as per the postcodes listed below.
Regardless of whether you are in a constrained area your bid may still support the development of optimal operating strategies and NTS Exit Capacity bookings.
Constrained areas of the network are detailed below:
Wales LDZ’s
No specific LDZ constraint, any bids considered
South West LDZ
Any bids considered; however, constrained areas are as follows:
BA14, BS1, BS10, BS11, BS16, BS18, BS20, BS23, BS24, BS25, BS26, BS32, BS34, BS35, BS37, BS40, BS49, BS5, BS8, GL1, GL10, GL11, GL12, GL13, GL15, GL16, GL2, GL20, GL3, GL4, GL5, GL51, GL52, GL53, GL54, GL56, OX18, SN10, SN16, SN3, SN4, SN5, TA21, WR10, WR11, BA7, BS2, EX1, EX2, EX4, EX5, PL1, PL11, PL14, PL15, PL16, PL17, PL20, PL21, PL24, PL26, PL31, PL4, PL6, PL7, TA18, TQ12, TQ2, TQ4, TQ6, TR1, TR10, TR12, TR15, TR27, TR8.
The Process
To enter into an interruptible contract with us, you must successfully bid for interruption rights through an interruption tender process. There is a 2-week bid window open each year in June, when offers for interruption can be submitted.
Key dates for you:
26th April: DNs send interruptible requirements to Xoserve
2nd May: Xoserve publish interruptible requirements
1st June to 14th June: Bid window for customers
19th July: Contract notification from DNs to Xoserve
20th July: Bid and contract information is sent from Xoserve to Shippers/DNs
24th July: Summary reports by location and LDZ sent from Xoserve to DNs
25th July: Summary reports by location and LDZ sent from Xoserve to Shippers
If we accept bids from you through this process, then you will become a Contracted Interruptible customer and will be compensated through payment of the Option Price and Exercise Price in return for capacity. These prices are specified in the bids made during the interruption tender process and become part of the interruption contract when the bid is accepted by the distribution network.
Under the terms of Uniform Network code (UNC), bids for interruption are made by shippers on behalf of their customers, and an interruptible contract is between the distribution network and the shipper.
Submitting your bids
Please ensure that bids are submitted via your shipper to Xoserve in the required format.
Find out more
Further information relating to DN Interruption can be found on the Joint Office website.
If you have any queries, please email:
LTSAnalysisRequests_NMU@wwutilities.co.uk