1. Reinstatement of NTS Interruption
6th November 2008

2. Background
Modification Proposal 0090 “Revised DN Interruption Arrangements” removed existing DN and NTS Interruption arrangements from October 2011
Enduring arrangements for NTS Interruption from October 2011 were to be set out in Mod 0116 “Reform of the NTS Offtake Arrangements”
Competition Commission ruling on the approval of 0116V has delayed the start of the enduring NTS regime
There is therefore no access to NTS Interruption beyond October 2011

3. Impact of the Inability to Access NTS Interruption
All NTS Interruptible load effectively goes Firm
Significant additional transportation capability would be required
Timescales to construct this capability are insufficient
GNCC would be unable to use NTS Interruption to manage system constraints
Use of Operating Margins gas or entry capacity buybacks may be less economic than Interruption
Efficiency of the operation of the Total System may be reduced
Increased probability of a constraint leading to a Network Gas Supply Emergency

4. Proposed Next Steps
Raise a Modification Proposal to change the UNC Transitional Document Section IIC to retain the ability for National Grid NTS to access NTS Interruption beyond October 2011
Use of NTS Interruption as an economic and efficient commercial tool for constraint management can continue until alternative tools are introduced through Exit Reform