1. Assured Pressures Proposal
Transmission Workstream
6th March

2. Background
NTS undertake network analysis based on the latest supply and demands required of the NTS
NTS provides an annual assured offtake pressure to DNOs
Actual physical system operates to assured pressure in summer and a higher pressure in winter
Compressors need to be run to attain pressure in summer
DNOs have to plan winter requirements to annual assured pressure

3. Summary of Proposal
Annual assured pressure is replaced with summer and winter pressures
Winter pressure applying 1 Oct to 31 March
Summer pressure applying 1 April to 30 Sept
Physical system operation stays the same but commercial regime is changed to more accurately reflect the physical
Summer / Winter pressures to be facilitated through OCS process, as annual assured pressure is now

4. Impacts Associated environmental benefits
Will lead to more efficient and economic operation of the system
Potentially lower assured summer pressures
Less compressor usage
Less compressor standby
Potentially higher assured winter pressures
Allows DNOs to plan to higher pressures
Associated environmental benefits
Minimal impact envisaged for Shippers but views sought

5. Next Steps Proposed that Mod be taken to March Mod Panel
Short consultation period (12 days)
Would seek a 1 June implementation in time for OCS process