NEC Network Emergency Exercise - Exercise Prelude

1. NEC Network Emergency Exercise - Exercise Prelude

2. Prelude • Review of the objectives of the exercise and actions taken • What was tested on each day of the exercise • Reporting • Next Steps and Contacts

3. Gas Act 1995 Network Code E/3 for detailed incident management Prelude – Industry Exercise • Overall Objectives • Test the overall framework of Network Gas Supply Emergency procedures • Test communications and understanding across industry. • Ensure continuity and alignment of process. • Testing transporters E3 procedures Gas Safety (Management Regulations 1996 NEC Safety Case Transporters Safety Case E/1 Network Gas Supply Emergency procedure E/2 Local Gas Supply Emergency procedure

4. Highlights. • The scenario was a progressive Gas Deficit Emergency with multiple events over the two days. • Day One. • Stage 1 Declaration • Formation of the Network Emergency Management Team • Communication with participants and System Operators • Emergency Interruption • Stage 2 and Stage 3 • Declaration and Communication • Suspension of National Grid’s participation on the OCM as Residual Balancer • NTS and LDZ VLDMC Firm Load shedding • Day Two Highlights. • Completion of remaining Stage 3 Actions • Firm Load shedding of loads >25000 tpa • NGSE Stage 4 Isolation. • Distribution Networks Isolation Plans • NGSE Stage 5 Restoration. • NTS Restoration of Firm and Interruptible loads • Distribution Networks Restoration Plans

5. NormalOperations STAGE 1 STAGE 2 • Suspend National Grids residual balancing role • Maximisebeach • Maximise storage • Public appeal • Marketsin normaloperation • NG role ofresidualbalancer • Normallevel ofreporting • Gas Balance Alert Emergency Arrangements NGSE Stages STAGE 3 STAGE 4 • Firm loadshedding insize order • Isolation • NTS and LDZ stock • Emergency Spec Gas • EmergencyInterruption • Public appeal Stage 5 - Restoration

6. Uniform Network Code Obligations • Section Q – Emergencies • Section defined as fulfilling two purposes • Requirements to be complied with by Users • Consequences of a Gas Supply Emergency in respect of application of the Code • Requirements for users. • User contacts • Fax and Telephone Contact available 24hr / day as the primary user contact in a Gas Supply Emergency • Must have appropriate authority and responsibility • Site Contacts • Large Firm Supply Points (AQ >25,000 therms) • Interruptible Supply Points • Power and Authority to comply with directions • Contact details to be provided to xoserve for onward cascade to the relevant Transporters. • User Emergency procedures • User should ensure alignment with section Q and emergency procedures • Relevant personnel are familiar with the Emergency Procedures

7. Summary of Section Q Emergency Contact requirements. In addition to User contact details the User is responsible for providing the following site emergency contacts. (TPD Q 2.3 and 2.4)

8. Prelude reporting. • Whether the correct procedures were adhered to during the each stage. • Whether the notification method was correct according to the procedures. • Whether the information provided in any correspondence was legible and easy to understand. • Whether there was any confusion over what actions were required. • Whether or not there were enough people to implement the procedures required. • If the equipment was suitable for the job – was there enough equipment. • Ascertain the time taken to calculate the information required. • Ascertain whether the speed of response from the parties involved was reasonable. • If the Systems (including spreadsheets etc) were suitable for purpose.

9. Next Steps and Contacts • Target of December to produce the report for the HSE • All feedback is appreciated • Reports, observations and comments to: • gasops.emergencyplanning@uk.ngrid.com • Paul Youngman 01926 654151 • Claire Baldwin 01926 653232 • Lynn Crooks 01926 653223