East of England Connections Fortnightly Update - September 2022

Update on progress made by UK Power Networks, National Grid Electricity Transmission, and National Grid Electricity System Operator in connecting low-carbon generation to the East of England Network. The update includes solution development progress, prospective timelines for 2022 activities, and technical and contract terms analysis for various locations. It also highlights upcoming customer engagement activities and industry interactions.

• East of England
• Connections
• Update
• UK Power Networks
• National Grid

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1. East of England Connections East of England Connections Fortnightly update Fortnightly update UK Power Networks, National Grid Electricity Transmission (NGET) and National Grid Electricity System Operator (NGESO) 12 September 2022

2. Introduction Dear customers, Thank you for your attendance and support at our forums, bilateral meetings and workshops. We are grateful for your help in developing and refining a series of technical and commercial solutions that should, in time, allow us to connect more low carbon generation to our East of England Network. It is a complex project with many moving parts, and we felt it appropriate that we begin to update you on a regular and consistent basis on our progress against the commitments that we made. We will be providing you regular fortnightly updates as to our progress both in terms of the solutions for specific GSPs and our review of wider strategic issues. We intend to hold another forum on the 14th December where we will take you through our progress across the programme of activities and give you the opportunity to ask us any questions. However, in the meantime if you have any specific queries please let us know. Kind regards

3. Solution Development Progress Wymondley RDP activity Burwell Eaton Socon Bramford Rayleigh Pelham Braintree Norwich Walpole Sundon In In In Bottom up exploration of issues by GSP progress progress progress Determine scope of works required in relation to GSP In In In progress progress progress Review studies to understand specifics of the constraint(s) In In In In progress progress progress progress Undertake further studies with additional technical data as required In progress Use output of study work to identify potential solutions In progress Cost Benefit Analysis process Solution confirmed In In Solution implementation progress progress EC5 boundary challenges 3

4. 2022 Prospective Timelines Extended timescales Activity completed Activity started Activity not started January February March April May June July August September October November December Technical / Contract terms Techno/economic analysis Solution Design BCA finalisation Burwell At solution implementation >> Customer Engagement Industry engagement Technical / Contract terms BCA finalisation Solution Design Options Analysis Technical analysis Eaton Socon CBA At solution implementation >> Customer Engagement BCA finalisation Technical Solution Design Assessment of local constraints Technical / Contract terms Bramford CBA Contract design Customer Engagement BCA finalisation Technical solution Technical analysis Assessment of local constraints Pelham - Wymondley Technical / Contract terms CBA Contract design Customer Engagement Rayleigh - Braintree BCA finalisation Technical solution Technical analysis Assessment of local constraints Contract design Technical / Contract terms CBA Customer Engagement EC5 Regional Assessment Ph3 Regional Assessment Regional Assessment Ph1 Regional Assessment Ph2 View on Capacity release Final report Summary update Queue Optimisation Monitor and optimise distribution & transmission connection queues 4

5. 2022 Prospective Timelines Extended timescales Activity completed Activity started Activity not started June July August September October November December January February March April May BCA finalisation Technical analysis Technical solution Technical / Contract terms Norwich Contract design CBA Customer Engagement Technical / Contract terms Technical analysis BCA finalisation Solution design Preliminary constraint analysis Contract design Sundon CBA Customer Engagement BCA finalisation Technical analysis Technical solution Investigations and early optioneering Walpole Technical / Contract terms Contract design CBA Customer Engagement *Timelines dependant upon EC5 project progress* 5

6. Solution implementation Burwell GSP Revised BCA drafted w/c 6 Jun Nature of Constraints: Burwell constraints are thermal for both import and export on SGTs, not impacted by stability constraint. The CBA concluded that reinforcement remains the most cost effective, long-term solution. Revised draft BCA approved by working group w/c 13 Jun ESO provides UKPN with the BCA (final BCA received 26 Aug) w/c 4 Jul Agreed RDP Solution: DERMS/Contractual solution agreed following extensive stakeholder engagement Battery solution agreed for Part 4 customers: Import curtailment based on 3 x seasonal windows Export curtailment based on 2 x seasonal window Final BCA reviewed and in the process of sign off by UKPN w/c 29 Aug Connection Offer variation process underway w/c 5 Sep This is an interim solution ahead of reinforcement works. Complete Transmission Reinforcement works: Attributable SGT reinforcement, 2028; no wider works On track Delayed GSP Infrastructure Site/Connection Asset Site: Planned infrastructure site Oct 2022 BCA Bi-lateral Connection Agreement 6

7. Solution implementation Eaton Socon GSP Nature of Constraints: Eaton Socon has export constraints relating to an infrequent infeed loss and thermal capacity of upstream circuits, this site is not impacted by EC5 stability constraint. Reinforcement remains the most cost effective, long-term solution. ESO provides UKPN with the BCA w/c 15 Aug Final BCA reviewed and in the process of sign off by UKPN w/c 5 Sep* Agreed Solution: DERMS to manage against a new reverse power limit on the SGTs Generation solution agreed for Part 4 customers Levels of export Curtailment based on revised reverse power limit Connection Offer variation process underway w/c 7 Oct* *delay in receiving the BCA and extended review cycle accounts for revised dates as shown This is an interim solution ahead of reinforcement works. Complete On track Transmission Reinforcement works: No attributable works, reconductoring and s/s re-build, 2028 Delayed GSP Infrastructure Site/Connection Asset Site: Planned infrastructure site 2028 7

8. Progress Update Bramford (EC5 boundary) RDP working group has defined a number of options for the creation of technical limits ESO senior managers have met to discuss the issue and review/discuss options and solutions the recommendations formed part of a more detailed deep dive via an internal ESO workshop on Wednesday 24th Aug Further points of clarity and points for consideration have been raised which will now be taken forward and used as a basis for a joint workshop with NGET in early September Existing CUSC, SQSS* and BSC** Frameworks being taken into account and used as a basis for discussion and solution optioneering to ensure consistency and fair treatment of all Users Next update on progress should be available to share post 15th September after joint ESO/NGET Workshop *Security and Quality of Supply Standard ** Balancing and Settlement Code 8

9. Progress Update Other GSPs Rayleigh, Pelham, Wymondley, and Braintree (EC5) Technical proformas for all four GSPs have been shared with UKPN/ESO and are currently being reviewed. It is envisaged that the solution being developed for Bramford to manage EC5 boundary constraint, will be scalable across each of this GSPs (plus any local constraint management solution that may also be required) Norwich and Walpole As well as local constraints, Norwich and Walpole are also impacted by wider transmission constraints similarly to the four GSPs above. Technical proformas for both GSPs are being developed Sundon Sundon is outside of the EC5 impacts and requires significant upstream reconductoring of overhead transmission lines. Technical proforma being developed and technical solution similar to Eaton Socon under discussion 9