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Delays and exits in the transmission queue since 2021How often connection dates move, and how many projects leave the queue. Gate 2 in the transmission queueHow much of the queue has a Gate 2 offer, and what it did to connection dates. The battery queue and CMP470’s commitment feeHow far the battery queue sits above the line that would switch CMP470’s commitment fee off. Changes of customer in the transmission queueHow often connection agreements move between companies, and how those projects fared. Do projects connect on time?How late stages have connected against their connection date in the register. Which connection dates slip least?Which connection dates are pushed back least, allowing for how far ahead they are. Grid outages and the connections due by 2030How many of their planned outages the transmission owners carry out, against the connections due by 2030.

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Transmission / Projects / England and Wales

Cilfynydd BESS

Cilfynydd BESS Limited at Cilfynydd 400kV Substation

Connection date
15 Oct 2037
Gate
Gate 1
Status
Scoping
Technology
Storage
Total capacity
350 MW
Connected now
0 MW
Still to connect
350 MW
Transmission owner
National Grid Electricity Transmission (NGET)
Agreement type
Direct Connection
Region
England and Wales
Project number
PRO-002756
In the register since
June 2023

What would CMP470’s commitment fee do to a battery like this? See the use case: Will CMP470’s commitment fee clear the battery queue?

Change history

Every change to this project across 151 registers from 29 Jan 2021 to 5 Nov 2026.

  • 27 Oct 2026 register
    Connection date moved from 15 Sep 2037 to 15 Oct 2037 (+1 month)
  • 10 Oct 2026 register
    Connection date moved from 15 Oct 2037 to 15 Sep 2037 (−1 month)
  • 16 Dec 2025 register
    Marked as Gate 1
  • 27 Feb 2024 register
    Connection date moved from 15 Sep 2037 to 15 Oct 2037 (+1 month)
  • 30 Jun 2023 register
    Added to the register

Also at Cilfynydd 400kV Substation

Substation view

8 other projects, 3 GW still to connect at this substation in total. 2.3 GW is due to connect here before this project’s connection date of 15 Oct 2037.

Status definitions (NESO)

Scoping: NESO is not aware that a planning application has been made.

Awaiting Consents: NESO is aware, or the customer has told it, that a planning application has been made.

Consents Approved: NESO is aware, or the customer has told it, that the planning application has been approved.

Terminated: used by NESO only in its register of 30 April 2021, for two projects that left the register the next month.

These statuses are NESO’s, not QueueWatch’s, and NESO describes them as “as far as we are aware”, so a project may be further along than its status shows.

Source: NESO