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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

Wilton Lion BESS

SEMBCORP (WILTON BESS) LIMITED at Greystones A 275kV Substation

Connection date
Connected
Gate
Not stated
Status
Built
Technology
Storage
Total capacity
150 MW
Connected now
150 MW
Still to connect
0 MW
Transmission owner
National Grid Electricity Transmission (NGET)
Agreement type
Direct Connection
Region
England and Wales
Project number
PRO-001048
In the register since
January 2021 or earlier

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.

  • 1 May 2026 register
    Customer changed from SEMBCORP UTILITIES (UK) LIMITED to SEMBCORP (WILTON BESS) LIMITED
  • 10 Mar 2026 register
    Gate marking removed (was Gate 2)
  • 24 Feb 2026 register
    150 MW now connected
  • 24 Feb 2026 register
    Status changed from Under Construction/Commissioning to Built
  • 24 Feb 2026 register
    Given a Gate 2 connection offer
  • 30 Sep 2025 register
    Connection date moved from 31 Oct 2035 to 13 Oct 2025 (−121 months)
  • 29 Aug 2025 register
    Restructured from 6 stages (150 MW from 30 Sep 2023, 210 MW from 30 Sep 2024, 340 MW from 11 Mar 2026, 490 MW from 30 Sep 2027, 275 MW from 30 Sep 2027, 235 MW from 30 Sep 2030) to 1 stage (150 MW from 31 Oct 2035). First connection date +145 months
  • 28 Nov 2023 register
    Connection point changed from Greystones GSP to Greystones A and B 275kV Substations
  • 31 Oct 2023 register
    Stage 1: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 31 Oct 2023 register
    Stage 2: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 31 Oct 2023 register
    Stage 3: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 31 Oct 2023 register
    Stage 4: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 31 Oct 2023 register
    Stage 5: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 31 Oct 2023 register
    Stage 6: Technology changed from Gas (CCGT) to Storage, Gas (OCGT)
  • 30 May 2023 register
    Stage 1: Status changed from Consents Approved to Under Construction/Commissioning
  • 23 Dec 2022 register
    Substation name updated in the register (from Greystones to Greystones GSP)
  • 28 Oct 2022 register
    Stage 1: Capacity changed from 340 MW to 150 MW
  • 28 Oct 2022 register
    Stage 1: Connection date moved from 30 Sep 2024 to 30 Sep 2023 (−12 months)
  • 28 Oct 2022 register
    Stage 2: Capacity changed from 850 MW to 210 MW
  • 28 Oct 2022 register
    Stage 2: Connection date moved from 30 Sep 2026 to 30 Sep 2024 (−24 months)
  • 28 Oct 2022 register
    Stage 3: Capacity changed from 275 MW to 340 MW
  • 28 Oct 2022 register
    Stage 3: Connection date moved from 30 Sep 2027 to 11 Mar 2026 (−19 months)
  • 28 Oct 2022 register
    Stage 4: Capacity changed from 235 MW to 490 MW
  • 28 Oct 2022 register
    Stage 4: Connection date moved from 30 Sep 2030 to 30 Sep 2027 (−36 months)
  • 28 Oct 2022 register
    Stage 4: Status changed from Awaiting Consents to Consents Approved
  • 28 Oct 2022 register
    New stage added (275 MW from 30 Sep 2027)
  • 28 Oct 2022 register
    New stage added (235 MW from 30 Sep 2030)
  • 29 Jun 2021 register
    Stage 1: Capacity changed from 850 MW to 340 MW
  • 29 Jun 2021 register
    New stage added (275 MW from 30 Sep 2027)
  • 29 Jun 2021 register
    New stage added (235 MW from 30 Sep 2030)

Also at Greystones A 275kV Substation

Substation view

1 other project, 700 MW still to connect at this substation in total.

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