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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

Pembroke BESS

RWE Generation UK Plc at Pembroke 400kV Substation

Connection date
7 Mar 2029 +16 months since 9 Dec
Gate
Gate 2
Status
Consents Approved
Planning consent
Granted 31 Jan 2025
Pembrokeshire, reference 24/0600/PA · Source: REPD
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-000337
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?

Stages

StageConnected MWAdds MWCumulative MWDateGateStatus
102852857 Mar 2029Gate 2Consents Approved
206535025 May 2029Gate 2Consents Approved

Change history

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

  • 18 Sep 2026 register
    Stage 1: Status changed from Awaiting Consents to Consents Approved
  • 18 Sep 2026 register
    Stage 2: Status changed from Scoping to Consents Approved
  • 1 Sep 2026 register
    Restructured from 1 stage (350 MW from 29 Oct 2027) to 2 stages (285 MW from 7 Mar 2029, 65 MW from 25 May 2029). First connection date +16 months
  • 29 Oct 2024 register
    Connection date moved from 1 Oct 2026 to 29 Oct 2027 (+13 months)
  • 30 Jun 2023 register
    Connection point changed from Alverdiscott 400kV Substation to Pembroke 400kV Substation
  • 30 May 2023 register
    Connection point changed from Pembroke 400kV Substation to Alverdiscott 400kV Substation
  • 28 Apr 2023 register
    Substation name updated in the register (from Pembroke 400kV to Pembroke 400kV Substation)
  • 31 Jan 2023 register
    Renamed from Milford Haven
  • 31 Jan 2023 register
    Customer changed from EGNEDOL PEMBROKE ECO-POWER LIMITED to RWE GENERATION UK PLC
  • 31 Jan 2023 register
    Technology changed from Biomass to Storage
  • 23 Dec 2022 register
    Renamed from Pembroke BESS
  • 23 Dec 2022 register
    Technology changed from Storage to Biomass
  • 29 Nov 2022 register
    Renamed from Milford Haven
  • 29 Nov 2022 register
    Connection date moved from 31 Oct 2022 to 1 Oct 2026 (+47 months)
  • 29 Nov 2022 register
    Technology changed from Biomass to Storage

Also at Pembroke 400kV Substation

Substation view

6 other projects, 1.5 GW still to connect at this substation in total. 300 MW is due to connect here before this project’s connection date of 7 Mar 2029.

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

Planning consent

The planning decision or stage for this project, from DESNZ’s Renewable Energy Planning Database (REPD), July 2026 edition, with the planning authority and its reference. QueueWatch matched the project to that record. NESO’s status can lag behind planning decisions, so the two may differ.

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