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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.

More analyses are on the way.

Transmission / Projects / England and Wales

MARCHWOOD ENERGY STORAGE

BW ESS DEVELOPMENT UK LIMITED at Marchwood 400kV Substation

Connection date
1 Jun 2028
Gate
Gate 1
Status
Scoping
Planning consent
Granted 13 Nov 2025
New Forest, reference 25/10639 · Source: REPD
Technology
Storage
Total capacity
200 MW
Connected now
0 MW
Still to connect
200 MW
Transmission owner
National Grid Electricity Transmission (NGET)
Agreement type
Direct Connection
Region
England and Wales
Project number
PRO-002190
In the register since
November 2022

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.

  • 5 May 2026 register
    Marked as Gate 1
  • 29 Jul 2025 register
    Connection date moved from 31 Oct 2027 to 1 Jun 2028 (+7 months)
  • 31 Jan 2025 register
    Customer changed from Penso Power Limited to BW ESS DEVELOPMENT UK LIMITED
  • 27 Aug 2024 register
    Restructured from 1 stage (200 MW from 14 Nov 2031) to 1 stage (200 MW from 31 Oct 2027). First connection date −48 months
  • 23 Dec 2022 register
    Substation name updated in the register (from Marchwood 400kV to Marchwood 400kV Substation)
  • 29 Nov 2022 register
    Added to the register

Also at Marchwood 400kV Substation

Substation view

1 other project, 200 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

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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