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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 / South Scotland

Coalburn Battery Energy Storage Facility

ALCEMI STORAGE DEVELOPMENTS 4 LIMITED at Coalburn 400kV Substation

Connection date
Connected
Gate
Gate 2
Status
Built
Planning consent
Granted 7 Jun 2023
Scottish Government (S36), reference ECU00003458 · Source: REPD
Technology
Storage
Total capacity
500 MW
Connected now
500 MW
Still to connect
0 MW
Transmission owner
SP Energy Networks (SPT)
Agreement type
Direct Connection
Region
South Scotland
Project number
PRO-001459
In the register since
March 2021

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.

  • 3 Jul 2026 register
    Connection date removed (was 12 Jun 2026)
  • 30 Jun 2026 register
    500 MW now connected
  • 30 Jun 2026 register
    Connection date moved from 3 Apr 2026 to 12 Jun 2026
  • 30 Jun 2026 register
    Status changed from Scoping to Built
  • 19 Jun 2026 register
    Connection date moved from 31 Oct 2025 to 3 Apr 2026 (+5 months)
  • 19 Jun 2026 register
    Given a Gate 2 connection offer
  • 23 Dec 2025 register
    Renamed from Coalburn Battery Energy Storage Facilityy
  • 19 Dec 2025 register
    Renamed from Alcemi Coalburn Battery Energy Storage Facility
  • 19 Dec 2025 register
    Connection point changed from Whitburn 400kV substation to Coalburn 400kV Substation
  • 30 Sep 2025 register
    Connection point changed from Coalburn 400kV GIS Substation to Whitburn 400kV substation
  • 30 Mar 2021 register
    Added to the register

Also at Coalburn 400kV Substation

Substation view

No other projects in the register at this connection point.

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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