MSIP Reopeners

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to establish Windyhill 400kV Substation and uprate the Denny North – Lambhill – Windyhill 275kV circuit to 400kV operation.  The purpose of the project is to facilitate increased power transfer into and through the SPT network from renewable developments across the north of Scotland. These works are programmed to commence in the RIIO-T2 period (April 2021 – March 2026) and complete in 2029/30, during the RIIO-T3 period.

Integrating load and non-load related drivers in an economic, efficient and co-ordinated manner, it is proposed to proceed with a scope of works which will: (i) establish a new 400kV substation at Windyhill; (ii) uprate the existing Denny North – Lambhill – Windyhill 275kV circuit to 400kV operation; and (iii) modernise and maximise the capability of the existing XD overhead line route. The needs case for the development of the new 400kV substation at Windyhill including the uprating of the associated overhead line circuits and the factors that have an impact on the timing and scope of works are discussed.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: DLUP MSIP_Reopener

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to replace the phase conductor and earthwire on ZV route between Elvanfoot and the SPT/NGET border north of Harker with a High Temperature Low Sag (HTLS) conductor system, as part of a major refurbishment and uprating of this 400kV overhead line (OHL) route. The purpose of this project is to facilitate increased power transfer from Scotland to England via the thermal uprating of this strategic 400kV OHL route. The works are currently programmed to commence in the RIIO-T2 period and complete in 2030/31 (RIIO-T3)

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: MSIP Reopener SPT-RI 231 Elvanfoot Harker OHL Reinforcement

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to replace the phase conductor and earthwire on ZV route between Strathaven and Elvanfoot with a High Temperature Low Sag (HTLS) conductor system, as part of a major refurbishment and uprating of this 400kV overhead line (OHL) route. The purpose of this project is to facilitate increased power transfer from Scotland to England via the thermal uprating of this strategic 400kV OHL route. The works are currently programmed to commence in the RIIO-T2 period and complete in 2030/31 (RIIO-T3).

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: MSIP Reopener SPT-RI 1797 Strathaven to Elvanfoot OHL Uprating

This MSIP Re-opener application sets out SPT’s plans to carry out reinforcement work between Glenglass 132kV Substation and a new Glenmuckloch 132kV Substation within the RIIO-T2 and early RIIO-T3 periods. These works will extend the 132kV transmission network in southwest Scotland from Glenglass 132kV Substation to a new Glenmuckloch 132kV Substation, enabling the connection of 342 MW of contracted onshore wind generation.

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: Glenglass to Glenmuckloch 132kV OHL MSIP Reopener

This MSIP Re-opener submission sets out SP Transmission’s (SPT) plans to establish: (i) Redshaw 400kV Substation; (ii) Redshaw 132kV Substation (‘A’ Board); and (iii) Redshaw 400/132kV SGT2. This submission supports three discrete MSIP Re-opener applications. The purpose of these projects is to facilitate the connection of contracted onshore wind generation and Battery Energy Storage Systems. These works are programmed to commence in the RIIO-T2 period (April 2021 – March 2026) and complete in 2027/28, during the RIIO-T3 period.

Redshaw 400/132kV is a significant new 400kV/132kV substation development, utilising Gas Insulated Switchgear (GIS), in the South Lanarkshire area,  that will enable the connection of 1714MW of contracted generation development in the area between Coalburn and Elvanfoot, as well as the connection of a further 650MW of contracted renewable generation capacity in southwest Scotland. The needs case for the 400/132kV Substation development and the factors that have an impact on the timing and scope of works are discussed.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: Redshaw Cluster MSIP Reopener

This MSIP Re-opener application sets out SPT’s plans to establish Enoch Hill 132/33kV Substation  within the RIIO-T2 period, comprising: (i) the installation of a new 132kV feeder bay at New Cumnock 132kV Substation; (ii) an approximate 5km 132kV cable circuit from New Cumnock to Enoch Hill; and (iii) the establishment of Enoch Hill 132/33kV Substation, equipped with one 132/33kV 90MVA transformer. These works will enable the connection of 79MW of contracted wind generation.

In September 2023, Ofgem published its provisional decision on its first stage assessment of SPT’s MSIP Re-opener application, noting “we proposed to accept the initial needs case for the project and the preferred option presented by SPT in addressing the needs case”.

This document, which should be read in conjunction with the related  Stage 1 submission,  forms SPT’s Stage 2 application.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution, cost estimates, project delivery and outputs.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: SPT-RI-237 Enoch Hill MSIP Reopener Stage 2

This MSIP Re-opener application defines SP Transmission’s plans to extend the Anglo-Scottish Operational Intertrip Scheme (OTS), which is part of the SPT-NGET Interconnector Control Schemes (ICS) (a System Integrity Protect Scheme). This is in response to an STCP 16-1 Planning Request received from NGESO in respect of the B6 Constraint Management Pathfinder (CMP) 2024/25 initiative.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution, cost estimates, project delivery and outputs.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: CMP Phase 2 MSIP Reopener

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to establish Kincardine North 400kV Substation. The purpose of the project is to facilitate increased power transfer into and through the SPT network from renewable developments across the north of Scotland and enable the decommissioning of Longannet 275kV Substation, which is now approaching end of life. These works are programmed to commence in the RIIO-T2 period (April 2021 – March 2026) and complete in 2027/28, during the RIIO-T3 period.

Kincardine North is a significant new 400kV substation development, utilising Gas Insulated Switchgear (GIS), in the north-east of the SPT network, near Kincardine. The needs case for Kincardine North 400 kV Substation and the factors that have an impact on the timing and scope of works are discussed.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.

View our full application here: Kincardine North 400 kV Substation

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to establish Clyde’s Mill 400kV Substation. The purpose of the project is to facilitate increased power transfer into and through the SPT network from renewable developments across the north of Scotland. These works are programmed to commence in the RIIO-T2 period (April 2021 – March 2026) and complete in 2027/28, during the RIIO-T3 period.

It is proposed to establish Clyde’s Mill 400kV Substation in a ‘three switch’ configuration, utilising Air Insulated Switchgear (AIS). The proposed development will help to ensure the network is ready for the changes required by Net Zero targets. The proposed configuration will enable the future establishment of a 400kV single circuit connection from Clyde’s Mill to Strathaven 400kV Substation (ref. NOA code CVUP). The needs case for the development of Clyde’s Mill 400kV Substation and the factors that have an impact on the timing and scope of works are discussed.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity. .

View our full application here: Kincardine-Wishaw (Clyde’s Mill) 400 kV Reinforcement

This MSIP Re-opener application sets out SP Transmission’s (SPT) plans to replace the phase conductors on XH and XJ routes with a High Temperature Low Sag (HTLS) conductor system, as part of the major refurbishment of these 400kV overhead line (OHL) routes. The purpose of this project is to facilitate increased power transfer from Scotland to England and ensure timely modernisation of two strategic 400kV OHL routes. The works are programmed to commence in the RIIO-T2 period and complete in 2027/28 (RIIO-T3).

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.

View our full application here: XH/XJ Routes Overhead Line Uprating Works

This MSIP Re-opener application sets out SPT’s plans to carry out reinforcement work at Coalburn 400/132kV Substation within the RIIO-T2 period (April 2021 – March 2026), comprising reconfiguration works and the installation of a fourth Supergrid Transformer (SGT), increasing the substation capacity and enabling the connection of 288MW of contracted onshore wind generation.

In April 2022 Ofgem published its provisional decision on its first stage assessment of SPT’s MSIP Re-opener application, noting “the installation of a fourth 360MVA Supergrid Transformer (SGT) and the subsequent substation works represent the optimal option for the consumers”.

This document, which should be read in conjunction with the related Stage 1 submission, forms SPT’s Stage 2 application.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution, cost estimates, project delivery and outputs.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.

View our full application here: Coalburn SGT4

This MSIP Re-opener application sets out SPT’s plans to carry out reinforcement work under SPT-RI-302 at Glenglass 132kV Substation within the RIIO-T2 period (April 2021 – March 2026). These works comprise the establishment of a new 132kV Substation utilising Gas Insulated Switchgear (GIS) and the reinforcement of 132kV underground cables at Blackhill 132kV Substation. The establishment of a new 132kV GIS substation at Glenglass will facilitate the connection of new renewable generation and the future extension of the south west Scotland 132kV network.

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.

View our full application here: Glenglass 132kV Substation

This MSIP Re-opener application sets out SPT’s plans to establish Enoch Hill 132/33kV Substation within the RIIO-T2 period, comprising: (i) the installation of a new 132kV feeder bay at New Cumnock 132kV Substation; (ii) an approximate 5km 132kV cable circuit from New Cumnock to Enoch Hill; and (iii) the establishment of Enoch Hill 132/33kV Substation, equipped with one 132/33kV 90MVA transformer. These works will enable the connection of 79MW of contracted wind generation.

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.

View our full application here: Enoch Hill Collector Substation and Associated 132kV Circuit

This MSIP Re-opener application defines SP Transmission’s plans to develop the Anglo-Scottish Operational Intertrip (OTS) and Line End Open (LEO) components of the SPT-NGET Interconnector Control Schemes (a System Integrity Protection Scheme). This is in response to an STCP 16-1 Planning Request received from National Grid ESO in respect of their B6 Constraint Management Pathfinder initiative.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution, cost estimates, project delivery and outputs.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity.  

View our full application here: Constraint Management Pathfinder: LEO and OTS Modifications

This MSIP Re-opener application defines SP Transmission’s (SPT) project to develop the Wishaw - Eccles - Torness - Smeaton Operational Intertrip Scheme component of the SPT-NGET Interconnector Control Schemes (a System Integrity Protection Scheme). This is in response to an STCP 16-1 Planning Request received from National Grid ESO.

Full justification for the preferred investment option is presented, together with a detailed description of the proposed solution, cost estimates, project delivery and outputs.

Redactions have been made for this published re-opener application due to the sensitivity of the content as it includes confidential information with commercial sensitivity. .

View our full application here: Wishaw-Eccles-Torness-Smeaton operational Intertrip Scheme

This MSIP Re-opener application sets out SP Transmission’s plans to establish Branxton 400kV Substation, with works commencing in the RIIO-T2 period (April 2021 – March 2026) and commissioning programmed in 2026/27, during the RIIO-T3 period.

Branxton is a significant new 400kV substation development, utilising Gas Insulated Switchgear (GIS), on the eastern side of the SP Transmission (SPT) network, near Torness. Its purpose is to enable the timely and co-ordinated connection of the 2,000MW Eastern HVDC Link to the north east of England.

The needs case for Branxton 400kV Substation and the factors that have an impact on the timing and scope of works are discussed. Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

View our full application here: Branxton 400kV Substation

This MSIP Re-opener application sets out SPT’s plans to carry out reinforcement work at Coalburn 400/132kV Substation within the RIIO-T2 period (April 2021 – March 2026), comprising reconfiguration works and the installation of a fourth Supergrid Transformer (SGT), increasing the substation capacity and enabling the connection of 274MW of contracted onshore wind generation.

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

View our full application here: Coalburn SGT4 Installation

This MSIP Re-opener application sets out SP Transmission’s plans to carry out infrastructure work at Cockenzie 275kV Substation, within the RIIO-T2 period (April 2021 – March 2026), required to enable the connection of the 1,080MW Inch Cape Offshore Wind Farm.

Full justification for the preferred investment option is presented within this MSIP Re-opener application document, together with a detailed description of the proposed solution.

View our full application here: Inch Cape Offshore Wind Farm