About the Project

The Peterhead 275/132kV substation is situated to the south of Peterhead, Aberdeenshire, on the opposite side of the A90 to the Peterhead power station, it is an integral and important part of SSEN Transmission’s network. The air insulated switchgear (AIS) indoor substation was constructed in circa 1975, approximately 1-mile inland from the North-East coastline. Some substation elements are located outdoors and thus subject to severe weathering.

The substation was initially constructed with two 275/132kV super grid transformers (SGTs). In 2010, a third SGT was installed to accommodate increased electrical load on the network.  

Three Super Grid Transformers (SGT1, SGT2 and SGT3) are connected between the 275kV and 132kV busbars. All three transformers are indoor units with freestanding radiators that are situated outdoors. SGT1 and SGT3 are housed within individual rooms that form part of the main substation building while SGT2 is housed in a separate standalone building.


Why is the project required?

The primary driver for this project is poor asset condition of the existing transformers SGT1 and SGT2, these SGTs are more than 45 years old and have reached the end of their operational capabilities.

In line with SSEN Transmission’s statutory obligation that we must develop and maintain an efficient, co-ordinated, and economical system of electricity transmission, we are proposing to replace SGT1 and SGT2 at Peterhead 275/132kV substation.

SSEN Transmission has a licence obligation to invest in its existing assets to maintain network health and condition. SSEN Transmission also has a statutory duty under the Electricity Safety, Quality and Continuity Regulations 2002 to ensure that the electricity transmission network is fit for purpose.

Our Community Engagement

Throughout the life of our projects, we aim to work positively with local communities and keep people informed about what we are doing. This is particularly important when we are developing a proposal and we want to understand what local people think about our plans.

We endeavour to take the time to discuss proposals with local community councils, encourage engagement from the wider community and listen to the feedback we receive.


We will do our best to answer any questions and address issues or concerns that are raised with us.

When our project progresses into construction, we will continue working closely with the local community to ensure that our work has as little impact on the lives of those living and working in the area and as many long term positive effects as possible.

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To make use of this function please click on the 'accessibility' button at the top right of the website. 

Who is Scottish and Southern Electricity Networks?

Scottish and Southern Electricity Networks is the trading name of Scottish and Southern Energy Power Distribution Limited, Scottish Hydro Electric Transmission plc, Scottish Hydro Electric Power Distribution plc and Southern Electric Power Distribution plc.

How are Transmission network upgrades paid for?

Investments in projects are made by SHE Transmission plc. Electricity transmission companies are authorised to recover the costs of such investments through 'use of system' charges which are levied by National Grid Electricity Transmission plc on generators and suppliers of electricity. Suppliers recover their costs from all electricity customers. In order to protect the interests of customers, the transmission companies have to demonstrate to the energy regulator, Ofgem (Office for Gas and Electricity Markets) that proposed investments are necessary, are efficient and are economical so that the charges which are ultimately levied on all electricity customers are justified.

This means SHE Transmission is subject to a funding mechanism established by Parliament and regulated by Ofgem. Cross subsidies between different businesses in the SSE group is not permitted.

How are proposals scrutinised?

The Scottish Ministers are responsible for determination of applications submitted under Section 37 of the Electricity Act 1989. Both statutory consultees and members of the public have the right to submit their representations on the application. All representations will be considered by Scottish Ministers in their determination of the application.
The Office for Gas and Electricity Markets (Ofgem), as the regulator, has to approve all investment so project proposals are developed under license conditions.
Preferred route corridors chosen will comply with revised ‘Holford Rules’ which are the recognised industry approach to routeing overhead lines amended to reflect Scottish circumstances.

What are The Holford Rules?

The Holford Rules originated in 1959 as the result of work by Lord Holford, a part-time member of the Central Electricity Generating Board (National Grid's predecessor). The Holford Rules have been augmented by both National Grid and SHE Transmission plc to reflect environmental legislation and best practice in recent years. We have continued to use them as a valuable set of guidelines for reducing the impact of our assets on landscapes.
The guidance recommends appropriate application of the Holford Rules to inform routeing. These rules advocate the application of a hierarchical approach to routeing which first avoids major areas of highest amenity, then smaller areas of high amenity, and finally considers factors such as backdrop, woodland and orientation. The Holford Rules apply the term ‘amenity’ to refer to environmental designations and classifications such as Natura 2000 sites, Sites of Special Scientific Interest (SSSI), Scheduled Monuments, Listed Buildings, National Parks.
The guidance also recognises that the key effect of overhead lines is visual and it advises that the routeing of overhead lines should consider the types of mitigation (screening) that could offset any visual effects.
In their National Policy Statement EN-5, the Government has stated that the Holford Rules “should be followed by developers when designing their proposals.” Their use is therefore Government policy, rather than a voluntary choice of SHE Transmission plc.

How and to what extent are electricity consumers' interests considered?

SHE Transmission are regulated by the Office for Gas and Electricity Markets (Ofgem), the regulator responsible for representing consumers' interests. Electricity consumer interests are therefore one of our key drivers and this is enshrined in our statutory duties under the Electricity Act.

In particular we have a statutory duty to develop, maintain and operate an efficient, economic and co-ordinated transmission system. Since the costs of these projects will ultimately be paid for by electricity consumers, we have a responsibility to take cost into account with due weighting in a comparison against other important factors.

What is the transmission network?

It’s the highest voltage electricity network in the UK – the ‘motorway network’ of the energy world. It transmits large quantities of electricity over long distances via wires carried on a system of mainly metal towers (pylons) and large substations. Transmission voltages in Scotland are 132kV, 275kV and 400kV. Larger generation schemes usually connect to the Transmission system.

The lower voltage parts of the system are called distribution networks. In Scotland, these local networks operate below 132kV whereas in England the distribution network includes 132kV. 

Feedback Period Closed

The feedback period following the recent public consultation events held in October is now closed. All responses received will now be reviewed ahead of submission of a planning application.

Feedback Period Open

The project team would like to extend thanks to all members of the public and interested parties who took the time to come along to our public consultation events that were held on the 27th of October and to those that visited our virtual online consultation and submitted questions to the team via the live text chat function on the 28th of October. We hope you found the consultations informative and beneficial. If you were unable to join any of the events, all the content that was presented on our proposals can be found within the project documentation tab of this website. We encourage those with an interest to share their views and feedback on our proposals by completing a feedback form. The feedback period is open until 3rd of December 2021.

SSEN Transmission Peterhead SGT Asset Replacement Project Consultation Booklet

Related Projects: Peterhead Super Grid Transformer Replacement

File Type: pdf
Published: 01 Nov 2021
SSEN Transmission - Peterhead SGT Asset Replacement Consultation Banners October 2021

Related Projects: Peterhead Super Grid Transformer Replacement

File Type: pdf
Published: 01 Nov 2021
SSEN Transmission - Peterhead SGT Asset Replacement Consultation Advert October 2021

Related Projects: Peterhead Super Grid Transformer Replacement

File Type: pdf
Published: 01 Nov 2021


Peterhead Super Grid Transformer Replacement Feedback Form October 2021

Peterhead Super Grid Transformer Replacement Feedback Form October 2021

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