The East Coast onshore 275kV upgrade is the first part of the phased onshore reinforcement on the East Coast. These onshore reinforcements comprise works on existing infrastructure in both the SSEN Transmission and Scottish Power Transmission (SPT) area, with the bulk of the works in the SSEN Transmission area.
The main advantage of a two-stage approach is that this allows for earlier delivery of increased capacity on the network in this region. This will also help resolve the issue of overloading and congestion on the transmission network.
The East Coast steel lattice towers and the overhead lines (OHLs) which they support are currently operating at 275kV. The projected growth in generation capacity within the SSEN Transmission area gives rise to increased north to south power transfer requirements and therefore the OHLs are required to transfer more power. As a result the conductors will operate at an elevated temperature. The elevated temperature can cause the conductors to sag. As a responsible operator we have modelled the future sag and under this project will undertake works to ensure the conductors remain within a safe clearance height.
The works required are termed as re-profiling works, where works such as vegetation clearance or changing of fittings on some towers, to raise the conductor will be undertaken. This will ensure safe clearance between the ground and the conductor is maintained.
A selection of photographs taken on site documenting the project construction progress of phase 1 which consists of overhead line works associated with the new Alyth substation that is currently in construction.
As part of its statutory and transmission licence obligations, SSEN Transmission has a number of duties including:
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.
The National Electricity Transmission System Security and Quality of Supply Standard (NETS SQSS) provides the deterministic criteria that SSEN Transmission must use to plan and design the transmission system. The criteria require that there are neither equipment overloads nor voltage violations under intact conditions. The criteria also require that there is no unacceptable overloading of any primary transmission equipment or unacceptable voltage conditions under planned or unplanned outage conditions.
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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The data in this map is provided for indicative purposes only and may be subject to change. Scottish Hydro Electric Transmission plc do not accept responsibility for its accuracy, completeness or validity. The data should not be copied, reproduced or utilised externally without permission.
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.
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.
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.
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.
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.
Related Projects: East Coast 275kV OHL Upgrade, East Coast 400kV OHL Upgrade
Related Projects: Alyth 275kV Substation & Reactive Compensation, East Coast 275kV OHL Upgrade, East Coast 400kV OHL Upgrade, Kintore 400kV Substation, North East 400kV, Peterhead Substation, New Deer Substation, Rothienorman Substation, Tealing Substation Extension
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