Rannoch substation has delivered locally-generated hydro electricity to residents in the north of Scotland since the 1930s. Almost 90 years on, we have extended the substation to facilitate new hydro generation connections and improve the security of supply for the area.
The upgrade consisted of several key elements:
• Establishment of a site compound and welfare facilities for project staff
• Construction of an aggregate platform and concrete bases to support electrical infrastructure
• Minor changes to existing terminal tower
• Construction of a new control building to house electrical switchgear
• Implementation of screening plans and realignment of an access track
• Construction of one wood pole span from existing terminal tower
• Delivery of two new grid transformers and two new primary transformers
• Dismantling and removal of existing substation equipment
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.
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.
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.
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