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Update on Hinkley Point Pylon Project
Following the public meeting held on 27th November Dr Fox promised to write again to the National Grid to raise a number of concerns and questions relating to the various options available for the routing.
The original letter from Dr Fox is available below (Item 1).
He has now received a response which you can view below (item 2).
Dr Fox is concerned that the National Grid have not provided a sufficient justification as to why they rejected the non-pylon alternatives.
Dr Fox is very keen to get public response to this letter. If you have further comments please put your views on paper and send them to the address below:
Dr Liam Fox MP
House of Commons
London
SW1A 0AA
December 2009
ITEM 1
Dear Mr Mercer
Firstly, I would like to thank you and your colleagues for taking the time to attend our public meeting in Nailsea last Friday. I am sure you will agree it was a very measured meeting, although the strength of feeling was extremely clear. There were a number of issues raised, which I promised to take up with you.
As I said at the meeting, the costs of the pylon replacement scheme need to be measured in more than simply monetary terms – the quality of life of our local environment has a value too. We therefore need more information about genuine alternatives, rather than simply a choice between two different corridors (one of which is so horrendous and would represent such environmental vandalism that it could never be a really viable option).
As you saw, there was considerable interest in the issues of undergrounding cables or having them under water. There was a huge appetite for more detailed costings about these and more information on the technical issues, albeit in language designed for a lay audience.
Could you tell me in detail what is different about the Neptune Project and other underwater projects, which make them so radically different from a project in the Severn Estuary? Could you give us costings on similar projects to take cables underground where there are large population centres? One of the most surprising answers that we received at the meeting was that the difference to electricity consumers from a pylon project cost of £90 million and an underwater or underground programme of over £500 million would be only around one per cent on electricity bills. More information on this relationship would be very useful.
I would also be grateful if you provide us with evidence on the superconductor idea and how technology in this area could take us into supply for the 21st century. I would also find it very useful if you could give estimates not only of the initial cost but of the through life cost for the various options.
Finally, as we are well into the consultation period and with Christmas approaching, we need time to look at all these options and all this information. I think it would be a very good seasonal gesture to extend the consultation period so that a good decision can be reached, rather than simply a quick one.
On a personal note, as I said at the meeting, I find it outrageous that the current government’s legislation has resulted in a situation where the IPC is not answerable to a Secretary of State. The lack of democratic accountability in this whole process is wholly unacceptable and it is an area that a Conservative government would wish to change.
Thank you once again for taking the trouble to come to Nailsea and I look forward to your reply in due course.
Yours sincerely
LIAM FOX
ITEM 2
Dr Liam Fox MP
High Voltage Direct Current (HVDC) technology is also used around the world in special circumstances; typically where very long connections are required (hundreds of kilometres) and to provide interconnections between different AC transmission systems, such as our own interconnector with France.
HVDC systems use direct current, either through overhead lines or underground and subsea cables,to transfer power. Convertor stations are required at either end to interface with existing AC networks. Convertor stations are extremely expensive and as a consequence HVDC. using overhead lines as the transmission medium, only becomes economic over very long distances. Where the transmission medium is underground or subsea, HVDC systems can be economic at much shorter distances but only when compared against an equivalent AC underground or subsea connection, not compared with an AC overhead line.
The Neptune Project connects Long Island with the mainland, has a capacity of around 660MW and cost in the region of $650m. The urban nature of the New York/Long Island area would have prevented an on-shore overhead connection and justified the high cost of a subsea HVDC connection. The Neptune cable allows Long Island Power Authority to purchase electricity from outside the area.An HVDC connection in the Severn Estuary would need to be rated at around 4000MW and we estimate would cost in excess of £1 bn more than an AC overhead line connection. Any HVDC connection in the Severn Estuary would in addition have its own environmental, technical and engineering difficulties and would require multiple cable connections.
As I explained at the meeting, the cost of either a subsea or underground cable on this connection would result in only a very small increase in charges to consumers. This connection is however just one part of the very major capital programme of works National Grid has across its networks, and this in turn is part of an even larger investment across the UK's energy networks as a whole. This investment is vital to the UK achieving its targets to move towards achieving a low carbon economy, and includes the connection of new renewable and new nuclear electricity generating capacity.
National Grid's approach of using overhead lines to provide transmission connections has been accepted by the Secretary of State in granting consent for a number of overhead lines over the last 15 years, including the Seabank Power Station connection to the north of Bristol. More recently on 2 December 2009 the Secretary of State granted consent for a new 21 km 400kV overhead line in County Durham.
National Grid works closely with manufacturers and other utilities on the development and application of new technology. Superconducting cable technology may in time develop to present a practical and economic solution but currently, to our knowledge, there is no practical installation of any significant scale commercially operational.
I hope this reply is helpful. I would emphasise that we are committed to effective consultation with Hinkley Point 'c' Connection.
Thank you for your letter dated 3 December 2009. I hope the local community found the public
meeting on 27 November a useful addition to our consultation programme. We fully understand the strength of feeling of the community and I hope the answers we provided were helpful.
I attach a copy of our detailed optioneering report which was made available on our website on 7 December. This report sets out details of all the connections options considered, and the methodology by which we arrived at the proposed system reinforcements necessary to connect Hinkley Point C, including any potential for subsea cables as an alternative to new on-shore power lines.
The report concluded that the option which provided on balance the most appropriate solution would be to construct a new 400kV overhead power line between Bridgwater and Sea bank substation in Avonmouth, and our current public consultation exercise is seeking feedback from local communities on two possible route corridors for this line. This consultation will close on 08 January 2010, after which we will consider all feedback and comments received. We will then determine a preferred route corridor and carry out a further public consultation on a proposed route alignment within that corridor to ensure local people have every opportunity to give us their views. Of course, we will be happy to answer questions about the optioneering process and the project as a whole throughout this period.
In your letter you refer specifically to the Long Island Neptune Project and I hope the following comments are helpful.
The transmission network in the UK, in common with most other nations, uses high voltage alternating current (AC) power lines as the means of transporting electricity. Overhead lines are used wherepossible, with underground cables being used more frequently in built-up areas. Underground cables cost around 12 to 17 times as much as overhead lines, and therefore we reserve consideration fortheir use to built-up areas where it is not possible to achieve an overhead route, and areas designated for their very high amenity value such as National Parks.
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