From: Amanda Manns To: Triton Knoll Electrical System Cc: Mandy Wood Subject: 151027 EN020019 Lincolnshire County Council response to National Grid Viking Link representations Date: 27 October 2015 16:19:27 Attachments: image001.png LCC presentation.pdf 00033 - Viking Link 271015.pdf
Good afternoon,
Please find attached a letter in response to representations from yourselves dated 08 October 2015 along with a powerpoint presentation.
Kind regards, Amanda
Amanda Manns Management Support Officer to Steve Willis (Chief Operating Officer, Development Services) Lincolnshire County Council Environment and Economy Directorate Unit 7 Witham Park House Waterside South LINCOLN LN5 7JN [email protected] 01522 553002
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Parties – Who are Viking Link
• Viking Link is a joint project being developed by National Grid Interconnector Holdings Limited, together with its development partner Energinet.dk.
• Energinet.dk own, operate and develop the Danish electricity and gas transmission systems. It owns and operates several interconnectors between Denmark and other countries since 1965.
• National Grid Interconnector Holdings Limited is a wholly owned subsidiary of National Grid plc. This is a separate organisation to National Grid Electricity Transmission Limited who have the license to own and operate the High Voltage Electricity Transmission System in England and Wales since 1986.
Background • Viking Link project development initiated November 2013 through a cooperation agreement signed between ENDK and NG.
• Initial Feasibility studies undertaken in 2014 to feed into application for UK regulatory regime - Near Term Interconnector Project (NTIP) Status. The project is under IPA assessment following a positive eligibility assessment in November 2014.
• Initial studies identified a capacity range of 1000MW to 1400MW as feasible technically, however requiring a possible increase of reserve capacity in Danish Network – currently 700MW.
• The project partners have identified a 1400MW capacity as the preferred option and are considering a 2 x 700MW configuration. What is an Electrical Interconnector
An Electrical interconnector is a connection between two different electrical systems Due to the distance involved to Denmark this will require the use of High Voltage Direct Current (HVDC) technology. The power is carried over one pair of cables, each one approximately 125mm in diameter
Consenting Approach
Viking Link is seeking to obtain consents as follows:
Marine : UK : MMO Dutch : RWS German : BfN Danish: Energy Ministry
GB onshore: T&C Planning Permission from Local Planning Authorities
The Project is a candidate Project of Common Interest (PCI) and if granted the TEN-E regulations would apply. Marine route options Updated Routing UK Onshore
Viking Link has conducted environmental constraint mapping focussed on the Bicker Fen connection and identified: a. Prospective landing site options b. Potential cable corridor options c. Potential converter site location options
We would like to discuss these options towards identifying a preferred solution, balancing offshore and onshore aspects. Siting HVDC Converter: 2 Cables or 6
Conversion AC – DC
2 or 3 HV DC 6 HV AC Cables Cables AC DC Sub- Converter station Bicker Fen GB Draft Converter Site Options GB Draft Converter Site Options Agricultural Land Classification Option Review
• How do we progress analysis across all LPA areas?
Suggested criteria to use. What are priorities – analysis treatment/Weighting? • Local Policies • Existing Infrastructure • Flood Zone • Visual – A large building – treatment – Feature / Blend/ Screen? • Proximity to residential housing / noise impact.? • Access requirements : Road Traffic – Construction, Operation? • Cable routes? • Agricultural Land category?
Consultation approach • Stakeholder Engagement PPA or similar. Transformer Access Landfall options
Need to progress comparisons and arrive at a documented analysis and identification of preferences.
Consultants being appointed to progress works
Seeking Input towards identifying preference. GB Landfall options GB Landfall options GB Landfall options Site Landings Comparison
Summary
Landfall Combined score Rank
N1 A Sandilands 22 4
N1 B Huttoft Car Terrace 24 2
N1CMarshYard 25 1
N1 D Moggs Eye 24 2
N2 Anderby Creek (south of main drain) 17 5
N3 Chapel St Leonards (Lakeside Leisure) 16 6
N4Winthorp 0 7 Triton Knoll Landing Cable Route
Viking Link has been asked to explore opportunities to follow the same cable route as that being proposed by Triton Knoll
A report is being prepared that address's the issues which need to be considered.
Key considerations include: • Separation requirements • Different Consenting regimes • Different Regulatory treatment • Programmes • Practicalities • Commercial
• Conclusion that Viking Link and Triton Knoll unable to share route. Draft Cable Route - Section GB Draft Cable Route Options Identifying Cable Route
Ideal Sequence
Identify preferred landing Site Identify preferred Converter site Basis for identifying cable route
Other Factors • Marine Route constraints • Access routes • Impact of Triton Knoll route. • Drainage • Impact of Electrode connection • Feedback from Consultation Impact of Electrode :
The project is seeking to maximise the benefits of the connection by achieving a 1400MW connection.
The Danish system has a constraint that the maximum loss it can withstand for a single event is 700MW. (In GB this value is 1800MW)
To achieve this, a design option is to introduce an ‘electrode’ which would only operate intermittently following a fault on the interconnector. By doing so the impact of a fault is limited to 50% of the interconnector capacity, satisfying the Danish operating requirements. Electrode Location and Impacts
The Electrode comprises an array of buried conductors . This can be located onshore, in a beach or intertidal area, or offshore. Depending on the location impacts will vary.
Initial Studies have identified a suggested location SW of Gibraltar Point
Studies are continuing to quantify the environmental impacts.
Cable route required to connect Converter Station to Electrode
Impacts of electrode operation
EMF Current only flows in one conductor so not cancelled by flow in return conductor. Magnetic Field increases along route and cable to electrode location. Field generated around electrode location Magnetic compass deviation Rise in Earth Potential at Electrode Electrolysis in sea water locations
3rd Party Infrastructure : Current flow Draft Electrode Location Electrode – Rise of Earth Potential
DC Electrode AC Power Systems Fault durations Majority of events Voltage Max Duration Max Curre
1.4kA 2 seconds LV/11kV 3 seconds 20kA
Voltage rise ~95V 132kV 1 second 31kA
400kV 0.5 seconds 63kA Existing Electrode – in Denmark Electrode – Above Ground Equipment Consultation to date
Initial options used to undertake initial consultation with:
• Local Authorities .
• German Federal Maritime and Hydrographic Agency (BSH)
• Netherlands Dutch Ministry of Infrastructure and the Environment Rijkswaterstaat (RWS)
• Marine Management Organisation (MMO)
• Triton Knoll
• Hornsea Wind Farm – Dong Energy and SMartWind
• Environment Agency
• Natural England Viking Link - Approach and Timetable
• Viking Link aims to obtain Planning Permission for overall onshore works from the range of Local Planning Authorities
• Candidate PCI Project.
• Viking Link are undertaking site constraints analysis and aim to come forward with options for consultation, initially with statutory bodies, then the general public.
• High level Timetable:
• Consultation, identify site preferences and EIA 2015/16
• Submit Planning Applications 2016/17
• Obtain Consent & Award Contracts 2017.
• Completion and Enter Operation 2020.