PROPOSED 400kV SUBSTATION AND EASTERN HVDC LINK

Transcription

1 PROPOSED 400kV SUBSTATION AND EASTERN HVDC LINK BACKGROUND The European Union has set a target that 15% of Europe s energy requirements shall be met from renewable resources by The UK Government s contribution towards this target is to achieve 15% energy consumption from renewable sources by this date. In order for these targets to be met Scottish Hydro Electric Transmission Ltd (SHETL) is required to upgrade its network to enable new renewable generation to connect in the north of Scotland. ration Capacity [MW] Total Gene Tidal Wave Offshore Wind Onshore Wind Hydro CHP Pumped Storage CCGT FORECAST SHETL GENERATION PROFILE

2 HVDC LINK SCHEMATIC THE EXISTING TRANSMISSION SYSTEM At present the electricity transmission system between Scotland and England is operating at capacity via two cross-border 400kV transmission lines. The amount of power that needs to be moved across this part of the system continues to grow and will exceed current capacity. SHETL and NGET are accordingly proposing the development of an Eastern High Voltage Direct Current (HVDC) Link between Scotland and England in the form of buried subsea cable. The Eastern HVDC link will increase the electricity transmission capacity between the north and the south of the UK by approximately 2 GW. It will use Direct Current (DC) technology to reinforce the existing UK transmission system. DC electricity is created and transmitted by converting conventional Alternating Current (AC) electricity into DC electricity at a converter station for onwards transmission at high voltages. At the other end of the high voltage cable, DC electricity is converted back to AC electricity at a second converter station and then transmitted through the AC system for onwards distribution to homes and businesses.

3 POTENTIAL REGIONAL CONNECTIONS PETERHEAD REVIEW

4 PETERHEAD AREA OPTIONS

5 PREFERRED SITE - LAYOUT OPTION 1 Potential 400kV Substation Potential Converter Station Existing 275kV Substation Indicative visualisation from the east

6 PREFERRED SITE - LAYOUT OPTION 2 Potential 400kV Substation Existing 275kV Substation Potential Converter Station Indicative visualisation from the east

7 PREFERRED SITE - LAYOUT OPTION 3 Potential 400kV Substation Existing 275kV Substation Potential Converter Station Indicative visualisation from the east

8 PREFERRED SITE - LAYOUT OPTION 4 Potential 400kV Substation Existing 275kV Substation Potential Converter Station Indicative visualisation from the east

9 MARINE CORRIDOR ASSESSMENT Fishing activity Geology Other constraints Wrecks

10 PROPOSED 2012 MARINE SURVEY CORRIDOR Near shore survey vessel - Ping Peterhead near shore survey corridor Offshore survey vessel - Franklin

11 MARINE SURVEY DETAILS Survey Equipment 1 - GPS positioning 2 - Underwater positioning of equipment USBL (ultra short base line) 3 - Multibeam Echo sounder (MBES) uses multiple echo sounding beams to create a topographical map of the seabed 4 - Sub bottom profiler (surface towed Sparker system) Used to chart the layers below the seabed detects t changes in sediment ttype, rock etc. 5 - Inspection ROV Remotely Operated Vehicle used to take photographs and video of the seabed 6 - ROTV Remotely Operated Towed Vehicle can be programmed to follow the survey lines with high accuracy since it has rudders used for steering. In general mounted with Side Scan Sonar (SSS) and Sub bottom profiler (SBP) normally a Chirp system. The SSS is used to create mosaics (wide images) of the seabed, seabed interpretation i.e. sediment classification and objects identification e.g. boulders, depressions, wrecks etc. The SBP used to chart the layers below the seabed detects changes in sediment type, rock etc. 7 - Magnetometer used to measure magnetic fields. Identifies magnetic anomalies and metallic objects e.g. wrecks, pipes and cables 8 - Work class ROV can be equipped with instruments for cable detection/tracking, UXO search, not used in this project 9 - Grab sampler takes samples of sediment from seabed surface for ground truthing Vibrocorer a 3m 6m long core supported by a frame to balance on the seabed. An electric motor vibrates the core into the seabed to recover a sample to analyse sediment type and to ground truth the interpretation of MBES, SSS & SBP electronic data. The sample is tested for shear strength (i.e. the suitability of burial methods and the ability of the sediment to support the cable) and thermal resistivity (i.e. the sediments ability to dissipate heat from the cable) The extent of vibro coring will depend on the results of the geophysical survey. However it is anticipated that approximately 170 vibro cores may be taken during this survey.

12 POTENTIAL SCHEDULE Subject to consent and funding the proposed completion date for the Eastern HVDC Link is However, the 400kV substation will be required by 2016 for connecting offshore renewables into the transmission system at Peterhead. The existing 275kV overhead line between Peterhead and Rothienorman will also be reinforced to 400kV by replacement of the overhead line insulators and replacement of the earthwire by The Eastern HVDC Link would subsequently utilise this 400kV substation following the completion of the HVDC Converter station in PURPOSE OF CONSULTATION The primary purpose of this Consultation Event is to disclose the work undertaken to date to refine options for the construction and operation of the 400kV Substation and Eastern HVDC link in the Peterhead area. It is SHETL s intention to seek feedback from key consultees at an early stage so that the potential works can be appropriately informed. Any comments in respect of the project would be welcomed. Please take the time to fill out one of the comment forms and either leave it at the event or send to: Any comments in respect of the project would be welcomed. Please take the time to fill out one of the comment forms and either leave it at the event or send to: Onshore: Offshore: Deborah Bowie - Community Liaison Manager Scottish Hydro Electric Transmission Limited 1 Waterloo Street, Glasgow, G2 6AY, UK T: +44 (0) E: deborah.bowie@sse.com Matthew Barnette - Environmental Project Manager Scottish Hydro Electric Transmission Limited Inveralmond House, 200 Dunkeld Road, Perth, PH1 3AQ, UK T: +44 (0) E: matthew.barnette@sse.com Additional information can be found at: All comments received will be considered during the decision making process to finalise the proposed option on which voluntary environmental appraisal and consent applications may be made.