Offshore grid NL. Hollandse Kust (noord) & Hollandse Kust (west Alpha) General project introduction. 14 september 2018

Transcription

1 1 Offshore grid NL Hollandse Kust (noord) & Hollandse Kust (west Alpha) General project introduction 14 september 2018

2 Offshore grid developer Four wind areas of 700 MW Planning of the Energy Agreement Future proof Minimal habitat disturbance Standardisation 2

3 Offshore grid developer Four wind areas of 700 MW Planning of the Energy Agreement Future proof Minimal habitat disturbance Standardisation HKWb HKWa HKN Subsidy tender in Areas Routekaart Wind Operational in power 2019 Hollandse Kust (noord) 700 MW Hollandse Kust (west Alpha) 700 MW Hollandse Kust (west Beta) 700 MW Ten Noorden van de Wadden (TNW) 700 MW

4 Overview designated wind farm zones Foreseen Wind farm zones within Qualification system: Wind farm zone B: Hollandse Kust (noord) Wind Farm Zone D: Hollandse Kust (west Alpha) Hollandse Kust (west Beta) Ten Noorden van de Waddeneilanden Note 1. IJmuiden Ver is not in the scope of the Qualification system. Note 2. Borssele and HKZ have been Tendered. 4

5 Offshore grid scheme AC platforms Safety Standardization Lean Design Future proof Contribution to lowest possible LCOE Inter-array cables 220 kv cables TenneT existing onshoregrid Highvoltage grid Substation Dunes Extension Seacables 5

6 Scope: offshore part Cable system length noord 220 kv: west Alpha 220 kv: The cable routes for HKW Beta and TNW are under development 2 x 35 km offshore 2 x 2,5 km onshore 2 x 70 km offshore 2 x 2,5 km onshore The route length of noord most likely allows for compensation of reactive power from one side only (land side). The route length of west Alpha will most likely require reactive power compensation from both sides. 6

7 Scope: onshore part Transition joint sea cable land cable Cross-bonding joint 1 HDD 1 Cross-bonding joint 2 HDD 2 AIS terminations at Land station HDD 3 7

8 Scope: installation challenges 1. Soil a) Predominantly sand, mostly mobile b) Nearshore some stiffer clays expected 2. Mobile Sand Waves a) Up to approx. 4 meter in height b) pre sweeping (dredging) and/or deep trenching required 3. Burial depths a) Nearshore (up to 2 3 km from shoreline): 5 8 meter below seabed b) Offshore (2 3 km from shoreline and further): 1 2 meter below Non Mobile Reference Level 4. Crossings (approx.) a) 30 with In Service Telcom cables b) 8 with In Service pipe lines c) 2 Out Of Service cables to be cleared 5. Obstacles a) Some wrecks b) Remains from oil and gas activities c) Other maggy contacts Reference level for burial below mobile seabed features Burial requirement Mobile seabed features as Sand Waves and Mega Ripples 8

9 Scope: installation challenges 6. Route engineering: a) Through sand waves: by TenneT b) To avoid obstacles: by Contractor 7. Jointing pit on the beach with transition to land cables a) Burial depth 6 8 meter b) Beach erosion to be taken into account 8. Pull in to platform a) Pull in winch part of contract b) Cable protection around the platform up to 9 m/s 1:100 year currents 9. To be prepared for the Tender (amongst others): a) Burial Assessment Study based on specific requirements b) Workability P50/P90 estimations based on specific requirements 9

10 Planning HKN / HKWa Q Start Tender (ITT) Sea Cable Contract Q Award Sea Cable Contract Start construction Hollandse Kust (noord) Q Hollandse Kust (noord) Ready Q Hollandse Kust (west Alpha) Ready Q Permits irrevocable 2022 Sea Cable & Platform Installation Hollandse Kust (noord) 2023 Sea Cable & Platform Installation Hollandse (west Alpha) 10

11 Sea cable - ITT Expected technical documents as part of the ITT: 1. Survey data a) Bathymetry, geotechnical, geophysical b) Assessment of thermal resistivity's (G values) for cable design 2. Metocean dataset 3. Depth of Burial requirements a) Non Mobile Reference Level b) Seabed Mobility Study c) Risk Based Burial Depth study 4. UXO Desk Top Study conform WSCS-OCE 5. Drawings of the HDD s Execution of landside installation (e.g. the HDD s) are out of HKN HKWa scope 6. The supply of the land cable Approx. 2,5 km 220 kv (4 x 3) e.g. assembly of accessories is within the HKN HKWa scope 7. Onshore civil works Execution of HDD s, and land cable laying / pull in is out of HKN HKWa scope 11

12 Summary Offshore grid connection program: On schedule Standardised approach To be tendered from Q Hollandse Kust (noord) & Hollandse Kust (west Alpha): Platforms will be 700 MW each HKN to be completed in 2023; HKW Alpha to be completed in 2024 Two cable circuits per platform, each 350 MW / 220 kv AC Hollandse Kust (west Beta) (HKWb) and Ten Noorden van de Waddeneilanden (TNW) will be tendered at a later stage 12

13 22 Disclaimer Liability and copyright of TenneT This PowerPoint presentation is offered to you by TenneT TSO B.V. ('TenneT'). The content of the presentation including all texts, images and audio fragments is protected by copyright laws. No part of the content of the PowerPoint presentation may be copied, unless TenneT has expressly offered possibilities to do so, and no changes whatsoever may be made to the content. TenneT endeavours to ensure the provision of correct and up-to-date information, but makes no representations regarding correctness, accuracy or completeness. TenneT declines any and all liability for any (alleged) damage arising from this PowerPoint presentation and for any consequences of activities undertaken on the strength of data or information contained therein.

14 23 TenneT is Europe s first cross-border grid operator for electricity. With about 21,000 kilometers of (extra) high-voltage lines and 41 million end-users in the Netherlands and Germany, we rank among the top five grid operators in Europe. Our focus is to develop a North-west European energy market and to integrate renewable energy. Taking power further