MEMORANDUM
FROM
Offshore Grid NL Sea Cable
DATE
TO
Potential Candidates
REFERENCE
October, 2015
STATUS
Final
CLASSIFICATION
For TED publication
SUBJECT :
Qualification System for HVAC Sea Cable & Installation for 5 offshore area's in the
North Sea
Index
1. PROJECT BACKGROUND AND INTRODUCTION..................................................................................... 2
2. SEA CABLE TENDER(S) ............................................................................................................................. 4
2.1 Tender strategy for Sea Cable ............................................................................................................ 4
2.2 Scope for Sea Cable ........................................................................................................................... 5
2.3 Project Planning .................................................................................................................................. 7
2.4 Tender Planning.................................................................................................................................. 7
Appendix : Indicative planning schedule for Offshore Grid NL program.
Document History and status
Version
Date
Description
1.0
17.10.2015
Updated from Pre-announcement Document
1.1
20.10.2015
For TED publication
TenneT TSO B.V.
DATE
October 2015
PAGE
2 of 8
1. Project Background and Introduction
In July 2015 the law wind energy at sea ("Windenergie op Zee") is approved, which intends to scale-up wind
energy in the Dutch North Sea with 3450 MW as part of the overall goal of achieving 16% renewable energy
by 2023
The roll-out strategy of the Ministry of Economic Affairs of September 2014 has indicated that wind area
Borssele is the first area to be developed. If this fist concession is awarded successfully 4 more wind areas
are intended to follow.
Figure 1-1 Foreseen wind park development areas
For more information reference is made to the publication of the Netherland Enterpise Agency
(http://offshorewind.rvo.nl/generalborssele)
TenneT will be made responsible for the planning, design, construction, and operation of the offshore and
onshore connection of each of these wind area's to the onshore high voltage grid of TenneT.
Rationale for this as presented to the house of representatives is the anticipated 40% savings for
offshore wind (LCOE) as result of repetition and standardisation. TenneT and its Contractors are to
contribute to this target by optimising both the Capex and Opex part of the grid connection system.
In order reach these political, financial and publicity sensitive LCOE targets TenneT has developed a
procurement strategy aiming to involve all future suppliers in achieving these.
The strategy is based upon in-house basic engineering (FEED) and separate tendering and award
processes for various large components e.g. HVAC equipment, Platform, Sea Cable, Land Cable and a
variety of other minor deliveries.
TenneT TSO B.V.
DATE
October 2015
PAGE
3 of 8
This memo accompanies the TED announcement for the Sea Cable qualification system and provides
further introduction of TenneT's tender strategy and planning for the Sea Cable scope.
Intention is to allow for maximal awareness in Sea Cable production and installation markets and hence
contribute to providing equal chances for all who are capable and interested.
The content of this memo is for generic information only.
No rights may be derived from any content or data stated herein.
Final and detailed information regarding scope for all of the offer phases to follow this qualification will be
published in the relevant ITT's.
TenneT TSO B.V.
DATE
October 2015
PAGE
4 of 8
2. Sea Cable Tender(s)
2.1 Tender strategy for Sea Cable
For Sea Cable the strategy is further detailed in this paragraph. The strategy consists of a qualification
system for the entire Offshore Grid NL program followed by separate offer phases for each projected wind
farm location.
If applicable the offer phase contains one wind area and the option for the second wind area at that same
location.
Borssele
Borssele
HKZ
Alpha
Beta
Alpha
HKZ Beta
HKN
Qualification System
Area 1
Area 2
Area 3
Qualified Candidates
Offer phase 1
Qualified Candidates
Offer phase 2
Qualified Candidates
Qualified for all area's
firm
optional
= as in 1 + new
firm
optional
= as in 2 + new
Offer phase 3
During the entire Offshore Grid NL program, candidates will be encouraged to qualify. At start of any new
offer phase new candidates will be evaluated and already qualified candidates will have reconfirm existing
qualifications.
Candidates may be main contractors and supporting sub-contractors or SPV consortia but are to be
committed for the entire Offshore Grid NL project.
TenneT TSO B.V.
DATE
October 2015
PAGE
5 of 8
2.2 Scope for Sea Cable
Five offshore AC substations and cable connections to the onshore high voltage grid are foreseen on three
locations within the Dutch coastal area as indicated in figure 1-1. Platforms within one area will be connected
as part of redundancy requirements.
Each connection to the onshore grid will consist of two circuits, two three core 220 kV AC Sea Cable and
two times three single core 220 kV AC Land Cable.
The scope for Sea Cable consists of design, engineering, manufacturing, offshore, near shore and landfall
installation of the sea cables and includes the pull-in at the platforms up to and including termination,
transition joints with the land cable (if any) or termination at land station.
For qualification technical cable capacities and a broad scope of marine installation capacities will be taken
into consideration.
In table 2-1 an overview is given of the Sea Cable and Land Cable scope where the route length of the
cables is preliminary and for indication only.
Table 2-1 Overview of Sea Cable and Land Cable scope
Wind Farm Location
Estimated submarine cable
Estimated land cable length
length
Borssele Alpha (route 4b)
60 km route = 120 km sea cable
0,7 km route = 4,2 km land cable
(or alt. 1.4 km sea cable)
Borssele Beta (route 4b)
60 km route = 120 km sea cable
0,7 km route = 4,2 km land cable
(or alt. 1.4 km sea cable)
Connecting Borssele Alpha and
10 km route = 10 km three core
Beta (Optional)
66 kV AC submarine cable
Hollandse Kust Zuid Alpha
40 -60 km route = 80-120 km sea
20 -5 km route = 120 – 30 km
cable
land cable.
40 -60 km route = 80-120 km sea
20 -5 km route = 120 – 30 km
cable
land cable.
Connecting HKZ Alpha and Beta
10 km route = 10 km three core
N/A
(Optional)
66 kV AC submarine cable
Hollandse Kust Noord
40 -60 km route = 80-120 km sea
20 -5 km route = 120 – 30 km
cable
land cable.
480-600 km sea cable + optionally
368 – 98 km land cable or
20 km three core 66 kV AC sea
alternative 360-90 km land cable
cable
+
Hollandse Kust Zuid Beta
Total
N/A
2.8 km sea cable
TenneT TSO B.V.
DATE
October 2015
PAGE
6 of 8
The scope of the first offering and award phase for the Sea Cable will consist of the cable connections
between the two AC platforms within the Borssele designated wind area and the substation Borssele and is
indicated in table 2-1 by the green coloured rows. Due to the short length of land cable route for the Borssele
connections, the Land Cable (optionally including installation) part is included as option in the Sea Cable
scope and may optionally be engineered as Sea Cable.
The location of the two AC platforms in the Borssele designated wind area and the location of the Borssele
onshore substation including various cable routes is shown in figure 2-1.
Figure 2-1 Route alternatives from the Borssele designated
wind area to the Borssele substation
For Borssele the route 4b is confirmed by formal VKA (approved preferred route).
For the other areas the routing is preliminary and subject to various studies and licensing procedures.
The Sea Cable scope could be amended with various optional minor single core Land Cable parts for the
purpose of installation on the AC platforms and / or land stations. These cable parts may be directly ordered
by TenneT or by the respective contracted third party.
TenneT TSO B.V.
DATE
October 2015
PAGE
7 of 8
2.3 Project Planning
For the entire WoZ project the execution planning is a crucial element.
Starting with Borssele Alpha the other 4 area's (Borssele Beta, Hollandse Kust Zuid Alpha & Beta and
Hollandse Kust Noord) will follow with 1 – 1.5 calendar year interval, each pending on successful award of
the respective concession. This is referred to as base case with "stop-and-go" principle and overlapping
planning.
For the first wind area the licensing is on the critical path and anticipated to be finalised by the end of 2016.
FID and final Contract award for submarine cable supply & installation is ultimately scheduled in Q4 2016
with grid connection system in operation in mid-2019.
Optionally alternatives in support of the LCOE targets of the project may be developed in which the interval
between Alpha and Beta will be reduced.
The indicative base case planning schedule is attached as appendix to this document.
2.4 Tender Planning
Indicative and preliminary planning for entire Grid-At-Sea Cable tender would be :
Activity
Qualification System
Subject
Preparation and TED prepublication
Target for Completion
Ytd until 15-10-2015
TED Publication
15-10-2015
Clarifications
19-10-2015 – 01-12-2015
Latest submittal date
qualification request for
04-12-2015
first offer phase
Offer phase Borssele
Qualification
18-12-2015
Preparation
Ytd until January 2016
Release of ITT
Februari 2016
Alpha
(+ option for Beta)
Confirmation of minimal
requirements
February 2016
Award
01-11-2016 Pending FID
Start of Work
01-01-2017
Prior to release of ITT
Q3 2017
Offer phase HKZ Alpha
Award
Q2 2018
(+option for Beta)
Start of Work
Q3 2018
Prior to Release of ITT
Q3 2019
Award
Q2 2020
Start of Work
Q2 2020
Confirmation of
Qualification
Confirmation of
Qualification
Offer Phase HKN
TenneT TSO B.V.
DATE
October 2015
PAGE
8 of 8