East Anglia Two Offshore Windfarm Outline Onshore -PDF Free Download

East Anglia TWO Offshore Windfarm Outline Onshore

2020 | 11 views | 12 Pages | 389.88 KB

1. This Outline Onshore Substation Design Principles details the design principles which underpin the design of the operational onshore substation of the proposed East Anglia TWO project. The Applicant will use this outline document as the foundation for developing the final Onshore Substation Design Principles post-



East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
Revision Summary
Rev Date Prepared by Checked by Approved by
01 08 10 2019 Paolo Pizzolla Julia Bolton Helen Walker
Description of Revisions
Rev Page Section Description
01 n a n a Final for Submission
8 8 Outline Onshore Substation Design Principles Statement Page i
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
Table of Contents
Outline Onshore Substation Design Principles Statement 1
1 Introduction 1
1 1 Background 1
2 Design Principles 2
2 1 National Design Policies 2
3 Outline Design Principles 2
4 Finished Ground Level 4
5 References 5
8 8 Outline Onshore Substation Design Principles Statement Page ii
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
Glossary of Acronyms
AIS Air Insulated Switchgear
AONB Area of Outstanding Natural Beauty
CABE Commission for the Architecture and Built Environment
CCS Construction Consolidation Sites
COCP Code of Construction Practice
DAS Design and Access Statement
DCO Development Consent Order
DTS Distributed Temperature Sensing
EIA Environmental Impact Assessment
ES Environmental Statement
ETG Expert Topic Group
FO Fibre Optic
HDD Horizontal Directional Drilling
HGV Heavy Goods Vehicle
HVAC High Voltage Alternating Current
GIS Gas Insulated Switchgear
LAT Lowest Astronomical Tide
NPS National Policy Statement
OLEMS Outline Landscape and Ecological Management Strategy
O M Operation and Maintenance
PEIR Preliminary Environmental Information Report
PID Public Information Day
PRoW Public Right of Way
SF6 Sulphur hexafloride
SPA Special Protection Area
SR Scoping Report
SSSI Site of Special Scientific Interest
8 8 Outline Onshore Substation Design Principles Statement Page iii
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
Glossary of Terminology
Applicant East Anglia TWO Limited
Cable sealing end A compound which allows the safe transition of cables between the
compound overhead lines and underground cables which connect to the National Grid
substation
Cable sealing end A compound which includes a circuit breaker which allows the safe
with circuit breaker transition of cables between the overhead lines and underground cables
compound which connect to the National Grid substation
Construction Compounds associated with the onshore works which may include elements
consolidation sites such as hard standings lay down and storage areas for construction
materials and equipment areas for vehicular parking welfare facilities
wheel washing facilities workshop facilities and temporary fencing or other
means of enclosure
Development area The area comprising the onshore development area and the offshore
development area described as the order limits within the Development
Consent Order
East Anglia TWO The proposed project consisting of up to 75 wind turbines up to four
project offshore electrical platforms up to one construction operation and
maintenance platform inter array cables platform link cables up to one
operational meteorological mast up to two offshore export cables fibre
optic cables landfall infrastructure onshore cables and ducts onshore
substation and National Grid infrastructure
East Anglia TWO The offshore area within which wind turbines and offshore platforms will be
windfarm site located
European site Sites designated for nature conservation under the Habitats Directive and
Birds Directive as defined in regulation 8 of the Conservation of Habitats
and Species Regulations 2017 and regulation 18 of the Conservation of
Offshore Marine Habitats and Species Regulations 2017 These include
candidate Special Areas of Conservation Sites of Community Importance
Special Areas of Conservation and Special Protection Areas
Horizontal directional A method of cable installation where the cable is drilled beneath a feature
drilling HDD without the need for trenching
HDD temporary Temporary compounds which will contain laydown storage and work areas
working area for HDD drilling works
Jointing bay Underground structures constructed at intervals along the onshore cable
route to join sections of cable and facilitate installation of the cables into the
buried ducts
Landfall The area from Mean Low Water Springs where the offshore export cables
would make contact with land and connect to the onshore cables
Link boxes Underground chambers within the onshore cable route housing electrical
earthing links
Mitigation areas Areas captured within the onshore Development Area specifically for
mitigating expected or anticipated impacts
National electricity grid The high voltage electricity transmission network in England and Wales
owned and maintained by National Grid Electricity Transmission
National Grid A National Grid substation cable sealing end compounds cable sealing end
infrastructure with circuit breaker compound underground cabling and National Grid
overhead line realignment works to facilitate connection to the national
electricity grid all of which will be consented as part of the proposed East
Anglia TWO project Development Consent Order but will be National Grid
owned assets
National Grid Works required to upgrade the existing electricity pylons and overhead lines
overhead line including cable sealing end compounds and cable sealing end with circuit
realignment works
8 8 Outline Onshore Substation Design Principles Statement Page iv
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Outline Onshore Substation Design Principles Statement
breaker compound to transport electricity from the National Grid substation
to the national electricity grid
National Grid The proposed area for National Grid overhead line realignment works
overhead line
realignment works
National Grid The substation including all of the electrical equipment within it necessary
substation to connect the electricity generated by the proposed East Anglia TWO
project to the national electricity grid which will be owned by National Grid
but is being consented as part of the proposed East Anglia TWO project
Development Consent Order
National Grid The proposed location of the National Grid substation
substation location
Natura 2000 site A site forming part of the network of sites made up of Special Areas of
Conservation and Special Protection Areas designated respectively under
the Habitats Directive and Birds Directive
Onshore cable The corridor within which the onshore cable route will be located
Onshore cable route This is the construction swathe within the onshore cable corridor which
would contain onshore cables as well as temporary ground required for
construction which includes cable trenches haul road and spoil storage
Onshore cables The cables which would bring electricity from landfall to the onshore
substation The onshore cable is comprised of up to six power cables which
may be laid directly within a trench or laid in cable ducts or protective
covers up to two fibre optic cables and up to two distributed temperature
sensing cables
Onshore development The area in which the landfall onshore cable corridor onshore substation
area landscaping and ecological mitigation areas temporary construction
facilities such as access roads and construction consolidation sites and
the National Grid Infrastructure will be located
Onshore infrastructure The combined name for all of the onshore infrastructure associated with the
proposed East Anglia TWO project from landfall to the connection to the
national electricity grid
Onshore preparation Activities to be undertaken prior to formal commencement of onshore
works construction such as pre planting of landscaping works archaeological
investigations environmental and engineering surveys diversion and laying
of services and highway alterations
Onshore substation The East Anglia TWO substation and all of the electrical equipment within
the onshore substation and connecting to the National Grid infrastructure
Onshore substation The proposed location of the onshore substation for the proposed East
location Anglia TWO project
Transition bay Underground structures at the landfall that house the joints between the
offshore export cables and the onshore cables
8 8 Outline Onshore Substation Design Principles Statement Page v
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
Outline Onshore Substation Design
Principles Statement
1 Introduction
1 1 Background
1 This Outline Onshore Substation Design Principles details the design principles
which underpin the design of the operational onshore substation of the proposed
East Anglia TWO project The Applicant will use this outline document as the
foundation for developing the final Onshore Substation Design Principles post
consent as part of the discharging of requirements of the draft DCO
2 This document should be read in conjunction with the Outline Landscape and
Ecological Mitigation Strategy OLEMS document reference 8 7 Principles
relating to overall site design are dealt with in this document and would be
delivered via either the Ecological Management Plan EMP or Landscape
Management Plan LMP
3 The draft DCO states that certain details of the onshore substation design must
be submitted to and approved by the relevant Local Planning Authority prior to
the commencement of construction This document sets out the principles which
could be included in that submission
4 The detailed design parameters onshore requirement of the DCO states
1 No stage of Work No 30 may commence until details of the layout scale and
external appearance of the onshore substation have been submitted to and
approved by the relevant planning authority Work No 30 must be carried out in
accordance with the approved details
2 Any details provided by the undertaker pursuant to paragraph 1 must accord
with the outline onshore substation design principles statement and be within the
Order limits
3 To the extent comprised within the onshore substation
a Buildings must not exceed a height of 15 metres above finished ground level
b External electrical equipment with the exception of lightning protection masts
must not exceed a height of 18 metres above finished ground level
8 8 Outline Onshore Substation Design Principles Statement Page 1
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
c Lightning protection masts must not exceed a height of 25 metres above
finished ground level and
d The maximum number of lightning protection masts must not exceed six
4 For the purposes of paragraph 3 finished ground level will be defined in
accordance with the outline onshore substation design principles statement
5 The fenced compound area excluding its accesses for the onshore
substation must not exceed 36 100 m2
2 Design Principles
2 1 National Design Policies
5 Existing policy set out within the Overarching National Policy Statement for
Energy NPS EN 1 makes clear the requirements of good design in energy
projects The Planning Inspectorate is to be satisfied that developments are
sustainable and having regard to regulatory and other constraints are as
attractive durable and adaptable including taking account of natural hazards
such as flooding as they can be
6 EN 1 NPS also states that Virtually all nationally significant energy infrastructure
projects will have effects on the landscape Projects need to be designed
carefully taking account of the potential impact on the landscape Having regard
to siting operational and other relevant constraints the aim should be to minimise
harm to the landscape providing reasonable mitigation where possible and
appropriate
7 EN 3 NPS for Renewable Energy Infrastructure states that Proposals for
renewable energy infrastructure should demonstrate good design in respect of
landscape and visual amenity and in the design of the project to mitigate impacts
such as noise and effects on ecology
3 Outline Design Principles
8 The Applicant will use the following principles as the foundation for developing
the final Onshore Substation Design Principles post consent as part of the
discharging of requirements of the draft DCO
9 The outline design principles are as follows
Continued engagement with Parish Councils local residents and relevant
authorities Suffolk County Council and East Suffolk Council on design and
8 8 Outline Onshore Substation Design Principles Statement Page 2
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Outline Onshore Substation Design Principles Statement
landscape proposals Opportunity will be provided through the development
of the final design and landscape proposals to seek feedback from local
communities who will be directly affected by the development
The landscape and building design proposals be subject to design review in
consultation with the relevant local authorities This could involve the Design
Council or Shape East The output of this design review if it is appropriate to
do so will form part of the onshore substation procurement or detailed design
Consideration of Good Design in line with the requirements of Overarching
National Policy Statement for Energy NPS EN 1
Appropriate building design and materials will be actively sought as part of the
procurement process The onshore substation building for the proposed East
Anglia TWO project should be sensitively placed with visual impacts
minimised as far as possible by the use of appropriate design building
materials shape layout coloration and finishes
On site mitigation planting proposals will be undertaken within the onshore
development area immediately around the onshore substation in order to
minimise its visual effect and maximise screening opportunities from key
viewpoints receptors while also responding to local landscape character
pattern and growing conditions Planting proposals will be considered along
with the substation building design and layout of ancillary structures
The overall site design should have regard to the potential for embedded
ecological mitigation and enhancement The Sustainable Drainage System
SuDS solution for the onshore substation as a minimum will include a
ponded area which could represent habitat creation on the site
The overall site design will maximise the opportunity for site won topsoil and
subsoil materials to be reused on site within landscape earthworks bunds
These bunds should support the visual screening of the onshore substation
while having a gradual external slope gradient that appears natural and
complements the existing terrain when looking towards the onshore
substation
8 8 Outline Onshore Substation Design Principles Statement Page 3
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
The overall site design will seek to deliver gains for public amenity including
enhanced access through Public Rights of Way PRoW proposals and areas
for landscape planting
Species rich grassland areas will be established to provide a low maintenance
ground cover which also enhances the local biodiversity in areas that are not
to be returned to agricultural use or planted as woodland The overall site
design will identify land around the onshore substation that will be returned to
agricultural use during the operational period
4 Finished Ground Level
10 The maximum heights specified for buildings external electrical equipment and
lightning protection masts relate to heights above finished ground level in the
immediate area surrounding buildings external electrical equipment and lightning
protection masts
11 Based on preliminary engineering design undertaken the finished ground level
in respect of the onshore substation is anticipated to be approximately 21 4m
AOD where the onshore substation is located in the eastern area of Work No 30
and approximately 19 8m AOD where the onshore substation is located in the
western area of Work No 30 The final finished ground level will be established
during detailed design post consent
12 There are a number of factors that could influence the maximum finished ground
level including
Surface water drainage design requirements to ensure adequate surface
water run off from the onshore substation and a suitable connection to the
existing surface water drainage system at Church Road
Existing ground levels and practicable cut and fill requirements to optimise
the cut and fill balance of the onshore substation and minimise the need to
import or export spoil material during the onshore substation construction
Groundwater constraints to ensure appropriate management and control of
groundwater interactions in the design of the onshore substation
13 Details of the layout scale and external appearance of the onshore substation
including finished ground levels will be submitted to relevant the Local Planning
Authority for approval prior to commencement of construction of the onshore
substation
8 8 Outline Onshore Substation Design Principles Statement Page 4
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
5 References
Department of Energy and Climate Change DECC 2011 Overarching National Policy
Statement for Energy EN 1 July 2011
8 8 Outline Onshore Substation Design Principles Statement Page 5
East Anglia TWO Offshore Windfarm
Outline Onshore Substation Design Principles Statement
This page is intentionally blank
8 8 Outline Onshore Substation Design Principles Statement Page 6


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