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North West Coast Connections Project PINS Briefing 12 August 2015 Robert Powell, Judith Vokes, Richard Gwilliam

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Page 1: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

North West Coast Connections Project

PINS Briefing

12 August 2015

Robert Powell, Judith Vokes, Richard Gwilliam

Page 2: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

The North West Coast Connections Project

Moorside

2

Page 3: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What do we need to build?

An electrical connection for Moorside needs four transmission circuits – two double circuits

Double circuit 1 Double circuit 2

3

Page 4: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Technologies

How Do We Do It?

Page 5: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Technologies for Connection

400kV AC Overhead Line

132kV Conventional lattice

300-400 MW

Height typically 27.5m

400kV Conventional

lattice

6,900 MW

Height typically 46-50m

400kV T Pylon

6,900 MW

Height typically 35-38m

132kV Trident wood pole

120-150 MW

Height typically 13m

400kV Low height lattice

6,900 MW

Height typically 38-41m

Page 6: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Technologies for Connection

400kV AC Overhead Line

400kV Conventional

lattice

Page 7: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

7

400kV Low height lattice

Technologies for Connection

400kV AC Overhead Line

Page 8: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

8

400kV T Pylon

Technologies for Connection

400kV AC Overhead Line

Page 9: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

9

132kV Conventional

lattice

Technologies for Connection

400kV AC Overhead Line

Page 10: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

10

Minimising the impact

Sensitive routeing of overhead lines

Screening and landscaping

Rationalisation of existing lines

Alternative pylon designs

Placing new line underground

Page 11: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

11

Technologies for Connection

Underground 400kV AC Cable

This site width 40m

5000A circuit site width 70m

Page 12: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

12

Technologies for Connection

Tunnelling

Head house

diameter

approx 16

metres &

7 metres high

Tunnel is about 25-

30 metres below

ground

Longer tunnels require

ventilation points and emergency

access along route

Page 13: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

13

Technologies for Connection

Tunnelling

Page 14: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

14

Technologies for Connection

High Voltage Direct Current (HVDC)

• An alternative solution to AC for bulk transmission of electricity • NG would expect this to be undersea / underground • Much narrower cable route than AC • The type of HVDC needed does not exist today at required power levels • Technology has not yet been used to connect a nuclear power station

Page 15: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Technology: the options

Overhead line Cable (direct burial

XLPE)

Cable (gas insulated

(GIL))

Cable (tunnel) HVDC

typical

£ £2.5m to £3.0m

per km

£13m to £32m per

km

Similar to Cable Cost of tunnel +

cable

£2m per km plus up

to £332m per pair of

convertor stations

PROS Limited

disturbance; quick

build; operational

flexibility together

with rapid repair

and restoration

times

Improved visual

amenity

No reactors or above

ground installations;

narrower working

width.

Use in highly

constrained areas

Advantages over AC

transmission over long

distance (e.g.

interconnectors)

CONS Visual impact Lengthy construction

and disturbance;

fault detection and

repair; above ground

infrastructure; above

ground reactive

compensation

New technology, use

of SF6

Difficult to

alter/expand

Lack of flexibility –

difficult to transform

voltage; large

converter stations

required

Page 16: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Development Programme

Page 17: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Regional Stakeholder Engagement

Started in 2005 with drive to see new nuclear development in Cumbria

National Grid involved since 2009

30 local planning authorities

Range of environmental, business and community organisations including; Natural England, English Heritage, the Marine Management Organisation, Morecambe Bay Partnership, CALC, LALC

17

Page 18: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

• Initial work and

studies looking at the

ways to connect

Moorside

2013 - 2014 2009 -2011 2012

18

Project Timeline

• Technical consultation

on six broad connection

options

• 23 Oct 2012

announced decision to

take two strategic

options forward for

further study

• Identified route

corridors in which a new

connection could be

built.

• 12 week outline

routeing consultation.

•Landowners contacted.

•EIA wildlife studies

started.

Page 19: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

2013 - 2014 2009 -2011

19

Project Timeline

2015 2016

• Review 2014

consultation feedback

• Announce proposed

route corridor being

progressed

• Ongoing studies to

determine detailed

route of new

connection and how it

will be built

• Continue working

with stakeholders to

shape proposals

odetailed route

o construction

o Mitigation

o further EIA surveys

• DCO submission to the

Planning Inspectorate

2017

• Formal public

consultation on

route alignment

and construction

technologies

•Complete EIA

Page 20: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

2013 - 2014 2009 -2011 2012

20

Project Timeline

2015 2016 2017

• Decision on

application made by the

Secretary of State for

Energy and Climate

Change

2018 2019 2024

• Subject to consent

being granted

start construction new

connection

• Complete connection

to meet Moorside first

generation in 2024.

Page 21: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Strategic Options Consultation

11 May 2012 -19 July 2012

Page 22: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Strategic Options Consultation

Page 23: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Strategic Options Consultation

Page 24: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Outline Routeing Public Consultation

4 Sept – 28 Nov 2014

Page 25: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

25

Publicising the Consultation

Page 26: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

26

Publicising the Consultation

Page 27: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

27

Consultation Responses

Page 28: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What you told us – most common

themes

28

The Lake District National Park

Rationalisation (removal of

existing ENW 132kV towers)

Designing a route to minimise

landscape impacts

Minimising disruption to and

impacts on communities

The possibility of an offshore

option

Page 29: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What you told us - Onshore North

29

Preferences mostly for the

green route

Tends to be seen as

sensible, as long as it results

in an existing line coming

down

Some specific areas of

concern

Page 30: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What you told us - Onshore South

30

Wide opposition to Onshore

South

People said running a line

through the South Lakes

would be unacceptable

The main reason for

supporting this route was

cost

Page 31: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What you told us - Offshore South

People generally supported

this option on landscape

grounds

But many noted that it was

technically challenging

Greatest problem is

connecting HVDC

NuGen said this would not

work for the nuclear power

station

31

Page 32: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

What you told us - Onshore South

with Tunnel

Qualified support from many

members of the public

Broad support from

stakeholders

People said that if an offshore

connection wasn’t possible,

then they liked the idea of a

tunnel

32

Page 33: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Consultation Feedback

Rationalisation of existing

overhead lines is important

both north and south of

Moorside

Future development south of

Whitehaven

Feedback reaffirmed visually

sensitive areas, particularly:

o Lake District National Park

o Ravenglass

o Duddon estuary

33

Page 34: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Consultation Feedback

All feedback redacted and

published on our website for

2012 and 2014 consultations

Propose to repeat this for

formal consultation in 2016

34

Page 35: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Next Steps

We will work with:

Local Authorities

Landowners

Parish Councils

Community

Agricultural shows

Information events

Special interest groups 35

Page 36: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Next Steps

Which pylons we are going to use and

where to put them?

132kV lines to take down?

New substations?

Temporary 132kV lines

415V, 11kV and 33kV crossings

Is there a need for more mitigation?

What landscaping should we do?

EIA Scoping

SOCC

36

Page 37: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Development Programme

37

2017

2019

2024

2016 Public Consultation on Detailed Proposal

Submit DCO Application

Start build?

Ready for power station

Page 38: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

GIS

4Projects

Issues and Opportunities

38

Page 39: North West Coast Connections Project...400kV T Pylon 6,900 MW Height typically 35-38m 132kV Trident wood pole 120-150 MW Height typically 13m 400kV Low height lattice 6,900 MW Height

Any Questions?


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