Transmission Line Project

heehawultraMechanics

Feb 22, 2014 (3 years and 6 months ago)

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Community Working Group Meeting 1


Saturday 25 February

Stroud to Lansdowne
Transmission Line Project


Community Working Group (CWG)


Community Working Group Meeting 1


Saturday 25 February

Agenda


Introductions and housekeeping


Project scope, background, need and process


Seeking community input
-

CWG and member
responsibilities


Present
O
ptions
S
election
R
eport (OSR)


Review corridor options and associated
constraints/opportunities


Field visit

Community Working Group Meeting 1


Saturday 25 February

Project scope

The proposal includes:


Construction of a single circuit 330 kV transmission line between Stroud
Substation and Lansdowne;


Establishment of a new 330 kV substation near Lansdowne, which would
initially operate as a 132

kV switching station;


Construction of a double circuit 132 kV transmission line between the
proposed Lansdowne Substation and the existing Taree to Port
Macquarie 132 kV transmission line;


Establishment of associated access tracks; and


Provision of all ancillary
infrastructure and works.


Community Working Group Meeting 1


Saturday 25 February

Study area (Figure 1)

Community Working Group Meeting 1


Saturday 25 February

Background and need


Significant population growth in the Mid North Coast region over the
coming two decades coupled with growth in employment
-
generating
sectors and associated services.



TransGrid’s

objective is to develop and maintain the NSW electricity
network to provide a safe and reliable supply of electricity.


Population
-

increase

by
more than
30,000 people
in
next decade

Peak summer
demand




expected to rise
by approximately
25%

Longer term
solution needed


safeguard
region’s
electricity supply

Community Working Group Meeting 1


Saturday 25 February

Background and need


Essential Energy and
TransGrid

track and periodically report on
forecast growth in electricity demands in the region



Current forecasts predict a future need to augment the electricity
network to ensure a safe and reliable supply of electricity



TransGrid

has sought alternatives to building new transmission
infrastructure, but to date no alternative has been identified that would
entirely remove the need for a new transmission line



Current estimates indicate a need for a new Stroud to Lansdowne 132
kV transmission connection in the mid 2010s, with
energisation

to 330
kV expected in the mid 2020s.


Community Working Group Meeting 1


Saturday 25 February

Options Selection Report


Aimed at identifying potential substation site options and transmission
line corridor options, and analysing those options based on
environmental planning factors


Community consultation will be used to refine options and to inform a
decision on a preferred site and corridor


The preferred site and corridor will form the basis of a detailed
Environmental Impact Statement, which will be subject to statutory
assessment and consultation


Options have been identified with the initial aim of avoiding
environmental planning impacts where possible



Community Working Group Meeting 1


Saturday 25 February


CWG


Seeking community input

1)
Gathering input on OSR, corridor options and substation locations

2)
Identify key constraints: environmental; social; and cultural

3)
Collect and disseminate information to stakeholders and wider
community

4)
Two meetings:


Saturday 25 February 2012
-

Review and understand corridor options
and provide initial input


Saturday 24 March 2012
-

Group discussion of constraints,
recommendations and opportunities



Community Working Group Meeting 1


Saturday 25 February

Seeking community input

Wider community consultation:

Commences Monday 27 February and closes Monday 26 March 2012


Letters to residents/businesses and key stakeholders


Newspaper advertisements


Media release


Website update


Feedback forms


Submissions received




Community Working Group Meeting 1


Saturday 25 February

Member responsibilities

As per Terms of Reference Charter:



Attend each meeting (a total of two)


Review meeting minutes


Verbally report to CWG on communication activities and stakeholder
concerns


Review and comment on information provided


Provide information to
TransGrid

on relevant issues concerning your local
community/group regarding the OSR/corridor options


Feed information provided back into your local community/group


Only make comments to the media or in public forums on behalf of yourself,
not on behalf of the CWG,
TransGrid

or AECOM

Community Working Group Meeting 1


Saturday 25 February

Process

Feb
2012


Draft OSR and preferred site/ corridor options
consultation

Apr 2012


Finalise OSR


Identify preferred corridor and substation site

Mid to
late 2012


EIS preparation

Early
2013


EIS public exhibition on preferred option

2013


Pending approval, construction begins

2014


Completion of construction

We
are
here

Community Consultation

Community Consultation

Community Consultation

Community Working Group Meeting 1


Saturday 25 February

Options Selection Report (OSR)

What is the OSR?

The OSR:


identifies potential corridor alignments for transmission line and
potential substation sites near Lansdowne;


aims to identify the least environmentally constrained corridor and
substation site; and


is being used as the basis for community and stakeholder
engagement.

Note: Tabs identify key chapters for consideration



Community Working Group Meeting 1


Saturday 25 February

Substation site options

Constraints analysis


First principles approach


Consideration of relative benefits and drawbacks of each site option


Three options proposed including an existing site owned by
TransGrid


Site identification:

area bounded by Taree to south,
Lansdowne to north, the Yarratt State
Forest to west and existing Taree to
Port Macquarie transmission line

Site investigations:

Ecology, acoustic modelling and
assessment, heritage and land use

Comparative analysis:

Assess all potential sites using colour
coding system

Community Working Group Meeting 1


Saturday 25 February

Substation site options (Figure 2)


Study area generally limited by topography to the north, urban
development to the south, Yarratt State Forest to the west and the
desire to avoid sites too far to the east (main northern railway line)


Key constraints within the study area include:

o
Land use (
Brimbin

urban release area)

o
Noise generation (residential receivers to the north, east and south)

o
Ecology (potentially significant vegetation)

o
Some heritage constraints

o
Some limitations relating to topography and drainage


Three potential site options have been identified


Community Working Group Meeting 1


Saturday 25 February

Substation land use (Figure 9)


Locality is a mix of rural residential zonings, and some environmental
protection zonings


Population centres have been avoided.


Rural residential and agricultural pursuits along the Lansdowne River


Proposed
Brimbin

urban release area has yet to be rezoned, and may
offer opportunity for accommodating land use planning outcome


Community Working Group Meeting 1


Saturday 25 February

Substation noise (Figure 10)


Basic acoustic modelling used to identify areas where additional noise
mitigation may be required (900 metres from residential receivers)


Key noise constraints likely to be towards the north


Potential implications for compatible land uses within the
Brimbin

release
area in future


Additional noise mitigation at the substation or at the affected receiver(s)
may be an alternative, depending on which site option is selected


Community Working Group Meeting 1


Saturday 25 February

Substation ecology (Figure 11)


An ecological sensitivity analysis mapping process was undertaken to
consider potential ecological constraints


The analysis included mapped ecological data such as Endangered
Ecological Communities, wetlands and riparian areas, key habitat
corridors, threatened fauna habitat


The locality includes some significant ecological constraints, including
habitat connectivity issues


Potential cumulative issues with transmission infrastructure connections
will need to be taken into account


Area is also recognised as important habitat for several threatened
species, and an important population of Red Gum


Community Working Group Meeting 1


Saturday 25 February

Substation heritage and watercourses
(Figure 12 and 13)


Watercourses and known Aboriginal heritage items have been avoided


Potential for new heritage items to be uncovered, particularly towards
the south around drainage lines and Dawson River


Heritage and watercourse constraints could be avoided through careful
design

Community Working Group Meeting 1


Saturday 25 February

Substation sites evaluation (Table 26)

Substation Site Option 1

Substation Site Option 2

Substation Site Option 3

Impact Category: Land Use

Low impacts on existing land use

Medium impacts on existing land
use

Medium impacts on existing land
use

Medium amenity implications for
existing receivers

Low amenity implications for
existing receivers

Low amenity implications for
existing receivers

Low
-
medium implications for
strategic land use planning and
future land uses

Medium implications for strategic
land use planning and future land
uses

Medium
-
high implications for
strategic land use planning and
future land uses

Land Use Preference 1

Land Use Preference 2

Land Use Preference 3

Impact Category: Noise

High need for noise mitigation

Low
-
medium need for noise
mitigation

Low need for noise mitigation

Low potential to affect future land
use types in Brimbin urban release
area

Medium potential to affect future
land use types in Brimbin urban
release area

Medium
-
high potential to affect land
use types in Brimbin urban release
area

Noise Preference 3

Noise Preference 1

Noise Preference 1

Impact Category: Ecology

High level of site clearing

Low level of site clearing

Low
-
medium level of site clearing

High impact on habitat connectivity

Low
-
medium impact on habitat
connectivity

Low
-
medium impact on habitat
connectivity

Medium
-
high potential for impacts
associated with transmission line
connections into and out of the site

Low
-
medium potential for impacts
associated with transmission line
connections into and out of the site

Low medium potential for impacts
associated with transmission line
connections into and out of the site

Ecology Preference 3

Ecology Preference 1

Ecology Preference 2

Community Working Group Meeting 1


Saturday 25 February

Substation sites evaluation (Table 27)

Impact Category

Substation Site 1

Substation Site 2

Substation Site 3

Land Use

Preference 1

Preference 2

Preference 3

Noise

Preference 3

Preference 1

Preference 1

Ecology

Preference 3

Preference 1

Preference 2

PREFERENCE RATING

ALTERNATIVE 2

LEAST CONSTRAINED

ALTERNATIVE 1

Community Working Group Meeting 1


Saturday 25 February




Identification of corridor options


First principles approach


Identification of landscape
-
scale constraints








Develop screening criteria:



E
nvironmental

values to be
avoided or desirable to avoid

Undertake environmental
screen:

Application of screening
criteria by desktop analysis

Corridor options identified:

Result of constraints tested
against screening criteria

Field investigations:


“Ground
-
truthing
” along
identified corridor options

Community Working Group Meeting 1


Saturday 25 February



Study area defined to generally avoid the coastal zone to the east
(Pacific Highway) and based on northern (Lansdowne substation site)
and southern (Stroud substation) practical limits. Western limit defined
by topography and desire to minimise transmission line length


Key environmental planning constraints include land use, landscape/
visual, ecology, heritage, traffic, soils/ water


Key pinch point in the Taree
-
Wingham area where corridors have been
pushed into the Yarratt State Forest to avoid urban development areas





Corridor
options (Figure 3 and Figure 4)

Community Working Group Meeting 1


Saturday 25 February



Corridor Option 1


generally along the existing 132 kV transmission
line easement


Corridor Option 1 + 1a


deviation from Corridor Option 1 along The
Bucketts Way


Corridor Option 1 + 1b


alternative crossing to the west of
Winghman


Corridor Option 1 + 1a + 1b


hybrid option


Corridor Option 2


western edge of Stroud
-
Gloucester Valley and north
of Wingham




Corridor
options (Figures 5
-
7)

Community Working Group Meeting 1


Saturday 25 February


Urban areas and population centres have been avoided through the
corridor identification process


Generally rural residential in nature (Figures 14
-
16)


Some environmental conservation zonings to the south of Gloucester
(Figure 15)


Key pinch point around Taree
-
Wingham corridor, where urban
development density increases (Figure 16)


Mining is also a significant constraint through the Stroud
-
Gloucester
Valley (Figures 17 and 18)


Connection through the
Brimbin

release area will require careful design
(Figure 16)




Corridor
options land use

Community Working Group Meeting 1


Saturday 25 February


Corridor alignments along the existing 132 kV transmission
line corridor will minimise visual impacts through co
-
location,
rather than spreading transmission line infrastructure


Landscape character mapping (Figure 20) has been used to
identify sensitive landscapes, and those with greater potential
to ‘hide’ transmission infrastructure within the landscape


Floodplains (landscape character types 3, 9 and 10) are
susceptible to visual impacts as are urban/ rural fringe areas
(landscape character type 10)


Crossing ridgelines will require careful design to ensure
minimisation of potential visual impacts (landscape character
type 7)




Corridor
options landscape/ visual

Community Working Group Meeting 1


Saturday 25 February


Landscapes such as steep rolling hills (landscape character type 5)
and forested hills (landscape character type 11) offer opportunities for
‘hiding’ transmission infrastructure


Concrete/ steel H
-
frame poles or steel lattice towers will be used for
the new power line


Visualisations have been produced to show how H
-
frame poles and
steel lattice towers may look along the corridor options (Appendix A)




Corridor
options landscape/ visual

Community Working Group Meeting 1


Saturday 25 February


The ecological sensitivity analysis has been mapped across the study
area


Where possible, ecological constraints have been avoided through the
corridor identification process


The most significant potential ecological impacts are associated with the
crossing of the Yarratt State Forest (Figure 23). This is common to all
corridor options.


Other pinch points include the crossing of mountain ranges to the east of
Belbora (Figure 22) and along the edges of the Stroud
-
Gloucester Valley
(Figure 21)




Corridor
options ecology (Figures 21
-
23)

Community Working Group Meeting 1


Saturday 25 February


Most known Aboriginal and non
-
Aboriginal heritage items have been
avoided through the corridor identification process, or could be avoided
through careful design of the transmission line within the preferred
corridor


The Stroud
-
Gloucester Valley and Vale of Gloucester (Figures 24 and
25) are indicative listings on the Register of the National Estate


Both listings relate to the heritage landscape and span both heritage and
landscape values


All options would affect these listing areas, although potential impacts
have been minimised by identifying corridors along the edge of the valley,
rather than through it




Corridor
options heritage (Figures 24
-
26)

Community Working Group Meeting 1


Saturday 25 February


Killawarra

Reserve is also an indicative listing on the Register of the
National Estate, but could be avoided through careful transmission line
design (Figure 26)


The
Hillview

property and Bo
Bo

Creek Cemetery are important
European heritage items listed under the Greater Taree local
environmental plan (Figure 26), which could also be avoided through
careful transmission line design




Corridor
options heritage

Community Working Group Meeting 1


Saturday 25 February


The study area spans the catchments for the Manning River and
Karuah River (Figure 27)


A watercourse sensitivity analysis has been undertaken to consider the
potential impacts of crossing watercourses along each corridor option
(Figures 28
-
30)


Watercourse crossings represent both a practical constraint to
construction, but also the potential to impact on riparian areas with
possible flow on effects for bank stability, erosion and sedimentation


The Manning River crossing near The Bight (Figure 30) is important in
terms of potential impacts on watercourse navigation




Corridor
options soils and water

Community Working Group Meeting 1


Saturday 25 February


Consideration has been given to the number of times each corridor option
crossings road, rail and existing power infrastructure


Such crossings may represent practical constraints to construction and
potential safety issues that will need to be considered further as part of
the detailed design process


Potential impacts on airports and landing strips have been avoided
through the corridor identification process




Corridor
options traffic, transport and
infrastructure

Community Working Group Meeting 1


Saturday 25 February

Corridor options evaluation



Please refer to Table 28

Community Working Group Meeting 1


Saturday 25 February

Corridor options evaluation (Table 29)

Impact Category

Corridor Option 1

Corridor Option 1 + 1a

Corridor Option 1 + 1b

Corridor Option 1 + 1a +
1b

Corridor Option 2

Land Use

Preference 1

Preference 1

Preference 4

Preference 5

Preference 1

Landscape Character and
Visual

Preference 2

Preference 1

Preference 3

Preference 4

Preference 5

Ecology

Preference 1

Preference 4

Preference 1

Preference 1

Preference 5

Heritage

Preference 4

Preference 3

Preference 1

Preference 1

Preference 5

Soil and Water

Preference 3

Preference 3

Preference 5

Preference 3

Preference 1

Traffic and Transport

Preference 1

Preference 4

Preference 1

Preference 3

Preference 4

PREFERENCE
RANKING

LEAST
CONSTRAINED

ALTERNATIVE 2

ALTERNATIVE 1

ALTERNATIVE 3

ALTERNATIVE 4

Community Working Group Meeting 1


Saturday 25 February

Initial feedback


Open discussion


Community Working Group Meeting 1


Saturday 25 February

Meeting 2 preparation

We request that you please:


Read

the OSR, particularly the marked pages/sections


Watch out
for your invitation by mail


Disseminate information
provided today to wider groups/communities


Identify

other constraints, issues or opportunities to be raised at the next
meeting


Contact the project team
if you have any questions



Phone 1800 222 537 Email stroud.lansdowne@transgrid.com.au



Community Working Group Meeting 1


Saturday 25 February

What now?





Field visit


reconvene at 1.25pm for
1.30pm departure