NEED/OPPORTUNITY STATEMENT & OPTION SCREENING … - NOSA 1904 Renewables in... · 3 / Renewables in...

1 / Renewables in North Western NSW NOS- 000000001904 revision 2.0

Ellipse project no(s):

TRIM file: [TRIM No]

Project reason: Reliability - To meet connection point reliability requirements and achieve market benefits

Project category: Prescribed - Connection

Approvals

Author Jay Esson Network Planning Engineer

Endorsed Jahan Peiris Main Grid Planning Manager

Andrew Kingsmill Manager/Network Planning

Approved Andrew Kingsmill Manager/Network Planning

Date submitted for approval 1 December 2017

Change history

Revision Date Amendment

0 November 2017 Initial issue

1 December 2017 Project triggers updated

NEED/OPPORTUNITY STATEMENT & OPTION

SCREENING ASSESSMENT (NOSA)

Renewables in North Western NSW

NOSA- 000000001904 revision 2.0


1. Background

Support North Western NSW for Renewables

On 14 July 2017, COAG adopted the majority of recommendations of the Independent Review into the Future

Security of the National Electricity Market. The adopted recommendations include the development of an integrated

grid plan and identification of priority projects to facilitate the efficient development and connection of renewable

energy zones.

It is probable that the integrated grid plan will identify renewable energy zones and priority projects in New South

Wales. However, the location and scope of the renewable energy zones is not sufficiently certain to be included in

the ex-ante capital expenditure forecast in the revenue proposal.

TransGrid has interest from renewable energy proponents seeking to connect to its network in North Western New

South Wales. Therefore, it is probable that North Western New South Wales may be identified as a renewable

energy zone in the integrated grid plan.

2. Need/opportunity

The network in North Western NSW is a parallel network of 132 kV lines connecting to the 330 kV substations at

Tamworth and Armidale (see Figure 1).

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132

Gunnedah

Narrabri

Inverell

Glen Innes

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8C8E

8L8M

96R

968

969

97A

97B

86

85

84

88

966

96C

965

87

13.6 kV

SVC

Design voltage 330 kV

Operating voltage 132

kV

330 kV

132 kV

66 kV and below

Interstate Exchange Point

Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East9UJ

White Rock

Wind Farm

9UG

S

Figure 1 – North Western NSW area network


TransGrid has received applications for a number of generator connections to the North Western NSW

transmission system. Some of these projects are proposed to connect to the 132 kV and 66 kV network and will

result in the flow of power from the local 132 kV network to 330 kV network. Other projects are proposed to connect

to the 330 kV network, and the capacity for additional generation on the 330 kV in this part of the network is

approaching full capacity. If no network augmentations are undertaken with these additional renewable generation

developments, it’s possible that these new generators would need to be curtailed to manage system security.

Curtailment of cheap renewable generation would result in higher prices in National Electricity Market.

Tables 1 and 2 summarise these proposed projects (refer Figure 2 for a geographical representation of these new

renewable connections).

Table 1 – Generation connection interests – 132 kV or below

Project Capacity Connection Point Project Stage

This equates to 132 kV or 66 kV connections of:

170 MW of partially commission generation;

280 MW of advanced generation;

540 MW that require significant augmentation to increase capacity to sufficient levels to cater for these

connections,

Plus 875 MW of multiple parties competing for capacity at the same location,

.


Table 2 – Generation connection interests – 330 kV

Project Capacity Connection Point Project Stage

This equates to 330 kV connections of:

270 MW of committed generation;

220 MW of advanced generation;

Currently an additional 500 MW of enquiries;

Plus 2 sites with multiple parties competing for capacity:


Figure 2 – North Western NSW area network with potential generator connections

It is anticipated that new generator connections in North Western NSW may deliver market benefits with additional

augmentations to allow these new connections to generate without constraints placed upon them. The market

benefits would be from the following key sources:

Lower costs associated with meeting the supply reliability standard in New South Wales, through

facilitating access to the output from these additional generation connections; and

Lower market dispatch costs (and hence lower prices for consumers) resulting from the additional output

from these additional generator connections.

Subject to commitment of over 800 MW of generation in North Western NSW, there may be an opportunity to

expand the transmission network to realise the market and economic benefits of increased transmission capacity

from the new generator connections in North Western NSW to the rest of the NEM.


3. Related needs/opportunities

Connections of new generation in North Western New South Wales will continue to be monitored.

4. Options Summary

Table 1 — Options

Option Short description OFS required

Technically feasible

A Wollar – Gunnedah – Tamworth 330 kV single circuit transmission line (+ 330 kV substations)

Yes Yes

B Wollar – Narrabri - Armidale 330 kV double circuit transmission line (+ 330 kV substations)

Yes Yes

C Liddell – Tamworth – Gunnedah – Wollar and Tamworth - Tenterfield – Armidale 330 kV single circuit transmission line (+ 330 kV substations)

Yes Yes

D Wollar – Gunnedah – Narrabri – Moree – Sapphire 330 kV double circuit transmission lines (+ 330 kV substations + 969 upgrade to 330 kV)

Yes Yes

E Wollar – Gunnedah, Gunnedah – Tamworth, Gunnedah – Armidale East, Tamworth – Armidale East, Armidale East – Sapphire 330 kV single circuit transmission lines (+ 330 kV substations)

Yes Yes

NP&O/Project Development shall undertake Options Feasibility Studies for the options as indicated in Table 1

above. The assessments shall include consideration of the cost, timing of activities, risk analysis and practicality of

being able to carry out the works.

The Option Feasibility Study for Option E is required by 31 October 2017. The studies for the other options are

required 30 April 2018, and high level costings to be provided by February 2018.


5. Options

5.1 Option A: Wollar – Gunnedah – Tamworth 330 kV single circuit transmission line (+ Gunnedah 330 kV substation)

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132

Gunnedah

Narrabri

Inverell

Glen Innes

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8C8E

8L8M

96R

968

969 97A

97B

86

85

84

88

966

96C

965

87

13.6 kV

SVC


Operating voltage 132 kV

330 kV

132 kV

66 kV and below


Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East

9UJ

White Rock

Wind Farm

9UG

S

To Wollar

(~200km)

~65km

Tentative ultimate possible with this option:

a) Gunnedah – Narrabri – Moree – Mid-South Queensland 330 kV transmission lines (+ Moree – Sapphire

330 kV transmission line) OR

b) Armidale – Glen Innes – Tenterfield – South-East Queensland 330 kV transmission lines

c) Future: duplicate Wollar - Gunnedah, turn 5A3 into Wollar

Transmission line works:

All transmission lines are to be single circuit, 330 kV, strung with twin olive conductor:

~200km Wollar – Gunnedah


~65km Gunnedah – Tamworth

Substation works:

Gunnedah 330/132/66 kV Substation

66 kV Bus

9U

3 B

og

ga

bri

Ea

st

96

9 T

am

wo

rth

33

0

Ta

mw

ort

h 3

30

132 kV Bus

No.2 Capacitor No.1 Capacitor

87

7 K

ee

pit

Bo

gg

ab

ri M

ine

Byp

ass

88

L G

un

ed

ah

66

88

K G

un

ed

ah

66

87

5 T

am

wo

rth

13

2

(Re

tire

d)

330 kV Bus

Wo

lla

r

New work


New connection at Wollar 330

Gu

nn

ed

ah

330 kV Bus

We

lling

ton

New work

To 500 kV Bus

New connection at Tamworth 330

86

Arm

ida

le

84

Lid

de

ll

85

Arm

ida

le

88

Mu

sw

ellb

roo

k

No.1

Ca

pa

cito

r

330 kV Bus

No

.2 R

ea

cto

r

No.1

Re

acto

r

Gu

nn

ed

ah

33

0

New work


5.2 Option B: Wollar – Narrabri - Armidale 330 kV double circuit transmission line (+ 330 kV substations)

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132

Gunnedah

Narrabri

Inverell

Glen Innes

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8C8E

8L8M

96R

968

969

97A

97B

86

85

84

88

966

96C

965

87

13.6 kV

SVC



330 kV

132 kV

66 kV and below


Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East

9UJ

White Rock

Wind Farm

9UG

S

To Wollar

(~300km)

~230km


a) Narrabri – Moree – Mid-South Queensland 330 kV transmission lines OR

b) Armidale – Glen Innes – Tenterfield – South-East Queensland 330 kV transmission lines

c) Future: duplicate Wollar - Narrabri, turn 5A3 into Wollar


All transmission lines are to be constructed as double circuit with twin olive conductor.

~200km Wollar – Narrabri

~230km Narrabri – Tamworth


Substation works:

New Narrabri 330/132/66 kV station

96

8

Ta

mw

ort

h

96

M

Mo

ree

9U

3

Gu

nn

ed

ah

13

2

No.1

132/66kV

60MVA

To 66 kV

Bus

No.3

132/66kV

60MVA

To 66 kV

Bus

Wo

llar

Arm

ida

le

132 kV

Bus

330 kV

Bus

New work

Wo

llar

Arm

ida

le

New connection at Armidale 330

Co

ffs H

arb

ou

r

Du

ma

resq

SV

C

Ta

mw

ort

h

330 kV Bus

No.1

Re

acto

r

Ta

mw

ort

h

New work

Du

ma

resq

Na

rra

bri

Na

rra

bri



Na

rrab

ri

330 kV Bus

We

lling

ton

New work

To 500 kV Bus

Na

rrab

ri

5.3 Option C: Liddell – Tamworth – Gunnedah – Wollar and Tamworth - Tenterfield – Armidale 330 kV single circuit transmission line (+ 330 kV substations)

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132

Gunnedah

Narrabri

Inverell

Glen Innes

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8C8E

8L8M

96R

968

969 97A

97B

86

85

84

88

966

96C

965

87

13.6 kV

SVC



330 kV

132 kV

66 kV and below


Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East

9UJ

White Rock

Wind Farm

9UG

S

New line to

Liddell

(~140km)

~65km

~300km

New line to

Wollar

(~200km)

~190km


a) Tenterfield – South-East Queensland 330 kV transmission line






~300km Tamworth – Tenterfield

~190km Armidale – Tenterfield

Substation works:

Gunnedah 330/132/66 kV Substation

66 kV Bus

9U

3 B

og

ga

bri

Ea

st

96

9 T

am

wo

rth

33

0

Ta

mw

ort

h 3

30

132 kV Bus


87

7 K

ee

pit

Bo

gg

ab

ri M

ine

Byp

ass

88

L G

un

ed

ah

66

88

K G

un

ed

ah

66

87

5 T

am

wo

rth

13

2

(Re

tire

d)

330 kV Bus

New work

Wo

lla

r


New connection at Liddell 330

To

ST

N T

x

New work

330 kV Gen Bus

Ba

ysw

ate

r

Ba

ysw

ate

r330 kV Main Bus

Ne

wca

stle

To

ma

go

To

Ge

n T

xM

usw

ellb

roo

k

Ta

mw

ort

h

To

Ge

n T

x

To

Ge

n T

x

To

Ge

n T

x

To

ST

N T

x

Ta

mw

ort

h

Tenterfield 330/132/66 kV Substation

Lis

mo

re te

e

Ca

sin

o

Gle

n In

ne

s

To 22 kV

Bus

To 22 kV

Bus

Ta

mw

ort

h

132 kV

Bus

330 kV Bus

New work

Arm

ida

le


New connections at Tamworth 330

86

Arm

ida

le

84

Lid

de

ll

85

Arm

ida

le

88

Mu

sw

ellb

roo

k

No.1

Ca

pa

cito

r

330 kV Bus

No

.2 R

ea

cto

r

No.1

Re

acto

r

Gu

nn

ed

ah

33

0

New work

Lid

de

ll

Te

nte

rfie

ld


Gu

nn

ed

ah

330 kV BusW

ellin

gto

n

New work

To 500 kV Bus


New connection at Armidale 330

Co

ffs H

arb

ou

r

Du

ma

resq

SV

C

Ta

mw

ort

h

330 kV Bus

No.1

Re

acto

r

Ta

mw

ort

h

New work

Du

ma

resq

Te

nte

rfie

ld


5.4 Option D: Wollar – Gunnedah – Narrabri – Moree – Sapphire 330 kV double circuit transmission lines (+ 330 kV substations + 969 upgrade to double circuit 330 kV)

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132

Gunnedah

Narrabri

Inverell

Glen Innes

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8CFuture 8J

8L8M

96R

968

969 (upgrade to

330kV)

97A

97B

86

85

84

88

966

96C

965

87

13.6 kV

SVC



330 kV

132 kV

66 kV and below


Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East

9UJ

White Rock

Wind Farm

9UG

S

To Wollar

(~200km)

Future Sapphire

~95km

~100km

~185km

8E


a) Moree – Mid-South Queensland 330 kV transmission lines

b) Future: turn 5A3 into Wollar


All transmission lines are to be double circuit, 330 kV, strung with twin olive conductor:


~65km Gunnedah – Tamworth (969 uprate and double circuit)

~95km Gunnedah – Narrabri

~100km Narrabri – Moree

~185km Moree – Sapphire


Substation works:

New Gunnedah 330/132/66 kV station

66 kV Bus

9U

3 B

og

ga

bri

Ea

st

Sp

are

Ta

mw

ort

h 3

30

132 kV Bus


87

7 K

ee

pit

Bo

gg

ab

ri M

ine

Byp

ass

88

L G

un

ed

ah

66

88

K G

un

ed

ah

66

87

5 T

am

wo

rth

13

2

(Re

tire

d)

330 kV Bus

Wo

lla

r

New work

Ta

mw

ort

h 3

30

Wo

lla

r

Na

rra

bri

Na

rra

bri


New Narrabri 330/132/66 kV station 9

68

Ta

mw

ort

h

96

M

Mo

ree

9U

3

Gu

nn

ed

ah

13

2

To 66 kV

Bus

To 66 kV

Bus

Mo

ree

Gu

nn

ed

ah

132 kV

Bus

New work

Mo

ree

Gu

nn

ed

ah

330 kV Bus

Sapphire 330 kV switching station

Armidale

330 kV Transformer Bus

New work

330 kV A Bus

Dumaresq

To wind farm transformers

Moree

Moree

330 kV B Bus


New Moree 330/132/66 kV station

Inve

rell N

arr

ab

ri

To 66 kV

Bus

To 66 kV

Bus

Na

rra

bri

Sa

pp

hire

132 kV

Bus

330 kV

Bus

New work

Sa

pp

hire

Na

rra

bri

New connection at Wollar 330 G

un

ne

da

h

330 kV Bus

We

lling

ton

New work

To 500 kV BusG

un

ne

da

h


New connection at Tamworth 330

86

Arm

ida

le

84

Lid

de

ll

85

Arm

ida

le

88

Mu

sw

ellb

roo

k

No.1

Ca

pa

cito

r

330 kV Bus

No

.2 R

ea

cto

r

No.1

Re

acto

r

Gu

nn

ed

ah

33

0

(up

rate

96

9)

New work

Gu

nn

ed

ah


5.5 Option E: Wollar – Gunnedah, Gunnedah – Tamworth, Gunnedah – Armidale East, Tamworth – Armidale East, Armidale East – Sapphire 330 kV single circuit transmission lines (+ 330 kV substations)

S

SVC

To Liddell

Tamworth 330

Armidale

Dumaresq

Tamworth 132Gunnedah

Narrabri

Inverell

To Tenterfield

Bulli Creek

9U4

To Muswellbrook

To Koolkhan

To Coffs Harbour

To Kempsey

96T

96N

9U2

8CFuture 8J

8L8M

96R

968

969

97A

97B

86

85

84

88

966

96C

965

87

SVC

330 kV

132 kV

66 kV and below


Transformer

SVC

Reactor

Capacitor

Double Circuit Line

96M

Moree

9UH

9U3

Boggabri North

Boggabri East

9UJ

White Rock

Wind Farm

9UG

S

To Wollar

(~200km)

Future Sapphire

~185km

8E

Armidale East

~120km

~120km

~65km

~185km


a) Glen Innes –South-East Queensland 330 kV transmission lines

b) Future: turn 5A3 into Wollar





~185km Gunnedah to Armidale East

~120km Tamworth – Armidale East

~120km Armidale East – Sapphire


Substation works:

New Gunnedah 330/132/66 kV station

66 kV Bus

9U

3 B

og

ga

bri

Ea

st

Sp

are

Ta

mw

ort

h 3

30

132 kV Bus


87

7 K

ee

pit

Bo

gg

ab

ri M

ine

Byp

ass

88

L G

un

ed

ah

66

88

K G

un

ed

ah

66

87

5 T

am

wo

rth

13

2

(Re

tire

d)

330 kV Bus

Ea

st

Arm

ida

le

New work

Wo

lla

r

Sapphire 330 kV switching station

Armidale

330 kV Transformer Bus

New work

330 kV A Bus

Dumaresq

To wind farm transformers

ArmidaleDumaresq

330 kV B Bus

Armidale East


New Armidale East 330 kV switching station

Armidale East 330 kV switching station is to be established somewhere along 87 transmission line, close to

existing Armidale substation. It could be adjacent to the existing substation or further away if a short section of

330 kV transmission line is not preferred.

Sapphire

Coffs Harbour

330 kV B

Bus

New work

330 kV A

Bus

Armidale

Tamworth

Gunnedah


Gu

nn

ed

ah

330 kV Bus

We

lling

ton

New work

To 500 kV Bus


New connections at Tamworth 330

86

Arm

ida

le

84

Lid

de

ll

85

Arm

ida

le

88

Mu

sw

ellb

roo

k

No

.1 C

ap

acito

r

330 kV Bus

No.2

Re

acto

r

No

.1 R

ea

cto

r

Gu

nn

ed

ah

New work

Arm

ida

le E

ast

Bay rename at Armidale 330

Arm

ida

le E

ast

Du

ma

resq

SV

C

Ta

mw

ort

h

330 kV Bus

No.1

Re

acto

r

Ta

mw

ort

h

New work

Du

ma

resq

The same bay rename will also be required at Coffs Harbour substation.


6. Recommendation

It is recommended that options be considered to address the identified need/opportunity and further progressed to

undertake Option Feasibility Studies.

It is also recommended that TransGrid propose a contingent project for the transmission network developments in

New South Wales north western area in the revised revenue proposal for 2018-2023. The contingent project would

have the following triggers:

(a) New generation more than 800 MW is committed in North Western NSW (north of Bayswater and Liddell)

(b) Two or more of the following:

(i) Inclusion of renewable energy zones in North Western NSW in AEMO’s Integrated Grid Plan or similar

plan as recommended by the Independent Review in to the Future Security of the National Electricity

Market by Professor Alan Finkel and accepted by the COAG Energy Council

(ii) Notification to TransGrid by the Federal Government, COAG Energy Council, NSW Government or the

Energy Security Board that it considers that augmentation of the transmission network to deliver increased

capacity from North Western NSW is required in order to meet or manage the expected demand for

prescribed transmission services or comply with an applicable regulatory obligation or requirement

associated with the provision of prescribed transmission services

(iii) Successful completion of a RIT-T or alternate framework introduced in response to the recommendation of

the Independent Review in to the Future Security of the National Electricity Market by Professor Alan

Finkel and accepted by the COAG Energy Council (including comprehensive assessment of credible

options) demonstrating that increasing capacity of the network in North Western NSW at 330/132kV or

other voltages used in future is the option that maximises the positive net economic benefits

(iv) Determination by the AER that the proposed investment satisfies the RIT-T or abovementioned alternate

framework

(c) TransGrid Board commitment to proceed with the project subject to the AER amending the revenue

determination pursuant to the Rules.

The trigger is specific and capable of objective verification, relates to a specific location or locations, and is

probable but too uncertain to include the proposed contingent project in the forecast capital expenditure in this

proposal.

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