Wyoming Collector and Transmission System
Conceptual Design
Presented to:
Wyoming Legislative Task Force on Wind Energy
May 27, 2010
Casper, Wyoming
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Presentation Content
• Background
• Study Goals, Assumptions, Limitations
• Transmission Export Lines and Hubs
• The Conceptual Collector System
• Wind Resource Development
p
Scenarios
• Collector System Conceptual Design
• Potential Use of Existing Rights-of-Way
Rights of Way
• Preliminary Estimate of Collector System Cost
• Conclusions
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Background
•
Wyoming
y
g has abundant supply
pp y of wind,, natural gas,
g , coal
•
Other States have demand for renewable energy
•
Wyoming’s transmission system is limited
•
Multiple transmission export lines are proposed in Wyoming
•
Collector system1 could connect generation to transmission lines
1Wyoming
Collector and Transmission System Conceptual Design Report
published February 2010. Available online:
p
y
g
p
http://wyia.org/documents/reports/
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Background: Qualified Resource Areas (QRAs)
Source: WREZ Phase 1
Report 2009
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Background: Qualified Resource Areas (QRAs)
• Sized in proportion to the total amount of electricity (in terawatt-hours) that could be
produced over the course of one year.
• Exclude select protected (e.g., wilderness) areas but do NOT consider numerous
environmental constraints such as sage grouse and National Forests, or construction
logistics, costs, or permitting.
• Not intended to suggest that renewable development should be precluded elsewhere in
the state or that significant conflicts do not occur in the vicinity of the Wyoming hubs.
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Collector System Study Goals
•
Develop conceptual design for a collector system and
test reliability of connecting up to 12,000 Megawatts
(MW)1 of wind generation in Wyoming to proposed
transmission export
p lines.
•
Take a reasonable first look at conceptual collector
designs
g and estimate p
preliminary
y costs.
12,000 MW (1GW) is:
–
–
–
1 1,000
Sufficient to supply power for 6 – 12 million homes
About four times the 2008 Annual Peak Demand in Wyoming
Almost seven times the total capacity of Laramie River Station
kilowatts (kW) = 1 megawatt (MW) = 1 gigawatt (GW)
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Collector System
y
Study
y Unknowns
• Where will wind be developed in Wyoming?
• When will wind be developed in Wyoming?
• How much wind will be developed in Wyoming?
• No
N similar
i il collector
ll t systems
t
tto copy.
• Starting with concept.
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Collector System Study Assumptions
•
•
•
•
•
•
Wind Farms (WFs) – generate 300-400 MW each
WF are developed
WFs
d
l
d within
ithi Q
Qualified
lifi d Resource
R
Areas
A
(QRAs)
(QRA )
Wind Hubs (WHs) – collect up to 5 WFs for 2.0 GW capacity
40 miles of >230 kV line between WF and WH substations
Transmission Export Hubs (TEHs) capacity – up to 3.0 GW
TEH locations identified by transmission proponents
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Collector System Study Limitations
• Does not predict or recommend where, when, or how much wind energy is
developed.
developed
• Wind development scenarios in the report are conceptual.
• Report only illustrates how wind could be collected once it is developed
developed.
• Study designs are conceptual and do not consider on-the-ground constraints.
• T
Transmission
i i lilines ffrom WF
WFs to
t WHs,
WH and
d from
f
WHs
WH to
t TEHs,
TEH are conceptual
t l
and assumed to be straight lines; actual routes and distances may vary.
given to transmission line routing
g which must consider Right-ofg
• No consideration g
Way requirements, costs, environmental and land use constraints, and other
factors.
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Transmission Export Lines – Starting Point
for Collector System Study
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Transmission Export Lines - Capacity
Transmission Project
Capacity
(Megawatts)
Gateway South (PacifiCorp)
1,500
Gateway West (PacifiCorp)
1,500
O l d Intertie (LS
Overland
( S Power Development,
l
LLC)
C)
2 000
2,000
Wyoming-Colorado Intertie (LS Power Development, LLC)
900
Trans West Express (Anschutz Corporation)
3,000
Zephyr (TransCanada)
3,000
Total
11,900
NOTE: Capacities are based on thermal ratings and do not represent simultaneous system rating. Capacity for each project
provided by transmission proponents. Capacities are representative values which may change based on final path rating.
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New DC line
New 500kV
New 345kV
Abbreviations
MW: Megawatt
kV: Kilovolt
DC: Direct Current
Transmission Export Lines
Windstar 500kV
New 230kV
Windstar 230kV
Existing line
Zephyr (3,000 MW)
New substation
Zephyr 500kV
Existing substation
Tri-Cnty 230kV
Casperpp 230kV
Dave John 230kV
Yellow Ck 230kV
Miraclem 230kV
Hartzog 230kV
Zephyr 345kV
Overland (2,000 MW)
Midpoint 500kV
Chugwater 500kV
Midpoint 345kV
Midpoint 230kV
A l 500kV
Aeolus
Dificult 230kV
Miners 230kV
Platte 230kV
Aeolus 230kV
Idaho
100
100
100
100
790
T Borah
To
B h
Populus 500kV
Bridger 500kV
Populus 345kV
Bridger 345kV
MW
MW
MW
MW
MW
Bridger #1
Bridger #2
Bridger #3
Bridger
g #4
Bridger #5
TWE-WY 230kV
Bridger 230kV
Threemile Knoll 345kV
To Goshen (Idaho)
Mustang 230kV
Pt Rocks 230kV
Rock Springs 230kV
Wind River 230kV
300 MW Ln Bronc
Bridger 34kV
Laramie River 345kV
Gateway South
(1 500 MW)
(1,500
TransWest Express (3,000 MW)
Nevada
Ault 345kV
Archer 345kV
Gateway West (1,500 MW) TWE-WY 500kV
Eldorado 500kV
Utah
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Laramie River 230kV
Dave John 230kV
Stegall 230kV
Wyoming-Colorado
Intertie (900 MW)
Mona 500kV
Mona 345kV
Pawnee 345kV
Colorado
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Transmission Export Hubs - Capacity
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The Collector System – A Concept
High Capacity
Export Line
500/34.5 kV
Transformer
Wind
Collector
System
TEH
Substation
500 kV at
$2 million/mile
WH – TEH
line
500/230 kV transformer
at $15 million
500 kV
Substation
at $75 million
WF1 – WH
230 kV line
WF2 – WH
230 kV line
500/230 kV
Transformer
Wind Hub
Substation
40 miles of 230 kV WF3 – WH
at $1 million/mile 230 kV line
WF4 – WH
230 kV line
230/34.5 kV
Transformer
230/34.5 kV
Transformer
230/34.5 kV
Transformer
230/34.5 kV
Transformer
34.5 kV WF1
POI Bus
34.5 kV WF2
POI Bus
34.5 kV WF3
POI Bus
34.5 kV WF4
POI Bus
Wind Farm 3
300–400 MW
Wind Farm 4
300–400 MW
Wind Farm 1
300–400 MW
Wind Farm 2
300–400 MW
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Wind Farm
Substation
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The Collector System – A Concept
WF2
• Connects wind farms to interstate
t
transmission
i i lilines
WF3
WF4
WF5
WF1
WHa
TEH1
WF12 WF13
WF11
WHc
WF14
WF15
TEH2
Note:
N
t Blue
Bl components
t are included
i l d d iin
collector system cost estimate.
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Two Conceptual
p
Collector System
y
Designs
g
Radial
Networked
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Wind Resource Development Scenario #1
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Wind Resource Development Scenario #1
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Wind Resource Development Scenario #2
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Wind Resource Development Scenario #2
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Resource Development Scenarios
Wind Development
Area
Resource Scenario #1
South Central
Resource Scenario #2
6,400
0
800
2,400
East Central
2,400
2,400
East of Laramie Range
1,600
6,400
800
800
12,000
12,000
North East
South East Wyoming
Border
TOTAL
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Illustrative Collector System Design - Radial
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Illustrative Collector System Design - Networked
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Conceptual
p
Design
g Type
yp Characteristics
Characteristics
Single CircuitRadial
Double CircuitRadial
Networked
TEH
Pathways
WF
WF
WH
WF
TEH
WH
WH
TEH
TEH
TEH
Cost
Lower
Higher
Higher
Reliability
Lower
Medium (common
corridor outages
still very likely)
Higher
Market Liquidity
(Access to
TEHs)
Lower (only
( l to
one TEH)
Lower ((only
l to one
TEH)
Higher
h (multiple
(
l l
TEHs)
Notes:
Single circuit – single line
Double circuit – two parallel lines
Can have two lines (circuits) on same tower but ICF study
assumes two separate towers for double circuit.
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Potential Use of Existing Rights-of-Way
Line No.
Collector System Transmission Line
Possibility to use any existing ROW?
Existing ROW
1
230 kV WH1 to Windstar
Yes
230 kV Yellow Cake to Dave Johnston
2
3
4
5
6
7
8
9
10
230 kV WH1 to WH5
230 kV WH2 to WH5
500 kV WH5 to WH6
500 kV WH5 to Aeolus
230 kV WH6 to LRS
345 kV WH2 to LRS
500 kV WH6 to Chugwater
500 kV WH3 to Chugwater
500 kV WH3 to WH4
No
No
No
No
No
Yes
No
No
No
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500 kV WH4 to WH10
Yes
‐
‐
‐
‐
‐
230 kV Ault to LRS
‐
‐
‐
115 kV Spring Creek to Gem City to Snowy
115 kV Spring Creek to Gem City to Snowy Range to Laramie to Oasis
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500 kV WH10 to WH9
Yes
115 kV May115 to Oasis to Medicine Bow
13
14
500 kV WH10 to WH8
500 kV WH8 to TWE‐WY
No
Yes
‐
34.5 kV Ft. Steele to Platte
15
500 kV WH9 to Aeolus
Yes
115 kV Medicine Bow to Miracle Mile
16
500 kV WH7 to TWE‐WY
Yes
115 kV Miracle Mile to Platte
17
500 kV WH7 to Aeolus
500
o eo us
Yes
es
115 kV Medicine Bow to Miracle Mile
5
ed c e o o
ac e
e
kV
LRS
No.
Kilovolt
Laramie River Station
Number
ROW
TWE
WH
Right‐of‐Way
TransWest Express, LLC
Wind Hub
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Preliminary Estimate of Collector System Cost
Cost Estimates
Collector System Configuration
g
(nominal $ billions)
Design Type
Approximate Total Line Miles
Resource Resource
Scenario #1
Resource Resource
Scenario #2
Resource Resource
Scenario #1
Resource Resource
Scenario #2
Single Circuit
$2.48
$2.84
1,460
1,709
Double Circuit
$3.34
$3.90
1,840
2,178
Minimal Double Circuit
$2.93
$3.39
1,683
1,914
M l i l D bl Ci i
Multiple Double Circuit
$3 13
$3.13
$3 52
$3.52
1 508
1,508
1 666
1,666
Version 1
$3.07
$3.55
1,721
2,039
Version 2
Version 2
$3 14
$3.14
$3 75
$3.75
1 530
1,530
1 832
1,832
$3.35
$3.89
1,604
1,903
Radial
Networked WHs
Minimal Double Networked WHs Circuit
and TEHs
Multiple Double Circuit
TEH
WH
Transmission Export Hub
Wind Hub
Wind
Hub
Note: Mileage
N
Mil
estimates
i
are approximate,
i
and
d based
b
d on straight
i h li
line
calculations. The estimates do not account for land use, environmental, and
other constraints.
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Conclusions
• Reliable collector systems capable of transferring 12
GW of wind out of Wyoming were designed in concept.
• The designed systems will withstand rigorous
contingencies of the collector network elements without
significant overloads on the existing network.
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Thank You
Robert J. Henke
ICF International
303-792-7810
[email protected]
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