Download Buffalo Ridge Incremental Generation Outlet (BRIGO) Transmission

Buffalo Ridge Incremental
Generation Outlet (BRIGO)
Transmission Study
Presentation to National Wind
Coordinating Committee
June 22, 2005
W Grivna, PE of Xcel Energy
R Gonzalez, PE of Excel Engineering, Inc.
Outline
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Study Purpose/Goals
Background
Participants
Analysis
Results
Conclusions/Recommendations
Next Steps
Study Purpose/Goals
• Determine feasibility of increasing Buffalo Ridge
area generation outlet…
• by several hundred MW…
• through “modest” (presumably 115 kV-class)
improvements…
• that could be relatively quickly implemented…
• while plans for future long-range regional
transmission projects continue their evolution.
Background
• Buffalo Ridge is the premier wind resource in
MN/SD
• Transmission improvements under way to increase
outlet capacity to 825 MW
• Further interest confirmed by MISO & WAPA
interconn queues
• Xcel Energy has had specific MW & Energy %
mandates
• All other Minnesota power suppliers now also
have renewable energy obligations
• Result: Intense interest in wind development on
the Ridge
Transmission map of Buffalo
Ridge Area
Study Participants
• Sponsor: Xcel Energy
• Technical & Economic Analyses performed
by Xcel Energy
Reviewers/technical support:
(MAPP MB SPG)
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Western Area Power Administration
Otter Tail Power
Missouri River Energy Services
MISO
Marshall Municipal Utilities
Great River Energy
East River Electric Power Cooperative
Alliant Energy
State regulators (MN/ND/SD)
Energy Policy Groups (Wind on the Wires)
IPPs
Analysis
• Powerflow: Concentrate on 2007, summer offpeak condition
– System intact
– First contingency (“n-1”)
• Requirement: satisfy applicable voltage and
loading criteria
• Identify “existing system” (post-825 MW
additions) outlet limits for Buffalo Ridge
Mpls/St Paul deliveries
• Formulate transmission options
• Test Options’ performance
– Electrical
– Financial
Cost versus Outlet for Options
Complications
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Reactive power requirements/Voltage Stability
Power and Energy losses
Load-serving considerations
Constructability
MISO-WAPA interface
North Dakota Export (NDEX) interface
Geographic extent of Ridge
Results
• All Options can achieve 300-500 MW of
incremental outlet
• Some Options require extensive additional
improvements
– Line reconductors & rebuilds
– Transformer replacements
– Shunt capacitor additions
• Incremental energy losses are high (25 – 30%)
• The “best” Options all include a second
(independent) Fenton-Nobles Co 115 kV outlet
path to the new 345 kV
Conclusions/Recommendations
• Implement “Option 31A”
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2nd Nobles Co 345/115 kV transformer
2nd Nobles Co-Fenton 115 kV line
Lake Yankton-Marshall 115 kV line
Several shunt capacitor banks
Misc reconductors, equipment upgrades
• Capable of providing 300 - 500 MW of
incremental outlet (beyond 825 MW level) at
reasonable cost
• Provides some incidental load-serving benefits
Map of Option 31A
Next Steps
• Coordinate & confirm compatibility with likely
long-range plans & identified projects
– CapX
– Big Stone 2
– MISO NW Exploratory
• Address adaptation to specific proposed wind gen
projects
• (Need “Yankee fix” if MWs on north Ridge
exceed critical level)
• Coordinate with MISO stability study results
• Initiate permitting process