Buffalo Ridge Incremental Generation Outlet
Transmission Study
Presentation to
MAPP Missouri Basin Subregional Planning Group
(MB-SPG)
At MRES Offices
Sioux Falls, SD
October 28, 2004
Richard Gonzalez, PE
Excel Engineering, Inc.
Jason Standing
Xcel Energy
Outline
 Purpose/Goal
 Scope of Study
 Assumptions/Methods
 Participants’ Roles
 Schedule
Purpose/Goals
Investigate feasibility of an “Interim Step” transmission
plan for achieving several hundred MW of additional
Buffalo Ridge generation outlet capacity
Build upon knowledge from previous SW MN/SE SD Study
Formulate & Evaluate transmission Options
 of reasonable $/kW cost
 of modest magnitude
 implementable in 4-5 yrs
 compatible with probable long-range developments
Keep wind development active while…
-- long-range regional studies progress to completion
-- transmission entities & other interested parties reach
agreement on a long-range development
Scope of Study
Perform technical analysis (powerflow)
 Identify “existing system” limitations
(post-“825 MW” facilities)
 Formulate transmission Options to increase SW
MN/Eastern SD Buffalo Ridge generation outlet
capacity
o no “Mega” Transmission Projects
o anticipated to be mainly 115 kV improvements
(reconductors, 69115 kV conversions, new 115 kV)
 Evaluate Options’ Electrical Performance
o system intact
o first contingency (“n-1”)
(including double circuits & breaker failures)
o Losses
o Voltage Stability/Reactive requirements
o Constrained Interface (flowgate) impacts
Perform economic analysis
 Develop cost estimates (+ 30%)
 Calculate Present Worth of loss differences
 Show cost as function of outlet MWs acheived
Document analyses in Study Report
Assumptions/Methods
Start with MISO Group II model (2007 Summer)
Study peak and off-peak load/transfer conditions
peak
off-peak
Local load:
100%
70-80%
NDEX:
moderate
high
Anson gen MW:
402
0
Lakefield GRE gen MW:
??
??
Other generation projects:
??
??
Buffalo Ridge generation additions presumed to be
50% on North (Yankee)
50% on South (Fenton)
Use PSS/E activity “TLTG” or MUST equivalent to identify
thermal limiters
Perform ACCC & Q-V analyses to identify reactive needs
Participants’ Roles
Xcel Energy:




Perform technical & economic analyses
Coordinate progress meetings
Present updates
Develop draft & final reports
Others:






Designate contact person for study
Provide model review & comments
Help formulate transmission options
Review technical & economic analysis methods,
results
Help formulate conclusions & recommendations
Review draft Study Report
Schedule (Preliminary)
Kick-off meeting
Oct 28, 2004
Progress meeting
Nov 22, 2004
Progress meeting
Dec 21, 2004
Issue Draft Report
Dec 31, 2004
Issue Final Report
Jan 17, 2005
Later Steps:
 Go / No-Go Decision
 Propose to MISO