Common Use System
Q3 TCPC Meeting, October 13, 2015
Black Hills Power Service Center
Rapid City, SD
10/12/2015
TCPC Meeting Overview
•Introductions
•Meeting Policies
•10 Year Transmission Plan
•2015 Study Scope
•Load and Resources for Study Cases
•Preliminary Powerflow Results
•Preliminary Recommendations
•Next Steps
•Stakeholder Input and Questions
2
TCPC Meeting Policies
FERC Standards of Conduct
• The FERC Standards of Conduct state that Transmission Function Employees
are prohibited from disclosing non-public Transmission Information unless
they disclose it on the OASIS. Also, Transmission Function Employees and
Shared Employees are expressly prohibited from disclosing non-public
information to Energy or Marketing Affiliates.
Anti-Trust Policy
• It is the committee’s policy to comply with all state and federal anti-trust laws.
One objective of the TCPC is top promote or enhance competition. Careful
attention should be paid to any discussions regarding you or your competitors
prices, allocation of markets, customers, or products, limiting production, and
excluding dealings with other companies.
Confidentiality
• Certain information may be protected as confidential due to Standards of
Conduct concerns or because it is classified as Critical Energy Infrastructure
Information. Otherwise, it should be on the OASIS. Committee members
agree not to share committee activities with the press and do not discuss
ideas or concerns other than your own in a public forum.
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Common Use System and Study Area
MONTANA
WYOMING
SHERIDAN
TONGUE
RIVER
BILL DURFEE
CARR
DRAW
BUFFALO
BARBER
CREEK
PUMPKIN
BUTTES
LOOKOUT
DRYFORK
WYODAK
WYGEN1
WYGEN2
WYGEN3
YELLOW
CREEK
HUGHES
DONKEY
CREEK
RENO
TECKLA
LANGE
OSAGE
SOUTH
RAPID
CITY
MINNEKHATA
DC TIE
WESTHILL
ANTELOPE
S DAKOTA
NEBRASKA
YELLOWCAKE
LATIGO
CASPER
SPENCE
WINDSTAR
230 KV (EXISTING)
230 KV (FUTURE)
SUBSTATION
GENERATOR
DAVE
JOHNSTON
STEGALL
10/12/2015
CUS
BEPW
PAC
WAPA
4
2015 10 Year Transmission Plan
Project
ISD
Status
Teckla-Osage 230kV Line (BHP)
2016
Planned
Osage-Lange 230kV Line (BHP)
2016
Planned
Second Yellow Creek 230/69kV Transformer
(BHP)
2018
Planned
Bill Durfee 230kV Substation (PREC)
2015
Under
Construction
South Rapid-West Hill 230kV Line Rebuild
(BHP)
2019
Proposed
Wyodak Transformation
TBD
Planned
Osage Transformation
TBD
Planned
10/12/2015
5
2015 LTP Study Scope
2017 HS (Year 2)
• Power Flow & Transient Stability
2017 LS (Near Term)
• Power Flow & Transient Stability
2020HS (Year 5)
• Power Flow, Transient Stability & Short
Circuit
2024HS (Far Term)
• Power Flow & Voltage Stability
Observe NERC/WECC planning criteria
Evaluate P0 thru P7 Contingencies
10/12/2015
6
Load and Resources for
Study Cases
• 2017 Heavy Summer
o
o
Starting Case RMOSG 2015 Heavy
Summer
CUS System Demand = 991MW
• 2017 Light Spring
o
o
Starting Case WECC 2017 Light Spring
CUS System Demand = 442MW
• 2020 Heavy Summer
o
o
Starting Case WECC 2020 Heavy Summer
CUS System Demand = 1025MW
• 2024 Heavy Summer
o
o
10/12/2015
Starting Case WECC 2024 Heavy Summer
CUS System Demand = 1067MW
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Wyodak Transformation
• 17HS N-1-1 (P6) Loading of 100%
• 20HS N-1-1 (P6) Loading of 104%
• 24HS N-1-1 (P6) Loading of 102%
Osage Transformation
• No Summer Overload identified
10/12/2015
8
Rapid City Transformation
Lange #1 Transformer
•
•
•
•
17HS N-1-1 (P6) Loading of 190%
17LSP N-1-1 (P6) Loading of 115%
20HS N-1-1 (P6) Loading of 172%
24HS N-1-1 (P6) Loading of 159%
Lange #2 Transformer
• 17HS N-1-1 (P6) Loading of 129%
• 20HS N-1-1 (P6) Loading of 124%
• 24HS N-1-1 (P6) Loading of 109%
10/12/2015
9
Rapid City Transformation
South Rapid Transformer
• 17HS N-1-1 (P6) Loading of 123%
• 20HS N-1-1 (P6) Loading of 114%
• 24HS N-1-1 (P6) Loading of 105%
10/12/2015
10
Cheyenne Prairie
Generating Station
Rapid City Line Overloads
Lange-Lookout 230kV Line Loading
• 17HS N-1-1 (P6) Loading of 102%
• 20HS N-1-1 (P6) Loading of 102%
Lange-South Rapid 230kV Line Loading
• 17HS N-1-1 (P6) Loading of 100%
Osage-Teckla 230kV Line Loading
• 17HS N-1-1 (P6) Loading of 99%
• 20HS N-1-1 (P6) Loading of 100%
10/12/2015
11
Preliminary Results Summary
• There is insufficient 230/69kV transformation capacity at
Wyodak following a N-1-1 contingency. Local generation
is required.
• There is insufficient 230/69kV transformation capacity at
Lange and South Rapid following a N-1-1 contingency.
Local generation is required.
• The Lange-South Rapid, Lookout-Lange, and Osage
Teckla 230kV lines cannot support the Rapid City load
with the RCDC Tie at 200MW W-E following N-1-1
contingencies.
10/12/2015
12
Preliminary Recommendations
• Proceed with the study for increasing the Wyodak and
Osage 230/69kV transformation.
• Proceed with the Teckla-Osage-Lange 230kV line and
second Yellow Creek Transformer.
• Explore options for relieving Rapid City 230/69kV
transformation constraints.
• Revise Rapid City DC tie RAS to include identified N-1-1
contingencies.
• Continue with the South Rapid-West Hill 230kV rebuild
10/12/2015
13
Next steps
•Review any additional Stakeholder input
•Complete powerflow and transient stability analyses and
compile final results
•Complete and distribute draft Report
•Update LTP on study results and recommendations
Next Meetings
Q4 Meeting: December 17th, 2015
o Review final comments to draft LTP report, preferred project
alternatives, planned project status, other regional planning
updates
Additional stakeholder discussions may be held as
necessary
10/12/2015
15
Questions
10/12/2015
Comments / Suggestions
Wes Wingen
wes.wingen@blackhillscorp.com
(605) 721-2268
Jon Cichosz
jon.cichosz@blackhillscorp.com
(605) 721-1704
10/12/2015
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