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3 What is AFC Methodology? ATC Path Methodology (prior to April 1) ATC - Available Transfer Capability Control Area to Control Area (Path) capability calculation Transfers studied for each Path and a limit is determined for that Path - Total Transfer Capability (TTC) Key Aspect: assumes all power from one Control Area to another flows on that path
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Duke Energy CarolinasTransition to AFC
MethodologyStakeholder Meeting
Independent Entity ServicesThursday, March 17, 2011
2:00 to 3:00 p.m. EDT
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Agenda What is AFC Methodology?
Flowgate Method vs. Contract Path Introduction to Duke’s Process Business Practice Changes Transition Expectations Analytical Tools Wrap-up
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What is AFC Methodology? ATC Path Methodology (prior to April 1)
ATC - Available Transfer CapabilityControl Area to Control Area (Path) capability calculationTransfers studied for each Path and a limit is determined for that Path - Total Transfer Capability (TTC)Key Aspect: assumes all power from one Control Area to another flows on that path
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What is AFC Methodology?AFC Methodology (post April 1)
Available Flowgate Capability (AFC)Flowgates are pre-determined points on the system where problems have been seen or are expected to occurControl Area to Control Area transfers studied against a pre-determined set of transmission limiters – flowgatesAFC values are compiled into an Effective ATC for path postingsKey Aspect: AFC based on how power actually flows
Introduction to Duke’s Process
Increased Coordination with NeighborsLoad Forecasts & OutagesTSRs & TagsFlowgates & AFC Overrides
Two-Part ProcessModel BuilderATC Calculator
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Introduction to Duke’s Process
Model BuilderBuilds model snapshotsCalculates base-flows & shift factors
ATC CalculatorCalculates posted ATC (Effective ATC) as the
minimum of:Available Contract Path capabilityAvailable flowgate capability
Utilizes base-flows & shift factors from Model Builder
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Business Practice Changes
Business Practice 1 - Changed Who to Call > TTC/ATC
Reference to ATC/TTC or TTC/ATC change to ATC Reference to Total Transfer Capability (TTC) change to Total Flowgate
Capability (TFC) ATC Information Page
Reference to ATC/TTC or TTC/ATC change to ATC Business Practice 2.E - Changed
NAESB Business Practice Standards Incorporated as filed in Duke Energy Carolinas OATT Section 4.2; effective
April 1, 2011 Business Practice 3.A.v - Changed
ATC changed to ATCID - hyperlink to OASIS Homepage Posting; April 1, 2011
Business Practice 3.E - Eliminated NAESB BP 001-8.2 Queue Flooding
Business Practice 7.C.i (a) – Changed (TTC= 0 Contract Path = 0)
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Transition Expectations Scheduled Transition Date & Hour
March 29, 2011@ (Time-TBD) Dead-band on Processing
Approximate duration (TBD) Queued Requests during Transition
Processed manually on OASIS Submitted Tags
Processed manually Assessment of Open Requests
Accepted or Counteroffered Requests Honored
Rebids will be evaluated using AFC Methodology Request in the evaluation phase
Queued through Study will be evaluated using AFC Methodology
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Analytical ToolsOASIS Development System
webOASIS Demo Node Login ( http://demo.oatioasis.com/ )Offerings
Accessed on OASIS by clicking Effective ATC
Available Contract Path capability vs. Available flowgate capability
No change to your analysis Outages
Accessed on OASIS from the Security Template by clicking No change to your analysis
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Wrap-upProposed Next Quarterly Stakeholder
MeetingFriday, May 13, 2011 – 2 p.m. to 3 p.m. ET
Customer Suggested Topics?This is the forum for discussing emergent topics
Questions and Comments
