1. Use of EDWG Data by the LTPT
WECC Staff
January 15, 2016
Western Electricity Coordinating Council

2. Western Electricity Coordinating Council
What is the LTPT?
The LTPT - Long Term Planning Tool:
Is a capital expansion tool
20 year study horizon
Evaluating potential energy future
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3. Western Electricity Coordinating Council
LTPT
LTPT comprised of:
SCDT-Study Case Development Tool
NXT-Network Expansion Tool
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4. Western Electricity Coordinating Council
SCDT
SCDT - Study Case Development Tool
Produce Study Case
Optimized study case representing potential “energy future”
Comprised of reduced nodal network model
Transmission expansion candidate lines
Transmission capital cost
Minimum cost generation optimization-decision factors, constraints
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5. Western Electricity Coordinating Council
NXT
NXT - Network Expansion Tool
Relieves candidate lines for four system conditions Heavy Summer, Light Spring, Light Fall, Heavy Winter, oveloaded, loss of load etc
Optimized transmission network expansion
Mitigating engineering constraints
Grid cost components applicable to study case
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6. LTPT Process Workflow Perform ModelingNo
Yes
Define Scenarios to be examined in narrative
Parameterize Scenarios / Sensitivities
Does Parameterization affect Scenario narrative?
Are results reasonable?
Select ‘no regrets’ investments; decide other recommendations
Compare Scenario results based on pre-determined Metrics
Are sensitivities of Scenarios required?
Define Metrics to be used to evaluate Scenario/Sensitivity results
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7. 10-Year & 20-Year Planning Comparison
Attribute
10-Year Studies
20-Year Studies
Tool
Production Cost Model
Capital Expansion Model
Objective Minimization
Production Cost
Capital Cost
Focus
Capacity additions and specific projects, planned and in progress
Understanding potential “energy futures” and decisions needed to achieve those futures
Model decides to
Dispatch Generation
Build Gen and Transmission
Load
From balancing authorities w/ stakeholder adjustment
Resources
Stakeholder specific
Stakeholder specific and LTPT optimized
Transmission
Time Granularity
Hourly / Sub-hourly
Annual / Seasonal Load Durations
Interdependence
Starting point of 20-Year
Informs 10-Year
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8. Western Electricity Coordinating Council
EDWG Data in LTPT
EDWG Data in LTPT
Transmission route finding input
No Siting
More realistic cost estimate
Environmental Risk
Line weighting-Financial Element
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9. Western Electricity Coordinating Council
Risk Weightings
EDWG Risk Category Weightings
Think of the weighting similar to miles
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10. Traversing the geospatial landscape
Staying in the fairway.
Avoiding hazards.
Minimizing strokes.

11. Overlay EDWG and Transmission Candidate Cooridors
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12. Western Electricity Coordinating Council
Optimize Corridors
Build cost surfaces
Bend corridor routing to minimize environmental impact.
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13. Transmission Models and Assumptions
Start with TEPPC 2024 Power Flow Model
Delineate load and generation hubs.
Perform Network Reduction, preserving interface and CCTA transmission lines.
Define aggregation zones delineated by WECC Paths.
Define list of monitored lines based on aggregation zones.
Define transmission technology types and characteristics.
Define list of candidate corridors based on tiered rules.
Optimize corridor routing
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14. Economic Models and Assumptions
Fuel Prices
Henry Hub per EIA Annual Energy Outlook (converted to 2014 dollars)
Differentials by state
Progress multipliers per E3 Capital Cost Tool/Report
Resource Types & Costs
Capital Cost: E3 Capital Cost Tool (“E3 Tool”), TEPPC approved
Future types & Progress multipliers Vintage per E3 Tool
Simplified LCOE Model - E3 Tool
Policy
CO2 Price: $37.11/MT
Per stakeholder input – Metric Definition Task Force (MDTF)
No PTC, Solar ITC reduced to 10%
Per E3 forecast of federal policy
Coal constraints per stakeholder input
Transmission Costs
Per TEPPC Capital Cost Update: B&V analysis/report and tool, with stakeholder review/approval
Includes Transmission and Substation Costs
Cost Factors Include: Equipment Terrain ROW AFUDC Breakers Transformers Voltage Compensation
LCOE per E3 “levelization calculation” (E3 Captial Cost Tool)
EIA – U.S. Energy Information Administration
AEO – Annual Energy Outlook
DG – Distributed Generation
RPS – Renewable Portfolio Standard
NREL – National Renewable Energy Laboratory
PTC – Production Tax Credit
ITC – Investment Tax Credit
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15. Focus on Inter-regional needs
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16. Western Electricity Coordinating Council
Tool Enhancements
Introduction of Corridor Library
Parameterized Goals
Parameterized Constraints
Co-optimization across seasonal and load level conditions
Improved reduced network model
Western Electricity Coordinating Council