Steve Rueckert Director of Standards

1. Steve RueckertDirector of Standards TPL-001-4 Discussion – PCC Steering Committee March 25, 2014

2. Discussion • WR1, WR2, WR4, and WR5 are approved for retirement upon the effective date of TPL-001-4 • What do we want to do with WR3 • Do Requirements R5 and R6 in TPL-001-4 -address the current obligations identified in TPL-001-WECC-CRT-2.1, WR# • Do Western Stakeholders want a WECC-wide set of requirements for TPL-001-4, R5 and R6 or do they want to define acceptable performance for their own system

3. TPL-001-WECC-RBP-2.1, WR3 WR3. Reactive power resources, with a balance between static and dynamic characteristics, shall be planned and distributed throughout the interconnected transmission systems to ensure system performance as defined below: 3.1. For transfer paths, voltage stability is required with the pre- contingency path flow modeled at a minimum of 105% of the path rating for system normal conditions (Category A) and for single contingencies (Category B). For multiple contingencies (Category C), post-transient voltage stability is required with the pre- contingency transfer path flow modeled at a minimum of 102.5% of the path rating. 3.2. For load areas, voltage stability is required for the area modeled at a minimum of 105% of the reference load level for system normal conditions (Category A) and for single contingencies (Category B). For multiple contingencies (Category C), post- transient voltage stability is required with the area modeled at a minimum of 102.5% of the reference load level. For this criterion, the reference load level is the maximum established planned load limit for the area under study. 3.3. Specific requirements that exceed the minimums specified in 3.1 and 3.2 may be established, to be adhered to by others, provided that technical justification has been approved by WECC’s Planning Coordination Committee (PCC). 3.4. R3 applies to internal WECC Member Systems as well as between Member Systems.

4. TPL-001-4, R5 and R6 • R5 - TP and PC must have criteria for acceptable: • System steady state voltage limits • Post-Contingency voltage deviations • Transient voltage response • R6 - TP and PC must define and document the criteria or methodology used in the analysis to identify System instability for: • Cascading • Voltage instability • Uncontrolled islanding

5. TPL-001-4, R5 and R6 options • Retire WR3 without any replacement action • Each entity identify and document their own system performance requirements • A regional variance to NERC TPL-001-4 identifying acceptable System Performance • For each entities system • For other systems • Criterion • Guideline

6. TPL-001-4, R5 and R6 options • Do we want to limit impacts on other Systems • Used to be covered by TPL-001-WECC-CRT-2.1, WR1 • RS recommended, and Ballot Pool approved, deletion of WR1 upon approval of the new TPL-001-4 • Some WSC members and Planners in the West have questioned whether or not we want to retain this as a regional variance

7. Variance, Criteria, or Guideline • Regional Variance • Develop using the WECC Standards Development Process • Would be mandatory and enforceable • Difficult to include exceptions • Consider for impacts on others only

8. Variance, Criteria, or Guideline • Criteria • Develop using WECC Standards Process • Ensures consistency across the Region • Not mandatorily enforceable • Could be expected that WECC Members would adhere

9. Variance, Criteria, or Guideline • Guideline • Developed by RS using existing requirements from TPL-001-WECC-CRT-2.1 as a starting point • Could use WECC Standards Process for open and transparent communications • Would be approved by PCC • Entities could adopt Guidelines as their performanc thresholds • would still ensure consistency across the Region • Not mandatory unless adopted by applicable entities • Would allow each entity to develop their own acceptable performance thresholds • Could include exceptions

10. Questions?