ADS and WPR Seed Case Background Nick Hatton Associate Engineer II Western Electricity Coordinating Council

ADS Background: Purpose & Products Common Starting Point – Consistent initial data from the RPGs that helps WECC populate their Base Case Reflects key planning assumptions of: Resource and transmission topology RPS compliance Other public policy considerations Key Products: 2028 HS PF; 2028 ADS PCM, Change files and roundtrip-validated 1-hour exports. The Board of Directors approved the development of the Anchor Data Set (ADS) concurrently as the Reliability Assessment Committee (RAC). The ADS is a compilation of ten-years of load, resource and transmission topology information used by the Western Planning Regions (WPR) and International Planning Regions (IPR) in their regional transmission plans as well as by other stakeholders in various planning analyses. Data included in the ADS would be compatible with Production Cost Models (PCM) and Power Flow Models (PFM),1 including dynamic data and associated assumptions. The data would reflect applicable provincial, state and federal public policy requirements. The primary goals of the ADS development are: 1. Reduced duplication. A single submission of a solved power flow and PCM would reduce the current iterations between various power flow and PCM cases. 2. Increased collaboration between WECC and Regional Planning Groups. The ADS validation process would establish a single forum for resolving questions about data included in Regional Transmission Plans. 3. Establishment of a single repository for data used in reliability assessments. The ADS would contain reliability assessment data in a single repository instead of multiple locations within WECC, Western Planning Regions and International Planning Regions. 4. Increased synchronization between Year-10 and Year-20 reliability assessments. The ADS process would increase review and validation of assumptions used in reliability assessment data during preparation of the ADS.

Operational ADS Workflow (1.0) Quick overview of ADS process here Western Electricity Coordinating Council

Base Case Data and the ADS Workflow Discussion on how base case will be built, and where various parties get to have input Western Electricity Coordinating Council

WPR Seed Case Expectations WPR seed case exists as a reference Typical Case build Coordination points Review what the WPR seed case is, and what it should include. Cover what our beliefs are as to what people will do with this information Cover how the WPR data and the typical data submitter’s data will make it into the base case Cover where the WPR and the data submitters will have a chance to coordinate Western Electricity Coordinating Council

Western Electricity Coordinating Council Timeline 8/4/17 – Data Request mailed out Use the WPR seed case to inform what data is included in the data being provided Coordinate any significant deviations from the seed case with the planning regions 9/29/17 – Initial Data Due to WECC 10/27/17 – WECC staff send case for review Key time to coordinate changes with the planning regions 11/17/17 – Data submitter comments due to WECC Staff 12/01/17 – WECC staff finalize the case Western Electricity Coordinating Council

Western Electricity Coordinating Council Data Quality Request Correct Non-Conforming Flags Interface Definitions Turbine Types All Seasonal branch ratings Generators as negative loads – please follow DPM (any single unit above 10 MVA, or aggregation above 20 MVA modeled as generator) Station Service loads should have an ID of “SS” Each bus should have its Balancing Authority labeled Western Electricity Coordinating Council

WPR expanded data request Western Electricity Coordinating Council

Western Electricity Coordinating Council Questions? Please contact me: Nick Hatton nhatton@wecc.biz (801) 883-6855 Western Electricity Coordinating Council