Distribution Services Attributes and Performance and Measurement Requirements

Distribution Services, Attributes and Performance and Measurement Requirements Subteam 1 a Competitive Solicitations Framework Working Group Meeting Integrated Distributed Energy Resources Proceeding Mark Esguerra and Diana Genasci July 28, 2016 READ AND DELETE Mark Esguerra For best results with this template, use Power. Point 2003

Definitions of Basic Distribution Services Distribution Service Distribution Capacity Voltage Support (Voltage control through real and/or reactive power) Reliability (Back-Tie) Resiliency (Microgrid) Definition Load modifying or supply services that DERs provide via dispatch of power output (MW) or reduction in load that is capable of reliably and consistently reducing net loading on desired distribution infrastructure. Improved steady-state voltage to avoid voltage related investment. Dynamic voltage management to keep secondary and primary voltage within Rule 2 limits. Load modifying or supply service capable of improving local distribution reliability and/or resiliency. Service provides fast reconnection and availability of excess reserves to reduce demand when restoring customers during abnormal configurations. Service also provides power to islanded end use customers when central power is not supplied and reduce duration of outages. 2

Distribution Service Attributes • Locational Specificity of Distribution Services • Level or Magnitude of Required DER Response • Timing and Duration of DER Response • DER Availability and Assurances 3

Performance Requirements • System Availability • Data Availability • Response Time • Quality of Response 4

APPENDIX READ AND DELETE For best results with this template, use Power. Point 2003

Integrated Distribution Planning Framework Distribution Resources Plan (DRP) 1 Assumptions, Scenarios & Scope Develop forecasts, assumptions and planning scenarios. • Demand forecasts • DER Growth Scenarios 2 3 Distribution Planning Assessment Distribution Grid Needs Distribution Grid Studies • Distribution Capacity • Voltage Support Requirements • Protection • Safety and Reliability Distribution Grid Needs • Load Serving Capacity • DER Hosting Capacity • DER Aggregator Requirements • Coordination with Transmission Planning Integrated Distributed Energy Resources (IDER) 4 5 Evaluate Options Prioritize Grid Needs Investment framework/technical feasibility Sourcing Process to satisfy needs identified in DRP Implement “Wires” alternatives for locations deemed infeasible for DERs Implement “Wires” Solution 6

3 Distribution Grid Needs Hypothetical examples of Distribution Service Attributes 1 Assumptions, Scenarios & Scope 2 3 4 5 Distribution Planning Assessment Distribution Grid Needs Evaluate Options Distribution Portfolio 7

Distribution Capacity: Substation Transformer Overload Distribution Grid Need • An 11. 88 MW rated substation transformer is forecasted to overload in the summer months. • Substation transformer capacity deficiency is determined to be: ‒ 1. 4 MW by 2019 ‒ 2. 6 MW by 2020 ‒ 3. 6 MW by 2021 • Traditional “wires” solution is to replace existing or install an additional transformer, after exhausting available capacity through field switching onto adjacent distribution feeders. 8

Distribution Capacity: Substation Transformer Overload Potential DER Solution for Overload Need: • Attributes of DER performance must match overload issue attributes to provide relief of capacity constraint • Other attributes of DERs must address grid issues stemming from DERs providing relief of capacity constraint (e. g. ramp rate) DER Attributes to Procure YEAR 2017 2018 2019 2020 2021 Distribution Capacity Need (MW) - - 1. 4 2. 6 3. 6 Distribution Capacity Need (MVAr) - - - Months when needed - - Aug-Sept July-Sept Days when needed - - Mon-Fr Time when needed - - 16: 00 -19: 00 15: 00 -20: 00 14: 30 -20: 30 Duration (hours/day) - - 3 5 6 1 3 5 Frequency of Need (days/month) 9

Voltage Support Services: Steady State Under Voltage Forecast Under Voltage Issue: • A pump station customer is planning to convert two pumps from diesel to electric by 2020 Rule 2 Limit • The pumps will add an extra 1 MW to peak load condition. Customer is located close to the end of a radial feeder • Projected under voltage conditions near the end of the feeder is found to occur around forecasted peak loading times M Rule 2 Limit 10

Voltage Support Services: Steady State Under Voltage Potential DER Solution for Overload Need: • Attributes of DERs should match under voltage issue attributes to stay within Rule 2 voltage thresholds (± 5% of nominal voltage) • Attributes of under voltage issue ‒ Needed voltage changes (ΔV) to stay within Rule 2 limits ‒ Locations where under voltage occur ‒ Times and duration when under voltages occur • Other attributes of DERs must address grid issues stemming from DERs providing voltage support (e. g. ramp rate) DER Attributes to Procure Distribution Capacity Need (k. W) Distribution Capacity Need (k. VAR) Duration (hours/day) Frequency of need (days/month) Time Needed Days Needed Months Needed Electrical Proximity from Voltage Issue 2017 2018 2019 - - - - - YEAR 2020 50 at lagging PF 3 8 17: 00 -20: 00 Mon-Fr June-July 0. 5 Circuit Miles of SPID 77943 XXXXX 2021 550 60 at lagging PF 3 8 17: 00 -20: 00 Mon-Fr May-July 0. 5 Circuit Miles of SPID 77943 XXXXX 11

Voltage Support Services: Steady State Under Voltage Location Matters: G M • Almost Identical Voltage Profile when Compared to no DER Scenario • Voltage is Back within Rule 2 Limits Rule 2 Limit GM Rule 2 Limit 12