PAP22 EV Refueling Submetering Use Cases 5 November 2013 SGIP Inaugural Conference Palm Beach, Florida V2G DEWG F2F Session George Bellino EV Submetering Use Cases Four Use Cases Identified 1. Utility Owned Revenue Submeter 2. 3rd Party/Customer Owned Revenue Submeter 3. Non-Utility Revenue Submeter 4. Real Time Dispatchable Load Submeter Use Case 1: Utility Owned Revenue Submeter Electric Panel Utility Electric Submeter Primary Electric Meter EVSE PEV Power Communications • Purpose: separate measurement of PEV refueling kWh consumption for utility billing based on specific EV rate tariff • Requirements: Utility Jurisdiction - Accuracy, Access, Certification, Test , etc. specifications per utility regulations • Applied Standards: ANSI C12.1, C12.20, etc. Use Case 2: 3rd Party/Customer Owned Revenue Submeter Electric Panel Utility External Submeter Primary Electric Meter Embedded SoC Power Data Management Agent EVSE PEV Internal Submeter Daughter Card or Module Communications • Purpose: separate measurement of PEV refueling kWh consumption for utility billing based on specific EV rate tariff • Requirements: Jurisdiction is State Weights & Measures agencies • External Submeter can be same as Utility Owned Revenue Submeter • Other configuration as determined by ANSI C12 Sub Committee • NEMA determining EVSE Embedded Submeter requirements • Apply to Internal Submeter and Daughter Card/Module options Use Case 3: Non-Utility Revenue Submeter Primary Account Owner or EMS Electric Panel Primary Electric Meter Embedded SoC Power Data Management Agent External Submeter EVSE PEV Internal Submeter Daughter Card or Module Communications • Purpose: separate measurement of PEV refueling kWh consumption for allocated billing by landlord to tenants or information for facility energy management – not for utility billing • Requirements: Jurisdiction is State Weights & Measures agencies • External Submeter same as Utility Owned Submeter; • Other configuration as determined by ANSI C12 Sub Committee • NEMA determining EVSE Embedded and Internal/Module Submeter requirements Use Case 4: Real-time Telemetry for Dispatchable Loads Electric Panel Utility/ISO Primary Electric Meter External Submeter EVSE Embedded SoC Power PEV Internal Submeter Daughter Card or Module Aggregator/EVSP Communications • Purpose: provide the operational state - i.e. amount of power consumed or produced by the PEV in real-time for bi-directional power flow • Requirements: • Measure instantaneous power - both real and apparent • Measure charge/discharge energy capacity • Frequency data measured – 2 seconds to 5 minutes • Frequency data reported – 2 seconds to 15 minutes • Power measurement accuracy: 2% - 5% Use Case Requirements Structure and Dependencies PEV Refueling Submeter Requirements NIST PUC NCWM ANSI NEMA Assumptions/Questions • Use Case 1: Utility Owned Revenue Submeter • • • • Use Case 2: 3rd Party/Customer Owned Revenue Submeter • • • • • • EVSE to be tested as a submeter device - Requirements apply to all embedded and internal daughter board/module configurations External submeter – comply with NEMA requirements or same Utility owned Submeter? Assume not addressing Level 1 submetering nor portable submetering? Communication protocols to be specified by utility industry? Harmonization with NCWM HB44 requirements? Use Case 3: Non-Utility Revenue Submeter • • • Assumes existing Utility meter regulations apply Will Utilities own EVSE as a submeter device and affect EVSE embedded/internal submeter requirements? Per HB 33 all EVSEs shall have submeter function – conflict with Utility fixed submeter? Assumes requirements same as Use Case 2 Is there differentiation in Accuracy, Calibration, Access, etc. requirements between Utility Revenue Submeter and Non-Utility Revenue Submeter? Use Case 4: Real Time Telemetry for Dispatchable Loads • • Will requirements for Use Case 2 and 3 support this Use Case? Is there variability in functional requirements that need be addressed? Questions • Do all state PUCs maintain jurisdiction over utility revenue meters? – How do municipal utilities (not under CPUC jurisdiction such as SMUD and LADWP) regulate their revenue meters? • Do other states allow use of submeters for utility billing? • Will other state PUCs adopt 3rd Party revenue submeter ownership? • Is it assumed there will be variability in performance and functionality requirements between embedded, portable, and fixed submeters? • Is there intent to submeter 120V/1.5kW charging? Portable EVSE cords, plug outlet adapters, etc.? • Is there differentiation in performance and functionality between submeters for C&I environment versus Residential environment?