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 2.3 rd Party/Customer Owned Revenue Submeter 3.Non-Utility Revenue Submeter 4.Real Time Dispatchable Load Submeter

Use Case 1: Utility Owned Revenue Submeter 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. Electric Panel Primary Electric Meter Electric Panel Electric Submeter EVSE PEV Power Communications Utility

Electric Panel Primary Electric Meter Electric Panel External Submeter EVSE PEV Power Communications Use Case 2: 3 rd Party/Customer Owned Revenue Submeter 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 Embedded SoC Internal Submeter Daughter Card or Module Utility Data Management Agent

Use Case 3: Non-Utility Revenue Submeter 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 Electric Panel Primary Electric Meter Electric Panel External Submeter EVSE PEV Power Communications Embedded SoC Internal Submeter Daughter Card or Module Primary Account Owner or EMS Data Management Agent

Use Case 4: Real-time Telemetry for Dispatchable Loads 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% Electric Panel Primary Electric Meter Electric Panel External Submeter EVSE PEV Power Communications Embedded SoC Internal Submeter Daughter Card or Module Utility/ISO Aggregator/EVSP

Use Case Requirements Structure and Dependencies PEV Refueling Submeter Requirements ANSI NIST NCWM PUC NEMA

Assumptions/Questions Use Case 1: Utility Owned 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? Use Case 2: 3 rd 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 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 3 rd 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?