SGIP to investigate electric vehicle fueling submetering requirements


Wakefield, MA, U.S.A. — (METERING.COM) — August 26, 2013 – A new Priority Action Plan (22) on standards for electric vehicle (EV) fueling submetering has been approved by the SGIP Board of Directors

The impetus for EV fueling submetering is driven by the need to provide utilities, energy retailers, and other energy service providers the ability to identify, measure, and manage EV charging loads. Also of importance is the capability to provide real time EV charging electricity usage and cost information to the customers in a cost effective, and easy to understand manner.

Presently, separate measurement and billing of electricity for EV charging requires customers to pay for the installation of a parallel utility approved electrical meter at their residence. Installation can be expensive and requires a separate utility customer account and invoice just for EV charging. Submeters offer a viable, alternative, cost effective and convenient approach, enabling separation of EV charging kWh usage and time of use applied pricing on a single customer account.

There are several segmented activities being investigated to address regulatory and standards needs for the development and deployment of EV fueling submetering. The California Public Utilities Commission has initiated an EV Submeter Protocol proceeding and has determined the submeter can conceivably be a smart electrical measurement device attached to the circuit; embedded in the EV supply equipment (EVSE) transferring electrical power to the EV from the grid; an integrated device in the EV charging inlet circuit; or embedded in a portable smart plug adapter. The National Electrical Manufacturers Association (NEMA) has established a specific task force, consisting of EVSE manufacturing representatives, to determine the requirements for EVSE embedded submetering. Currently there are neither defined requirements nor specific standards for these methods of submetering.

“The purpose of the PAP is to bring the disparate activities and initiatives together to work toward a set of national standards that especially encompasses the requirements for a utility billing grade EV submeter solution,” explained PAP 22 chair Krishnan Gowry from Pacific Northwest National Lab.

The members of the PAP are a collaborative team of regulatory and standards experts consisting of representatives from NEMA, ANSI, NIST, utility commissions, EVSE manufacturers, meter manufacturers, utilities, and system integrators. The team is to determine the requirements for submetering, and evaluate existing meter standards and regulatory specifications to determine the submeter elements needing standards development.

Submetering requirements are to address measurement accuracy, accessibility, certification, data formatting, communications, etc. needed to ensure national consistency and compatibility in the development and deployment of EV fueling submeters.