Energy Storage Systems (ESS) Overview Steve Griffith February 28th, 2017

Agenda State of Energy Storage in the US Market Energy Storage Applications NEMA’s Energy Storage Systems Group: Scope Member companies Vision/Overarching Principles

State of Energy Storage in US

State of Energy Storage in US

State of Energy Storage in US

State of Energy Storage in US

State of Energy Storage in US

State of Energy Storage in US

Application Examples Frequency regulation Bulk wind balancing Distributed grid connected renewables integration Electric vehicle support

Frequency Regulation Generation assets must be synchronized to electrical grid operation, which requires AC frequency to be held within tight tolerance bounds. Different methods available for “frequency regulation” include generator inertia, adding and subtracting generation assets, dedicated demand response and electricity storage. Electricity storage has the capability to provide frequency regulation in milliseconds.

Bulk Wind Balancing Integration of wind generation into the electric grid poses challenges. A significant portion of wind generation occurs at night, when the value is low. ESS can help to store electricity generated at night and dispatch it during the day when it is most needed

Distributed grid connected renewables integration Distributed renewables, like Photovoltaics (PV), pose challenges to grid engineers, planners and operators. Rapid output variations Daily variability of the output Effects on power quality Current “backflow” Mismatch between PV output and end-users’ peak demand Grid-connected or on-site electricity storage located near or on-site where PV is deployed provides means to offset or manage those challenges.

Electric Vehicle Support Plug-in electric vehicles could occur at night and during weekends, when electricity value and price are low or relatively low and while passenger vehicles are not needed/used.  Some EV charging will be needed during the day and even during peak demand periods Without sufficient capacity to accommodate the extra power needs, the utility has several options: Build out generation, transmission and distribution infrastructure to add needed capacity Install distributed generation and storage.

NEMA’s Energy Storage Systems Group Scope (Excerpt) Includes Storage device/medium Power conversion systems Control & management systems Up to point of common coupling with a grid or premise Must be stationary Can be grid connected or operate independent of the grid Can be on the operator (utility) side or consumer side of the electric power system

NEMA’s Energy Storage Systems Group Member companies ABB, Delta Products Corporation, East Penn Manufacturing, Eaton, GE, Panasonic, S&C Electric, Schneider, Siemens, TESLA, and Toshiba

NEMA’s Energy Storage Systems Group Vision/Overarching Principles Common approaches to standardization and code development Promoting government policies that encourage technological innovation and the markets for them Common understanding of business cases through economic analyses and education Facilitating the integration of energy storage products into electric power system markets to the benefit of all stakeholders

Thank you. Chart references: https://www. greentechmedia Thank you. Chart references: https://www.greentechmedia.com/articles/read/The-State-of-US-Energy-Storage-in-7-Slides Steve.Griffith @nema.org