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

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

3. State of Energy Storage in US

4. State of Energy Storage in US

5. State of Energy Storage in US

6. State of Energy Storage in US

7. State of Energy Storage in US

8. State of Energy Storage in US

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

10. 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.

11. 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

12. 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.

13. 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.

14. 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

15. 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

16. 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

17. Thank you. Chart references: https://www. greentechmedia
Thank you. Chart references: