PNNL-22010 Rev. 2 / SAND2016-3078 R

The Protocol for Uniformly Measuring and Expressing the Performance of Energy Storage Systems
(PNNL-22010) was first issued in November 2012 as a first step toward providing a foundational basis
for developing an initial standard for the uniform measurement and expression of energy storage system
(ESS) performance. Based on experiences with the application and use of that document, and to include
additional ESS applications and associated duty cycles, test procedures and performance metrics, a first
revision of the November 2012 Protocol was issued in June 2014 (PNNL-22010 Rev. 1). As an update of
the 2014 revision 1 to the Protocol, this document (the April 2016 revision 2 to the Protocol) is intended
to supersede the June 2014 revision 1 to the Protocol and provide a more user-friendly yet more robust
and comprehensive basis for measuring and expressing ESS performance. This foreword1 provides
general and specific details about what additions, revisions, and enhancements have been made to the
June 2014 Protocol and the rationale for them in arriving at this April 2016 Protocol (PNNL-22010 Rev.
2 / SAND2016-3078 R).em in arriving at the June 2014 Protocol.