scope:

Types of Systems to Which This Code May Apply

This Code applies to ESSs in which mechanical or thermal means are used to affect the storage and release of energy from suitable mechanical, thermal, or fluid media.

This Code applies to the measurement of the performance of an ESS at the specified conditions, with all equipment associated with the system functioning in accordance with those conditions.

An ESS may use any of various media, including, but not limited to, the following:

(a) thermal energy storage media, such as phase-change media (e.g., liquefied air or water-ice) or sensible heating media (e.g., molten salt or thermal fluids and oils)

(b) compression media, such as compressed air or springs

(c) gravitational media, such as pumped hydromechanical energy or railcars on inclines

(d) chemical media, such as hydrogen or ammonia reactions

(e) kinetic media, such as flywheels

This Code provides methods to measure energy and material flows to and from an ESS that are relevant to assessment of ESS performance. For example, some ESSs may use energy inputs from multiple external sources. Some ESSs may also produce by-products such as water, carbon dioxide, or industrial gases that may have economic value or disposal costs of interest to users of this Code.

Types of Systems to Which This Code Does Not Apply

Cellular electrical battery storage devices (lead-acid, lithium ion, etc.) are specifically excluded from this Code. Test codes promulgated by other professional organizations have defined test procedures for that technology.