MWh

.. appreciate your are trying to get a sense of scale, but it’s important to note that short-duration batteries are not there as a generator to serve load, they are good for providing peak demand support to the system and the local LV distribution network, and to help regulate frequency.

I’m not familiar with the US market environment, but in Australia where we have a number of VPP operators, including Tesla, it the latter service that is the most used.

Frequency regulation services are associated with absorbing and injecting energy into the power grid over milliseconds.