“With no large-scale batteries participating in the wholesale market in New York, the first day we turned the battery on it was exciting to see if all our internal models were correct in how the battery would behave,” KCE’s COO Dan Fitzgerald told us.

Vattenfall has brought online its 22MW battery project co-located with the Pen y Cymoedd onshore wind farm in Wales, becoming the latest company to start delivering sub-second frequency response to National Grid in the UK.