What is the minimum duration that FCR should be delivered, i.e. what is the endurance requirement?

For resources with Limited Energy Reservoir (LER):

For FCR-N, the endurance requirement is 1 hour of full activation in the upward direction and 1 hour of full activation in the downward direction. To deliver 1 MW of FCR-N, an energy storage capacity of at least 2 MWh is required, starting the delivery period at 50% state of charge.
For FCR-D up, the endurance requirement is 20 minutes of full activation in the upward direction, and for FCR-D down, the requirement is 20 minutes of full activation in the downward direction.

For resources without Limited Energy Reservoir:

FCR-N and FCR-D must be deliverable for as long as the frequency deviation persists, or throughout the entire hour they are activated.

Reviewed 18 August