Is there any limitation on how much an ancillary service bid can increase in size once the minimum bid volume requirement has been met?

A bid may increase in steps of at least, and in multiples of:

For FCR: 0.1 MW. The volume of FCR that may be provided per unit is limited to a maximum of 5 percent of the FCR requirement in the Nordic synchronous area.

For aFRR: 1 MW.

For mFRR: 1 MW. No maximum bid size applies.