Assessment of sector-coupling technologies in combination with battery energy storage systems for frequency containment reserve

•Technology-independent analysis of sector-coupling technologies with BESS to provide FCR.•Different sector-coupling technologies are represented by investment and variable cost.•For all hybrid system a BESS capacity of 350 kWh to provide FCR with perfect foresight is sufficient.•Supplementing of existing plants with BESS for FCR by lowering its power is economically viable.•Build of new hybrid systems for exclusively FCR performance is highly cost-dependant.