Aim of the OPTIM-CAP demo is to optimize the usage of the available transfer capacities for reserve procurement and for energy trading, building on top of the current auction algorithms, thus assuring the system security and the more effective allocation of the grid capacity. Preliminary design for the co-optimized market was developed, with detailed functionality, energy-reserve market timeline, gate closure synchronization. The gap between the current transmission right allocation methods based on energy schedules (order collection, clearing, allocation, settlement) and the procurement of frequency ancillary services (order collection, dispatch, procurement, awarded capacities) was identified. Energy producers and market operators have elaborated potential solutions to link energy and capacity bids on the market.