Dynamics models 1 Electric power transmission networks 1 Flexible fuel cell 1 Fuel-cell power plants 1 Grasshopper project 1 MW-scale PEM FC 1 MW-scale PEM fuel cell 1 PEM fuel cell 1 Partial load 1 Pilot plants 1 Power grids 1 Proton exchange membrane fuel cells (PEMFC) 1 Renewable energy resources 1 Scale-up 1 Temperature 1 Warm up 1 flexible FC 1 partial load 1 scale-up 1 warm-up