The speakers in this panel discussion guide us through how rotating, linear, permanent magnet and non-permanent magnet machines have been matched to wind, wave, hydro and tidal renewable energy applications. Whilst full scale renewable schemes frequently involve MW-rated machines, smaller generators can play their part too, either as technology demonstrators or as installations in their own right. The panel considers machines from 100 kW to MW, as well as how technology from one application area can be brought to bear in the renewable field.