This project investigates the effects of extreme conditions on marine energy generators when installed as a single device or in arrays or farms. By combining the results of experiments, computer predictions and real life expertise, the research will enable the industry to produce, design and manufacture better tidal stream turbines that can be optimised to suit the prevailing sea conditions. Once these devices are deployed there will be a need to remotely monitor their condition and manage their operation during their life time. This research will deliver a system that will allow the owners of the devices to remotely monitor their condition and performance to ensure they achieve optimal energy production whilst maximising their life span. This will enable the electricity suppliers using this source of renewable energy to achieve the best possible long term economic performance. Finally, the environmental impact of such installations will be considered to ensure the positioning of these devices is not detrimental to the surrounding sea, coast and seabed.