Marine Renewable Energies are increasingly seen as key to help develop a sustainable blue economy and sectors such as marine aquaculture, offshore energy, defence and commercial shipping. Reliable in-situ power generation could allow marine aquaculture to move farther away from the coast, reducing environmental impacts. Underwater or offshore charging stations could extend the range and duration of unmanned underwater vehicle missions , reducing the need for expensive fuel-burning support vessels. Powered buoys that generate energy using underwater turbines or integrated wave energy conversion systems could support longer deployments and host larger payloads with more sensors, collect more data, and increase the frequency of communications back to shore.