Unlike wave power, these devices would be as many as 30 meters below the surface, safe from storms, seagulls, what have you. While being way down there may pose a unique set of challenges, the company claims TidEl can be remotely triggered to rise to the surface for routine maintenance. Technologies like TidEl may be a welcome alternative to wind farms that take up large areas on land or at sea, and also may satisfy those who find wind farms unsightly. Underwater energy farms may also offer an alternative to massive hydroelectric dams that prove so ecologically and socially disruptive. As of yet, nothing has been said of the potential impacts on aquatic ecosystems from tidal stream turbines (although let your imagination run for a second and you might be on to something). Proposed turbine farms would range from 30 to 100 units, providing a max. output of 100 megawatts per farm. Energy would be transmitted to land along underwater cable. The underwater vehicles that lay this cable (again, let your imagination run) are also available from SMD Hydrovision.
Lastly, since the motion of the ocean is largely a result of the gravitational force of the moon as it literally bulges the sea from one side of the earth to the other, couldn’t we say this is lunar energy ? Solar is so clearly over.