The problem of all kinds of renewable energy sources is that you cannot really calculate how much sun, wind or rain you will have each day, in order to determine if the energy produced will be enough. But this problem is solved by one energy source: tides. Tides are capable of producing enough energy to cater the UK’s electricity consumption. Their quantity is completely predictable, as it is a result of the moon’s stable gravitational pull.
Now, a new way to take advantage of this energy has been developed: floating turbines are a solution to the problem of how this energy will be taken advantage of. Up until now, the effort to use tidal power had focused on developing turbines that are placed on the seabed, heavy and expensive. The new innovation, floating turbines, are cheaper, easier to use, easier to maintain. There’s no specific model that has been developed perfectly, as this is new technology, but many studies have come pretty close. Here is a video of a study like that, which could enlighten you on how they would work.