the stability of the power system at all points in time on a millisecond level. much of the country's power will come from wind, hydro and solar, but that's also where its experiment with tidal energy comes in. it's predictable. we know exactly when it's there, 100 years ahead. if we install tidal turbines in different spots, we will have a baseload generation from tides, and that is extremely valuable. if we can unlock the potential, it can really dramatically change the energy mix in the islands. maybe 30 to 40% of the annual usage in the islands could be provided by tides. now this dragon has begun to fly, and it's sending energy to the grid. it's just one machine, but potentially a big leap forward for harnessing energy from our seas. this is the richard cloudesley school in london...