You are clearly in wrong here. There's a reliable energy system run entirely on sunlight, that is basically identical to the proposed deep ocean currents in the

You are clearly in wrong here. There's a reliable energy system run entirely on sunlight, that is basically identical to the proposed deep ocean currents in the principle: hydropower. In short: the storage is built-in - it is in the potential energy of that small percentage of the water in the oceans, which is still large enough to be absolutely immense.