What could the temperature difference be?

Thermal energy refers to the thermal energy of the water temperature difference between surface seawater and deep seawater.

Since the sea areas rich in thermal energy resources of the oceans are very remote and, according to the laws of thermodynamics, the efficiency of the technology of extracting thermal energy from the oceans is very small, the amount of available energy is therefore very small. But despite this, the potential for ocean thermal energy remains considerable.