Final answer:
The student's question refers to the potential of tidal streams providing a reliable source of tidal energy, a type of renewable energy generated by the gravitational pull of the moon and sun on the Earth's oceans.
Step-by-step explanation:
The predictably regular tidal streams have the potential to provide a reliable new source of tidal energy. Tidal power harnesses the energy from the gravitational pull of the moon and sun on the earth's oceans, combined with the earth's rotation, to generate electricity. This process typically involves the installation of turbines in locations with significant tidal movements, like large inlets or estuaries. The blades of these turbines are turned by the flowing water, similarly to how hydroelectric power is generated from dammed rivers. Tidal power is considered a renewable energy source as it relies on gravitational forces that are continuously present due to the celestial mechanics of the earth, moon, and sun.
Regarding the potential of tidal power, it is important to note that this form of energy is very location-dependent and has its environmental costs. Nonetheless, it is a physically viable source that contributes to the energy mix and has seen development in places like La Rance, France. While tidal power is not likely to become the dominant form of energy generation globally, it is a part of a diverse set of renewable energy options that can help reduce our reliance on non-renewable and environmentally harmful fossil fuels.