When do tidal power stations generate electricity?

• A. During full moon
• B. When the high tide is coming in or the low tide is going back
• C. Only during high tide
• D. Only during low tide

Answer: (B)

Tidal power generates electricity from the movement of seawater caused by tides. The turbines turn when water is actively flowing through them, which happens during the flood when the water level is rising and moving in, and during the ebb when the water is falling and moving out. Generation is strongest during these moving phases and can be minimal at slack tide, when water movement slows. So the best description is that electricity is produced when the high tide is coming in or the low tide is going back.