Energy from tides by using the concept of gravitational force as gravitational force of moon gives rise to tides in the sea. The tides raise the water in sea roughly twice a day. If the water at high tide is trapped in basin by constructing a dam , then it is possible to use it as a source of energy. The dam is filled at high tide is trapped and water is released in a controlled way at low tide to drive the turbines. Hence electricity can be produced.