Waves can occur because of the wind blowing over the sea surface. As long as the wave is moving forward at a slower rate than the wind speed, energy will travel through the wind to the wave.
There are clever and complex equations that are formed that can accurately determine the amount of energy in a wave wave. To make it easier, the bigger the wave, the more power it has and there are some places on earth where the waves are high, like the waves of Nazare, Portugal.
These giant waves in Portugal can reach epic proportions, over 27.5m thanks to the combination of the beach location and unique underwater features. The waves created by storms in the North Atlantic focus on an arrow-shaped valley 4,777m below sea level: these deep water waves then approach the shallow waters of the coast and begin to roll up, meaning the waves at Nazare can be large.