A fun and simple guide to wave energy for kids. Learn how ocean waves can make electricity with easy explanations and hands-on activities.
Hi kids. Have you ever been to the beach and seen the waves rolling in? Those waves have energy. We can use that energy to make electricity. Here is the short version:
Wave energy is power from ocean waves. It is a type of renewable energy. Renewable means we will never run out of it. The wind will keep blowing. The waves will keep rolling.
Here is how it works. The sun heats the air. Warm air rises. Cool air moves in. That moving air is wind. The wind blows across the ocean and makes waves. So wave energy is really stored sun and wind energy.
We use machines called wave energy converters to catch the wave power. Some machines bob up and down like a cork. Some flex like a snake. Some use air to spin a fan. They all turn wave motion into electricity.
You can make waves at home. It is easy.
What you need: A bowl or baking dish, water, and a drinking straw.
What to do: Fill the bowl with water. Use the straw to gently blow across the water surface. Watch what happens.
You will see small ripples. Those are waves. You just made wave energy. Your breath was the wind. The ripples are the waves. Real ocean waves work the same way. They just use much more wind.
Now put a tiny piece of cork or foam in the water. Blow across the surface again. Watch the cork bob up and down. It moves but does not travel with the wave. That is how wave energy works. The wave carries energy, not water.
There are different kinds of wave machines. Here are three main types.
The bobber. This is a floating buoy. It goes up and down with the waves. Inside, a generator turns that up-and-down motion into electricity. It is like a float on a fishing line.
The snake. This is a long machine that floats on the water. It has sections connected by hinges. When a wave passes, the sections bend at the hinges. That bending makes electricity.
The air blower. This machine has a hollow chamber. Part of it is underwater. Waves push water into the chamber. The water pushes air out through a small opening. The moving air spins a fan-like turbine. When the wave goes back, air gets sucked in and spins the turbine again.
All these machines do the same thing. They catch wave energy and turn it into power we can use.
Wave energy has some really cool features.
It never stops. Waves move all day and all night. Solar panels stop at sunset. Wind turbines stop when the air is calm. But waves keep going.
It is strong. Water is heavy. It is 850 times heavier than air. That means a wave can carry a lot of power. A wave machine can make a lot of electricity from just a small space.
It is clean. Wave machines do not burn anything. They do not make smoke. They do not make pollution. They just use the natural movement of the ocean.
It is predictable. Scientists can forecast waves days in advance. We know when big waves are coming and how much power they will bring.
Wave energy is cool, but it also has challenges.
The ocean is tough. Waves can be very powerful. Storms can damage machines. Saltwater causes rust. Machines need to be very strong, which costs money.
It costs a lot. Wave energy is more expensive than wind or solar power right now. But the price is coming down as engineers learn how to build better machines.
Ocean animals. The machines sit in the ocean. Fish and whales live there. Scientists study how the machines affect sea life. New designs try to be animal-friendly.
People are testing wave energy in many places.
Portugal had the first wave farm in 2008. Three snake-like machines made electricity for nearby homes.
Scotland has a test center where companies try out new wave machines. Over 30 different machines have been tested there.
Australia has a machine that sits underwater. You cannot see it from the surface. It pumps water to shore to make electricity.
United States has a test site in Oregon. Companies can connect their machines to the power grid and test them in the Pacific Ocean.
Experiment 1: Wave power. Fill a basin with water. Use a ruler to make waves. Hold a pinwheel in the water. The waves will spin the pinwheel. That is how wave turbines work.
Experiment 2: Making a model OWC. Cut the bottom off a plastic bottle. Hold it upside down in a bowl of water. Push it down and watch air bubbles come out. Pull it up and watch water go in. That air movement is what spins a turbine in an oscillating water column.
Experiment 3: Float test. Put different objects in water. A cork, a marble, a plastic toy. See which ones float and bob with waves. The best bobbing objects work like point absorber wave devices.
Last updated: June 15, 2026
What makes ocean waves?
What does a wave energy machine do?
How many times heavier is seawater than air?
Where does the energy in waves come from first?
What do we call a machine that captures wave energy?
Answers: B: Wind, B: It turns wave motion into electricity, C: 850 times, B: The sun, B: A wave energy converter
What is wave energy for kids?
Wave energy is electricity made from ocean waves. Wind blows across the sea and makes waves. Special machines catch the wave motion and turn it into power we can use in our homes and schools.
How do waves get their energy?
The sun heats the air and makes wind. Wind blows across the ocean and pushes the water. That makes waves. So wave energy really starts with the sun. The energy travels from the sun to the wind to the waves.
Can kids understand how wave power works?
Yes. Wave energy is simple to understand. Waves move up and down. A machine catches that motion. The motion spins a generator. The generator makes electricity. You can even try it with a bowl of water and a pinwheel.
Is wave energy safe for the environment?
Wave energy does not make any smoke or pollution when it makes electricity. But the machines in the ocean can affect fish and other sea animals. Scientists are studying how to make wave energy as safe as possible for ocean life.
Why do we not use wave energy everywhere?
Wave energy machines are expensive to build. The ocean is a tough place. Waves can break things. Saltwater causes rust. Engineers are working on making wave energy cheaper and stronger so we can use it more.
