Wind power

Moving air can make power.

This air turns big fans. These fans make electricity.

People put many fans in one place. This is called a wind farm. Some farms are on land. Other farms are in the sea. Wind is a clean way to get power. It can help our world stay healthy. Wind power is a great way to make energy.

Wind is air that moves through our world.

People use this moving air to make electricity. This is called wind power. Most wind power comes from wind turbines. These are tall machines with large blades.

A group of these turbines in one place is a wind farm. Some wind farms are on land. We call these onshore wind farms. Others are in the sea. We call these offshore wind farms. Offshore farms can catch stronger winds. They also do not change how the land looks as much. However, they cost more to build and fix.

Wind is a renewable energy source. This means it will not run out. It also has a small impact on our world. Wind power is very cheap to make. In many places, it costs less than coal or gas. Wind power is also very useful with solar power. This is because wind often blows at night or in winter.

This helps keep our power steady.

Wind power is a way to use moving air to do useful work. For a long time, people used wind for sails or windmills. Today, we mostly use it to make electricity. This is done using wind turbines. These machines are often grouped together in large areas called wind farms. Wind power is a renewable energy source. This means it comes from a source that will not run out. It also has a much smaller impact on our world than burning fossil fuels.

How does a wind turbine work?

Wind is moving air in our atmosphere. When the wind blows, it hits the blades of a turbine. Most large turbines have three blades attached to a part called a nacelle. This nacelle sits on top of a tall tower. The moving blades turn a shaft inside the machine. This movement helps create electricity through a generator. The amount of power we get depends on the wind speed. If the wind speed doubles, the available power actually increases eightfold.

People have been using wind for many years. In the past, we saw windmills and windpumps. Now, we build massive wind farms to power whole cities.

Some wind farms are built on land, which are called onshore farms. Others are built in the sea and are called offshore wind farms. Offshore farms can catch stronger and more frequent winds. They also do not change the look of the land as much as onshore farms. However, building them in the water is more expensive. The Hornsea Wind Farm in the United Kingdom is the largest offshore farm. It has a capacity of 1,218 MW.

Wind power is growing very fast around the world.

In 2024, wind supplied about 2,500 TWh of electricity. This was over 8% of all electricity in the world. Global wind power capacity has exceeded 800 GW. In 2021, about 100 GW of new capacity was added. Most of this growth happened in China and the United States.

In 2024, 30 different countries got more than a tenth of their electricity from wind. Wind generation has nearly tripled since the year 2015. Analysts say we must expand even faster to meet the Paris Agreement goals.

Wind power works very well with other types of energy.

For example, wind is often stronger at night or during the winter. This is a great time when solar power output is low. Using them together helps keep the electricity supply steady. Wind is also one of the lowest-cost ways to make electricity. In many places, new onshore wind farms are cheaper than coal or gas plants.

Even though wind can change, we can use energy storage to help. This makes the power supply more reliable for everyone.

Wind power is the process of capturing kinetic energy from moving air to perform useful work.

Historically, humans used wind for mechanical tasks using sails, windmills, or windpumps. Today, the primary application of wind energy is the generation of electricity. This is achieved through wind turbines, which are often organized into large groups known as wind farms. These farms connect to the electrical grid to distribute power to homes and industries. Wind power is considered a sustainable and renewable energy source. It has a much smaller environmental impact compared to the combustion of fossil fuels.

To understand how wind power works, we must look at the physics of the atmosphere. Wind is simply the movement of air within the Earth's atmosphere. The atmosphere acts like a thermal engine. It absorbs heat at higher temperatures and releases it at lower temperatures. This process creates wind kinetic energy at a rate of 2.46 W/m². The power available from the wind is proportional to the third power of the wind speed. This means that if the wind speed doubles, the available power increases eightfold.

This relationship makes wind speed a critical factor for energy production.

Most modern large-scale wind turbines follow a specific design. They are horizontal axis wind turbines. These machines feature an upwind rotor with three blades. The blades are attached to a component called a nacelle. This nacelle sits atop a tall, tubular tower.

When wind hits the blades, they rotate a shaft inside the nacelle. This rotation drives a generator to create electricity. Most turbines use variable speed generators. These are often paired with a power converter to ensure the electricity is stable for the grid. In a wind farm, turbines are spaced apart to prevent interference. A common distance is 7D, which is seven times the diameter of the rotor.

Wind farms are categorized by their location as either onshore or offshore. Onshore wind farms are built on land. These are often cheaper to build and maintain. However, they can have a greater visual impact on the landscape. Offshore wind farms are located in large bodies of water, such as the sea. These installations can access more frequent and powerful winds. This leads to higher capacity factors, which is the ratio of actual energy produced to the theoretical maximum. Offshore wind currently makes up about 10% of new installations. The Hornsea Wind Farm in the United Kingdom is a notable example. It is the largest offshore wind farm, with a capacity of 1,218 MW.

As wind power expands, engineers face challenges with the electrical grid. Wind is a variable energy source, meaning it does not blow constantly. Because of this, wind power requires energy storage or other dispatchable sources to maintain a reliable supply.

Another challenge is transmission. Wind resources are often located in remote, sparsely populated areas. This is far from the high-density cities that need the power. Long transmission lines can lead to energy losses. If the grid cannot handle the amount of power being produced, a process called curtailment occurs. This is when wind farms must stop running or produce less than they are capable of to prevent grid overload.

Global wind energy production has seen massive growth in recent years. In 2024, wind supplied approximately 2,494 TWh of electricity. This accounted for about 8.1% of the world's total electricity production.

The global installed capacity for wind power has exceeded 800 GW. During 2021, about 100 GW of new capacity was added, mostly in the United States and China. Wind generation has nearly tripled since 2015. In 2024, 30 countries generated more than one-tenth of their electricity from wind. To meet the goals of the Paris Agreement regarding climate change, analysts suggest wind power must expand by over 1% of total electricity generation every year.

Wind power is highly compatible with other renewable energy systems. In many regions, wind speeds are higher during the night or in the winter. This is often when solar power output is at its lowest.

Combining wind and solar power can create a more stable energy supply. Furthermore, wind is one of the lowest-cost sources of electricity per unit of energy produced. In many locations, building new onshore wind farms is more economical than building new coal or gas plants.

This makes wind a central part of the global transition to cleaner energy systems.