Wind turbine offshore

Offshore wind turbines harness stronger, steadier winds at sea to generate clean electricity.

About this subject

Offshore wind turbines are installed on fixed or floating foundations at sea, reaching heights over 200 meters with blades exceeding 100 meters in length. They capture ocean winds, which are typically stronger and more consistent than those on land, resulting in higher energy efficiency. By 2025, global installed capacity surpassed 70 GW, led by the United Kingdom, China, and Germany. Brazil, with its extensive coastline and favorable wind regime in the Northeast, has an estimated potential of 700 GW for both fixed-bottom and floating turbines, but still lacks a definitive regulatory framework for commercial exploitation.

Beyond electricity generation, offshore wind farms create artificial habitats for marine life. Studies show that turbine foundations act as reefs, attracting fish and invertebrates. However, environmental challenges include bird collisions and interference with shipping lanes. Modern turbines mitigate these with automatic shutdown systems and radar sensors. Installation costs remain high but are declining rapidly: in recent North Sea auctions, the MWh price dropped below €40, competitive with gas-fired power plants.

The future of offshore wind includes ever-larger turbines and projects in ultra-deep waters, such as the Hywind Tampen in Norway, which powers oil platforms. Countries like Japan and the United States invest in floating technology for deep waters. In Brazil, the first offshore wind pilot, a 5 MW turbine, was authorized in 2022 for testing off Rio Grande do Norte, with larger projects expected by 2030 under the National Energy Plan 2050.

Frequently Asked Questions

What is the difference between onshore and offshore wind turbines?

Onshore turbines are on land, while offshore turbines are installed at sea, fixed or floating. Offshore units are larger, more expensive, but capture stronger winds and generate more energy.

How many offshore wind turbines exist worldwide?

In 2025, there are over 10,000 operational offshore turbines, mainly in the North Sea, the UK, and China. Total installed capacity exceeds 70 GW.

Does Brazil have offshore wind energy?

Not commercially yet, but pilot projects have been authorized, such as a 5 MW turbine off Rio Grande do Norte. Brazil's potential is huge, but regulation for auctions is still lacking.