Wind power converts kinetic energy in moving air into electricity. It is the second largest renewable source after hydro, growing rapidly, and increasingly cheap. This guide walks the fundamentals, the industry, and where wind is going.
How wind power works
Air flowing over the curved surface of a turbine blade creates lift. Lift produces torque on the rotor. The rotor drives a generator either directly or through a gearbox. See our companion article on how wind turbines generate electricity for the detailed engineering.
Onshore vs offshore
| Attribute | Onshore | Offshore |
|---|---|---|
| Turbine size | 3 to 6 MW typical | 10 to 18 MW modern |
| Capacity factor | 25 to 45% | 40 to 55% |
| Cost per MW | USD 1 to 1.6 million | USD 2.5 to 5 million |
| Speed of deployment | Faster | Slower |
| Public acceptance | Sometimes contested | Less direct |
Global scale
Cost trajectory
Onshore wind LCOE has fallen from USD 90 per MWh in 2010 to USD 30 to 50 in strong resource regions. Offshore has fallen similarly. Continued improvements from larger turbines, better siting, and scaled supply chain.
Modern turbine technology
Turbines have grown 10x in the past two decades. Modern onshore turbines are 3 to 6 MW; offshore 12 to 18 MW. Larger swept area captures more energy; larger rotor sizes drive cost per MWh down.
Grid integration
Wind is variable but predictable a few hours ahead. Grid operators use forecasting, flexible generation, and storage to integrate. High wind penetration markets (Denmark, Germany, Iberia) have developed sophisticated integration practice.
Where wind is strongest
| Region | Notable wind resource |
|---|---|
| US Great Plains | Strong onshore |
| Northern Europe | North Sea offshore |
| Coastal Chile | Steady onshore and offshore |
| Central Asia | Strong onshore |
| Southeast Australia | Onshore and offshore |
| East China coast | Growing offshore |
Environmental considerations
- Bird and bat collisions (managed through siting).
- Visual impact (siting concern).
- Noise (typically 35 to 45 dB at nearby distance).
- Shadow flicker (managed through siting).
- Land use (small direct, larger site including spacing).
Floating offshore wind
Floating turbines enable deep water offshore wind. Growing rapidly. See our companion article on offshore wind complete guide.
Repowering
Policy support
Auctions have replaced feed in tariffs as the dominant support mechanism. US Inflation Reduction Act tax credits; EU offshore auctions; UK Contracts for Difference.
Major markets
China leads by installed capacity. US, Germany, India, Spain, UK follow. Emerging markets in Southeast Asia, Latin America, Africa scaling.
Where wind is going
- Continued turbine size growth.
- Floating offshore expansion.
- Grid forming inverters replacing synchronous behaviour.
- Hybrid wind plus storage projects.
- Cost continued reductions.
- Hard to abate sector coupling.
Frequently asked questions
How much wind is there?
Roughly 8 percent of global electricity in 2024.
Is wind reliable?
Variable but predictable a few hours ahead. Integrates well with adequate flexibility.
Do turbines kill birds?
Yes, at rates far lower than buildings or cats. Managed through siting.
How large are modern turbines?
3 to 6 MW onshore, 10 to 18 MW offshore.
Is wind cheap?
Cheapest new electricity in strong resource regions.
Can wind power replace fossil generation?
Combined with solar and storage, yes for large share of grid.
How reliable are turbines?
Very. 97 percent availability typical.
How long do turbines last?
25 years design life. Repowering extends effective site life.
Which country leads?
China by installed capacity.
Where can I see wind farms?
The UtilityRadar directory lists wind farms globally.
Summary
Wind power has become one of the cheapest sources of new electricity in strong resource regions. Onshore dominates capacity; offshore is growing fast with higher capacity factors. Modern turbines have grown 10x in two decades. Integration with the grid is well developed. The industry continues growing at 10+ percent annually and will play a major role in decarbonising electricity.
Next reading
- How wind turbines generate electricity
- Offshore wind complete guide
- Renewable energy complete guide
- Browse the UtilityRadar directory
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