# [TECH] Wind Turbines
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**Wind Turbines** convert the kinetic energy of wind into electricity, enabled by advances in aerodynamics, materials science, and power electronics, now the cheapest source of new electricity generation in many regions.
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## Overview
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Horizontal-axis wind turbines derive from propeller aerodynamics (Betz limit: maximum 59% of wind energy extractable). Offshore wind (1991, Vindeby, Denmark) extended the resource. Modern turbines exceed 15 MW with 120 m blades designed using CFD and composite materials. LIDAR wind measurement, active blade pitch control, and grid integration software optimise output. By 2023, global installed capacity exceeded 950 GW, generating ~7% of global electricity.
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## Key Actors
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- **Companies**: Vestas (Denmark, 1945/wind 1979), Siemens Gamesa (2017), GE Renewable Energy, Goldwind (China), Ørsted (offshore, 1972)
- **Inventors**: Johannes Juul (1887–1969, modern HAWT), Ulrich Hütter (1910–1990, composite blades)
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## Key Patents
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Wide patent portfolios in aerodynamics, pitch control, power electronics. Vestas, GE, and Siemens Gamesa each hold thousands of wind turbine patents.
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## Economic Value
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Global wind energy market: **$120 billion/year** (2023, GWEC). Generating ~2,100 TWh/year of electricity. Expected to grow to $500B+/year by 2030. Levelised cost of offshore wind: $0.07–0.12/kWh (IRENA 2023).
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## Notes
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GWEC *Global Wind Report* 2023. IRENA *Renewable Power Generation Costs* 2023.
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# Parents
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* [SCI] Aerodynamics⏎