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Wind power has become one of the fastest expanding sources of electricity on the planet. In 2023, wind turbines generated around 7.8 percent of the world's electricity, more than double their share a decade earlier, and total installed capacity passed one terawatt for the first time. Denmark, the historic pioneer of the industry, now obtains more than half of its electricity from wind on an annual basis, a figure that many grid engineers once dismissed as technically implausible for a modern industrial economy.
The modern wind turbine is an engineering achievement on a monumental scale. The largest offshore machines stand roughly 260 metres tall, with rotors spanning 240 metres, wider than two football pitches placed end to end. A single turbine of this class can generate up to 15 megawatts, and one full rotation of its blades produces enough energy to power an average British household for more than two days. Offshore farms also benefit from steadier, stronger winds: their capacity factor, the share of theoretical maximum output actually achieved, often exceeds fifty percent, compared with thirty to thirty-five percent for typical onshore sites.
Falling costs explain much of this expansion. The average cost of electricity from new onshore wind farms has declined by about seventy percent since 2010, according to the International Renewable Energy Agency, making wind one of the cheapest sources of new power in most of the world. In British subsidy auctions, offshore wind developers have offered to generate electricity at prices well below the cost of power from new gas plants, an outcome that few analysts would have predicted a decade ago. Supply chains have matured in parallel, with factories in Denmark, Germany and China now producing blades, towers and cables at industrial scale.
Yet wind's greatest weakness is its variability. Output rises and falls with the weather, and a calm week in midwinter can slash generation precisely when demand for heating reaches its peak. Grid operators respond with a combination of tools: more accurate forecasting, which now predicts output a day ahead with errors of only a few percent; interconnectors that trade electricity with neighbouring regions; and storage, ranging from batteries that smooth second-by-second fluctuations to pumped hydro reservoirs that can hold energy for days. None of these solutions is sufficient alone, but together they have allowed some grids to absorb wind shares that were once considered unmanageable.
Wind projects also face environmental and social objections. Turbines can kill birds and bats, although studies suggest the toll is far smaller than that caused by domestic cats or collisions with glass buildings. Onshore farms generate complaints about noise and visual impact, and offshore construction can disturb marine mammals and temporarily close fishing grounds. Developers increasingly mitigate these effects by painting one blade black to warn approaching birds, pausing turbines at night when bats are active, and timing pile-driving to avoid sensitive breeding seasons.
The next frontier is floating wind. Conventional offshore turbines are fixed to the seabed, which limits them to water less than about sixty metres deep, but floating platforms held in place by anchored cables can operate almost anywhere. The Hywind Scotland project, the world's first commercial floating wind farm, has been producing electricity since 2017 with capacity factors that surprised even its designers. Floating technology could open the deep waters off Japan, Norway and the western coast of the United States, where conventional foundations are simply impossible.
Looking ahead, the industry must also manage its own life cycle. The first generation of European wind farms is reaching the end of its design life, and repowering these sites with larger modern machines can triple their output while using fewer turbines. Blade recycling remains an unsolved problem, since the composite materials resist conventional processing, though several factories in Europe now shred retired blades for use in cement. If governments sustain their current policies, the International Energy Agency projects that wind could supply more than a quarter of global electricity by 2050, a transformation as profound as any in the history of power generation.