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How do wind turbines work, and how much power does one make?

Updated

General information, not a substitute for the advice of an attorney.

Short answer: A turbine's blades work like airplane wings. Moving air creates lower pressure on one side of each blade, and the resulting lift, which is stronger than the drag, spins the rotor; the rotor turns a generator either directly or through a gearbox (DOE Wind Energy Technologies Office). The average new land-based turbine installed in the United States in 2023 was rated at 3.4 MW (Land-Based Wind Market Report 2024). Our arithmetic: at the 2025 U.S. wind fleet capacity factor of 33.8% (EIA Table 4.08.B), 3.4 MW x 8,760 h x 0.338 is about 10,070 MWh a year.

The machine

  • Most utility turbines are horizontal-axis machines with three blades that face into the wind ("upwind"); vertical-axis designs such as the eggbeater-style Darrieus exist and need not be turned to face the wind (DOE).
  • A gearbox, where used, speeds up the rotation so the generator can be physically smaller; direct-drive designs skip it (DOE).
  • Land-based turbines range from 100 kilowatts to several megawatts; machines under 100 kW serve homes, farms, and small businesses (DOE).

How big they are now

LBNL's market report for the Department of Energy gives these 2023 U.S. averages for newly installed land-based turbines: nameplate capacity 3.4 MW, up 5% from 2022; hub height 103.4 meters, up 5%; rotor diameter 133.8 meters, up 2% (Land-Based Wind Market Report 2024). The U.S. added 6,474 MW in 2023 for a cumulative total of nearly 150,500 MW, with $10.8 billion invested that year; globally, 2023 additions were a record 117 GW (same report).

How much one produces

A turbine's rating is the most it can produce, not what it averages. EIA's final capacity factors for U.S. utility-scale wind were 33.8% in 2025 and 34.3% in 2024, up from 32.2% in 2015 (EIA Table 4.08.B). Applying the 2025 fleet figure to a 3.4 MW machine gives about 10,070 MWh a year (our arithmetic, both inputs cited above). New, taller turbines at good sites can beat the fleet average, and the market report page we opened does not state a capacity factor for new projects, so we do not quote one.

See what the disadvantages of wind energy are, grid interconnection by market, the ERCOT queue, and substation versus transmission line.

General information from the sources linked above, not legal, tax, or financial advice.

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