Wind farms: turbine ratings, weather and electricity output
Understand how wind turbines generate electricity, why output varies, and how to compare turbine and wind-farm records.
By Power Stations Worldwide · Reviewed 28 September 2026 · Editorial approach
How does a wind turbine generate electricity?
Wind creates aerodynamic forces on the blades, turning a rotor that drives a generator. Some designs use a gearbox and others use direct drive. The resulting electricity is part of a wider electrical installation, so a turbine location and a whole wind-farm boundary are different geographic descriptions.
Does a turbine’s rated MW describe constant output?
No. Rated power describes an output level reached under specified operating conditions. A turbine’s power curve relates wind speed to output, with different behaviour below rated speed and above it. Multiplying the rating by every hour without accounting for changing conditions exaggerates expected energy production.
Sources: US Department of Energy: Wind turbines and severe weather
What are cut-in and cut-out wind speeds?
Cut-in is the wind-speed threshold at which a turbine starts generating; cut-out is a threshold used to stop operation at high winds. Exact values depend on the turbine. These thresholds help explain why an apparently windy site may temporarily have little or no wind generation.
Sources: US Department of Energy: Wind turbines and severe weather
Why might a wind turbine stop during strong winds?
Protective control can shut a turbine down when conditions exceed its operating limits. This is different from claiming the turbine is designed to fail at that wind speed. The manufacturer’s operating envelope and the event’s actual conditions are needed to assess a particular shutdown accurately.
Sources: US Department of Energy: Wind turbines and severe weather
Is a wind-farm record the same as a turbine record?
Not necessarily. One inventory row can represent an entire development while another source records individual turbines or project phases. Read the source record type before counting facilities or summing capacity. A dense cluster of small records does not automatically indicate more generation than one large farm record.
Atlas context: Data coverage and methodology
Are all offshore turbines more productive than onshore turbines?
You cannot establish that from the offshore label alone. Wind resource, turbine characteristics and project conditions matter. The Department of Energy describes how location and terrain affect wind, while offshore and land-based projects have different installation contexts. Compare measured generation over matched periods instead of assuming a universal ranking.
Can annual average wind speed predict a farm’s generation exactly?
No. Wind-resource estimates and turbine-specific performance information are needed to estimate energy, and forecasts remain estimates. A single average omits how often different operating conditions occur. Use the relevant resource assessment and production period; do not translate a country’s average weather into a plant-level generation fact.
How should I investigate a wind station in the atlas?
Start with its reported capacity, source date and whether the entry covers a turbine, phase or farm. Follow the provider reference for technical specifications. Energy Insights shows annual country generation, which is useful system context but cannot verify the performance or current operating state of that specific wind farm.
Atlas context: Data coverage and methodology
Textbook references
The science on this page follows these standard engineering textbooks. See the full bibliography.
- Wind Energy Explained: Theory, Design and ApplicationWind resource, power curves and wind farm output.
- Wind Energy HandbookWake losses and wind farm control.