Photo of Chris Heaton-Harris

Chris Heaton-Harris (Daventry, Conservative)

To ask the Secretary of State for Energy and Climate Change what the average efficiency of on-shore wind turbines was in each of the last 12 months.

Photo of Charles Hendry

Charles Hendry (The Minister of State, Department of Energy and Climate Change; Wealden, Conservative)

We understand this question to mean load factors, rather than efficiency. DECC produces load factors for onshore wind, on a quarterly basis. These can be found for the last four quarters in the following table.

Year/ Quarter Onshore wind load factor (percentage)
2010 Q3 21.9
2010 Q4 25.7
2011 Q1 26.3
2011 Q2 27.0
Note: Quarterly wind load factors are produced on a standard basis, rather than the unchanged configuration basis used for annual load factors. Source: Energy Trends table ET 7.1—available at:


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