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Energy: Wind Turbines

Volume 706: debated on Wednesday 14 January 2009

Questions

Asked by

To ask Her Majesty's Government further to the Written Answer by Lord Hunt of Kings Heath on 24 November (WA 237), why an increase in installed capacity of onshore wind turbines between 2005 and 2006 of 25 per cent resulted in an increase in actual generation of 45.3 per cent but in the following year an increase in capacity of 26.8 per cent resulted in a 26.4 per cent increase in actual generation. [HL335]

The installed capacity of wind turbines on which the percentage increases were based was measured at the end of the calendar year. Much of the installation work for offshore wind turbines is carried out in the summer when offshore weather conditions are usually more conducive to such work. Hence generation from the new turbines will make only a small contribution during their year of installation, but a full contribution during the subsequent year.

Asked by

To ask Her Majesty's Government further to the Written Answer by Lord Hunt of Kings Heath on 24 November (WA 237), why an increase in installed capacity of offshore wind turbines of 42.1 per cent from 2005 to 2006 resulted in an increase in actual generation of 61.8 per cent but in the following year an increase in capacity of 32.9 per cent resulted in a 20.1 per cent increase in actual generation. [HL336]

Official statistics for installed capacity and generation are produced in the Digest of UK Energy Statistics (DUKES). The figures for the years in question are:

Year

2005

2006

2007

Installed Capacity (MW)

213.8

303.8

393.8

Generation (GWh)

403

651

783

The installed capacity of wind turbines on which the percentage increases were based was measured at the end of the calendar year. Much of the installation work for offshore wind turbines is carried out in the summer when offshore weather conditions are usually more conducive to such work. For example, Barrow, a 90MW wind farm came online in July 2006 and Burbo Bank, a 90MW wind farm came online in October 2007. Hence generation from the new turbines will make only a small contribution during their year of installation, but a full contribution during the subsequent year.