The scheme of accelerated capital allowances for expenditure on new specified energy-efficient equipment referred to by the Deputy in the details supplied with the question, allows companies to write-off the full cost of such equipment against their taxable income in the year the expenditure is incurred. The scheme came into operation in late 2008 for a 3 year period and does not apply to expenditure by private individuals.
Data on the overall use of the scheme was requested from companies in the Corporate Tax return (CT1) for the first time in respect of accounting periods ending in 2009 but it does not require separate identification of claims in relation to wind turbines under the scheme.
The only available information in respect of wind turbines relates to relief for investment in renewable energy generation provided for under Section 486B, Taxes Consolidation Act, 1997. The total amount of corporation tax foregone as a result of this scheme is estimated at close on €10.4 million since inception to end 2008, the latest year for which figures are available.