52Accordingly, as regards the form that support schemes may take, recital 14 in the preamble to Directive 2001/77 does no more than list the various kinds of measures to which the Member States generally have recourse in that connection, namely, green certificates, investment aid, tax exemptions or reductions, tax refunds and direct price support schemes (see judgment in IBV & Cie, EU:C:2013:598, paragraph 64).
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