5.
Directive 2010/31/EU of the European Parliament and of the Council of 19 May 2010 on the energy performance of buildings (recast) · European Union
‘primary energy’ means energy from renewable and non-renewable sources which has not undergone any conversion or transformation process;
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Source: EUR-Lex (Cellar) · retrieved 2026-10-28 · Text as adopted (Official Journal); later amendments are not incorporated in this text.