(129)In order to adapt to rapid technical, economic and regulatory developments, the power to adopt acts in accordance with Article 290 TFEU should be delegated to the Commission in respect of a number of non-essential elements of this Directive. Due to the need to comply with international agreements, the Commission should be empowered to modify the technical procedures for the calculation methods concerning thresholds as well as to periodically revise the thresholds themselves and to adapt Annex X; the lists of central government authorities are subject to variations due to administrative changes at national level. These are notified to the Commission, which should be empowered to adapt Annex I; references to the CPV nomenclature may undergo regulatory changes at Union level and it is necessary to reflect those changes into the text of this Directive; the technical details and characteristics of the devices for electronic receipt should be kept up to date with technological developments; it is also necessary to empower the Commission to make mandatory technical standards for electronic communication to ensure the interoperability of technical formats, processes and messaging in procurement procedures conducted using electronic means of communication taking into account technological developments; the list of legal acts of the Union establishing common methodologies for the calculation of life-cycle costs should be quickly adapted to incorporate the measures adopted on a sectoral basis. In order to satisfy those needs, the Commission should be empowered to keep the list of legal acts including life-cycle costing methodologies up-to date. It is of particular importance that the Commission carry out appropriate consultations during its preparatory work, including at expert level. When preparing and drawing up delegated acts, the Commission should ensure a simultaneous, timely and appropriate transmission of relevant documents to the European Parliament and to the Council.