TY - JOUR N2 - In this paper, selected aspects of energy efficiency are shown. The European Union regulations in area of energy efficiency such as Directive 2012/27/EU, are discussed. The national legal regulations which describe energy efficiency such as the Energy Efficiency Act are presented. Principles concerning the obligation of energy savings and energy audits of enterprises are described. National, regional and local programs and measures concerning the improvement of energy efficiency are performed. These are horizontal measures and energy efficiency measures in: industry, transport, the buildings of public institutions and energy generation and supplies. National economy energy efficiency is shown. The energy intensity indicators (primary, final) and rate of their changes in last years are performed. Moreover, directions of undertakings connected with the possible future reduction in energy intensity of the national economy, are defined. An analysis of energy efficiency measures and solutions for the improvement of energy efficiency, especially in industry and households, is performed. The improvement of economy energy intensity indicators constitutes the most effective solution which brings significant economic, technical and environmental benefits such as an increase in economic innovation and its competitiveness, the improvement of the energy supply security level, a reduction in the consumption of natural resources and a reduction of air pollution and greenhouse gas emissions. The conclusions contain an analysis of the present level of energy efficiency in Poland and the perspectives of its increase in the future along with the benefits connected with it. L1 - http://www.journals.pan.pl/Content/114885/PDF/02-07-do%C5%82%C4%99ga.pdf L2 - http://www.journals.pan.pl/Content/114885 PY - 2019 IS - No 3 EP - 32 KW - energy efficiency KW - economy KW - energy intensity KW - energy policy A1 - Dołęga, Waldemar PB - Instytut Gospodarki Surowcami Mineralnymi i Energią PAN VL - vol. 22 DA - 2019.11.03 T1 - Selected aspects of national economy energy efficiency SP - 19 UR - http://www.journals.pan.pl/dlibra/publication/edition/114885 T2 - Polityka Energetyczna - Energy Policy Journal ER -