The Energy Act, published in the Official Gazette of the Republic of Slovenia No. 17/14, which came into force on 22 March 2014, transposed several directives into Slovenian law relating to the electricity and natural gas markets, energy efficiency and renewable energy sources. Among other things, it laid down the principles of energy policy, the principles and measures for achieving a secure energy supply, and regulates the areas of energy infrastructure and heat supply.

In 2020, there was a reorganisation of energy legislation. Specific energy-related matters, which had previously been regulated under the EZ-1, were transferred to separate Acts, with the aim of regulating the areas of energy policy, electricity, natural gas, heat, energy efficiency and renewable energy sources, to facilitate the performance of regulatory and technical tasks by public authorities in this field, and to enable the faster transposition and ongoing harmonisation of national legislation with European legislation. Consequently, the Energy Efficiency Act was adopted in 2020, which sets out measures to promote energy efficiency, to increase energy efficiency and to improve the energy performance of buildings, and also sets out the powers of the authorities carrying out tasks under this Act and the implementation of the state’s policy in the field of energy efficiency. In 2021, the Act on the Promotion of the Use of Renewable Energy Sources (ZSROVE) was adopted, which was replaced in 2025 by ZSROVE-1, which regulates the implementation of national and local authority policy in the field of renewable energy use, sets a binding target for the share of energy from renewable sources in gross final consumption in the Republic of Slovenia, and specifies measures to achieve this target and the methods for financing them. The Act also regulates certificates of energy origin, support measures to promote the production of energy from renewable sources, mechanisms for international cooperation to achieve the share of energy from renewable sources, and self-sufficiency in electricity from renewable sources. The Act also regulates the use of energy from renewable sources and waste heat in the heating and cooling sector, the buildings sector, the industrial sector and the transport sector. Furthermore, the Electricity Supply Act and the Gas Supply Act were adopted in 2021. The Electricity Supply Act sets out the rules governing the functioning of the electricity market, the generation, transmission, distribution, storage and supply of electricity, the rights and protection of end users, the methods and forms of providing public services in the field of electricity transmission and distribution and the electricity market, the principles and measures for achieving a reliable electricity supply, and regulates measures to prevent energy poverty and other issues relating to electricity supply. The Gas Supply Act lays down rules governing the operation of the gas market, the production, transmission, distribution, storage and supply of gas, rules for the protection of consumers, the methods and forms of providing public services in the transmission and distribution of gas, and the principles and measures for ensuring a reliable gas supply, all with the aim of guaranteeing a competitive, safe, reliable and accessible gas supply. In 2022, the Act on the Supply of Heat from Distribution Systems was also adopted, with the aim of independently regulating the distribution of heat and gas from distribution systems that are not connected to the transmission system.

In 2024, the EZ-2 was adopted, which sets out the principles and measures for the management of energy policy, regulates the powers, organisation and operation of the agency and the energy inspectorate, defines energy infrastructure and its construction and maintenance, procedures for the allocation of incentives, and regulates certain other common issues in the field of energy.