The regulations of the 3rd European Energy Package which includes legislation concerning Smart Grids and Smart Meters was implemented in the Austrian energy law. Therefore a big part of the Austrian population will be equipped with Smart Meters and will be embedded in Smart Grids until the year 2020. Due to this comprehensive launch and the therefore possibly emerging interferences and chances, this diploma thesis analysis the national implementation of the regulation in electricity, gas, data privacy and telecommunication laws. In doing so, various legal questions are uncovered, shortcomings are identified and subsequently improvement potentials are depicted and possible solutions are given. The comparison with the implementation of the European Union energy regulations in Germany brings additional insights into alternative approaches in legislation. The legal questions are covering areas like the handling of detailed data of consumption, incentive driven tariffs, upcoming costs for the setup of smart meters, unbundling regulations, data security regulations or the construction and usage of communication networks.