Electronic communications are in the process of a major transformation in which a key role is played by communications service providers, but a large part of the responsibility for the successful transformation lies with the national regulators. The transformation is reflected in the convergence of services in the communications industry, and in such a convergent environment, the model of converged regulator is imposed as a result of optimal organization from the perspective of the convergence of technologies, encourage technological development and market development communication. The trend of globalization and the boundaries between the sectors of electronic communications and broadcasting and convergence related activities in terms of connectivity infrastructure, services and facilities, leading to the need of merging two related regulatory bodies under one roof. This led to the strengthening of the regulatory role, better coordination of operations, better information sharing and reduce administration costs for business rationalization , which is why the consolidation of regulatory agencies is popular in both worldwide and in the EU countries. The emergence of cross-sectoral regulators in the world usually includes electronic communications, postal services and broadcasting, but in some cases, multi-sectoral regulation includes several related public services under one roof, such as telecommunications, postal, electricity, gas and rail transport. Creating a multi-sectoral regulator in the Republic of Croatia, which would regulate electronic communications and broadcasting would lead to the creation of flexible administration able to respond to market needs, which would better cope with the constant technological and regulatory changes and developments taking place in the ICT sector. Further development of a strong and independent regulator in Croatia would be merging HAKOM and Croatian energy Regulatory Agency, because a multi-sectoral market regulation of network activity precondition for raising the efficiency of regulation of these related sectors. This would lead to better protection of end-users, better protection of the public interest and would increase economic growth of the Republic of Croatia.