The energy sector plays a leading role in today's economic and technological world. Energy is the driving force of the economy, as it is essential for the operation of all industries and businesses. In addition, it plays a key role in the development of technologies and innovation, as research and development of new technologies in the energy sector drives progress in many other sectors. Equally, Energy has an impact on the environmental sector and sustainable development as energy saving and the use of renewable energy sources are key factors in both the reduction of emissions of gases/crises and the overall protection of the natural environment. Finally, the energy sector has an important geopolitical importance, as dependence on energy imports can affect the political and economic development of a country. With the Certification of Knowledge on the Energy Sector the professional provides guarantees for the prudent management of all processes involved with energy. Thus, by being strategic, he demonstrates that Sustainable Development and Energy Security are ensured. At the same time, through the Certification, each professional documents that he is implementing all the normative and regulatory principles based on European requirements, while at the same time utilizing energy resources and creating innovative applications. Certification is necessary and useful for professionals such as: Renewable Energy Sources - RES Specialist, Energy Saving and Energy Resource Management Specialist, Blockchain Specialist in the electricity sector, PV and Wind Systems Operation Specialist, Energy Saving and Building Energy Efficiency Improvement Specialist.