The energy transition is a process that will transform the global economy from the use of fossil fuels into a clean, healthy and, most importantly, sustainable economy. There is a need to replace fossil fuel-based infrastructure with renewable energy sources such as solar and wind power, and invest in developing solutions for high-emissions sectors such as steel, cement and aviation. Energy transition is necessary to achieve global climate goals. It also offers opportunities for economic growth, job creation and reduced dependence on limited fossil fuel resources. In the first part of the paper, the concept of energy transition, decarbonization and electrification of transport is explained, then important indicators of the Polish energy market are analyzed, such as energy production and consumption and the important role of coal in the production of electricity. After that, the role of renewable sources, nuclear energy and the importance of the National Energy and Climate Plan were explained. The paper ends with the author's conclusion.