This lecture explores the potential of renewable energies, such as solar and wind power, to decarbonize the electricity generation sector by 2050. It discusses scenarios, challenges, and innovations in achieving a 100% renewable energy system, emphasizing the economic competitiveness and feasibility of transitioning to sustainable energy sources. The presentation covers topics like electricity capacity, grid-connected generation, energy storage technologies, and the role of hydrogen in the energy transition. The instructor highlights the importance of smart grids, power-to-gas technologies, and heat pumps in reducing CO2 emissions and promoting sustainability.