This lecture discusses the challenges of energy consumption in data centers, focusing on the unsustainable trends and the need for energy-efficient solutions. It covers the development of energy-scalable server architectures, innovative cooling technologies, and a multi-objective controller for geo-distributed data centers. The approach involves system-level energy-efficient integration, ultra-adaptive server technology, and a revolutionary energy-free mini-thermosyphon cooling system. The lecture also highlights the industrial impact of rack management and smart power distribution units, emphasizing the importance of energy-efficient data centers for the Swiss economy. Key outcomes include significant energy savings, improved performance, and cost reductions.