The freeware utility Granola is an intelligent power management solution for Windows and Linux systems (Desktops, Laptops , x86 servers) that automatically optimizes a system to use energy more efficiently without compromising performance. It uses Dynamic Voltage and Frequency Scaling (DVFS) which is available on most modern Intel and AMD processors for saving energy. And it claims that it can lower total system energy use by 10-35% even when a system is 100% utilized. Key Features of Granola: You can download this free energy saving utility at source.