Granola Windows application reduces "energy waste" coming from using a computer and leaving it on all the time. The program, smaller than a single MP3, is a “set it and forget it” type of application that automatically optimizes system settings without compromising performance or availability. Granola typically lowers the total system energy use by 10-35% even when a system is 100% utilized, website claims. It also tracks energy saved in order to estimate cost savings and carbon emission reductions. “Granola uses a technology called dynamic voltage and frequency scaling or DVFS which’s analogous to a “dimmer switch” on a light,” says the company. When you don’t need brightest light, you can dim it via a switch. DVFS works in a similar way – when it needs CPU at full speed, it allows that, but when the PC is in a lower state of activity (like reading a website instead of playing a game), it uses less energy.