Microsoft have got together with a start-up called Verdiem to produce Edison, a free software tool to help save energy usage on PCs.

Gartner Group estimates that 40 percent of all carbon dioxide emissions resulting from information technology and telecommunications are attributable to PCs.

The software is available for free download from Microsoft.

Features include:

• Scheduling. Identify work and non-work schedules to optimize power schemes based on when your PC is in use or on standby.
• Settings. Choose from among several options for power savings and settings.
• Estimated Savings Reports. Find information that shows how PC power settings correlate to money, kWh and CO2 savings.
• Intuitive User Interface. Drag easy-to-use sliding bars to choose settings and instantly see the power and monetary savings. Clearly marked tabs make the interface easy to navigate.