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Dell pledged to go carbon neutral last year, although it declined to set a target date at the time.

The company claims to have achieved the target by improving energy efficiency at its plants and by increasing the use of sustainable energy sources by 870% in the last four years.

Dell also says its headquarters building is entirely run on sustainable sources such as wind and solar power.

"We're driving 'green' into every aspect of our global business," says chairman Michael Dell. "As always, our work is only getting started and this has never been more true than our focus on green."

The company still has some way to go to achieve its higher goal of becoming the "greenest technology company on the planet", however.

Google has already beaten Dell to carbon neutrality, and is awaiting an official audit, we were told by a Google spokesperson this morning.

Google has been investing heavily in sustainable power, purchasing solar panels with more than 1,600 kilowatt total capacity, including the largest corporate solar panel installation in the world.