On Thurdsay, Apple announced its environmentally friendly plans , and revealed that its Maiden, North Carolina data centre will have 60 per cent of its power produced on site from renewable sources. The other 40 per cent will be purchased from local and regional renewable sources.

, projecting messages from Twitter and Facebook users who are dismayed at Apple's use of coal at the data centre that powers its iCloud sources.

"Apple's announcement today is a great sign that Apple is taking seriously the hundreds of thousands of its customers who have asked for an iCloud powered by clean energy, not dirty coal," said Greenpeace International Senior IT Analyst Gary Cook. "Apple's doubling of its solar capacity and investment in local renewable energy are key steps to creating a cleaner iCloud."

"Greenpeace will continue to campaign to push Apple - and other IT giants like Microsoft and Amazon - to clean the cloud until Apple has policies to ensure that as Apple's North Carolina data centre and others continue to grow, they will grow using exclusively clean energy," said Cook. "To garuntee that, Apple must adopt a firm siting policy to prioritize renewable energy when it chooses locations for new data centres. Only then will customers have confidence that the iCloud will continue to get cleaner as it grows."

Apple is building the largest non-utility in the US, and the nation's largest private solar arrays, in order to provide the green energy, said the company.