The skies are threatening to pour on the Apple solar farm but as the woman in charge of the company's environmental initiatives points out: the panels are still putting out some power. Apple is still greening its act.

The company, which once drew fire from campaigners for working conditions in China and heavy reliance on fossil fuels, is now leading other technology companies in controlling its own power supply and expanding its use of renewable energy.

After converting all of its data centers to clean energy, the Guardian understands Apple is poised to use solar power to manufacture sapphire screens for the iPhone 6, at a factory in Arizona.

And in a departure for its reputation for secretiveness, Apple is going out of its way to get credit for its green efforts.