Apple claimed it’s on course to beat green energy targets for its supply chain after doubling the number of suppliers signed up for 100%-renewable production.

The US technology giant said 44 suppliers now run all their Apple-related production using clean output, after a clutch of new additions to its all-renewable programme.

Apple is now set to bring more than 5GW-worth of renewables into its supply chain by 2020, compared with an earlier target of 4GW, the iPhone-maker said.

The new names signed up include SDK, Solvay, STMicroelectronics, Corning and Quadrant.

Apple said last year that all its own global facilities are now covered by 100%-renewable energy.

Apple is among a clutch of US technology majors – Google and Facebook are others – that emerged as early corporate backers of renewables, either by signing deals to power their own operations or investing in projects.

That trend has since been followed by a growing number of industrial corporates, such as automakers GM and Ford.