South Australia to get $1bn solar farm and world’s biggest battery

System will include 3.4m solar panels and 1.1m batteries, with operations set to begin by end of 2017

Uruguay makes dramatic shift to nearly 95% electricity from clean energy

In less than 10 years Uruguay has slashed its carbon footprint and lowered electricity costs, without government subsidies. Delegates at the Paris summit can learn much from its success

Swiss pilots to attempt first around-the-world solar flight

Bertrand Piccard and André Borschberg will take turns piloting the single seater Solar Impulse 2 plane that is propelled solely by the sun