It is the holy grail of the renewable energy sector – a cheap and efficient battery system that can store energy generated by renewables such as wind and solar. These days there are few who doubt the potential of renewables, except those diehards on the extreme of the fossil fuel industry. According to the International Energy Agency (IEA) , the main body monitoring developments in the global energy sector, renewables are surging ahead. Investment in renewables In 2015, investments in oil and gas – fossil fuels that, along with coal, are the main drivers of global warming – declined by 25% , while energy produced from renewables rose by 30%. Renewables are becoming increasingly competitive with fossil fuels in […]