Electricity from renewables increased by almost five per cent last year. Now it accounts for nearly a third of total electricity generation across the country. In fact, South Australia has at times seen electricity generated by renewables meet 100 per cent of demand!
So why don’t we just switch all power to renewables right now? Well, it’s not that simple.
Preparing our power system
We are connecting more and more renewables (like large-scale wind and solar farms) and distributed energy resources (like rooftop solar) to the electricity grid. At the same time, we are phasing out fossil fuel generators.
This means we need to make sure we have the right amount of energy available, at the right times and in the right places.
This is a very complex situation. Sometimes we may not generate enough electricity. Sometimes most of the electricity will be supplied by renewables and in a very different way to fossil fuel generators, requiring new sorts of operational mechanisms. There are quite a few challenges.
For example, when we use fossil fuels to produce most of our electricity, it is relatively easy to match the supply of electricity to the demand we predict. Traditionally, electricity demand peaks when everyone gets home in the evening and switches on the lights and television. When everyone switches off and goes to bed, demand is low.
But energy supply from renewable sources varies with wind speed and sunlight intensity. This makes it more difficult to match supply with demand, securely and reliably.
One way to address the variability of renewables is to store excess energy produced when it’s windy or sunny, to meet demand when it’s not.
So, we’re developing energy storage technologies that use thermal energy, batteries and ceramics to manage the variability of renewable energy. Our new Revolutionary Energy Storage Systems Future Science Platform will up the ante on scientific solutions to will take us beyond the limitations of today’s technology.
Energy storage and an integrated electricity grid are two major components of our electricity system of the future.