The Australian power company AGL plans to close the huge Liddell coal fired power station by 2022, and replace it with renewables and storage. The Australian Prime Minister Malcolm Turnbull recently pleaded with them to keep it open saying “You can’t run an electricity system just on solar panels and wind farms. You can’t.” Well, Mr Turnbull, you are wrong, and you are holding back the Australian economy with your outdated understanding of emerging technologies. Let me explain.
Australia could use the power of the sun and wind for all its energy needs, for electricity, heating, cooling and transport, 24 hours a day, 365 days a year. There would be many advantages in doing so. Obviously there would be the environmental advantages of cleaner air and plummeting carbon emissions. What is less well understood is that now there would be enormous economic benefits. The costs of renewable energy and of storage technologies continue to fall as repairing old coal fired power stations rises. With renewables, once the equipment is up and running the ongoing costs are minimal, whereas with fossil fuels, as they are burnt, there is the ongoing cost of fuel. With every year that passes the balance tips further in favour of renewables and storage.
Understanding storage is of critical importance. Batteries are the best known form of storage, and in 2017 the number of home energy storage batteries in use in Australia tripled as their cost tumbled, and as costs are projected to keep falling people will keep buying them to back-up their rooftop solar photovoltaic panels. There is now a cumulative capacity of 170MWh in all these domestic scale batteries, and this is bound to keep rising rapidly.
A few months ago, with much fanfare, Tesla opened the world’s biggest battery adjacent to the Hornsdale wind farm in South Australia. It brings another 100MWh of storage onto the system. Many more batteries are planned, both domestic and industrial in scale. In Adelaide there are plans to install solar panels and batteries to 50,000 homes, which would in effect add a virtual power station with 250MWh of storage.
However it is not just batteries that will be used to store all the cheap, clean, wind and solar energy. Tilt renewables are planning a new pumped hydro storage facility in an old quarry in the Adelaide suburbs, with a capacity of 1350MWh storage. They are also planning on adding a 44MW solar array and a 26MWh battery to their 368MW Snowtown Wind Farm, which all taken together with their pumped storage, will greatly increase the usefulness of the wind farm.
Solar Reserve expect soon to start construction of the 150MW Aurora concentrating solar thermal power station, just north of Port Augusta, also in South Australia. This will have eight hours full load thermal storage, thus adding another 1200MWh of storage.
As transport systems switch to hydrogen fuel cells and battery electric vehicles they will soak up vast quantities of surplus solar and wind generated electricity. Hydrogen, methanol and other storage gases and liquids will be used as more ways of storing energy, to add to the batteries, pumped hydro and thermal methods of storage. A 100% renewable energy economy should be every bit as reliable as the existing infrastructure, as well as being less polluting and cheaper.
South Australia has elections coming up on 17th March 2018 and energy policy is a central issue. In 2012 I wrote a blog called ‘Repowering Port Augusta’, where I argued for building renewable energy facilities and then closing down the dirty and decrepit Northern and Playford B coal power stations. Unfortunately these obsolete power stations were closed before the renewables were rolled out, compounding mismanagement and leading to a shortage of electricity, chaos, blackouts and price hikes across South Australia. Jay Weatherill’s Labour Party and Nick Xenophon’s SA Best Party have both now come to understand the need to switch to a renewables based economy. Please Malcolm Turnbull and Steven Marshall get your Liberal Coalition Parties up to speed with what is now technically possible and what the advantages might be for the Australian economy. Please help roll out the whole raft of renewable and storage technologies as fast as possible, ideally before obsolete old Liddell closes in 2022!