We’re just two weeks away from the international climate summit in Glasgow, and the Morrison government has yet to announce whether it will commit to a stronger climate target for 2030. The current 2030 target, set at the Paris Agreement, is to cut emissions by 26-28% below 2005 levels. This has been widely criticised as being weak.

As a professor of engineering and an author of many research papers considering what’s needed to reach 100% renewable energy, I believe Australia can do far better. With minimal cost and inconvenience, Australia could reduce emissions to about half its 2005 levels, by 2030.

Setting this target would match our key ally and trading partner, the United States, and would be broadly in line with the targets of other allies, the European Union and the United Kingdom. It would see Australia become a valued and relevant party to the negotiations at Glasgow, rather than a resented freeloader.

So let’s look at what it takes to get there, and why it wouldn’t be difficult.

By the megatonnes

The top three sources of Australia’s emissions are electricity (34%), heating from burning fossil fuels in homes and factories (20%), and transport (18%).

Australia’s emissions baseline year is 2005, when the total emissions were 612 million tonnes (megatonnes) of carbon dioxide equivalent.

By 2020, emissions had fallen to 498 megatonnes, mostly because the rates of land clearing, another big source of emissions, are much lower now than in 2005.

This puts us well on track to meet and beat Australia’s current 2030 target, which equates to about 453 megatonnes. We will easily reach this soft target by continuing to displace coal generation of electricity with solar and wind at the current rate of 7 gigawatts per year, provided we avoid new sources of emissions.

Read more: Yes, Australia can beat its 2030 emissions target. But the Morrison government barely lifted a finger

Earlier this year, United States President Joe Biden announced his commitment to reduce US emissions 50-52% by 2030.

Australia should offer to match this at the Glasgow summit. Cutting, say, 51% of Australia’s 2005 levels would bring Australia’s emissions down to just 300 megatonnes in 2030.

OK, so how do we do it?

The task of reaching 300 megatonnes in 2030 is straightforward, and with around zero net cost. It would see:

  • 90% of electricity generation coming from solar, wind and hydro in 2030 (three-quarters of the task)

  • 90% of new sales of vehicles and heating equipment be electric from 2027 (one-quarter of the task)

  • no new emissions sources. For example, encouraging fossil gas companies to frack large new areas makes the task more onerous because of methane leakage.

Let’s look at transport first. Curtailing sales of petrol vehicles with a combination of incentives and regulation would see nearly all vehicles become electric by the mid-2030s, as old cars retire.

While the federal government has been famously unenthusiastic about electric vehicles, states and territories are already offering modest incentives.

All vehicles could become electric when older cars retire. Shutterstock

The bulk of emissions cuts will come from the electricity sector, because the cost of solar and wind technology has fallen below coal and gas.

As of this month, Australia’s National Electricity Market derives 36% of its electricity demand from renewables (mostly solar and wind), and is tracking towards 50% in 2025. Coal burning makes up 60%, but is falling quickly because of growing competition from solar and wind. Gas generation has fallen to just 4%.

Read more: Up to 90% of electricity from solar and wind the cheapest option by 2030: CSIRO analysis

The wholesale market price has also fallen sharply from 2020, as a flood of new solar and wind farms entered the market. This means the faster we deploy solar and wind, the lower electricity prices will be and the faster we reduce emissions.

The biggest impediment to rapid deployment of solar and wind is a lack of new transmission cables to bring new solar and wind power from the regions to the cities. The government needs to facilitate a national transmission network to get rid of congestion when transmitting renewable electricity — then stand back as solar and wind farm companies rush to utilise it.

Australia has a wealth of sunlight, giving us huge potential for deploying solar power. Shutterstock

Australia’s natural advantage

Not only is the market for renewable energy dramatically improving, Australia also has a natural advantage. Compared with most other developed nations, Australia has excellent solar and wind resources where most people actually live, near the sea.

Australia also has a big head start on installing rooftop solar, solar farms and windfarms, helped along by strong Australian-developed solar technology and political support between 2007 and 2013.

In fact, in 2020 Australia was among the top three global leaders in deploying new renewable energy capacity, alongside the Netherlands and Norway, as the chart below shows. These three nations deployed new renewables per capita at 10 times the global rate, and between three and five times faster than China, Japan, Europe and the USA.

Data for this chart is from the International Renewable Energy Agency. Andrew Blakers, Author provided

The fastest change in global energy systems in history is underway. Due to their their compelling economic advantage, solar and wind provided three-quarters of new electricity generating capacity worldwide, and 99% of new capacity in Australia, in 2020.

Cutting further to 100 megatonnes

Reducing emissions to 300 megatonnes in 2030 would place Australia on track to just 100 megatonnes sometime in the 2030s, at low cost. We’d eventually see emissions fully removed from electricity, land transport and heating as, for example, electric vehicles replace retiring older cars and retiring gas heaters are replaced.

It’s also important to note that every year, coal and gas mining releases around 50 megatonnes of “fugitive” methane emissions — leaks from coal mining and gas fracking. But this, too, will vanish in Australia when other countries stop buying Australian coal and gas. Presumably, this will be before 2050 as other countries make good on their promises to decarbonise.

Read more: How an Aussie invention could soon cut 5% of the world’s greenhouse gas emissions

The technology we need to reach 100 megatonnes of emissions is already available at low cost from vast production runs: solar, wind, energy storage (via pumped hydro and batteries), transmission cables, electric vehicles, heat pumps and electric furnaces. Continued research and development will make these costs even lower.

So what’s left over to get to net-zero?

Remaining emissions come from aviation, shipping, industry (cement, chemicals, metals), land clearing and agriculture. These sectors need plenty of research and industrial development to decarbonise, but we have time to do this over the next decade if we halve emissions by 2030.

Given Australia has plenty of land, good wind and much better solar than its rivals, it would be unconscionable for Australia to have a softer emissions target than the US, UK and EU at the Glasgow.

We don’t need new taxes, nor hydrogen, nor carbon capture and storage, nor a “gas-led recovery”. But we do need the federal government to either get involved or get out of the way.

Read more: Climate wars, carbon taxes and toppled leaders: the 30-year history of Australia’s climate response, in brief

The Conversation

Andrew Blakers receives funding from ARENA and similar organisation

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