Fact Check: Does Australia have too much electricity?

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Australia has the capacity to produce more electricity than it needs – but that’s not a reason to scale back the Renewable Energy Target.

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The Conversation

Indigo Skies Photography/Flickr, CC BY-NC-SA

We have 9,000 megawatts (nine big power stations equivalent) of excess capacity in electricity generation … We have more than 15% overcapacity in generation in Australia – Industry minister Ian Macfarlane, ABC Radio, September 9.

Capacity and supply

In electricity markets, “capacity” is used to describe the total potential technical capacity (in megawatts) of a system. The total capacity in the National Electricity Market (NEM) is approximately 50,000 megawatts. “Energy” is often used to describe the output, or the electricity that is actually delivered.

The National Electricity Market is an “energy-only” market — capacity isn’t traded. We consider these markets in balance when there is 15% more capacity than the expected peak demand for electricity. The NEM has been in a state of structural over-supply for some time now — currently close to 30% over expected peak demand.

A key aim of the Australian Energy Market Operator (AEMO) is to “promote efficient investment in and operation of Australia’s electricity and gas markets”.

As part of this AEMO, prepares an “Electricity Statement of Opportunities”, that highlights generation and demand-side investment opportunities. In the latest update, rather than investment opportunities, Australian Energy Market Operator reported on the surplus capacity throughout the National Electricity Market:

“There is potentially between 7,650 megawatts and 8,950 megawatts of surplus capacity across the National Electricity Market in 2014–15. Approximately 90% of this is in New South Wales, Queensland, and Victoria.”

The operator modelled three economic scenarios — high, medium and low growth. For the first time in the history of the National Electricity Market, the modelling shows that no new capacity is required over the next ten years. The figure below illustrates that this surplus capacity may increase or decrease, depending on the scenario.

Range of surplus capacity forecasts in the National Electricity Market over the next 10 years. AEMO

Enter the RET

This is a point echoed by the latest Renewable Energy Target review from a panel led by businessman Dick Warburton. The current levels of oversupply are used to argue for no new investment in renewable energy:

In a market environment where capacity is already oversupplied and demand may continue to decline it is quite reasonable (and efficient) for no new investment in capacity to occur.

This may be true. However this argument confuses the role of the RET with the role of the National Electricity Market. As the Panel’s report points out, the “NEM was designed to correct [oversupply in the market]”. The objectives of the RET, on the other hand are to:

  • encourage the additional generation of electricity
  • to reduce emissions of greenhouse gases
  • to ensure that renewable energy sources are sustainable.

Given that they are the objectives of the legislation, these represent a useful measuring stick to evaluate its performance against. The legislation itself actually provides guidance on the review process, including:

the Climate Change Authority must conduct reviews of the following:
(a) the operation of this Act and the scheme constituted by this Act …

Minister Macfarlane also claimed that the government was “simply keeping to the legislation” in reviewing the target.

But as we’ve seen the supply-demand balance of the market does not feature in the RET’s remit. And nor should it — that is after all the purpose of the NEM.

Indeed if the RET was left untouched, an efficient market should correct the supply-demand imbalance on its own, via the least profitable generation withdrawing from the market. And in this process, consumers may benefit from lower electricity prices.

Arguing that oversupply justifies no new investment is just one side of the equation. An equally reasonable argument might be that the RET is functioning fine, delivering on its objectives and left be, the NEM will re-correct the supply imbalance, just a different way. Whether or not you think this is “efficient” outcome likely depends on whether or not you think climate change is real.

Minister Macfarlane has also claimed that the RET “no longer aligns with the percentage target”.

But in the RET legislation there is no mention of even a 20% target (“real” or otherwise). Instead there is a 41,000 gigawatt hour target for 2020. This was originally estimated to represent approximately 20% of electricity generation in 2020. The original policy commitment was actually for “the equivalent of at least 20 per cent of Australia’s electricity generation comes from renewable resources by 2020”.

Indeed there is no mention in the legislation of (a hand picked) Department of Prime Minister and Cabinet review, for that matter: it says reviews are to be conducted by the Climate Change Authority. Since the Government has been unsuccessful in dissolving the Climate Change Authority, and assuming the Climate Change Authority fulfils its legislative requirements, perhaps we may see another review by the end of the year.


The Minister’s statement is factually correct. According to Australian Energy Market Operator, there is between 7.5-9 gigawatts of surplus capacity (though the capacity overhang is greater than 15%). However it is a non sequitur to use this to justify radical reform of the Renewable Energy Target.


There is certainly widespread agreement that there is a substantial amount of excess generation capacity in the National Electricity Market for at least the next decade, as both Mr Macfarlane and the Fact Checker state.

The Fact Checker is also correct to state that the RET legislation is silent about changing the RET in such a situation, and that the RET operates as a completely separate mechanism from the electricity market: for example, certificates are accounted for over each year, while the electricity market “balances” electricity supply and demand many times each day.

The Fact Checker is also correct that to propose that investment in new renewable energy generation should be halted to solve a problem in the electricity market is a non sequitur. The Fact Checker’s position can be supported in several ways.

First, if government applied a similar approach in other areas where emerging competitors create excess capacity in an existing industry, our economy would stagnate.

For example, when the gas industry took market share from electricity, it did not have to consider its impacts on the electricity industry. Similarly, the developers of mobile phone networks did not have to limit their expansion due to excess Telstra landline capacity. Building a freeway can create excess capacity in competing public transport services. And so on.

Second, the electricity regulators and the industry itself could adopt a wide range of options to address the excess capacity problem, for example, by simply allowing the industry to “shake out”. At present we are seeing exactly this in the mining industry, where high cost producers are struggling because demand for iron ore and coal has fallen short of expectations.

The National Electricity Market Objective calls for the market to operate in the “long term interests of consumers”, not the profits of the existing industry. The capacity excess and the RET are both driving lower prices, while the RET is encouraging the installation of the kind of generation capacity we need in a low carbon future, which is clearly in the long term interests of electricity consumers.

Third, government could influence which generator closures occur, for example by setting tough environmental standards that would discourage dirty power stations, which are often older, and the value of which should have been substantially depreciated over their past lives.

The Fact Checker is correct to draw attention to the illogical use of the existence of excess electricity generation capacity to attempt to justify cutting the Renewable Energy Target, and the fact that the RET legislation specifies a 2020 target of 41,000 GWh, not “20% of electricity”. Given the strong community support for renewable energy, only the incumbent electricity industry could see the RET’s “over-achievement” as being a bad thing.

The Conversation

Source: The Conversation. Reproduced with permission.

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  1. Rob G 5 years ago

    In simple terms the government is interfering with this market with its vested interests in coal. Consumers are entitled to choose their energy from fair market competition. The end result, as most sensible people realise, is that we need to retire about 8-9 coal fire stations.

    • Owen Griffiths 5 years ago

      The whole point of the RET is to NOT allow consumers to choose from fair market competition, but to specifically prefer government chosen technologies.

      • Chris Fraser 5 years ago

        It should be ARENA that may have a preference for specific technology, but does not have a say in how much we get.

      • Rob G 5 years ago

        Not sure I understand your angle. Care to offer some further explanation as to how the RET does this?

        • Owen Griffiths 5 years ago

          It’s not my angle – this is the sole reason for the scheme to exist. The government has mandated that a certain amount of energy must have come from certain methods.

          The reason renewable energy producers don’t like talk of changes to the scheme is because they know consumers will not voluntarily buy their product, at least not in current quantities.

          If the government passed a law that all car retailers had to sell 1 convertible for every regular car they sold (or purchase a certificate from someone who sold extra convertibles), the government would be interfering in the market, no?

          • Chris Fraser 5 years ago

            It’s more like, for any car you choose to buy, 20% or even 27% of that car is compulsorily made from renewable resources. You car will cost about 4% more because of this intervention. But the next car will actually cost less than in the case of no intervention.

          • Rob G 5 years ago

            Sorry I don’t agree and here’s why. The sole reason the RET exists is to trigger a transformation from old energies to new energies, while also dealing with climate change.

            Sure in that process the government ‘appears’ to favour the renewables by providing financial assurance to them (That appears the basis of your argument) – but let us not forget the fossil fuel power generators have had a lot of tax payers money pumped into them for many decades. We basically built their infrastructure. Today, coal and gas still receive huge subsidies.

            When the subsides are removed coal and gas are just not financially viable next to the cost of renewables. Theirs is a protected industry and with this government bearing down on renewables – putting road block after road block in their way they are continuing to give all coal/gas a free hand in the market.

            What worries this government is that solar and wind continue to drop in price to the point that even against subsidised coal they are starting to come out cheaper. You only need to look at Queensland rooftop solar (1 in 4 homes have it) to see how many are saving a lot on their own power bills. Remember utility sized renewables and even cheaper than rooftop solar.

            For me, the threatened removal of the RET gives consumers less choice. They can only choose between gas or coal fire power. The RET provides more options for consumers (it opens the market up)

            Currently I buy 100% renewable energy at slightly less the cost of coal fire power – that seems like a pretty good reason to “buy their product”. I save a few dollars and I get clean energy.

            The RET invites a “Come one, come all” approach to the energy market, opening the doors for choice. Abbott wants to close those doors because it’s hurting coal/gas (his choice not mine).
            As you can see I see no reason to agree with “The whole point of the RET is to NOT allow consumers to choose from fair market competition”

  2. Paul McArdle 5 years ago

    Hi Dylan

    Have just noticed this now. Interesting that you should bring up Reserve Plant Margin (RPM) in its traditional context – i.e. Surplus of Installed Capacity over Peak Demand.

    When we put NEM-Watch together >10 years ago, we pulled the same metric into the real-time domain, to give a clear (non-price) indicator of the balance between supply and demand – hence Surplus Available (Scheduled) Capacity over Scheduled Demand = Instantaneous Reserve Plant Margin (IRPM).

    See in the attached image how it was sitting at 45% of spare capacity in the NEM (or just over 10,000MW sitting there available but doing nothing – note, for those who might get confused, the majority of this is NOT actively spinning at present).

    It is a very powerful indicator that conveys a number of different things simultaneously.

    Just like in a (static) installed sense, the smaller the IRPM percentage, the tighter the supply/demand balance. Here’s some historical context to what happens when it gets very low (and prices spike sky-high):


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