Industry Super Australia recently published a discussion paper, Modernising Electricity Sectors – A guide to long-run investment decisions (the ISA Report).[i] Controversially it proposed investigating nuclear power to replace retiring coal plant. What’s the report about, and do its findings stack up? We take a look.
Written by two economists, the paper deals with the uncertainties facing the Australian electricity sector, in the face of increasing urgency to reduce emissions. It characterises the two scenarios available to investors as:
It then goes on to make a number of recommendations to facilitate the long-term solutions, including:
The goal of the paper is zero emissions electricity, with consideration of the security and reliability of supply, given the inherently variable nature of renewable energy’s fuel sources.
To determine the different technologies’ costs, the paper considers:
The paper uses three different sources for LCOE costs, being Lazard,[iii] OECD,[iv] and the Energy Information Reform Project.[v] While these are useful sources for US data, it would have been more appropriate to use Australian data, as published by the CSIRO in its GenCost 2018 Report.[vi]
An example is the use of nuclear capital costs. Here is the chart from the Energy Information Reform Project, which reports average costs of US$3,782/kW (about A$5,400/kW):
Source: Energy Information Reform Project, Figure 4, p.10
In contrast, here is a CSIRO graph showing prices of about A$10,000/kW for large-scale nuclear, and A$16,000/kW for small-scale nuclear:
Source: CSIRO, Figure 3-9, p.16
While the figures are not directly comparable, it is clear that the Australian figures are significantly different from the US sources cited, this then puts much of the subsequent analysis into conflict with conventional Australian analyses that conclude that nuclear is an economically unrealistic technology.
Capacities and costs
The ISA Report is quite rightly concerned about the “Duck Curve”. Again, not needing to refer to US sources, AEMO’s QED Report provides a good example of what is already occurring in Australia.[vii]
Source: AEMO, Figure 10, p.11
This shows that due to the penetration of domestic solar, grid demand during the day is declining markedly. Thus, we need plant that is responsive to short-term variations, but is also dependable over the longer-term. The following table from the International Energy Agency sets it out well.[viii]
Source: OECD/IEA, Table 2.1, p.19
The ISA Report speculates that, “It is not clear how much back-up is needed. This will depend on the technology mix. If we had a complete solar and wind system, one-and-a-half days would seem reasonable, although this would probably not guarantee total reliability. One day would seem too low.”
A quick review of available wind data suggests this is simplistic and inappropriate. See for example the following graph showing ten days in June last year.
Source: AEC analysis of NEM data
In this circumstance 1½ days of backup would be inadequate unless there were significant over-build to ensure demand was met.
The solution is to include a range of technologies with different characteristics to support the increasing variability of demand. For example, batteries can provide very fast response but for limited duration, whereas closed-cycle gas turbines are slower to come online, but, subject to fuel availability, can generate for longer.
These technologies don’t need to be standalone either. They can work in concert with variable renewable energy to “firm” its supply, whether that be on a physical basis,[ix] or a contractual basis.[x] In addition, the recently legislated Retailer Reliability Obligation will compel retailers to firm their supplies when there is a forecast shortfall.[xi]
The authors propose that nuclear power may be an option to provide that flexibility, however existing plants are notoriously inflexible and incapable at this role. There are proposals for more flexible plants in the future, but there is uncertainty whether it can be ramped up and down to the extent and in the required timeframes so match renewable energy fluctuations. See, for example, the paper Can Reactors React? – Is a decarbonized electricity system with a mix of fluctuating renewables and nuclear reasonable?[xii] This is further considered in the most recent IEA Report, “… nuclear power plants can be operated in a flexible manner, although this may require minor changes in plant design.”[xiii],[xiv]
In any case, the avoided marginal costs of reducing output of a nuclear plant would appear to be near zero and possibly negative – it may even be cheaper and simpler to spill renewables than ramp nuclear. The more conventional approach to “firm” the supply of renewables is to use low capital cost/high marginal cost/highly flexible plants, such as gas or liquid-fired peaking plant.
How do we encourage these solutions?
The ISA Report lists ten policy suggestions. We will concentrate on four of the most relevant ones.
The report proposes that policies should be neutral to technology and market structures. It suggests that markets require more competition, alleging that there is gaming of price setting procedures in the NEM. This has previously been refuted by the Australian Energy Regulator (AER) in its NSW Electricity Market Advice[xv] and Hazelwood Advice.[xvi]
It then goes on to suggest establishment of an expert panel to provide technical guidance to government on issues related to technology, as well as suggesting that to provide “technological choice”, capacity to build or operate a nuclear facility should be fostered.
However there already exists the Office of the Chief Scientist, currently filled by Alan Finkel AO, who provides advice to Government on such matters, including by means of the National Science and Technology Council. We also have the CSIRO itself and many energy market institutions, such as the recently created Energy Security Board.
Long-term Market Architecture
The authors suggest that the NEM should be focused on the longer term by having auctions of longer-term contracts of 20 years’ duration or longer written by the government.
In response to this, the AEC suggests this is effectively a reversal into government-managed electricity systems that was abandoned in the 1990s due to the waste and inefficiency that such a model created.[xvii] In the existing liberalised electricity market, there are already such long-term arrangements in place via power purchase agreements, where risks are borne by investors rather than customers, for example in over-estimating demand growth as occurred in many government owned electricity utilities in the 1980’s. These risks continue, and are evident in the following graph:
Source: AEMO, 2018 Electricity Statement of Opportunities, August 2018, Figure 41, p.81
Governments to formally underwrite markets[xviii]
The ISA Report suggests that Government may eventually have to act as underwriter of last resort in Australia’s electricity markets, if all other proposals fail to reduce emissions.
As the AEC submitted to the Underwriting New Generation Investments Public Consultation Paper,[xix] the AEC is of the firm opinion that government intervention in the investment process distorts the wholesale electricity market and would only be driven by a continued absence of consistent government policy, as has occurred over the past decade. In summary, the AEC opposed the UNGI Programme on the basis of:
Public Authority for Transmission and Distribution Planning
The ISA Report observes that distribution and transmission networks are natural monopolies that require planning decisions in the public interest. It suggests that AEMO could be strengthened to perform this planning role.
However AEMO already conducts a considerable amount of such planning, in the form of the NEM Electricity Statement of Opportunities,[xx] Integrated System Plan[xxi] and the Energy Adequacy Assessment Projection.[xxii] When these businesses are regulated, the AER reviews their spending plans against these documents. Distribution businesses also conduct similar studies that are subject to the AER’s review.[xxiii]
The ISA Report offers an interesting perspective from those outside the industry. Although its authors were consciously seeking to challenge existing thinking, a proportion of its discussion and conclusions could have been significantly improved by a little more research, and consultation with those who are more familiar with industry’s workings. One thing upon which we can all agree is the need for government policy certainty. However the AEC would consider direct government involvement in the market as the antithesis of certainty.
[ii] The “energy security costs” listed include “back-up against failure of generation to meet demand over a longer period”. This should more properly be characterised as reliability costs.
[iii] Lazard, Lazard’s Levelized Cost of Energy Analysis – Version 12.0, 2018
[iv] Not cited
[v] Energy Innovation Reform Project, What will advanced nuclear power plants cost? A Standardized Cost Analysis of Advanced Nuclear Technologies in Commercial Development, undated but assumed to be 2018
[vi] Graham, P.W., Hayward, J., Foster, J., Story, O. and Havas, L., GenCost 2018, December 2018.
[vii] AEMO, Quarterly Energy Dynamics Q1 2019, 7th May 2019
[viii] International Energy Agency, Status of Power System Transformation 2018 – Advanced Power Plant Flexibility, May 2018
[xi] The draft rules for which are available at http://www.coagenergycouncil.gov.au/publications/retailer-reliability-obligation-rules
[xii] Craig Morris, Can Reactors React? – Is a decarbonized electricity system with a mix of fluctuating renewables and nuclear reasonable?, Institute for Advanced Sustainability Studies, January 2018
[xiii] International Energy Agency, Nuclear Power in a Clean Energy System, May 2019, p.14
[xiv] ibid., p.72ff
[xv] AER, AER Electricity Wholesale Performance Monitoring – NSW Electricity Market Advice, December 2017
[xvi] AER, AER Electricity Wholesale Performance Monitoring – Hazelwood Advice, March 2018
[xviii] We assume this is what’s meant by the authors saying that “governments may need to formerly underwrite markets”.
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