A reader’s guide to my submission to the Parliamentary Inquiry into AI
Data Centres in Tasmania
My submission to the
Parliamentary Inquiry into AI data centres has now been published on the
Committee’s website HERE .
At nine chapters plus an
appendix, the full submission is necessarily detailed. This post provides a
more accessible guide to the argument. It reproduces the substance of the
Executive Summary and then gives a short explanation of what each chapter examines
and why it matters.
The submission is not an
argument that Tasmania should reject data centres.
It asks a different question:
If very large data centres are to consume a substantial share of Tasmania’s electricity capability, how do we know that represents the best long-term use of a finite public resource?
Executive Summary
Tasmania is being asked to
accommodate data centres with electricity requirements on a scale the State has
never previously contemplated.
The immediate question is
whether Tasmania can supply them.
This submission argues that
there is a more important question:
Should Tasmania allocate a
substantial share of its finite firm electricity capability to data centres,
and what other opportunities or protections would be given up in doing so?
The public discussion often
begins with Tasmania’s abundance of renewable energy. But renewable energy is
not the resource in shortest supply.
Tasmania’s strategic
advantage lies in Hydro Tasmania’s stored water and the flexibility it
provides: the capacity to generate when electricity is most needed, firm
intermittent wind and solar, manage drought, support existing industry,
maintain system reliability and take advantage of valuable market
opportunities.
The scarce resource is not
renewable generation. It is stored energy, firming capability and dispatch
flexibility.
Hydro is not an unlimited battery
Hydro Tasmania operates
approximately 2,400 MW of generation across a diverse hydro system. That
headline number can create a misleading impression of enormous spare capacity.
Different parts of the
system have very different storage characteristics. Much of its generating
capacity has limited storage behind it, while the most valuable long-duration
flexibility is concentrated in the deep storages.
Water availability also
varies substantially between years. Hydro’s water must support not only
electricity generation but other demands and constraints, including irrigation
and environmental requirements.
The relevant question is
therefore not whether Hydro can generate another 500 MW at a particular moment.
It is whether Tasmania can
support hundreds of megawatts of additional continuous demand through low-wind
periods, dry years and system contingencies without compromising storage
security, existing industry, consumers and other future uses of this finite
resource.
Hydro’s profitability matters to every Tasmanian
Hydro’s commercial
performance is also important beyond the electricity system.
The State’s fiscal strategy
increasingly depends upon significantly higher returns from its State-owned
businesses, particularly Hydro. Hydro profits flow back to the State through
tax-equivalent payments and dividends.
That produces another
important distinction.
A wind farm can be
constructed without necessarily increasing Hydro’s profitability. An
interconnector can be financed without necessarily increasing Hydro’s
profitability. A data centre can be connected without necessarily making Hydro
or Tasmania financially better off.
Infrastructure being built,
infrastructure being financed and Hydro earning higher profits are three
different propositions.
That distinction matters
when assessing data centres.
What would another 500 MW actually mean?
The submission uses a
hypothetical additional 500 MW continuous load to illustrate the scale
of the issue.
Such a load would consume
approximately 4,380 GWh each year.
If the equivalent annual
energy were supplied by wind operating at an average capacity factor of around
35%, approximately 1,500 MW of installed wind capacity would be
required.
But producing the same
amount of energy over a year does not make a 500 MW data centre firm.
There will be periods when
wind generates considerably more than the data centre requires and periods when
it produces considerably less. The electricity system must manage both
conditions.
The submission therefore
considers three different consequences.
1. Direct Supply Impacts
Someone must finance and
build the additional renewable generation, transmission and other
infrastructure required to support the load.
Someone must carry the
associated commercial risks.
These costs do not disappear
simply because contractual arrangements allocate them between different
parties.
2. Market and System Interaction Impacts
When large quantities of new
wind are producing, they interact with Hydro’s existing generation.
That may affect Hydro
dispatch, exports, storage decisions, electricity prices and arbitrage
opportunities.
The important question is
therefore not merely whether a renewable project is commercially viable in
isolation, but what its introduction does to the value and profitability of the
existing Hydro portfolio.
3. Firming and Reliability Impacts
When renewable output falls,
the data centre still requires electricity unless its demand can genuinely be
curtailed.
Firm supply must then come
from Hydro storage, imports, storage technologies, demand response or some
combination of them.
The amount of genuine and
contractually enforceable demand flexibility therefore matters enormously. A
data centre capable of materially reducing load during energy stress creates a
different problem from one requiring uninterrupted supply.
The Hydro paradox
This creates an important
paradox.
As more intermittent
renewable generation enters Tasmania’s electricity system, Hydro’s ability to
store energy and generate on demand may become more valuable to the
operation of the system.
But greater importance does
not necessarily mean greater profitability.
When renewable generation is
abundant, Hydro may face reduced dispatch and different market opportunities.
When renewable generation is scarce, Hydro’s stored energy and flexibility
become increasingly important for firming.
The final commercial outcome
will depend upon contract design, renewable supply, demand flexibility,
hydrology, market conditions and how risks are allocated.
That is precisely why the
consequences should be modelled rather than assumed.
The opportunity-cost question
Every significant allocation
of firm electricity capability also has an opportunity cost.
Capability committed to one
use cannot simultaneously support:
- existing major industries;
- future minerals processing or
manufacturing;
- electrification;
- valuable export opportunities;
- drought resilience; or
- industries and technologies that have not
yet emerged.
This does not mean that data
centres are necessarily a poor use of electricity.
It means they should have to
demonstrate that the public value they create justifies the scarce capability
they consume.
Who makes that decision?
This leads to the governance
problem at the heart of the submission.
Different institutions
assess different pieces of the puzzle. Commercial arrangements, network
requirements, planning impacts and environmental consequences are considered
through different processes.
But who asks the overarching
question:
Does allocating a
substantial quantity of Tasmania’s scarce firm electricity capability to this
particular development represent its highest-value long-term use?
The submission argues that
Tasmania needs a transparent whole-of-State resource-allocation framework
capable of assessing the cumulative consequences of major new electricity
loads, including:
- energy and firming requirements;
- genuine demand flexibility;
- transmission and infrastructure costs;
- Hydro profitability and State revenue;
- impacts on existing consumers;
- drought and energy-security risks;
- opportunity costs; and
- alternative future uses of the same
scarce capability.
The central proposition
The submission does not
argue that Tasmania should close the door on data centres.
It argues that technical
feasibility is not enough.
The appropriate test is not
merely:
Can Tasmania supply the
electricity?
It is:
What scarce firm capability
will this development consume, what risks and costs will it create, what
alternatives will be foreclosed, and will the resulting benefits leave Tasmania
better off over the long term?
That is ultimately the
public-interest question the submission asks the Committee to confront.
The Nine Chapters
Chapter 1: The Public Resource the Committee Is Being Asked to Protect
Tasmania’s electricity
debate is often framed around how much renewable generation can be built. This
chapter argues that this misses the real constraint. Tasmania’s scarce public
resource is its firm renewable capability, principally the stored
energy, firming capacity and dispatch flexibility provided by the hydro system.
Those capabilities support energy security, existing industry, future
development, drought resilience, exports and State revenue. Once committed to one
use, they cannot simultaneously be used for another. The central question is
therefore not simply whether data centres can be supplied, but whether
allocating this finite capability to them represents its highest-value use for
Tasmania.
Takeaway: Tasmania must decide how best to allocate
scarce firm energy, not merely how to generate more electricity.
Chapter 2: Understanding Hydro Tasmania’s Existing System
Tasmania’s hydro system is
sometimes described as one enormous battery. That is misleading. Its roughly
2,400 MW of installed capacity is spread across around 30 power stations with
very different storage and operating characteristics. A substantial proportion
has limited storage, while the greatest flexibility is concentrated in the deep
storages. Installed capacity can also be unavailable through maintenance and
outages. Most importantly, stored water is finite and subject to variable
inflows and competing demands, including irrigation and environmental
requirements. The real constraint is therefore not nameplate generating
capacity but stored energy, firming capability, dispatch flexibility and
drought resilience.
Takeaway: 2,400 MW of installed hydro capacity does not
mean 2,400 MW of continuously available firming.
Chapter 3: Why Hydro Tasmania’s Profitability Matters
Hydro’s profitability is not
simply a matter for the company. It has become increasingly important to
Tasmania’s fiscal strategy. Higher Hydro profits flow back to Government
through tax-equivalent payments and dividends, making Hydro’s future earning capacity
directly relevant to the State Budget. This chapter also challenges an
important assumption running through Tasmania’s energy debate: building
infrastructure does not automatically create Hydro profits. A wind farm can
be built, an interconnector financed and a data centre connected without
necessarily improving Hydro’s commercial position. The important question is
whether new arrangements preserve or diminish the flexibility, storage value
and market opportunities on which Hydro’s future earnings depend.
Takeaway: More energy investment does not automatically
mean more Hydro profit or more revenue for Tasmania.
Chapter 4: Hydro’s Dilemma Is Not Theoretical
Tasmania already has
experience of major electricity decisions producing consequences different from
those originally anticipated. Basslink provides the historical warning. Marinus
raises the question of whether assumptions developed around renewable exports
and increased interconnection remain appropriate if Tasmania instead attracts
very large new domestic loads. Bell Bay provides the contemporary warning: even
one major continuous industrial load can create difficult tensions between
customer affordability, Hydro’s commercial interests and broader State
objectives. These examples demonstrate the importance of distinguishing between
a project proceeding, a project being financed and the project ultimately
creating public value.
Takeaway: Tasmania should test optimistic assumptions
before committing another large share of its electricity system.
Chapter 5: Testing the Government’s Assumptions
The Government’s Statement
of Expectations contains sensible objectives: new generation should accompany
new demand, Hydro firming should occur commercially, energy security should be
protected and existing customers should not be disadvantaged. The difficulty is
whether all these objectives can be achieved simultaneously. Firming consumes
stored energy and flexibility. New renewable generation requires investment and
transmission. New network infrastructure has long-term costs. And allowing
demand to grow faster than supporting supply creates additional risks. This
chapter therefore treats the Statement not as a conclusion, but as a series of
propositions requiring evidence. The crucial distinction is between stating
protections and demonstrating mechanisms capable of delivering them.
Takeaway: Good intentions are not enough. The
Government’s assumptions need to survive contact with the physics and economics
of the electricity system.
Chapter 6: What an Additional 500 MW of Continuous Load Actually Means
This chapter puts numbers
around the problem. A 500 MW continuous load consumes about 4,380 GWh
annually and, if supported by wind averaging around a 35% capacity factor,
requires roughly 1,500 MW of installed wind generation to produce
equivalent average energy. That is before solving the problem of periods when
the wind is not producing. The chapter examines sequencing risk, impacts on
households and businesses, renewable economics and alternative combinations of
local generation and imports. It then separates the consequences into three
categories: Direct Supply Impacts, Market and System Interaction Impacts,
and Firming and Reliability Impacts.
Takeaway: A 500 MW data centre is not a 500 MW
renewable-energy problem. It is an energy, firming, transmission and
risk-allocation problem.
Chapter 7: Hydro’s Structural Dilemma
Adding large quantities of
intermittent renewable generation creates a paradox for Hydro. When wind
generation is abundant, it can displace Hydro generation and affect dispatch
opportunities, exports, price formation and arbitrage. When wind generation is
scarce, the continuous load remains and Hydro may be called upon to provide
firming from its stored energy. Hydro’s flexibility can therefore become more
important to the electricity system while simultaneously coming under greater
commercial pressure. This does not prove that every data-centre contract
will reduce Hydro’s profitability. It demonstrates why the effects must be
assessed across Hydro’s entire portfolio rather than judged solely by the price
written into an individual contract.
Takeaway: Being increasingly essential to the system
does not necessarily make Hydro increasingly profitable.
Chapter 8: The Governance Gap
Tasmania’s institutions
assess different parts of major developments. Planning authorities consider
development impacts, TasNetworks considers network requirements and Hydro
assesses commercial arrangements. Each may perform its individual role
correctly while nobody answers the larger question: is this the best use of
Tasmania’s scarce firm electricity capability? Every major allocation has
an opportunity cost. Firming committed to a data centre cannot simultaneously
support existing industry, future manufacturing, electrification, valuable
exports or additional drought resilience. This chapter argues for a transparent
whole-of-State resource-allocation framework capable of comparing those
alternatives and measuring their cumulative consequences before major
commitments become effectively irreversible.
Takeaway: The missing decision-maker is the one
responsible for asking what produces the greatest long-term value for Tasmania.
Chapter 9: Conclusions and the Public-Interest Test
The submission does not
argue that data centres should never be developed in Tasmania. It argues that
developments of this scale should have to demonstrate that their benefits
justify the public resources they consume and the risks they create. Assessment
should extend beyond investment dollars, construction jobs and electricity
contracts to include firming capability, Hydro profitability, State revenue,
household and business costs, transmission investment, energy security, drought
resilience, opportunity costs and future industrial options. The appropriate
test is not simply “Can Tasmania supply this project?” It is “Does
supplying this project represent a better long-term use of Tasmania’s scarce
electricity resources than the realistic alternatives?”
Takeaway: Technical feasibility is not the same thing
as public value.
The Myth-Buster Appendix
The submission concludes with a Myth-buster appendix examining claims commonly made in public discussion of data-centre development. I'll post this as a separate blog,
A final thought
The data-centre debate may
ultimately be about something much bigger than data centres.
As increasing amounts of
intermittent renewable generation enter the system, Tasmania’s most
strategically valuable electricity asset may increasingly become the ability
to decide when stored energy is used.
That flexibility supports
households, existing industry, new industries, exports, drought resilience,
energy security and the State Budget.
Data centres become another
claimant on that resource.
So perhaps the most
important question arising from the Parliamentary Inquiry is not:
Do we want data centres?
It is:
How should Tasmania allocate
an increasingly valuable, but finite, strategic resource, and who should make
that decision?
That is the question I have
tried to address in my submission.
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