Who is making sure it all adds up?
For decades, Tasmania’s government businesses were regarded as assets of the State. They provided essential services, funded their operations and returned dividends to help pay for health, education, public safety and other essential services.
Increasingly, we must ask whether that model is being reversed. Instead of supporting the Budget, will some of our largest government businesses increasingly need the Budget to support them?
But this is now beyond a story of mismanagement. Infrastructure is ageing and replacement costs have risen sharply. Borrowing is more expensive. The energy transition requires new generation, transmission and ways of operating. All require capital at a time when the State’s finances are constrained.
The old arrangement was straightforward: public capital built productive assets, those assets generated profits, and profits flowed back to the Budget. The emerging pattern looks different: large renewal and expansion programs, higher debt and interest costs, weaker dividends and, in some cases, further taxpayer equity.
TT-Line is the warning. Its vessel replacement program has cost at least $717 million more than originally forecast, while the Government has announced a $506 million equity injection. TASCORP told the Public Accounts Committee that debt is not expected to be cleared until 2052.
When assumptions fail, Tasmanians can spend decades paying for the consequences.
The question is therefore shifting from “how much will our government businesses return?” to “how much capital will government have to put into them?”
Electricity is the next, and much bigger, test.
Consider Marinus Link. Stage 1 reached Final Investment Decision in August 2025. The Whole-of-State Business Case underpinning consideration of the project was explicitly described by Treasury as a “point in time” document, with modelling inputs finalised by December 2024. The publicly released report also contained substantial redactions.
Barely a year later, the strategic landscape looks strikingly different. Tasmania is now engaged in a vigorous debate about large new on-island electricity loads from data centres and AI factories. We have been made aware of six recently revealed confidential proposals that would require at least 500 MW, in addition to three Firmus projects with combined requirements of at least 444 MW.
That does not necessarily make data centres/AI factories and Marinus incompatible. But it does illustrate how rapidly the assumptions shaping Tasmania’s electricity future can change.
If those assumptions change, where is the updated analysis showing how the pieces still fit together?
Tasmania is simultaneously confronting how much new generation it needs, how much transmission to build, how much power to trade across Bass Strait, on what terms major existing industries are supplied, and how much new electricity demand we should encourage.
These cannot be treated as separate questions.
Every large new load affects the generation we need. New generation can require new transmission. Transmission requires capital and somebody ultimately pays for it. Interconnection changes how the system operates. Arrangements with major industrial users affect returns. And Hydro Tasmania’s capacity to firm the system affects how much intermittent generation it can reliably support.
They are different parts of the same electricity system and, ultimately, the same State balance sheet.
Yet much of the debate still concentrates on individual projects and installed generation capacity. Less attention is paid to a more fundamental question: how much dependable energy can Tasmania actually provide, at what times, at what cost and under what hydrological conditions?
This is where Hydro faces a genuine dilemma. Hydro Tasmania’s flexibility becomes increasingly valuable as more wind enters the system. But more wind can also reduce Hydro’s generation opportunities and increase its firming role. The value of Hydro to the electricity system and the profitability of Hydro are not necessarily the same thing.
Nor is Hydro’s firming capability unlimited. It operates with finite water, finite storage and real physical constraints. The loss of Tungatinah Power Station to fire on 2 September, with gas-fired Tamar Valley power station brought back to help cover the gap at additional cost to Hydro, is a reminder that the system’s margins are real.
Before Tasmania signs another major energy, infrastructure or government-business deal, therefore, we need more than an individual business case. We need to see the whole picture.
What capital will our government businesses require over the next decade? How much debt can they prudently carry? What dividends can realistically be expected? What electricity demand are we planning for? What generation is reasonably firm given variable inflows rather than merely installed? What transmission will that require? And who ultimately bears the cost?
There is no shortage of individual plans and business cases. What is missing from public view is the reconciliation between them.
TT-Line demonstrated that a project can look manageable until, among other challenges, its assumptions prove wrong. Marinus Link demonstrates something equally important – the environment in which a generational investment decision is made can change remarkably quickly.
Annual reports tell us how yesterday’s decisions turned out. The next month will reveal how our government businesses are faring, by necessity a rear-view mirror snapshot.
However the question Tasmania needs answered now is prospective: Who is responsible for ensuring that all these commitments, taken together, are technically achievable, financially sustainable and in Tasmania’s long-term interest?
Before making tomorrow’s decisions, Tasmanians are entitled to see not merely the business case for each dot, but the plan that joins them together.
The Mercury, Tuesday 6 October 2026