Tasmanian households and small businesses could eventually face higher electricity bills following the closure of a major smelter and uncertainty over the state’s biggest power user. The concern is not an immediate power shortage, but the loss of millions of dollars in network charges paid by large industrial customers.
Liberty Bell Bay’s manganese smelter is closing after administrators failed to secure a buyer. Meanwhile, Rio Tinto and Hydro Tasmania are negotiating a new electricity agreement for Bell Bay Aluminium, which consumes about one-quarter of Tasmania’s power.
Why household power bills could rise
TasNetworks collects regulated revenue to operate and maintain Tasmania’s transmission system. Major industrial facilities contribute a substantial share because of their high electricity use.
If one of these businesses closes, TasNetworks may be permitted to recover some lost revenue from remaining customers. Energy analyst Marc White estimated that Liberty Bell Bay previously paid about $8 million annually in network charges. Spreading that amount across other users could represent approximately 0.6 per cent of an average power bill.
TasNetworks interim chief executive Renee Anderson said the actual contribution was more modest. The company has absorbed the loss this financial year but has not decided how it will respond in future years.
Bell Bay Aluminium presents a bigger risk
Bell Bay Aluminium uses approximately 355 megawatts, equal to about 25 per cent of Tasmania’s electricity. Liberty Bell Bay used around 90MW, or roughly 7 per cent.
White estimated that Bell Bay Aluminium pays about $25 million annually in network charges. If the facility closes and the full shortfall is recovered from other users, it could create pressure equivalent to a further 2 per cent bill increase.
These figures are analyst estimates, not confirmed price rises. Any change would depend on regulatory decisions, TasNetworks’ response and whether replacement customers are found.
Rio Tinto reportedly wants a new power agreement settled by the end of August. Its current extension expires in December 2026 after the parties failed to reach a longer-term deal last year.
Discounted electricity and regional jobs
Tasmanian Industry Minister Felix Ellis said major industrial facilities pay about one-quarter of the electricity price charged to households and half the rate offered to mainland smelters.
White estimated Liberty Bell Bay spent around $40 million annually on energy, while Bell Bay Aluminium may pay about $100 million. Hydro Tasmania says its current offer is as low as it can go without becoming commercially unsustainable. The state government has instead sought federal Green Aluminium Production Credit support for the facility.
Bell Bay Aluminium employs more than 500 people and approximately 120 contractors. It is estimated to support nearly 1,000 additional jobs and contribute more than $500 million to Tasmania’s economy.
A shutdown would follow more than 200 job losses after Australia’s only manganese smelter closed when its rescue deal collapsed. Northern Tasmania is experiencing another setback, with James Boag moving brewing production to mainland Australia.
Grid stability may require investment
Major industries also help balance Tasmania’s electricity system. Bell Bay Aluminium, Liberty Bell Bay, Boyer Paper Mill and the Nyrstar zinc smelter participate in a System Protection Scheme, adjusting their consumption when required.
TasNetworks says Liberty Bell Bay’s closure will not affect the scheme, but it would be reviewed if Bell Bay Aluminium shuts. White suggested losing that flexible industrial load could contribute to a possible $120 million upgrade at the George Town substation. TasNetworks has not confirmed that a closure alone would trigger the project.
Spare power could become more valuable
There is a potential benefit for Hydro Tasmania. Electricity previously sold to major industries at discounted rates could be offered elsewhere for two to three times as much through new contracts and wholesale-market trading.
The $5 billion Marinus Link between Tasmania and Victoria is expected to more than double the state’s capacity to trade electricity with the mainland. Data centres could provide replacement demand. Firmus Technologies is building a 100MW facility at St Leonards and has two more projects planned, although it says it receives no power discount.
The official Liberty Bell Bay closure statement confirms that no buyer was secured despite government assistance and an expedited sale process.
What happens next
Economist and former Hydro Tasmania board member Saul Eslake argues that industrial electricity prices should be disclosed so the public can judge whether discounts are justified by employment and economic benefits.
Households do not face an automatic increase. The key developments will be the Bell Bay Aluminium negotiations, TasNetworks’ treatment of lost revenue and any infrastructure proposal submitted through the regulatory process.
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