中文A mill that wants to run on its own leftovers
Picture a paper mill the size of a small town, burning natural gas around the clock to cook limestone into the lime it needs for production. Now imagine powering that furnace instead with gas made from organic waste — the scraps and byproducts that would otherwise be thrown away. That is exactly the bet Opal Australia is now testing at its Maryvale Mill, and it is a genuinely clever idea.
Opal has just finished a feasibility study with Delorean Corp, an Australian bioenergy company. The study found it is possible to build a large-scale anaerobic digestion facility that takes organic residues — and potentially byproducts from paper manufacturing itself — and turns them into renewable bio-gas. That gas would replace the natural gas currently feeding the mill’s rotary lime kiln. It lines up neatly with Opal’s net-zero strategy.
The numbers behind the idea
Maryvale is no small operation. It produces between 550,000 and 600,000 tonnes of product a year, focused on brown packaging paper and board — unbleached kraft linerboard and fluting medium, the workhorse materials of corrugated boxes. This is the kind of plant where a small change in energy source ripples across a huge carbon footprint.
The next phase involves front-end engineering and design, regulatory approvals, and lining up the organic feedstock and residue off-take agreements. Subject to all that, the project is estimated to need around $35m for construction and design. That is real money, but for a facility this scale, it is a measured, targeted investment rather than a moonshot.
A second chance for a troubled site
There is history here worth remembering. Maryvale was once Australia’s largest producer of copy paper. That business shut down after a court ruled in favour of a possum in the forests where Maryvale sourced its logs. Yes, a possum. It is a reminder of how quickly the ground can shift under a paper maker, and why finding a “new energy future” is not a slogan here but a survival strategy.
Joseph Oliver, managing director of Delorean, called the study outcome “promising.” He added that if the engineering phase goes well, the same model could be rolled out at other Opal sites across Australia and New Zealand. That is the quietly exciting part: one successful plant could become a template.
Why the Latrobe Valley should care
David Jettner, Opal’s general manager for environment and sustainability, pointed out that the bio-gas project could bring “another new energy industry to the Latrobe Valley.” This is a region that has spent decades wondering what comes after coal. A paper mill that doubles as a bio-energy hub is not a complete answer, but it is the right kind of question.
“We are optimistic about the potential of bio-gas as a renewable alternative to gas,” Jettner said. When a sustainability lead at a major manufacturer sounds optimistic rather than defensive, it usually means the economics are starting to work, not just the optics.
The practical takeaway
For packaging buyers and printers, the lesson is simple: the carbon story of your boxes is increasingly written at the mill, not just at the converter. A kraft linerboard made with bio-gas carries a different footprint than one made with imported natural gas, and brand owners under Extended Producer Responsibility pressure will notice.
Opal still has hurdles — engineering sign-off, permits, and a stable supply of feedstock. But the direction is clear. The mill that lost its copy-paper business to a possum is now trying to power itself with its own waste. If that is not a second act worth watching, nothing is.
Source: Print21
