"Boral will reduce their carbon emissions by up to 150,000 tonnes a year. That's a lot of carbon that won't be going into our atmosphere," he said.

With the major employer secured into the future under Boral's revamp, he said the market would increasingly demand serious action on emissions.

Boral chief executive Vik Bansal said it marked an important milestone in the push for net-zero emissions, having already achieved 30 per cent coal substitution.

"From our Federal Highways to the Sydney Opera House and Parliament House in Canberra, for almost a century, the Berrima Cement Works have helped to build and shape Australia," Mr Bansal said.

Although cement was vital to construction it was carbon-intensive, and the technology would take operations into a new era - one with less impact on the planet, he said.

The upgrade will enable alternative fuel usage to reach 60 per cent over the next three years at the site.

Cement manufacturing is responsible for about eight per cent of the world's total carbon emissions, because most producers rely on burning fossil fuels at very high temperatures.

But the carbon-reducing technology known as the chlorine bypass is being used by Boral to reduce its use of emissions-intensive fuels during the cement-making process.

It significantly reduces the build-up of materials including chlorides, alkalis and sulphates, which is a by-product of alternative fuel use when producing clinker -  the backbone of cement.

Acquired by Seven Group in 2024, Boral operates nationwide in quarry products, cement, concrete, asphalt and recycled materials

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