The ranking is based on 17 sustainable development goals and outcomes determined by the United Nations and is judged by the Times Higher Education independent board.

Objectives include the university's output of research, internal management, and engagement with the wider community.

"We submitted against and scored against 13 of the 17 goals," said the university sustainability manager Ed Maher.

This year, 1100 institutes submitted in the awards.

"It recognises that we have continued to address long-term objectives with things like the commissioning of new solar ventures on campus," Mr Maher said.

It follows the university's high commended prize in last year's International Green Gowns Award and the release of the 2021-2022 Centre for World University Rankings report which lists CSU as 1091st in the world for overall achievement.

By comparison, the University of Melbourne ranked the highest in Australia at 63rd and the University of Sydney ranked at 98th in the world.

"Charles Sturt University's performance in the Centre for World University Rankings is another pleasing indication of our teaching and research strengths," a spokesperson for the university said.

"To be ranked just outside the top 10 per cent of nearly 20,000 universities in the world is a great result. This result is underpinned by quality education, impactful research outcomes, and the ongoing success of our graduates."

At the moment, across its footprint, the university is aiming to implement 100 per cent renewable energy sourcing.

Up to 20 per cent - or 4.7 megawatts - of the university's energy needs is now supplied by its own solar generation.

"We have about 14,500 solar panels now installed across our buildings," Mr Maher said.

"We're moving away from natural gas at the moment and using more electricity from renewable sources instead of fossil fuels."

At the Wagga campus, the university has also begun water conservation trials by reducing conventionally irrigated turf and re-introducing native vegetation which requires little water once established.

"A couple thousand native seedlings will be planted this week," Mr Maher said.

"[In a couple of years] we'd expect to roll out the same program on other campuses."

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