Could Aussie airports help in the fight against greenhouse gas emissions?

A NEW study has found Australia’s government-owned airports could produce enough electricity to power 136,000 homes – or a regional city – if large-scale rooftop solar systems were installed.

focused young professional engineer installing solar panel
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Researchers at RMIT University compared electricity generated by residential solar panels in a regional city to the potential green energy production of 21 leased federal airports.

They found that if large-scale solar panels were installed at the airports, they would generate 10 times more electricity than the city’s 17,000 residential panels, while offsetting 151.6 kilotons on greenhouse gasses annually.

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Dr Chayn Sun said the analysis showed the value of focusing on renewable energy efforts on large centralised rooftop systems.

Dr Sun said installing large panels at locations like airports would help get Australia closer to a zero-emission economy.

“We hope our results will help guide energy policy, while informing future research in solar deployment for large buildings. There’s so much potential to facilitate national economic development while contributing towards greenhouse gas emission reduction targets,” she said.

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Dr Sun, a geospatial scientist in RMIT’s School of Science, said airports were ideal for solar panels but were not currently being used to their full potential – many Australian airports are without adequate solar systems.

“Airports get good sun exposure because they’re not shaded by tall buildings or trees, making them a perfect spot to harness the sun’s energy,” she said.

She said harnessing the potential of large-scale solar panels at federal airports would help avoid 63 kilotons of coal being burned in Australia each year.

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For the study, published in The Journal of Building Engineering, geospatial researchers estimated the solar electricity generated from 17,000 residential solar panels in Bendigo, Victoria, over one year.

Lead author Athenee Teofilo, a Master of Geospatial Science student, then mapped the buildings in every leased federal airport – excluding unsuitable structures like dome and blister-type hangars – and identified 2.61km2 of usable rooftop space.

Researchers determined the optimum tilt angle for the solar arrays for each airport, to maximise efficiency.

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Perth Airport had most energy-generating potential; placing solar panels there could produce almost twice the solar output of Bendigo, equal to the combined production from Adelaide, Sydney, Moorabbin and Townsville airports.

Airport buildings less suited to solar panels, like those at Alice Springs and Tennant Creek, could still be useful for ground-mounted solar systems, the study found.

Dr Sun said the research underlined the necessity for energy policies to include a plan for installing solar panels at airports.

“Based on our solar radiation analysis, we know airports with decent solar systems could not only be self-sufficient but would generate enough electricity to send the excess back into the grid,” she said.

“We mapped airports owned by the federal government, but Australia has more than 150 privately-owned airfields, which could also have panels installed.”

R Sun said reflections from the panels would not be a problem, as modern solar arrays absorb rather than reflect sunlight.

The findings could also be extended to assess the solar potential of other sites, such as large commercial buildings, warehouses or distribution centres.

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