Australia waste-to-energy study finds emissions higher than grid coal
New research shows waste-to-energy in Australia emits more than the grid average, challenging its green credentials.
A study published on Wednesday (2026-05-27) found that waste-to-energy projects in Australia produce higher emissions than the current National Electricity Market average, undercutting the case that such facilities offer a cleaner alternative to landfill. Researchers said the gap is driven by the energy-intensive process of converting waste into electricity and the organic content of the waste stream itself — food and organic material that biodegrades in landfill produces methane when incinerated instead.2
Australia's major states have backed the technology, with New South Wales and Victoria issuing permits for multiple facilities. If the study's findings hold, those plants could lock in a generation source that is dirtier than the grid they supply — at exactly the moment the grid is decarbonising fastest.2
The grid has moved quickly. Wholesale power prices averaged A$50 per megawatt hour in the first quarter of 2026, a 44% reduction from 2024, according to the Australian Energy Market Operator, as surging renewable generation pushed the share of renewables past 50% of total supply in January (2026-01-28).1 A grid drawing more than half its power from wind and solar carries a far lower emissions intensity than one running on coal; waste-to-energy plants burn material at high temperatures in a process that cannot easily be decarbonised, meaning their emissions profile will worsen relative to the grid as more renewable capacity is added.2
The timing is awkward for developers on other fronts. Australia faces an accelerating retirement of coal plants, and the Australian Energy Market Operator has warned of potential supply shortfalls after 2025 as new renewables and storage struggle to keep pace with closures.6 At an energy conference in Tasmania on Friday (2026-06-05), developers of wind projects said costs are "getting worse, not better," with connection delays and a fickle off-take market blocking final investment decisions.4 Similar pressures are likely to weigh on waste-to-energy developers seeking project finance.
Demand is pulling sharply the other way. Data centres supporting AI and cloud services are projected to account for 29 TWh of electricity consumption, Fitch Ratings said on Monday (2026-06-01), while the Australian Energy Market Operator's Draft 2026 Integrated System Plan projects business and industrial consumption rising to 253 TWh by 2050 from 133 TWh as of June 2026 (2026-06-01).3 Origin Energy reported a 4% increase in electricity sales volumes during the March 2026 quarter compared with the same period the previous year, driven primarily by data centre demand.5
The question for regulators is whether waste-to-energy qualifies as clean energy in renewable energy certificate schemes. If the Clean Energy Regulator tightens standards to exclude facilities whose emissions exceed the grid average, the financial model for multiple proposed projects collapses. The study did not model that scenario, but the direction of policy risk is clear.2
One variable is waste composition. If Australia separates more organics and increases recycling rates before incineration, the emissions intensity of waste-to-energy could fall. Current waste streams in many states contain high proportions of food waste, which drives the carbon footprint up sharply.2
The core data point is arithmetical: the grid average emissions rate has already fallen below the projected waste-to-energy rate, and as Australia adds wind and solar, that gap widens further. State governments in New South Wales and Victoria face a choice between grandfathering existing permitted projects or adjusting renewable energy targets to exclude the technology — a decision that will directly reset project financing for facilities already in the permitting pipeline.2