Rahul Somvanshi
Data centres are often marketed as digital infrastructure for a lower-carbon economy, yet their reliability systems can still depend on diesel generators. A video circulating online has raised questions about NextDC’s diesel use during data-centre construction and commissioning in Australia, including whether fuel-tax credits could support that consumption.
The central environmental issue is real: before a data centre goes live, backup generators are tested under load to demonstrate that they can keep servers operating through a grid outage. Those tests can burn substantial diesel. The quantity, frequency and emissions depend on the number and capacity of generators, the testing schedule and whether lower-emissions alternatives are available.
What the company has said
NextDC has said that total diesel use can rise during periods of heavy commissioning as new projects are developed. It has also said that its focus is to reduce diesel use per unit of capacity through testing schedules and generator management. That is an operational-intensity claim, not a public disclosure of total litres used, generator-testing emissions or the local air-pollution burden at individual sites.
The video cites a campaign estimate that NextDC may have been eligible for more than A$1 million in fuel-tax credits in the 2025 financial year. That estimate needs underlying fuel volumes, credit rates and tax records to be independently confirmed. It should not be treated as a confirmed payment without those records.
Why do fuel-tax credits matter? Australia’s fuel-tax-credit system can refund or reduce fuel-tax costs for eligible business use. Eligibility and the amount depend on the activity, fuel type and applicable rules. A company’s potential eligibility does not itself establish the amount claimed or prove that any activity was unlawful.
The missing environmental data
For communities and investors to assess the impact, operators should publish generator runtime, diesel volumes, testing emissions, local pollutant controls and the measures used to reduce testing. Companies should also distinguish routine backup testing from construction and commissioning work, when fuel use may be higher.
The transition issue is not whether critical facilities need resilient power. It is whether reliability can be delivered with transparent limits on fossil-fuel use, cleaner backup technologies and credible disclosure. Until NextDC releases site-level diesel and emissions data, the video’s broad concern is valid but its specific fuel-credit figure remains an estimate rather than a verified company payment.
