Australian data center operator Nextdc moved to reassure investors on Wednesday, telling the ASX that its debt remains comfortably within the limits set by its lenders. The update comes as the company navigates a period of heavy expansion and uncertainty around power infrastructure at one of its key sites.
What the numbers show
Nextdc's announcement focused on its loan covenants — the financial guardrails lenders use to ensure a borrower stays healthy. As of June 30, the company said it had wide buffers. Its pro forma interest cover ratio, which measures earnings relative to interest costs, stood at 5.91 times against a minimum requirement of 1.5 times. Its gearing ratio, a measure of debt relative to equity, was 8.2% against a maximum of 60%.
The company also reported AU$8.68 billion in liquidity as of September 30, and said it expects to meet its liquidity requirements at the next test date on December 31.
On the surface, those figures suggest Nextdc has plenty of room to maneuver. But the company was careful to point out why covenant comfort doesn't automatically translate into spare debt capacity.
Why timing matters
Covenant math is sensitive to timing. If Nextdc draws down more debt, its interest costs rise immediately. But earnings can lag, because revenue only starts flowing once customers are installed and billing cycles begin. That mismatch can squeeze interest cover and liquidity measures even when leverage still looks low on paper.
There's another wrinkle in the pro forma numbers. Nextdc included 73 megawatts of contracted utilization signed in July, but excluded certain customer contracts at its M3 Melbourne site until uncertainty around grid power upgrades is resolved. Those upgrades are currently expected to be completed in fiscal 2028.
The decision to leave M3 contracts out of the calculations highlights a broader challenge for Australia's data center sector: power availability. As we've noted, Australia's data center boom could draw AU$260 billion, but power is the catch. Grid constraints are becoming a common theme across the industry, and Nextdc's caution reflects that reality.
What it means for investors
For credit investors, the key takeaway is that a single "as of" snapshot doesn't tell the whole story. Nextdc's buffers look large today, but the company's own disclosure highlights the pressure point: funding drawdowns can hit interest expense immediately, while revenue recognition depends on when customers start paying.
That means the cadence of debt usage and billing could matter more for near-term flexibility than the June 30 gearing number. The December 31 covenant test — and the decision to leave M3 Melbourne contracts out of the calculations until grid upgrades are clearer — is why the market may treat this update as a sign of current comfort, not a blank check for future borrowing.
For everyday investors, this is a reminder that even well-capitalized companies can face constraints when they're growing fast. Nextdc's expansion is tied to the broader AI data center boom, which is driving demand for computing power but also straining power grids and supply chains. The company's ability to deliver on its contracts will depend on infrastructure that is partly outside its control.
Nextdc's update is a positive sign for its financial health, but it also underscores the importance of watching how the company manages its growth. The next covenant test in December will be a key moment to see whether the buffers hold as spending continues.
