Introducing capacity overage: Flexibility when you need it most (Preview)
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Capacity overage, is a new opt‑in capability in Microsoft Fabric designed to help organizations keep their workloads running—even during unexpected compute spikes. Now available in preview, this feature allows for automatic billing for excess capacity usage, based on limits you set, instead of throttling operations, ensuring smoother experiences when workloads exceed the limits of your purchased capacity.
Why capacity overage?
Fabric capacities have built‑in tools—bursting, smoothing, and throttling—to balance performance and capacity utilization limits. Under sustained high load, capacities may enter throttling phases, causing delays or rejected operations.
Capacity overage prevents these disruptions by automatically “paying off” compute overages in real time, clearing accumulated capacity debt and lifting the workloads back out of throttling. No jobs are paused or terminated—your operations continue normally. This option is billed at 3x the pay-as-you-go rate, making it suitable for occasional spikes to ensure availability. For prolonged excess usage, either performing further optimizations or moving up to the next higher sized capacity is recommended.
How capacity overage billing works
Fabric capacity admins are able to opt-in to this feature on a per-capacity basis, and set limits of how much overage they are willing to incur within a 24-hour period. If your billed overage reaches the set limit, Fabric will revert to normal throttling behavior. Interactive delays or job rejections may occur until the window resets or unless you increase the limit further. This prevents delays and keeps workloads running without interruption.
We also will soon be rolling out updates to the capacity metrics app to allow customers to view their overage billing utilization to ensure transparency. This information is also available through capacity events in real-time hub.
Learn more
Learn more in Capacity overage in Microsoft Fabric.
