What is the amount of fuel that should be on hand to power generators for backup datacenter power, in all tiers, according to the Uptime Institute?

According to the Uptime Institute, the amount of fuel recommended for backup generators in data centers is typically expected to last for at least 12 hours. This timeframe is critical because it allows organizations to maintain power continuity during a power outage, providing sufficient time for operational recovery, system shutdown procedures, and transitional efforts toward alternative power sources or restoration of normal operations.

Having a fuel supply that can sustain generators for this length of time ensures that key systems and data remain accessible and protected against potential loss or corruption during an unexpected outage. Although varying standards exist regarding fuel capacity, the 12-hour guideline helps establish a baseline that balances immediate operational needs with practical considerations of storage and resource management.