Dispatch Dispatcher
Communication Breakdown; Situational Awareness; Time Pressure; Troubleshooting
ATC Issue All Types; Inflight Event / Encounter Fuel Issue
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Diverted
Environment - Non Weather Related; Procedure
After departure from ZZZZ [Airport]; while enroute; ZZZ Center announced a closure from XA:Y0z-XC:Y0z. The NOTAM announcing the closure did provide routing through ZZZ Center during the closure. Flight AB approached the northern border of ZZZ Center at XB:Y0z and was placed into holding to allow 10 nm of separation between aircraft in a non-radar environment. Flight AB was informed to expect further clearance at XA:X0Z. Because the closure was not known at the time Dispatch prepared the release; the additional fuel needed was not planned.  Flight AB was released with 17 min RPF fuel and no contingency fuel. The Captain called Dispatch on SATCOM at XB:Y5z and briefed the enroute delay. Captain was not comfortable delaying until XA:X0Z and diverted into ZZZ [Airport].   ATC Center COVID cleanings come with relatively short notice i.e.; no more than 6 hours. For lengthy flights such as this one; additional contingency fuel even with excellent destination weather would have provided more options.
Dispatcher reported the information regarding an ATC Zero event was not received in time to change the aircraft's fuel load and prevent a diversion.