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jeff.s...@nist.gov to Internet-time-service Dec 19 Dear colleagues, In short, the atomic ensemble time scale at our Boulder campus has failed due to a prolonged utility power outage. One impact is that the Boulder Internet Time Services no longer have an accurate time reference. At time of writing the Boulder servers are still available due a standby power generator, but I will attempt to disable them to avoid disseminating incorrect time. The affected servers are: time-a-b.nist.gov time-b-b.nist.gov time-c-b.nist.gov time-d-b.nist.gov time-e-b.nist.gov ntp-b.nist.gov (authenticated NTP) No time to repair estimate is available until we regain staff access and power. Efforts are currently focused on obtaining an alternate source of power so the hydrogen maser clocks survive beyond their battery backups. More details follow. Due to prolonged high wind gusts there have been a combination of utility power line damage and preemptive utility shutdowns (in the interest of wildfire prevention) in the Boulder, CO area. NIST's campus lost utility power Wednesday (Dec. 17 2025) around 22:23 UTC. At time of
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