The power went off at around 00:30, according to residents, with a “very large volume of calls” to its emergency line.
Some complained that their calls went unanswered.
The utility company has not yet confirmed the cause of the fault.
The impact is still being felt in the States of Guernsey’s IT systems, which suffered a number of issues throughout December.
A States spokesperson said this morning: “Unfortunately as a result of the power outage overnight in St Peter Port, some IT systems including gov.gg have been affected this morning. This has particularly affected systems that were still undergoing restoration work following the outage issues in December.”
Pictured: States’ IT systems that were still being restored following an outage in December were affected by this morning’s power cut in St Peter Port.
On 16 December, the States said its IT systems were online and it was “business as usual”.
It followed everything going offline, from schools’ wifi and email accounts to benefit payments, when a server room at Frossard House got too hot after an air conditioning problem on 25 November.
A switchover to a backup system failed and an investigation is under way.
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