Power has been restored after an "uplanned" outage impacted a number of properties in East Cambridgeshire.
UK Power Networks said it was investigating the issue and confirmed a "fault" had occured on a piece of its electrical equipment on Monday, November 25.
It is understood 19 customers are affected by the outage.
An update posted on its website said: "We became aware of a power cut at 10:17am. We’re sorry for any disruption this may have caused you.
"We didn’t know in advance there would be a power cut but now that we know, our teams will do everything they can to get your power back quickly.
"We believe there may be an underlying issue causing the recent power cuts, but due to the nature of the electricity network, the heat created by a developing fault can cause a break in a cable to reseal itself.
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It added: "This can make it difficult to locate, so while our engineers are testing our equipment thoroughly to pinpoint the issue, this kind of problem may interrupt power multiple times before it's possible for us to fix."
Power was expected to be restored between 2pm and 3pm but the operator said this could change once engineers assessed the local network.
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