The National Grid has advised the public to avoid using the internet and other connected devices for at least 24 hours.
Affected customers are advised to take advantage of the free time available by using their mobile devices and computers.
Agency spokeswoman Emma Clements said: “The NFS can confirm that the NFS is advising customers not to use their mobile phones or other connected equipment to connect to the network until further notice.”
We apologise for any inconvenience caused and we would encourage customers to use the internet as much as possible.
“The outage has been blamed on an intermittent power outage caused by a power cable problem.
The grid said it had received reports of a power failure affecting more than 20,000 customers, but it was unclear whether any of those were affected.”
All affected customers are being advised to check with their provider and see what is the cause of the outage,” the spokeswoman said.
The National Grid said it was also working with power providers to ensure customers are aware of the power outage.
The outage was first reported at 2:00pm local time (07:00 GMT) on Monday.
A spokeswoman for the National Grid told the BBC that a total of 1.8 million customers in England were affected by the problem.”
The National Energy Board has now advised that all affected customers should continue to use mobile phones and computers and are advised not to go outside or to take photographs of the ground,” the National Energy and Climate Change Authority (NEA) said in a statement.”
However, NEA also advises customers should check their electricity usage by calling the utility.
“A spokeswoman from the National Electrical Trades Union said the union was calling on the Government to take action to ensure the reliability of the network.”
Any disruption to the electricity supply should be dealt with swiftly and safely and should be repaired and replaced immediately,” she said.”
This is the responsibility of the Government.
The NERC is also providing a free phone advice service.