BT and Plusnet clients were not able access a few sites once more, after issues with the administration yesterday.
The firm said the blame originated from Telehouse North, a trade in London's Docklands.
Telehouse North affirmed that its system had been influenced by a stumbled electrical switch however that architects were presently on location.
BT said that network came back to typical by 13:45 BST, however some bigger organizations may in any case have issues.
There were reports of different associations encountering network inconvenience, including HMRC.
On Wednesday, numerous clients discovered they were not able visit certain sites and access some web saving money administrations.
Those challenges were faulted for a different power cut at the Equinix Telecity Harbor Exchange.
A representative for Linx - an accomplice of Equinix - affirmed that its frameworks were unaffected today.
Telehouse North said the stumbled electrical switch at its office had affected "a particular and constrained gathering of clients".
"The issue has been examined and the arrangement distinguished," a representative included. "Our architects are working with our clients on the determination at this moment."
Across the board issues
Different associations endured availability issues.
HMRC tweeted an announcement saying that clients may experience issues getting to their frameworks because of "a national IT provider having far reaching broadband foundation issues".
What's more, AIB said "specialized issues" had influenced web, tablet and versatile managing an account.
In any case, it was uncertain that these shortcomings were caused by the Telehouse North power disappointment.
In the present proclamation, BT said that the most recent power disappointment was "significant" yet had influenced "under five percent" of clients' web utilization.
"BT made prompt move to limit these issues by diverting activity," it said.
Security master Alan Woodward at the University of Surrey told the BBC the issues were a "worry".
"In the event that this level of interruption can be caused by a power issue on one story of one building lodging some portion of the framework in the UK, you truly need to solicit how strong is this piece from basic national foundation," he said.
"Security doesn't simply mean ensuring against aggressors, it implies dependability as well."
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