Sheffield City Council has apologised and says it is still trying to get back up and running after this morning's power cut which affected dozens of businesses across the city centre.
Shops and homes hit by the blackout are now up and running normally again but the council has tweeted to say that it is still experiencing problems.
Earlier this afternoon, the council's official Twitter feed posted: "We're still working to fix systems trouble caused by offsite power failure. Thanks for bearing with us. We're sorry for the problems caused."
It is understood that staff at the Town Hall are unable to access emails or get online and that computer systems are still down following the power cut this morning.
Hundreds of homes and businesses were hit, with almost 500 buildings affected with major stores including Marks and Spencer, WHSmith, HMV and McDonald's having to temporarily close their doors.
Premises in the S1, S6 and S8 areas of Sheffield were hit but a spokesman for the city's Sheffield Teaching Hospitals NHS Trust said none of its hospitals had been affected.
Northern Powergrid said that the problem had been caused by a problem with an underground cable and buildings such as The Crucible Theatre, Curzon Cinema and Central Library had all been blacked out.