The Midland Metro service was brought to a halt when lightning struck power equipment on Thursday afternoon.
Trams were halted between stations after the lightning struck
Trams, many between stations, were stopped on the route between Birmingham and Wolverhampton as the bolt hit overhead cables.
This caused a power surge, tripping electricity breakers.
The service was fully restored in the evening after engineers located the site of the strike and repaired the damage.
Members of staff were sent to update passengers at stations as the lightning had also disrupted the system's public address system.
Spokesman Phil Bateman said: "It seems to have affected quite a lot of our fibre optics as well, so communications are a bit rough."
It was hoped a 20-minute service frequency would be restored after trams had been moved to the right places on the route.