Areas of Yeovil and Sherborne are suffering power cuts.
Locals have reported that there have been problems with the traffic lights on Lysander Road, Yeovil.
A spokesman at Yeovil Police Station said the station's power was down and they were using a back up generator.
He added that police were aware that traffic lights on Lysander Road were down.
Traffic queues have formed at the Forest Hill Junction.
Yeovil Library has closed temporarily due to the power failure which has also affected town centre businesses.
There are also said to be power problems in Milborne Port and at Cheap Street, Westbury and the railway station in Sherborne.
Traffic lights on the A30 from Yeovil to Sherborne are now working again.
Further details to follow from Scottish and Southern Electric.
