A reckless firebug caused thousands of pounds worth of damage after torching a mobile phone mast and electricity box.
Emergency crews raced to Thorn Hill, in Johnstone, after reports of a blaze at around 11.30pm on Wednesday.
A bin was deliberately set alight next to the electrical box and quickly spread to the mast, investigators said.
It was established that the fire had been started deliberately and detectives were brought in.
Cops said the estimated damage is likely to run into thousands of pounds but have yet to establish an exact cost.
It is understood a person dressed entirely in black was spotted close to the scene around the fire, who officers are keen to speak to.
They are described as around 6ft tall, wearing a dark top and trousers and a woollen hat.
There are no reports of any injuries.
Detective Inspector Ian Ross, from Paisley CID is leading the investigation and appealed for anyone with information to come forward.
He said: “The Scottish Fire and Rescue Service were called to a fire in Thorn Hill, Johnstone around 11.30pm on Wednesday.
“Extensive damage was caused to an electrical box and a telephone mast.
“We are now treating the incident as wilful fireraising and are carrying out enquiries in the area to identify the individual responsible.
“We know a person was seen in the area around the time of the incident who we are keen to trace as they may be able to assist with our investigation.”
He added: “We would appeal to anyone who may have witnessed what happened or have information in relation to the incident to come forward to officers.
“We will be reviewing CCTV in the area and carrying out door-to-door enquiries in the coming days.”
Anyone with information should call police on 101 or Crimestoppers anonymously on 0800 555 111