Common problem when I worked with Scottish Power.
Was sent once to a switching station where all the copper earthing had been stollen form head hight down to the ground (all the towers were live at the time) We replaced it with 1 1/2" alliminum stapping. Only to get sent back a week later. They stole that too.
Called out to a sub station that had triped out to discover the undergound 11kv cable partly exposed. Someone had tried to dig it up then cut it live with an axe. We found the wooden axe handle but no head. Police phoned all the local hospitals but no one had been admitted with burns. It could only happen in Glasgow !!!!!!