People are being warned they could be in for "blackout chaos" after a union balloted members. Around 1,300 workers responsible for repairing, maintaining and administrating the electricity grid for London and the South East and East of England are being asked to vote over potential strike action.
Unite says if members vote to strike then action could begin in March. A decision is expected on Tuesday.
The union said workers, employed by UK Power Networks, are angry that the company, which usually offers an annual wage rise that meets or exceeds RPI inflation, has "put forward a much-reduced pay offer".
