The oil workers’ union, after an emergency National Executive Council meeting on Saturday, directed its members in all oil and gas installations to down tools until the sackings were reversed.

The action could cripple crude production, fuel supply, gas distribution and now electricity generation, worsening the hardship faced by Nigerians.

With thermal stations accounting for more than 70 per cent of Nigeria’s electricity supply, industry experts say the shutdown will trigger widespread outages, stretch hydro plants beyond capacity and heighten the risk of a nationwide system collapse.