South Africa’s biggest city and economic hub Johannesburg could have its power supply throttled by state-owned electricity company Eskom over unpaid debts, Eskom said on Tuesday. Engineering News reported on Monday that the utility had, in an advertisement published on Sunday, confirmed that the city and/or City Power owed it more than R5.25-billion and that it had decided to initiate a process that could result in the interruption of power supply “to stop spiralling debt”.