Nigeria, Dec. 30 -- The Nigerian Independent System Operator (NISO) said it has fully restored electricity supply to all parts of the country and the system stability has normalised.

NISO disclosed this in a statement signed by its management on Monday night.

The Independent System Operator said the national grid experienced a system disturbance at 2:01 p.m. on Monday, leading to a partial collapse.

On Monday, electricity distribution companies (DisCos) announced a power outage affecting their franchise areas. The DisCos said the outage was due to a loss of supply from the national grid, which occurred on Monday afternoon.

According to NISO, the disturbance involved the tripping of several generating units and critical 330kV transmiss...