An explosion near the Zawiya power station in Libya, west of the capital Tripoli, knocked a number of generating units offline, the state-run General Electricity Company said on Saturday.
The company said in a statement that technical teams were investigating the cause of the explosion and working to restore electricity supplies gradually.
The incident comes days after the company said an attack on the South Zawiya substation caused a complete outage and cut power to wide areas south of the city.
Several drone attacks were reported at the site since last Sunday.
Attacks target oil infrastructure
Attacks in Zawiya last week have also targeted oil infrastructure, including fuel storage tanks at the city's oil complex, home to Libya's largest operating refinery.
A tank, with an estimated 4.5 million liters of gasoline, "was directly targeted," NOC said in a statement, declaring the extreme state of emergency in the area.
Zawiya refinery, the largest in the country as Ras Lanuf is out of operation, around 40 km (25 miles) west of Tripoli, has a capacity of 120,000 barrels per day. It is connected to the country's 300,000 bpd Sharara oilfield.
Jerusalem Post Staff contributed to this report.