Repsol said on Tuesday production has restarted at its El Sharara oil field in Libya.
The facility was closed last month after clashes with armed protestors and militants in the remote southern region of the country.
“Production restarted on Sunday, although it’s still not back to full capacity,” said a Repsol spokesman.
The oil field, owned and operated by Repsol, produces 340,000 barrels-per-day when it is operating a full capacity.
Libya accounts for around 12 percent of Repsol’s total output.
Analysts say the shutdown of the oil field cost Repsol and estimated $42 million.