The largest of Kuwait's three oil refineries was fully operational on Friday after a power cut shut all of them in the week, but the other two are still not at full production, a spokesman said.

The 460,000-barrels-per-day (bpd) Mina Ahmadi refinery was working at 100 per cent early on Friday, a spokesman for the Kuwait National Petroleum Company (KNPC) said.

The 270,000-bpd Mina Abdullah and 200,000-bpd Shuaiba refineries were working at around 60 per cent and are expected to be fully operational by Saturday, the spokesman added.

The three refineries, built next to each other on the Gulf coast south of the capital, were shut down by a power outage on Wednesday and have been slowly restarted by KNPC.

OPEC member Kuwait has been using its reserves to prevent a disruption to exports. Power cuts often occur in Kuwait because of its outdated and unstable electricity supply system.-Reuters