Within-day gas price rose 2.60 pence to 30.00 pence per therm at 1428 GMT.

Day-ahead gas price rose 3.10 pence to 30.00 p/therm.

"The Nyhamna (outage) is looking much longer than expected," a gas trader said.

Operator Gassco said on Friday afternoon an outage at the processing plant would last until Aug. 26 at the earliest.

It had been scheduled to come back on July 6.

UK gas prices had fallen earlier in the day on expectations of higher supplies from Norway.

Peak wind generation is forecast at 6.2 gigawatts for Friday, dropping to 5.5 GW on Saturday.

Send-out from liquefied natural gas (LNG) terminals is seen steady at 13 mcm.

Day-ahead gas price at the Dutch TTF hub rose 0.55 euro to 10.90 megawatt hours to trade.

Benchmark Dec-19 EU carbon contract was up 0.29 euro at 26.31 euros a tonne.