British prompt wholesale gas prices rose on Aug. 8 morning due to a fall in imports from Norway and maintenance at an LNG terminal, while uncertainty over Russian supplies also kept Dutch prices at high levels.

The British day-ahead contract rose by 20 pence to 295.00p per therm by 9:50 GMT, while gas for immediate delivery was up by 22p to 305.00p per therm.

"Factors on the bullish side include a full-day capacity impact maintenance at the Dragon [LNG terminal] on the next two days...as well as the ongoing unplanned outage at Sleipner [in Norway]," said Refinitiv analysts.

The Dragon LNG terminal will undergo maintenance from today until Aug. 10, which will limit LNG send-out.

An unplanned outage at Norway's transportation hub Sleipner has also affected production and flows to the UK.

Norwegian gas pipeline nominations for the U.K. on Aug. 8 dropped by 9 MMcm/d to 71 MMcm compared with the previous day.

The U.K. system was under-supplied by around 3.3 MMcm, National Grid data showed.

Weak wind speeds also supported U.K. gas prices. The U.K. peak wind generation forecast was at 2.7 gigawatts (GW) for Aug. 8, and was expected to rise to 4.6 GW on Aug. 9, compared with a total metered capacity of nearly 20 GW, Elexon data showed.

Temperatures in the U.K. and northwest Europe are expected to rise this week and stay above seasonal averages, increasing demand for gas from power generators.

In the Dutch market, the gas price for September delivery was up by 3.48 euros to 197.73 euros per MWh.

Eastbound gas flows via the Yamal-Europe pipeline to Poland from Germany increased on Aug. 8 after a brief drop, while physical flows through the Nord Stream 1 pipeline from Russia to Germany remained steady, operators' data showed.

Nord Stream 1 is running at just 20% capacity as a result of faulty or delayed equipment, Moscow has said.

Siemens Energy is in talks with the Russian state company over the transport of a turbine that is stuck in Germany following maintenance because of disagreements between Berlin and Moscow over documents needed to move it.

In the European carbon market, the benchmark contract edged up by 0.35 euro to 85.11 euros a tonne.