EUROPE GAS-Prices hover around 15-month lows amid comfortable supply

Aug 20 (Reuters) - Dutch and British wholesale gas prices largely traded sideways on Wednesday morning, remaining at around 15-month lows, with supplies stable and no major changes to the demand outlook.

The benchmark Dutch front-month contract at the TTF hub TRNLTTFMc1 was up 0.23 euro to 31.30 euros per megawatt hour, or $10.68 per mmBtu, at 0826 GMT, LSEG data showed.

The British front-month contract TRGBNBPMc1 traded up 0.60 pence at 77.05 pence per therm, while the day ahead price TRGBNBPD1 was up 0.11 pence at 76.51 pence per therm.

Day-ahead prices are set to remain in their recent range given no notable changes to supply or demand over the coming days, said Wayne Bryan, gas research principal at LSEG.

Nominations for Norwegian gas flows to Europe were flat at 321 million cubic metres per day, data from infrastructure operator Gassco showed.

"With prices at a 15-month low, we expect the market to stabilize today," Karsten Sander Nielsen, senior market analyst at Mind Energy, said.

The European supply situation is healthy right now and has led to optimism in the market that the coming winter will not be as hard on Europe as previously feared, he added.

EU gas storage sites were last seen 74.2% full, Gas Infrastructure Europe data showed.

Injections into storage at their current rates would see Europe's pre-winter target of 90% achieved by mid-October, analysts at Northern Power & Gas said in a morning briefing.

An auction on Tuesday for 3 terawatt hours of storage capacity at Germany's largest storage site Rehden, which is only 20% full at present, failed to attract any bids, operator SEFE said.

In the European carbon market, the benchmark contract CFI2Zc1 was down 0.29 euro at 70.87 euros per metric ton.