UK GAS-Prompt prices slip on weak demand, higher imports

* Imports through Langeled around 70 mcm/day

* Peak wind power output at 7.2 GW

LONDON, Dec 10 (Reuters) - British spot gas prices fell on Thursday morning as unseasonably mild weather and high output from wind farms dented demand while gas imports from Norway rose.

Gas for within-day delivery was at 36.10 pence per therm at 0938 GMT, down 0.15 pence since the last settlement.

Gas for day-ahead delivery fell 0.20 pence to 36.30 pence per therm.

With (Other OTC: WWTH - news) supply flows at about 273 million cubic metres (mcm) and demand expected to be about 271.3 mcm, Britain's gas system was almost balanced, National Grid (LSE: NG.L - news) data showed.

Imports from Norway via the Langeled pipeline, Britain's main sub-sea gas import route, were near full capacity at around 70 mcm on Thursday morning, National Grid data showed, up from levels below 60 mcm the previous day.

Supply also resumed from the Bacton Seal gas terminal on Thursday morning, with flows at around 20 mcm/day from zero on Wednesday morning.

Britain's Met Office said temperatures but could reach as high as 10 or 11 degrees Celsius in the south of the country, compared with average temperatures for December of around 6 degrees.

Strong output from wind farms also contributed to weak demand for gas from power stations.

Peak wind generation was forecast at 7.2 gigawatts (GW) on Thursday and 6.5 GW on Friday, National Grid data showed.

Gas prices further along the curve edged lower, with the Q1 16 contract down 0.30 pence at 36.50 pence per therm.

In the Netherlands, the day-ahead gas price at the TTF hub fell 0.20 euros to 16.45 euros per megawatt hour (MWh).

In Europe's carbon market the front-year EU Allowance (EUA) price dipped 0.07 euros to 8.33 euros per tonne. (Reporting by Susanna Twidale; editing by Jason Neely)