* Norway's Kollsnes ramps up production
* Imports from Norway up around 30 mcm/day
* Temperatures expected to drop at weekend
April 15 (Reuters) - British prompt gas prices fell on Friday morning due to higher imports from Norway.
Gas for immediate delivery fell by 0.8 pence or 2.8 percent to 27.95 pence per therm at 0908 GMT, while the day-ahead contract lost 0.35 pence or 1.25 percent, to 27.65 pence/therm.
With (Other OTC: WWTH - news) supply flows forecast at around 236 million cubic metres (mcm) and demand seen at 250 mcm/day, Britain's gas system was expected to be 14 mcm undersupplied, National Grid (LSE: NG.L - news) data showed.
However, actual physical flows were at 245 mcm/day as Norwegian gas imports through the Langeled pipeline rose by 34 mcm to 60 mcm/day.
Britain's gas demand, however, is forecast to be some 20 percent higher than normal due to an increase in gas use for heating and power generation.
Maximum temperatures in London and South East England are forecast to fall from 15 degrees Celsius on Friday to 10 degrees on Saturday, UK's Met Office said.
"A marked drop in temperatures is expected over the weekend and (gas) maintenance planned during the remainder of April could limit further price falls," a UK-based trader said.
In the power market, Britain's 599-megawatt Sizewell B-2 reactor went offline for maintenance on Friday, with three other reactors already out of service.
In the Dutch gas market, the day-ahead gas price at the TTF hub inched lower by 0.03 euro to 11.25 euro/MWh.
In the European carbon market, front-year allowances eased 0.05 euro to 5.56 euro a tonne. (Reporting by Nerijus Adomaitis; editing by Nina Chestney)