UK GAS-Prompt prices rise on undersupply, lower Norwegian imports

LONDON, April 4 (Reuters) - Prompt British wholesale gas prices rose on Tuesday morning as a dip in imports from Norway led to an undersupplied system. * British day-ahead gas price up 1.10 pence to 41.50 pence per therm at 0810 GMT. * Within-day contract up 1.40 pence to 41.70 p/therm. * System undersupplied by 17.1 mcm with demand forecast at 246.5 million cubic metres (mcm) and flows at 229.4 mcm/day, National Grid data shows. * Traders said prices up after an outage in Norway cut gas exports to Britain. * Imports from Norway through Langeled below 50 mcm/day, down from around 60 mcm on Monday. * An unplanned outage at Norway's Kvitebjørn gas field cut its output by 11 mcm/day Norwegian gas system operator Gassco said. * An unplanned outage at Britain's Heysham 1-2 nuclear reactor helped to increase demand for gas from power stations and push up power prices. * The wholesale day-ahead power contract rose 2.25 pence to 42.90 pounds/megawatt hour. * May gas contract up 0.78 pence to 40.85 p/therm * Winter 2017 contract up 0.53 pence to 47.20 p/therm * Day-ahead gas price at the Netherlands' TTF hub up 0.20 euro to 16.30 euros per megawatt hour. * Benchmark Dec-17 EU carbon contract down 0.09 euro to 4.78 euros per tonne. * Carbon prices down after European Commission data on Monday showed emissions covered by the bloc's Emissions Trading System (ETS (Shenzhen: 002545.SZ - news) ) likely fell by 2.7 percent in 2016, thereby cutting demand for carbon permits. * Thomson Reuters (Dusseldorf: TOC.DU - news) analyst view: http://emea1.apps.cp.extranet.thomsonreuters.biz/cms/?pageid=united-kingdom-gas (Reporting by Susanna Twidale; editing by Jason Neely)

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