UK GAS-Prompt prices up slightly on Norway outages, weather

* Norway Troll ramp-up slower than expected due to outage

* Exports to continental Europe increase

LONDON, April 29 (Reuters) - British prompt natural gas prices were slightly higher on Wednesday morning as cooler weather, Norwegian outages and increased exports to continental Europe weighed on the market.

Prices for delivery on Thursday were up 0.10 pence at 44.90 pence per therm at 0845 GMT. Prices for within-day delivery were at 45.00 pence per therm, up 0.05 pence since their last settlement.

With supply flows at about 218.7 million cubic metres (mcm) per day on Wednesday and demand expected to be about 222.1 mcm, the system was 3.4 mcm undersupplied, National Grid (LSE: NG.L - news) data showed.

In Norway, the Troll gas field has come back online after a period of maintenance. However, a compressor problem has resulted in an unplanned outage, reducing capacity.

"Troll is ramping up slower than expected as its production is still affected by an outage at compressor," said Thomson Reuters Point Carbon analysts.

Flows through the Langeled pipeline to Britain, however, are still unchanged from Tuesday at 20 mcm as any increase in Norwegian production is going to continental Europe.

"There is some short-term tightness in the system created by Norwegian outages along with slightly cooler weather than last week and continued high exports to the Continent," said Nick Campbell, risk manager at Inspired Energy Plc (LSE: INSE.L - news) .

"The prompt is being supported but further along the curve, monthly products are trading lower as the LNG supply picture remains healthy and the view is the outages are short term. Therefore, when full flows return this will lower exports to the Continent and leave the UK system balanced too long," he added.

Further along the curve, gas for May delivery was 0.10 pence higher at 43.60 pence per therm.

In the Netherlands, the day-ahead gas price at the TTF hub was 0.15 euros lower at 21.45 euros per megawatt-hour (MWh).

The benchmark European Union carbon price edged 0.03 euros higher to 7.42 euros a tonne on ICE Futures Europe. (Reporting by Ahmed Aboulenein; Editing by Nina Chestney and Gareth Jones)