UK GAS-Prices ease on oversupplied system

* System oversupplied by 5.9 mcm

* Some gas rerouted from France to Britain

LONDON, April 23 (Reuters) - British prompt gas prices fell on Thursday as higher deliveries from Norway left the system oversupplied, and expectations of higher supplies from liquefied natural gas (LNG) terminals.

Gas for day-ahead delivery was trading 0.75 pence down to 45 pence per therm by 0715 GMT, while gas for immediate delivery was 0.50 pence lower at 45.03 pence/therm.

National Grid (LSE: NG.L - news) data showed supply was forecast at 203.4 million cubic metres (mcm) on Thursday, while demand was seen at 197.5 mcm, meaning the system was oversupplied by 5.9 mcm.

Pipeline gas imports from Norway rose by 6 mcm from the previous day as gas was rerouted to Britain and Germany due to a planned maintenance at a receiving terminal in France.

South Hook LNG terminal is expected to receive a new cargo on Friday and another one on Sunday, resulting in total LNG supplies rising to 40 mcm/day from around 30 mcm/day this week, data from Thomson Reuters Point Carbon showed.

"We expect deliveries from South Hook terminal to be about 10 mcm/day higher in May than its current rate as more cargoes get delivered at this terminal," analysts at Point Carbon said.

Further along the curve, gas for delivery next month was down 0.45 pence at 43.90 pence per therm.

Temperatures were expected to rise to up to 20 degrees at some parts of Britain on Thursday, falling a touch lower on Friday on cloudier weather, Britain's Met Office said.

In the Netherlands, the day-ahead gas price at the TTF hub was down 7 cents at 21.38 euros per megawatt-hour.

The benchmark European Union carbon price was trading 3 euro cents down at 7.09 euros a tonne on ICE Futures Europe. (Reporting by Nerijus Adomaitis, editing by William Hardy)