Prompt British gas prices eased on ample supply on Friday morning, while curve gas contracts and prompt power climbed. Gas for delivery on Friday dipped to 51.75 pence per therm, down about 4.25 pence from the previous close, while contracts for weekend delivery fell a penny to 52.00 pence as increased flows from the North Sea left the system awash with gas. But baseload power for Monday traded at around 84 pounds per megawatt hour, with power supply margins looking tight for the start of next week, according to data from National Grid. But traders said power market trade was very thin. Winter 08 gas contracts were slightly firmer on Friday morning than at the close on Thursday at around 101.75 pence, while Winter 09 gas dipped 0.75 to 101.75 pence. Carbon emissions rights prices for December 2008 also fell, down 22 euro cents at 24.95 euros.