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UK day-ahead power prices for September 25 firms on tight supply margins

London (Platts)--22 Sep 2017 852 am EDT/1252 GMT


UK day-ahead prices for Monday delivery rose more than 2% as supply margins stood at 4.5 GW and renewable generation fell sharply for Monday.


  • Supply margins for Monday reach 4.5 GW
  • Renewables drop more than 3.5 GW to 2.8 GW

At 11 am London time, baseload was at GBP48.60/MWh, up GBP2.45 on the day, while no peakload trades were heard before the close.

The extended peaks, which are block 3+4+5+6 and block 6 were at GBP54/MWh and GBP65/MWh, equating to GBP50.35/MWh.

Combined wind and solar power for Monday is expected to drop more than 3.5 GW to 2.8 GW, compared with the forecast for Friday of 6.7 GW.

National Grid's supply margin forecast for Monday is at at 4.5 GW, but it is expected to edge higher to 6.7 GW Tuesday and remain below 10 GW until September 29. Then margins will rise September 30 to 10.45 GW, and are projected to remain at nearly 12 GW in the first week of October.

Supply margins remained tight even though the 1 GW Britain-Netherlands interconnector was bought back online a day head of its expected return on Friday, according to traders.

"The BritNed is back, returned to full yesterday. BritNed returned earlier by one day to full capacity. The 2 GW French-UK interconnector is still running at half the capacity, which is 1 GW...[there are] still quite some coal plants needed next week," a trader said.

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