US prices are the weighted average of assessments by Natural Gas Week for five trading days, spanning May 15-May 22. European gas prices are WGI assessments on May 23 for day-ahead delivery May 24. European power prices are from exchanges on May 22 for day-ahead power May 23.Gas quotes on top. power below. Heat efficiency of 7,000, or 48%, is used to calculate spark spreads, i.e. 7 MMBtu of gas generates I MWh of electricity.
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