The first table in the results file for the Ameren procurement event provides the average price and the quantity procured for each product and for each Combination. A Combination is a grouping of two or more Products. The second table provides the average price for each month of a given year and segment. The average price in the second table is the weighted average of (i) the average price for the product corresponding to the month, segment and year in question and (ii) the average price for each Combination procured that includes that product.
For example, the first table provides a quantity of 75 MW and an average price of $35.21/MWh for April 2016 on-peak. However, energy for the on-peak segment of April 2016 was also procured through the Mar-Apr2016 on-peak Combination (75 MW and an average price of $36.10) and through the Jun2015-May2016 on-peak Combination (125 MW and a price of $37.41). Thus the second table provides a quantity of 275 MW and an average price of $36.45.