An auction service is provided that stimulates competition between energy suppliers (i.e., electric power or natural gas). A bidding moderator receives offers from competing suppliers specifying the economic terms each is willing to offer to end users or resellers for estimated quantities of electric power or gas supply (separate auctions). Suppliers receive feedback from the moderator based on competitors' offers and have the opportunity to adjust their own offers down or up, depending on whether they want to encourage or discourage additional energy delivery commitments in a particular geographic area or to a particular customer group. Each supplier's offers can also be changed to reflect each supplier's capacity utilization. The moderator selects one or more suppliers to provide electric power or natural gas to each end user or reseller, with each supplier providing at least a portion of the electric power or natural gas needed by each end user or reseller during a specific future time interval.
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