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Average Prices ($/MW-Day) and Quantiti“In accordance with Section 16-111.5(h) of the Public Utilities Act, this public notice announces the names of the successful bidders and the average winning bid price for each contract type and for each contract term. 220 ILCS 5/16-111.5(h). In accordance with previous Commission orders, quantity information is only provided where the number of successful bidders is greater than two.”

Winning Suppliers Include:

• Constellation Energy Generation, LLC 
• Dynegy Marketing and Trade, LLC 
• Maple Flats Solar Energy Center LLC 
• Voltus, Inc.

Average Prices ($/MW-Day) and Quantities (ZRCs) of Products and Annual Combinations (2026-2027). 

Product/Annual Combination Average Price Quantity 

Summer 2026 829.50 100 

Fall 2026 131.39 45 

Winter 2026-2027 — — 

Spring 2027 105.07 75 

Annual Combination 2026-2027 287.18 350 

Average Prices ($/MW-Day) and Quantities (ZRCs) of Contracts (2026-2027).1 

Season Average Price Quantity 

Summer 2026 407.70 450 

Fall 2026 269.43 395 

Winter 2026-2027 287.18 350 

Spring 2027 255.04 425 

Average Prices ($/MW-Day) and Quantities (ZRCs) of Products and Annual Combinations (2027-2028). 

Product/Annual Combination Average Price Quantity 

Summer 2027 858.50 233 

Fall 2027 113.32 438 

Winter 2027-2028 — — 

Spring 2028 115.50 56 

Annual Combination 2027-2028 339.73 4

Average Prices ($/MW-Day) and Quantities (ZRCs) of Contracts (2027-2028).2 

Season Average Price Quantity 

Summer 2027 849.74 237 

Fall 2027 115.37 442 

Winter 2027-2028 339.73 4 

Spring 2028 130.45 60 

* Note: Load serving entities, such as Ameren, must acquire ZRCs to satisfy certain resource adequacy requirements imposed by the Midcontinent Independent System Operator, Inc. (“MISO”). ZRCs represent a commitment of capacity from planning resources that can be relied upon by MISO.

IPA Notice-of-September-2025-Procurement-Results Ameren-ZRCs-2025  (10/02/2025)