On August 19, 2024, Ameren Illinois Company d/b/a Ameren Illinois ("AIC" or the "Company") initiated this proceeding pursuant to its Rider CEAC ― Clean Energy Assistance Charge ("Rider CEAC"), Ill.C.C. No. 1, 3rd Revised Sheet No. 52, et seq., for the Commission to determine the accuracy and prudence of the purchase of Zero Emission Credits ("ZECs") from Zero Emission Facilities that AIC recovered through Rider CEAC during the 12-month period ending May 31, 2024 ("Reconciliation Period").