1. a) No later than the last day of each month, the Agency shall issue an invoice to each participating utility summarizing the total expenses paid by the Agency pursuant to Section 1200.210 in that month, or previous months. Nothing in this subsection prevents the Agency from providing additional invoices during the fiscal year, or prevents a participating utility from inquiring as to actual or estimated fee assessments incurred pursuant to this Part at any time.
2. b) No later than September 30 of each year, the Agency shall issue an invoice to each participating utility for up to 50% of the budgeted overhead for the fiscal year. No later than the last day of the month after the Agency has determined the amount of funds that can be transferred from the Illinois Power Agency Trust Fund, the Agency shall issue an invoice to each participating utility for the balance of the overhead reduced by the amount that will be transferred from the Illinois Power Agency Trust Fund (see 20 ILCS 3855/1-55).
3. c) No later than the last day of each month, each participating utility shall pay the full undisputed amount of all invoices issued pursuant to subsections (a) and (b) in prior months.
4. d) To the extent that a participating utility disputes the amount of one or more invoices, the participating utility shall pay the undisputed amount, and all disputed amounts shall be subject to Section 1200.240.

(Source: Amended at 50 Ill. Reg. 2515, effective February 4, 2026)