Notice of Commission Action

              December 21, 2006
Central Illinois Light Company :
d/b/a AmerenCILCO :
: 06-0070
Proposed general increase in rates for delivery :
service. (tariffs filed December 27, 2005) :
(Cons.)
Central Illinois Public Service Company :
d/b/a AmerenCIPS :
: 06-0071
Proposed general increase in rates for delivery :
service. (tariffs filed December 27, 2005) :
Illinois Power Company :
d/b/a AmerenIP :
: 06-0072
Proposed general increase in rates for delivery :
service. (tariffs filed December 27, 2005) : SERVED ELECTRONICALLY
NOTICE OF COMMISSION ACTION
TO ALL PARTIES OF INTEREST:
Notice is hereby given that the Commission, in conference on December 20, 2006, GRANTED in Part
and DENIED in Part the Petition for Rehearing of the Ameren Companies filed on December 11, 2006.
Notice is also given that the rehearing was granted to determine the appropriate amount of
Administrative and General Expenses to be included in each of Central Illinois Light Company d/b/a
AmerenCILCO, Central Illinois Public Service Company d/b/a AmerenCIPS, and Illinois Power Company d/b/a
AmerenIP revenue requirement. In presenting their direct testimony, AmerenCILCO, AmerenCIPS, and
AmerenIP are directed to provide (1) the results of a study showing the costs of services obtained from Ameren
Services Company and comparing those costs with market costs and (2) an analysis of the services provided
by Ameren Services Company to all Ameren companies and provide details on how those costs are allocated
among the companies, as described in Section IV. E. 1. e of the Commission’s November 21, 2006 Order and
as offered in Section III. A. 3 of the Petition for Rehearing. The Commission denied the remainder of the
December 11, 2006 Petition for Rehearing.
Accordingly, a status hearing in this matter will be held at the offices of the Commission, Springfield,
Illinois, Leland Building, 527 East Capitol Avenue, on January 3, 2007, at the hour of 10:00 A.M.
Sincerely,
Elizabeth A. Rolando
Chief Clerk
EAR:ct
Administrative Law Judges Albers & Yoder
cc: Accounting Rates Finance Engineering
Ms. Jones Mr. Luth Ms. Freetly Mr. Spencer
Ms. Ebrey Ms. Harden Mr. Pregozen Mr. Rockrohr
Mr. Struck Mr. Lazare
Mr. McNally – Finance