<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, DC
FORM U-6B-2
Certificate of Notification
Filed by a registered holding company or subsidiary thereof pursuant to
Rule U-20-(d) [Reg. Section 250.20, P. 36,652] or U-47 [Reg. Section 250.47, P.
36,620] adopted under the Public Utility Holding Company Act of 1935.
Certificate is filed by: Ameren Corporation (AMC), Ameren Services (AMS), Ameren
Energy (AME), CIPSCO Investment Company (CIC), Union Electric Development
Corporation (UEDC), Ameren Energy Communications (AEC), Ameren Development
Corporation (ADC), Ameren ERC (ERC), Ameren Energy Resources Company (AER),
Illinois Material Supply Co. (IMS), Ameren Energy Generating Company (AEG) and
Ameren Energy Marketing Company (AEM).
This certificate is notice that the above named company has issued, renewed
or guaranteed the security or securities described herein which issue, renewal
or guaranty was exempted from the provisions of Section 6(a) of the Act and was
neither the subject of a declaration or application on Form U-1 nor included
within the exemption provided by Rule U-48 [Reg. Section 250.48, P. 36,621].
1. Type of securities ("draft", "promissory note"): Promissory Notes.
2. Issue, renewal or guaranty: Issue.
3. Principal amount of each security: A non-utility money pool allows
non-utility subsidiaries of AMC to contribute and/or borrow funds
without going to an external provider or creditor. The principal
amount is limited only by cash available. Funds are borrowed and/or
repaid daily as cash needs dictate. See Attachments A (Contributions
to the Non-Utility Money Pool) and B (Loans from Non-Utility Money
Pool) for daily outstanding contributions and loans.
4. Rate of interest per annum of each security: Rates varied daily along
with money market rates, as defined in the Agreement. (See Attachment
C for daily rates.)
5. Date of issue, renewal, or guaranty of each security: Various. (See
Attachments A and B.)
6. If renewal of security, give date of original issue: Not applicable.
7. Date of maturity of each security: All loans were made for one day, or
in the case of Friday borrowings, until the next work day, and repaid
or rolled over the next business days, as need dictated. (See attached
Attachments A and B.)
8. Name of the person to whom each security was issued, renewed or
guaranteed: Not applicable.
9. Collateral given with each security: None.
10. Consideration given for each security: None, other than interest
accrued.
11. Application of proceeds of each security:
a) Loaned as needed to AME. (See Attachment B)
b) Loaned as needed to CIC. (See Attachment B)
c) Loaned as needed to AEC. (See Attachment B)
d) Loaned as needed to ERC. (See Attachment B)
e) Loaned as needed to AER. (See Attachment B)
f) Loaned as needed to AEG. (See Attachment B)
g) Loaned as needed to IMS. (See Attachment B)
h) Loaned as needed to AED. (See Attachment B)
i) Loaned as needed to AEM. (See Attachment B)
j) Loaned as needed to AMS. (See Attachment B)
<PAGE>
12. Indicate by a check after the applicable statement below whether the
issue, renewal or guaranty of each security was exempt from the
provisions of Section 6(a) because of:
a) the provisions contained in the first sentence of Section 6(b):
All notes.
b) the provisions contained in the fourth sentence of Section 6(b):
Not applicable.
c) the provisions contained in any rule of the Commission other than
Rule U-48: Rule 52.
13. If the security or securities were exempt from the provisions of
Section 6(a) by virtue of the first sentence of Section 6(b), give the
figures which indicate that the security or securities aggregate
(together with all other than outstanding notes and drafts of a
maturity of nine months or less, exclusive of days of grace, as to
which such company is primarily or secondarily liable) not more than 5
percentum of the principal amount and par value of the other
securities of such company then outstanding. (Demand notes, regardless
of how long they may have been outstanding, shall be considered as
maturing in not more than nine months for purposes of the exemption
from Section 6(a) of the Act granted by the first sentence of Section
6(b)): AMC's capitalization consists of 137,215,462 shares of issued
and outstanding common stock. The fair market value of the Common
stock during the second quarter, on a per share basis, ranged from
$30.625 to $38.00. 5% of the total fair market value therefore ranged
from $210,111,176 to $260,709,378. Thus, at all times the amount
outstanding as filed on this certificate was less than 5% of the fair
market value capitalization.
14. If the security or securities are exempt from the provisions of
Section 6(a) because of the fourth sentence of Section 6(b), name the
security outstanding on January 1, 1935, pursuant to the terms of
which the security or securities herein described have been issued.
Not applicable.
15. If the security or securities are exempt from the provisions of
Section 6(a) because of any rule of the Commission other than Rule
U-48 [Reg. ss. 250.48, P. 36,621] designate the rule under which
exemption is claimed. Not applicable.
/S/ Jerre E. Birdsong
---------------------------
Jerre E. Birdsong
Ameren Corporation
Dated: August 24, 2000