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 Company (AMS), Ameren Energy, Inc. (AME), CIPSCO Investment Company (CIC), Ameren Energy Communications, Inc. (AEC), Ameren ERC, Inc. (ERC), Ameren Energy Resources Company (AER), Illinois Materials Supply Co. (IMS), Ameren Energy Generating Company (AEG), Ameren Energy Marketing Company (AEM), Ameren Energy Fuels and Services Company (AFS), Ameren Energy Development Company (AED), Union Electric Development Corporation (UEDC) and Ameren Development Company (ADC). This certificate is notice that the above named companies have 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 agreement ("Agreement") 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 received for each security: Interest on loan amount. 11. Application of proceeds of each security: a) Loaned as needed to AME. (See Attachment B) b) Loaned as needed to AEC. (See Attachment B) c) Loaned as needed to ERC. (See Attachment B) d) Loaned as needed to AER. (See Attachment B) e) Loaned as needed to AEG. (See Attachment B) f) Loaned as needed to IMS. (See Attachment B) g) Loaned as needed to AED. (See Attachment B) h) Loaned as needed to AEM. (See Attachment B) i) Loaned as needed to AFS. (See Attachment B) j) Loaned as needed to ADC. (See Attachment B) k) Loaned as needed to CIC. (See Attachment B) l) Loaned as needed to UEDC. (See Attachment B) m) Loaned as needed to AMS. (See Attachment B) 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): Not applicable. 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: [X]. 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)): Not applicable. 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. Rule 52. /s/ Jerre E. Birdsong ------------------------------ Jerre E. Birdsong Vice President and Treasurer Ameren Corporation Dated: May 21, 2003 Attachment A Contributions to the Non-Utility Money Pool Outstanding Amounts (Thousands of Dollars) Date AEM AMC UEDC Total Beg Bal 0 314,370 1,100 315470 01/01/03 0 314,370 1,100 315470 01/02/03 0 314,770 1,100 315870 01/03/03 0 318,070 1,100 319170 01/04/03 0 318,070 1,100 319170 01/05/03 0 318,070 1,100 319170 01/06/03 0 318,270 1,100 319370 01/07/03 0 320,070 1,100 321170 01/08/03 0 320,070 1,100 321170 01/09/03 0 319,970 800 320770 01/10/03 0 332,770 800 333570 01/11/03 0 332,770 800 333570 01/12/03 0 332,770 800 333570 01/13/03 0 322,070 800 322870 01/14/03 0 323,570 800 324370 01/15/03 0 325,670 800 326470 01/16/03 0 327,170 800 327970 01/17/03 0 328,370 800 329170 01/18/03 0 328,370 800 329170 01/19/03 0 328,370 800 329170 01/20/03 0 328,370 800 329170 01/21/03 500 328,370 800 329670 01/22/03 7,400 325,070 800 333270 01/23/03 7,700 325,970 800 334470 01/24/03 7,700 341,970 800 350470 01/25/03 7,700 341,970 800 350470 01/26/03 7,700 341,970 800 350470 01/27/03 18,200 332,170 800 351170 01/28/03 18,200 342,170 800 361170 01/29/03 0 317,970 800 318770 01/30/03 0 319,770 0 319770 01/31/03 0 320,970 0 320970 02/01/03 0 320,970 0 320970 02/02/03 0 320,970 0 320970 02/03/03 0 327,270 0 327270 02/04/03 0 328,870 0 328870 02/05/03 0 330,170 0 330170 02/06/03 0 331,070 0 331070 02/07/03 0 333,670 0 333670 02/08/03 0 333,670 0 333670 02/09/03 0 333,670 0 333670 02/10/03 0 321,470 0 321470 02/11/03 0 331,270 0 331270 02/12/03 0 331,570 0 331570 02/13/03 0 331,570 0 331570 02/14/03 0 334,070 0 334070 Attachment A - (continued) Contributions to the Non-Utility Money Pool Outstanding Amounts (Thousands of Dollars) Date AEM AMC UEDC Total 02/15/03 0 334,070 0 334070 02/16/03 0 334,070 0 334070 02/17/03 0 334,070 0 334070 02/18/03 0 333,770 0 333770 02/19/03 300 334,370 0 334670 02/20/03 3,100 333,870 0 336970 02/21/03 9,000 326,470 0 335470 02/22/03 9,000 326,470 0 335470 02/23/03 9,000 326,470 0 335470 02/24/03 12,400 330,870 0 343270 02/25/03 11,100 335,570 0 346670 02/26/03 11,100 336,770 0 347870 02/27/03 14,700 333,770 0 348470 02/28/03 12,800 336,870 0 349670 03/01/03 12,800 336,870 0 349670 03/02/03 12,800 336,870 0 349670 03/03/03 12,700 336,570 0 349270 03/04/03 17,400 330,570 0 347970 03/05/03 17,400 331,870 0 349270 03/06/03 0 310,170 0 310170 03/07/03 0 312,370 0 312370 03/08/03 0 312,370 0 312370 03/09/03 0 312,370 0 312370 03/10/03 0 312,370 0 312370 03/11/03 0 324,070 0 324070 03/12/03 0 324,570 0 324570 03/13/03 0 315,070 0 315070 03/14/03 0 318,470 0 318470 03/15/03 0 318,470 0 318470 03/16/03 0 318,470 0 318470 03/17/03 0 317,570 0 317570 03/18/03 0 318,570 0 318570 03/19/03 0 319,770 0 319770 03/20/03 0 317,170 0 317170 03/21/03 0 327,370 0 327370 03/22/03 0 327,370 0 327370 03/23/03 0 327,370 0 327370 03/24/03 900 327,570 0 328470 03/25/03 0 330,470 0 330470 03/26/03 1,400 328,670 0 330070 03/27/03 7,500 322,570 0 330070 03/28/03 0 327,570 0 327570 03/29/03 0 327,570 0 327570 03/30/03 0 327,570 0 327570 03/31/03 0 330,570 0 330570 Attachment B Loans From Non-Utility Money Pool (Thousand of Dollars) AFS ADC AEC AED AEG AER AME CIC ERC IMS AEM UEDC AMS Total Loans Beg Bal 23,975 1,550 27,900 26,925 191,000 12,900 5,970 5,700 14,390 3,160 2,000 0 0 315470 01/01/03 23,975 1,550 27,900 26,925 191,000 12,900 5,970 5,700 14,390 3,160 2,000 0 0 315470 01/02/03 23,675 1,550 27,900 26,925 191,700 12,900 5,970 5,700 14,390 3,160 2,000 0 0 315870 01/03/03 24,475 1,450 27,900 26,925 192,500 12,900 5,970 5,700 14,390 4,360 2,600 0 0 319170 01/04/03 24,475 1,450 27,900 26,925 192,500 12,900 5,970 5,700 14,390 4,360 2,600 0 0 319170 01/05/03 24,475 1,450 27,900 26,925 192,500 12,900 5,970 5,700 14,390 4,360 2,600 0 0 319170 01/06/03 23,975 1,450 27,900 26,925 193,200 12,900 5,970 5,700 14,390 4,360 2,600 0 0 319370 01/07/03 23,675 1,450 27,900 27,125 195,100 12,900 5,970 5,700 14,390 4,360 2,600 0 0 321170 01/08/03 23,675 1,450 27,900 27,125 195,100 12,900 5,970 5,700 14,390 4,360 2,600 0 0 321170 01/09/03 21,375 1,450 27,900 27,125 197,000 12,900 5,970 5,700 14,390 4,360 2,600 0 0 320770 01/10/03 28,775 1,450 27,900 27,125 201,600 12,900 5,970 6,200 14,390 4,360 2,600 0 300 333570 01/11/03 28,775 1,450 27,900 27,125 201,600 12,900 5,970 6,200 14,390 4,360 2,600 0 300 333570 01/12/03 28,775 1,450 27,900 27,125 201,600 12,900 5,970 6,200 14,390 4,360 2,600 0 300 333570 01/13/03 15,175 1,450 27,900 27,125 204,500 12,900 6,270 6,200 14,390 4,360 2,600 0 0 322870 01/14/03 15,175 1,450 27,900 27,125 206,300 12,900 6,270 6,200 14,390 4,360 2,300 0 0 324370 01/15/03 15,175 1,450 27,900 27,125 207,200 12,900 7,270 6,200 14,390 4,360 2,500 0 0 326470 01/16/03 15,175 1,450 27,900 27,425 208,200 12,900 7,270 6,200 14,390 4,360 2,700 0 0 327970 01/17/03 16,175 1,450 27,900 27,425 209,800 12,900 7,270 6,200 14,390 4,360 1,300 0 0 329170 01/18/03 16,175 1,450 27,900 27,425 209,800 12,900 7,270 6,200 14,390 4,360 1,300 0 0 329170 01/19/03 16,175 1,450 27,900 27,425 209,800 12,900 7,270 6,200 14,390 4,360 1,300 0 0 329170 01/20/03 16,175 1,450 27,900 27,425 209,800 12,900 7,270 6,200 14,390 4,360 1,300 0 0 329170 01/21/03 16,175 1,450 27,900 27,425 211,300 12,900 7,270 6,200 14,390 4,660 0 0 0 329670 01/22/03 15,675 1,450 27,900 27,425 216,000 12,900 7,270 6,200 14,390 4,060 0 0 0 333270 01/23/03 16,475 1,450 27,900 27,425 216,300 12,900 7,270 6,200 14,390 4,160 0 0 0 334470 01/24/03 28,775 1,450 27,900 27,425 220,000 12,900 7,270 6,200 14,390 4,160 0 0 0 350470 01/25/03 28,775 1,450 27,900 27,425 220,000 12,900 7,270 6,200 14,390 4,160 0 0 0 350470 01/26/03 28,775 1,450 27,900 27,425 220,000 12,900 7,270 6,200 14,390 4,160 0 0 0 350470 01/27/03 27,475 1,450 27,900 27,425 222,000 12,900 7,270 6,200 14,390 4,160 0 0 0 351170 01/28/03 27,975 1,450 28,100 28,525 226,600 13,000 10,270 6,200 14,390 4,660 0 0 0 361170 01/29/03 25,575 1,450 28,100 27,025 188,300 9,500 7,870 6,200 15,290 4,660 4,800 0 0 318770 Attachment B - (continued) Loans From Non-Utility Money Pool (Thousand of Dollars) AFS ADC AEC AED AEG AER AME CIC ERC IMS AEM UEDC AMS Total Loans 01/30/03 25,575 1,450 28,100 27,025 189,000 9,500 7,870 6,200 15,290 4,660 4,800 300 0 319770 01/31/03 25,075 1,450 28,100 27,025 190,700 9,500 7,870 6,200 15,290 4,660 4,800 300 0 320970 02/01/03 25,075 1,450 28,100 27,025 190,700 9,500 7,870 6,200 15,290 4,660 4,800 300 0 320970 02/02/03 25,075 1,450 28,100 27,025 190,700 9,500 7,870 6,200 15,290 4,660 4,800 300 0 320970 02/03/03 22,275 1,450 28,100 27,025 199,800 9,500 7,870 6,200 15,290 4,660 4,800 300 0 327270 02/04/03 22,575 1,450 28,100 27,025 201,100 9,500 7,870 6,200 15,290 4,660 4,800 300 0 328870 02/05/03 22,575 1,450 28,100 27,025 202,400 9,500 7,870 6,200 15,290 4,660 4,800 300 0 330170 02/06/03 23,475 1,450 28,100 27,025 202,900 9,500 7,870 6,200 15,290 4,660 4,300 300 0 331070 02/07/03 23,475 1,450 28,100 27,025 205,500 9,500 7,870 6,200 15,290 4,660 4,300 300 0 333670 02/08/03 23,475 1,450 28,100 27,025 205,500 9,500 7,870 6,200 15,290 4,660 4,300 300 0 333670 02/09/03 23,475 1,450 28,100 27,025 205,500 9,500 7,870 6,200 15,290 4,660 4,300 300 0 333670 02/10/03 8,375 1,450 28,100 27,025 208,600 9,500 7,970 6,200 15,290 4,660 4,100 300 -100 321470 02/11/03 15,475 1,450 28,100 27,025 211,200 9,500 7,970 6,200 15,290 4,660 4,100 300 0 331270 02/12/03 15,475 1,450 28,100 27,025 211,500 9,500 7,970 6,200 15,290 4,660 4,100 300 0 331570 02/13/03 15,475 1,450 28,100 27,025 211,600 9,500 7,970 6,200 15,290 4,560 4,100 300 0 331570 02/14/03 15,575 1,450 28,100 27,225 213,800 9,500 7,970 6,200 15,290 4,560 4,100 300 0 334070 02/15/03 15,575 1,450 28,100 27,225 213,800 9,500 7,970 6,200 15,290 4,560 4,100 300 0 334070 02/16/03 15,575 1,450 28,100 27,225 213,800 9,500 7,970 6,200 15,290 4,560 4,100 300 0 334070 02/17/03 15,575 1,450 28,100 27,225 213,800 9,500 7,970 6,200 15,290 4,560 4,100 300 0 334070 02/18/03 15,875 1,450 28,100 27,225 214,700 9,500 7,970 6,200 15,290 4,560 2,600 300 0 333770 02/19/03 15,175 1,450 28,600 27,725 217,000 9,600 7,970 6,200 15,290 4,660 0 300 700 334670 02/20/03 15,175 1,450 28,600 27,725 220,000 9,600 7,970 6,200 15,290 4,660 0 300 0 336970 02/21/03 10,375 1,450 28,600 27,725 221,800 9,700 9,370 6,200 15,290 4,660 0 300 0 335470 02/22/03 10,375 1,450 28,600 27,725 221,800 9,700 9,370 6,200 15,290 4,660 0 300 0 335470 02/23/03 10,375 1,450 28,600 27,725 221,800 9,700 9,370 6,200 15,290 4,660 0 300 0 335470 02/24/03 17,675 1,450 28,600 27,725 222,300 9,700 9,370 6,200 15,290 4,660 0 300 0 343270 02/25/03 16,975 1,450 28,600 27,725 226,000 9,700 9,370 6,500 15,290 4,660 0 400 0 346670 02/26/03 16,675 1,450 28,600 27,725 227,500 9,700 9,370 6,500 15,290 4,660 0 400 0 347870 02/27/03 16,675 1,450 28,700 27,725 228,000 9,700 9,370 6,500 15,290 4,660 0 400 0 348470 02/28/03 16,275 1,450 28,700 27,725 229,100 9,700 9,470 6,500 15,690 4,660 0 400 0 349670 Attachment B - (continued) Loans From Non-Utility Money Pool (Thousand of Dollars) AFS ADC AEC AED AEG AER AME CIC ERC IMS AEM UEDC AMS Total Loans 03/01/03 16,275 1,450 28,700 27,725 229,100 9,700 9,470 6,500 15,690 4,660 0 400 0 349670 03/02/03 16,275 1,450 28,700 27,725 229,100 9,700 9,470 6,500 15,690 4,660 0 400 0 349670 03/03/03 13,875 1,450 28,700 27,725 231,100 9,700 9,470 6,500 15,690 4,660 0 400 0 349270 03/04/03 13,875 1,450 28,700 27,725 229,800 9,700 9,470 6,500 15,690 4,660 0 400 0 347970 03/05/03 13,875 1,450 28,700 27,725 231,100 9,700 9,470 6,500 15,690 4,660 0 400 0 349270 03/06/03 13,975 1,450 28,700 27,725 182,700 9,700 6,770 6,500 15,690 4,660 11,900 400 0 310170 03/07/03 13,975 1,450 28,700 27,825 184,800 9,700 6,770 6,500 15,690 4,660 11,900 400 0 312370 03/08/03 13,975 1,450 28,700 27,825 184,800 9,700 6,770 6,500 15,690 4,660 11,900 400 0 312370 03/09/03 13,975 1,450 28,700 27,825 184,800 9,700 6,770 6,500 15,690 4,660 11,900 400 0 312370 03/10/03 13,975 1,450 28,700 27,825 185,000 9,700 6,770 6,500 15,690 4,660 11,700 400 0 312370 03/11/03 21,575 1,450 28,700 27,825 189,100 9,700 6,770 6,500 15,690 4,660 11,700 400 0 324070 03/12/03 21,575 1,450 28,700 27,825 189,600 9,700 6,770 6,500 15,690 4,660 11,700 400 0 324570 03/13/03 8,975 1,450 28,700 27,825 192,900 9,700 6,770 6,500 15,690 4,660 11,500 400 0 315070 03/14/03 9,775 1,450 28,700 27,825 194,400 9,700 7,570 6,500 15,690 4,660 11,800 400 0 318470 03/15/03 9,775 1,450 28,700 27,825 194,400 9,700 7,570 6,500 15,690 4,660 11,800 400 0 318470 03/16/03 9,775 1,450 28,700 27,825 194,400 9,700 7,570 6,500 15,690 4,660 11,800 400 0 318470 03/17/03 9,375 1,450 28,700 27,825 195,500 9,700 7,570 6,600 15,690 4,660 10,100 400 0 317570 03/18/03 9,375 1,450 28,700 27,825 196,500 9,700 7,570 6,600 15,690 4,660 10,100 400 0 318570 03/19/03 9,375 1,450 28,700 27,825 197,700 9,700 7,570 6,600 15,690 4,660 10,100 400 0 319770 03/20/03 9,375 1,450 28,700 27,825 198,100 9,700 7,570 6,600 15,690 4,660 7,100 400 0 317170 03/21/03 16,675 1,450 28,700 27,825 205,500 9,700 7,570 6,600 15,690 4,660 2,600 400 0 327370 03/22/03 16,675 1,450 28,700 27,825 205,500 9,700 7,570 6,600 15,690 4,660 2,600 400 0 327370 03/23/03 16,675 1,450 28,700 27,825 205,500 9,700 7,570 6,600 15,690 4,660 2,600 400 0 327370 03/24/03 16,075 1,450 28,700 27,825 209,800 9,700 7,570 6,600 15,690 4,660 0 400 0 328470 03/25/03 16,675 1,450 28,700 27,825 211,000 9,700 7,570 6,600 15,690 4,660 200 400 0 330470 03/26/03 15,775 1,450 28,700 27,825 211,700 9,700 7,570 6,600 15,690 4,660 0 400 0 330070 03/27/03 15,775 1,450 28,700 27,825 212,600 9,700 7,570 5,700 15,690 4,660 0 400 0 330070 03/28/03 14,375 1,450 29,000 28,025 168,200 36,200 8,370 5,700 15,690 4,660 15,500 400 0 327570 03/29/03 14,375 1,450 29,000 28,025 168,200 36,200 8,370 5,700 15,690 4,660 15,500 400 0 327570 03/30/03 14,375 1,450 29,000 28,025 168,200 36,200 8,370 5,700 15,690 4,660 15,500 400 0 327570 03/31/03 14,375 1,450 29,000 28,025 169,500 36,200 8,370 5,700 15,690 4,660 17,200 400 0 330570 Attachment C Calculates net interest on contributors and borrowers 01/01/03 8.8399% 01/02/03 8.8399% 01/03/03 8.8399% 01/04/03 8.8399% 01/05/03 8.8399% 01/06/03 8.8399% 01/07/03 8.8399% 01/08/03 8.8399% 01/09/03 8.8399% 01/10/03 8.8399% 01/11/03 8.8399% 01/12/03 8.8399% 01/13/03 8.8399% 01/14/03 8.8399% 01/15/03 8.8399% 01/16/03 8.8399% 01/17/03 8.8399% 01/18/03 8.8399% 01/19/03 8.8399% 01/20/03 8.8399% 01/21/03 8.8399% 01/22/03 8.8399% 01/23/03 8.8399% 01/24/03 8.8399% 01/25/03 8.8399% 01/26/03 8.8399% 01/27/03 8.8399% 01/28/03 8.8399% 01/29/03 8.8399% 01/30/03 8.8399% 01/31/03 8.8399% 02/01/03 8.8399% 02/02/03 8.8399% 02/03/03 8.8399% 02/04/03 8.8399% 02/05/03 8.8399% 02/06/03 8.8399% 02/07/03 8.8399% 02/08/03 8.8399% 02/09/03 8.8399% 02/10/03 8.8399% 02/11/03 8.8399% 02/12/03 8.8399% 02/13/03 8.8399% 02/14/03 8.8399% 02/15/03 8.8399% 02/16/03 8.8399% 02/17/03 8.8399% Attachment C - (continued) Calculates net interest on contributors and borrowers 02/18/03 8.8399% 02/19/03 8.8399% 02/20/03 8.8399% 02/21/03 8.8399% 02/22/03 8.8399% 02/23/03 8.8399% 02/24/03 8.8399% 02/25/03 8.8399% 02/26/03 8.8399% 02/27/03 8.8399% 02/28/03 8.8399% 03/01/03 8.8399% 03/02/03 8.8399% 03/03/03 8.8399% 03/04/03 8.8399% 03/05/03 8.8399% 03/06/03 8.8399% 03/07/03 8.8399% 03/08/03 8.8399% 03/09/03 8.8399% 03/10/03 8.8399% 03/11/03 8.8399% 03/12/03 8.8399% 03/13/03 8.8399% 03/14/03 8.8399% 03/15/03 8.8399% 03/16/03 8.8399% 03/17/03 8.8399% 03/18/03 8.8399% 03/19/03 8.8399% 03/20/03 8.8399% 03/21/03 8.8399% 03/22/03 8.8399% 03/23/03 8.8399% 03/24/03 8.8399% 03/25/03 8.8399% 03/26/03 8.8399% 03/27/03 8.8399% 03/28/03 8.8399% 03/29/03 8.8399% 03/30/03 8.8399% 03/31/03 8.8399%