SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE TO (RULE 14D-100) TENDER OFFER STATEMENT UNDER SECTION 14(D)(1) OR 13(E)(1) OF THE SECURITIES EXCHANGE ACT OF 1934. (AMENDMENT NO. 4 -- FINAL AMENDMENT) - --------------------------------------------------------------------------- TRIGEN ENERGY CORPORATION - --------------------------------------------------------------------------- (Name of Subject Company (Issuer)) T ACQUISITION CORP. (OFFEROR) ELYO SUEZ LYONNAISE DES EAUX TRIGEN ENERGY CORPORATION - --------------------------------------------------------------------------- (Names of Filing Persons (identifying status as offeror, issuer or other person)) COMMON STOCK, $0.01 PAR VALUE - --------------------------------------------------------------------------- (Title of Class of Securities) 895930105 - --------------------------------------------------------------------------- (CUSIP Number of Class of Securities) MICHEL BLEITRACH ELYO 235 AVENUE GEORGES CLEMENCEAU BP 4601 92746 NANTERRE CEDEX, FRANCE 011-331-41-20-10-10 WITH A COPY TO: JEFFREY BAGNER FRIED, FRANK, HARRIS, SHRIVER & JACOBSON ONE NEW YORK PLAZA NEW YORK, NEW YORK 10004-1980 (212) 859-8000 - --------------------------------------------------------------------------- (Name, address, and telephone numbers of person authorized to receive notices and communications on behalf of filing persons) CALCULATION OF FILING FEE - --------------------------------------------------------------------------- Transaction Valuation* $173,487,223 Amount Of Filing Fee $34,698 - --------------------------------------------------------------------------- * ESTIMATED FOR PURPOSES OF CALCULATING THE AMOUNT OF THE FILING FEE ONLY. THIS AMOUNT ASSUMES THE PURCHASE OF 7,382,435 SHARES OF COMMON STOCK, PAR VALUE $.01 PER SHARE (THE "SHARES"), OF TRIGEN ENERGY CORPORATION, A DELAWARE CORPORATION (THE "COMPANY"), AT THE TENDER PRICE OF $23.50 PER SHARE NET TO THE SELLER IN CASH, WITHOUT INTEREST THEREON. PURSUANT TO THE AGREEMENT AND PLAN OF MERGER, DATED AS OF JANUARY 19, 2000, AMONG ELYO ("PARENT"), T ACQUISITION CORP. AND THE COMPANY, THE COMPANY REPRESENTED THAT AS OF SUCH DATE, IT HAD 12,416,297 SHARES OUTSTANDING AND 849,210 SHARES RESERVED FOR ISSUANCE UPON EXERCISE OF ALL OUTSTANDING OPTIONS UNDER THE COMPANY'S EMPLOYEE BENEFIT PLANS. PARENT ALREADY BENEFICIALLY OWNS 6,507,944 SHARES, OF WHICH THE 1,637,274 SHARES HELD BY COMPAGNIE PARISENNE DE CHAUFFAGE URBAIN ("CPCU"), A NON-WHOLLY-OWNED SUBSIDIARY OF PARENT, WILL BE TENDERED. PARENT HAS SEPARATELY AGREED TO PURCHASE 1,012,402 SHARES FROM THOMAS R. CASTEN ON MARCH 29, 2000, PURSUANT TO A PURCHASE AGREEMENT, DATED JANUARY 19, 2000 BETWEEN PARENT AND MR. CASTEN. BASED ON THE FOREGOING, THE TRANSACTION VALUE IS EQUAL TO THE PRODUCT OF (I) (A) 12,416,297 SHARES (THE NUMBER OF SHARES OUTSTANDING), PLUS (B) 849,210 SHARES (THE NUMBER OF SHARES RESERVED FOR ISSUANCE UPON EXERCISE OF OPTIONS), MINUS (C) THE DIFFERENCE OF (1) 6,507,944 (THE NUMBER OF SHARES BENEFICIALLY OWNED BY PARENT) MINUS (2) 1,637,274 (THE NUMBER OF SHARES HELD BY CPCU BEING TENDERED), MINUS (D) 1,012,402 (THE NUMBER OF SHARES HELD BY MR. CASTEN), MULTIPLIED BY (II) $23.50. THE AMOUNT OF THE FILING FEE, CALCULATED IN ACCORDANCE WITH RULE 0-11 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED, EQUALS 1/50 OF ONE PERCENT OF THE AGGREGATE OF THE CASH OFFERED BY THE BIDDER. [x] CHECK THE BOX IF ANY PART OF THE FEE IS OFFSET AS PROVIDED BY RULE 0-11(A)(2) AND IDENTIFY THE FILING WITH WHICH THE OFFSETTING FEE WAS PREVIOUSLY PAID. IDENTIFY THE PREVIOUS FILING BY REGISTRATION STATEMENT NUMBER, OR THE FORM OR SCHEDULE AND THE DATE OF ITS FILING. Amount Previously Paid: $34,698 Form or Registration No.: Schedule TO-T Filing Party: T Acquisition Corp., Elyo, Suez Lyonnaise des Eaux Date Filed: February 28, 2000 [ ] Check the box if the filing relates solely to preliminary communications made before the commencement of a tender offer. Check the appropriate boxes below to designate any transactions to which the statement relates: [x] third-party tender offer subject to Rule 14d-1. [ ] issuer tender offer subject to Rule 13e-4. [x] going-private transaction subject to Rule 13e-3. [x] amendment to Schedule 13D under Rule 13d-2. Check the following box if the filing is a final amendment reporting the results of the tender offer: [x] INTRODUCTION This Amendment No. 4 (this "Amendment") amends and supplements the Tender Offer Statement on Schedule TO filed with the Securities and Exchange Commission on February 28, 2000, as amended, by T Acquisition Corp., a Delaware corporation ("Purchaser"), Elyo, a societe anonyme organized and existing under the laws of the Republic of France ("Parent"), Suez Lyonnaise des Eaux, a societe anonyme organized and existing under the laws of the Republic of France ("Suez") and Trigen Energy Corporation, a Delaware corporation (the "Company"). The Schedule TO relates to the offer to purchase any and all outstanding shares of Common Stock, par value $.01 per share, of the Company, at a purchase price of $23.50 per share, net to the seller in cash, without interest, upon the terms and subject to the conditions set forth in the Offer to Purchase dated February 28, 2000 (the "Offer to Purchase"), and in the related Letter of Transmittal (which, together with any amendments or supplements thereto, collectively constitute the "Offer"), copies of which are filed as Exhibits (a)(1)(i) and (a)(1)(ii) hereto, respectively, and which are incorporated herein by reference. Capitalized terms used and not defined herein shall have the meanings assigned to such terms in the Offer to Purchase and the Schedule TO. This Amendment also amends the Schedule 13D, as previously amended, of Suez, Parent, Cofreth American Corporation and Compagnie Parisienne de Chauffage Urbain filed with the Securities and Exchange Commission on September 30, 1996. ITEM 8. Interest in Securities of the Subject Company. Item 8 is hereby amended by adding the following: At 12:00 midnight, New York City time on Friday, March 29, 2000, the Subsequent Offering Period expired. Based on information provided by the Depositary, approximately 23,037 Shares were validly tendered during the Subsequent Offering Period. Purchaser has accepted for payment all such Shares at the Offer Price of $23.50, net to the seller in cash, without interest thereon. Purchaser has acquired an aggregate of 6,090,379 Shares in the Offer, comprised of 6,067,342 shares that were tendered in the initial offering period and 23,037 Shares that were tendered in the Subsequent Offering Period. After giving effect to the results of the initial offering period and the Subsequent Offering Period, Parent presently beneficially owns approximately 11,914,265 Shares, or approximately 96% of the total Shares outstanding. SIGNATURE After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. T ACQUISITION CORP. By: /s/ Michel Bleitrach --------------------------------- Name: Michel Bleitrach Title: President ELYO By: /s/ Michel Bleitrach --------------------------------- Name: Michel Bleitrach Title: Chief Executive Officer SUEZ LYONNAISE DES EAUX By: /s/ M. Patrice Herbet --------------------------------- Name: M. Patrice Herbet* Title: Authorized Representative TRIGEN ENERGY CORPORATION By: /s/ Eugene E. Murphy --------------------------------- Name: Eugene E. Murphy Title: Vice President, General Counsel and Secretary Dated: April 4, 2000 - ----------------------- * A Power of Attorney authorizing M. Patrice Herbet to sign on behalf of Suez Lyonnaise des Eaux is filed herewith as Exhibit (i). EXHIBIT INDEX EXHIBIT NUMBER TITLE ------------ ----- (a)(1)(i) Offer to Purchase, dated February 28, 2000.* (a)(1)(ii) Letter of Transmittal.* (a)(1)(iii) Notice of Guaranteed Delivery.* (a)(1)(iv) Letter to Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees.* (a)(1)(v) Notice to the Company 401k Plan Participants from Fidelity Management Trust Company.* (a)(1)(vi) Solicitation/Recommendation Statement on Schedule 14D-9, dated February 28, 2000 (incorporated by reference to the Company's Schedule 14D-9 filed with the Commission on February 28, 2000). (a)(2) Letter to stockholders from Richard E. Kessel, President and Chief Executive Officer of the Company.* (a)(3) Exhibit (a)(1)(i) is incorporated herein by reference. (a)(4) Not applicable. (a)(5)(i) Letter from Brokers, Dealers, Commercial Banks, Trust Companies and Other Nominees to Clients.* (a)(5)(ii) Guidelines for Certification of Taxpayer Identification Number on Substitute Form W-9.* (a)(5)(iii) Agreement and Plan of Merger dated as of January 19, 2000, among Elyo, T Acquisition Corp. and the Company.* (a)(5)(iv) Audited financial statements for the Company's 1998 and 1997 fiscal years, beginning on page F-1 of the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 1998 (incorporated by reference to the Company's Annual Report on Form 10-K filed with the Commission on March 31, 1999). (a)(5)(v) Pages 1 through 8, inclusive, of the Company's Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 1999 (incorporated by reference to the Company's Quarterly Report on Form 10-Q filed with the Commission on November 12, 1999). (a)(5)(vi) Audited financial statements for Grays Ferry Cogeneration Partnership 1998 and 1997 fiscal years, set forth on Exhibit 99 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 1998 (incorporated by reference to the Company's Annual Report on Form 10-K filed with the Commission on March 31, 1999). (a)(5)(vii) Joint Press Release, dated January 19, 2000.* (a)(5)(viii) Joint Press Release, dated February 28, 2000.* (a)(5)(ix) Joint Press Release, dated March 17, 2000.* (a)(5)(x) Press Release issued by Elyo, dated March 27, 2000.* (b) Not applicable. (c)(i) Summary Presentation prepared for Parent by Lazard Freres & Co., LLC, dated January 19, 2000.* (c)(ii) Written Presentation prepared for the Special Committee by Credit Suisse First Boston Corporation, dated January 19, 2000.* (c)(iii) Opinion of Credit Suisse First Boston Corporation, dated January 19, 2000 (incorporated by reference from Annex A of the Solicitation/Recommendation Statement on Schedule 14D-9 of the Company, dated February 28, 2000).* (d)(i) Tender and Voting Agreement dated as of January 19, 2000, among Elyo, T Acquisition Corp. and the Stockholders.* (d)(ii) Letter Agreement between Thomas R. Casten and Elyo, dated January 19, 2000.* (d)(iii) Separation Agreement and Release dated as of January 19, 2000, between Trigen Energy Corporation and Thomas R. Casten.* (f) Section 262 of the Delaware General Corporation Law (included as Schedule II to the Offer to Purchase filed herewith as Exhibit (a)(1)(i)).* (g) Not applicable. (h) Not applicable. (i)(i) Power of Attorney, dated October 27, 1998.* (i)(ii) Power of Attorney, dated October 27, 1998 (English translation).* - ------------------- * Previously filed