EXHIBIT 99.(A)(1)(V) IMMEDIATE ATTENTION REQUIRED March 6, 2000 RE: TRIGEN ENERGY CORPORATION 401K PLAN Dear Plan Participant: Our records reflect that as a participant in the plan above (the "Plan"), your profit sharing account is invested in the TRIGEN Company Stock Fund. It has come to our attention that a subsidiary of Suez Lyonnaise Des Eaux has initiated an offer to purchase any and all outstanding shares of common stock of Trigen Energy Corporation. As described below, you have the right to instruct Fidelity Management Trust Company ("Fidelity"), as trustee of the Plan, concerning whether to tender the shares of Trigen Energy Corporation credited to your individual account under the Plan. Enclosed are tender offer materials and a Direction Form that require your immediate attention. These materials describe an offer to purchase any and all shares of common stock of Trigen Energy Corporation for $23.50 per share. YOU WILL NEED TO COMPLETE THE ENCLOSED DIRECTION FORM AND RETURN IT TO FIDELITY INSTITUTIONAL RETIREMENT SERVICES COMPANY IN THE ENCLOSED RETURN ENVELOPE SO THAT IT IS RECEIVED BY 12:00 MIDNIGHT, EASTERN TIME, ON MARCH 21, 2000, UNLESS THE OFFER IS EXTENDED. PLEASE COMPLETE AND RETURN THE ENCLOSED DIRECTION FORM EVEN IF YOU DECIDE NOT TO PARTICIPATE IN THE TENDER OFFER DESCRIBED BELOW. NO FACSIMILE TRANSMITTALS OF THE TRUSTEE DIRECTION FORM WILL BE ACCEPTED. The remainder of this letter summarizes the transaction, your rights under the Plan and the procedures for completing the Direction Form. You should also review the more detailed explanation provided in the other materials enclosed with this letter, including the Offer to Purchase and the related Letter of Transmittal. BACKGROUND Suez Lyonnaise Des Eaux, through its wholly owned subsidiaries Elyo and T Acquisition Corp (the "Purchaser"), has made a tender offer to purchase all outstanding shares of common stock of Trigen Energy Corporation (the "Shares"), at a price of $23.50 per Share, without interest. The enclosed Offer to Purchase dated February 28, 2000 (the "Offer to Purchase") and the enclosed Letter of Transmittal, set forth the objectives, terms and conditions of the tender offer (the "Offer") and are being provided to all of the Company's shareholders. Also enclosed is the Company's Schedule 14D-9. The Purchaser's Offer to Purchase extends to the Shares held by the Plan. As of February 28, 2000, the Plan held approximately 106,798 Shares. Only Fidelity, as trustee of the Plan, can tender these Shares in the Offer. Nonetheless, as a participant under the Plan, you have the right to direct Fidelity whether or not to tender some or all of the Shares credited to your individual account in the Plan. Unless otherwise required by applicable law, Fidelity will tender Shares credited to participant accounts in accordance with participant instructions and Fidelity will not tender Shares credited to participant accounts for which it does not receive timely instructions. IF YOU DO NOT COMPLETE THE ENCLOSED DIRECTION FORM AND RETURN IT TO FIDELITY ON A TIMELY BASIS, YOU WILL BE DEEMED TO HAVE ELECTED NOT TO PARTICIPATE IN THE OFFER AND NO SHARES CREDITED TO YOUR PLAN ACCOUNT WILL BE TENDERED IN THE OFFER. A tender of Shares credited to your individual account under the Plan can be made only by Fidelity as the holder of record. DO NOT COMPLETE THE LETTER OF TRANSMITTAL; IT IS FURNISHED TO YOU FOR YOUR INFORMATION ONLY AND CANNOT BE USED BY YOU TO TENDER DIRECTLY SHARES CREDITED TO YOUR INDIVIDUAL ACCOUNT UNDER THE PLAN. IF YOU WISH TO DIRECT FIDELITY CONCERNING THE TENDER OF YOUR SHARES IN THE PLAN, YOU MUST COMPLETE AND RETURN THE ENCLOSED DIRECTION FORM. FIDELITY MAKES NO RECOMMENDATION AS TO WHETHER TO DIRECT THE TENDER OF SHARES OR WHETHER TO REFRAIN FROM DIRECTING THE TENDER OF SHARES. EACH PARTICIPANT MUST MAKE HIS OR HER OWN DECISION ON THESE MATTERS. CONFIDENTIALITY TO ASSURE THE CONFIDENTIALITY OF YOUR DECISION, FIDELITY AND ITS AFFILIATES OR AGENTS WILL TABULATE THE DIRECTION FORMS. NEITHER FIDELITY NOR ITS AFFILIATES OR AGENTS WILL MAKE THE RESULTS OF YOUR INDIVIDUAL DIRECTION AVAILABLE TO THE PURCHASER OR THE COMPANY. PROCEDURE FOR DIRECTING TRUSTEE A Direction Form for making your direction is enclosed. Please note that on the reverse side of the Direction Form the number of Shares credited to your individual account as of February 28, 2000 is indicated to the right of your address. For purposes of the final tabulation, Fidelity will apply your instructions to the number of Shares credited to your account as of March 20, 2000 or as of a later date if the Offer is extended. If the Purchaser extends the Offer and there is sufficient time, Fidelity will mail a letter advising you of the new deadline for participants to return Direction Forms. If you do not properly complete the Direction Form or do not return it by the deadline specified, unless the Offer is extended, such Shares will be considered NOT TENDERED. To properly complete your Direction Form, you must do the following: (1) On the face of the Direction Form, check Box 1, 2 or 3. CHECK ONLY ONE BOX: o CHECK BOX 1 if you want ALL of the Shares credited to your individual account tendered for sale in accordance with the terms of the Offer. o CHECK BOX 2 if you want to TENDER A PORTION of the Shares credited to your individual account. SPECIFY THE PERCENTAGE (in whole numbers) of Shares credited to your individual account that you want to tender for sale in accordance with the terms of this Offer. IF THIS AMOUNT IS LESS THAN 100%, YOU WILL BE DEEMED TO HAVE INSTRUCTED FIDELITY NOT TO TENDER THE BALANCE OF THE SHARES CREDITED TO YOUR INDIVIDUAL ACCOUNT UNDER THE PLAN. o CHECK BOX 3 if you do not want the Shares credited to your individual account tendered for sale in accordance with the terms of the Offer and simply want the Plan to continue holding such Shares. (2) Date and sign the Direction Form in the space provided. (3) Return the Direction Form in the enclosed return envelope so that it is received by Fidelity at the address on the return envelope (P.O. Box 9142, Hingham, MA 02043) not later than 12:00 Midnight, Eastern time, on March 21, 2000, unless the Offer is extended. If you wish to return the form by overnight mail, please send it to Fidelity's tabulation agent, Management Information Services, at 61 Accord Park Drive, Norwell, MA 02061. NO FACSIMILE TRANSMITTALS OF THE TRUSTEE DIRECTION FORM WILL BE ACCEPTED. Your direction will be deemed irrevocable unless withdrawn by 12:00 Midnight, Eastern time, on March 21, 2000, unless the Offer is extended. In order to make an effective withdrawal, you must submit a new Direction Form which may be obtained by calling Fidelity at 1-800-835-5098. Your new Direction Form must include your name, address and Social Security number. Upon receipt of a new, completed and signed Direction Form, your previous direction will be deemed canceled. You may direct the re-tendering of any Shares credited to your individual account by obtaining an additional Direction Form from Fidelity and repeating the previous instructions for directing tenders as set forth in this letter. After the deadline above for returning the Direction Form to Fidelity, Fidelity and its affiliates or agents will complete the tabulation of all directions and Fidelity, as trustee, will tender the appropriate number of Shares. Unless the Offer is terminated or amended in accordance with its terms, the Purchaser will then buy all outstanding Shares that were tendered. EFFECT OF TENDER ON YOUR ACCOUNT Due to the closing of the Offer, as of 4:00 p.m., Eastern Time, on March 16, 2000, the TRIGEN Company Stock Fund in the Plan will be frozen. All distributions from balances in Shares will be frozen after that time. However, balances in Shares will be utilized to calculate amounts eligible for distributions, loans and withdrawals throughout the freeze. For any Shares in the Plan that are tendered and purchased by the Purchaser, the Purchaser will pay cash, without interest, to the Plan. INDIVIDUAL PARTICIPANTS IN THE PLAN WILL NOT, HOWEVER, RECEIVE ANY CASH TENDER PROCEEDS DIRECTLY. ALL SUCH PROCEEDS WILL REMAIN IN THE PLAN AND MAY BE WITHDRAWN ONLY IN ACCORDANCE WITH THE TERMS OF THE PLAN. Fidelity will invest proceeds with respect to Shares credited to your account in the Dreyfus Cash Management Plus Fund as soon as administratively possible after receipt of proceeds. You may call Fidelity at 1-800-835-5098 after the reinvestment is complete to learn the effect of the tender on your account or to exchange the proceeds of the sale of Shares from the Dreyfus Cash Management Plus Fund into other investment options offered under the Plan. Fidelity will complete processing as soon as administratively possible. Fidelity anticipates that the processing will be completed five to seven business days after receipt of proceeds from the Purchaser. As described in the Offer, in the event the tender offer is completed, the Offer will likely be followed by a merger and all remaining Shares of the Company will be converted into the right to receive $23.50 per Share in cash, without interest. At that time, Shares for which Fidelity received directions not to tender or for which Fidelity did not receive directions by March 21, 2000, will be canceled. Fidelity will receive $23.50 for each Share, and these proceeds will be invested in the Dreyfus Cash Management Plus Fund, pending participant investment decisions. SHARES OUTSIDE THE PLAN If you hold Shares directly, you will receive, under separate cover, tender offer materials directly from the Purchaser which can be used to tender such Shares directly to the Purchaser. THOSE TENDER OFFER MATERIALS MAY NOT BE USED TO DIRECT FIDELITY TO TENDER OR NOT TENDER THE SHARES CREDITED TO YOUR INDIVIDUAL ACCOUNT UNDER THE PLAN. The direction to tender or not tender Shares credited to your individual account under the Plan may only be made in accordance with the procedures in this letter. Similarly, the enclosed Direction Form may not be used to tender non-Plan Shares. FURTHER INFORMATION If you require additional information concerning the procedure to tender Shares credited to your individual account under the Plan, please contact Fidelity at 1-800-835-5098. If you require additional information concerning the terms and conditions of the Offer, please call Morrow and Co., Inc., the Information Agent, at 1-800-566-9061. Sincerely, Fidelity Management Trust Company