EXHIBIT 10.16.4 FOURTH AMENDMENT TO THE RATE AGREEMENT THIS FOURTH AMENDATORY AGREEMENT dated as of the date last written below is between the parties to the agreement dated as of November 22, 1989, as amended by the First Amendatory Agreement dated as of December 5, 1989, the Second Amendatory Agreement dated as of December 12, 1989, and the Third Amendatory Agreement dated as of December 28, 1993 (the "Rate Agreement") between Northeast Utilities Service Company, acting on behalf of its parent Northeast Utilities, and the Governor and Attorney General of the State of New Hampshire, acting on behalf of the State of New Hampshire (the "State"). WHEREAS, the parties desire to amend the Rate Agreement in the respects specified below, and the Attorney General is authorized to act for the State in agreeing to such amendments. NOW, THEREFORE, in consideration of the mutual agreement below, the Parties agree as follows: I. By Report and Order No. 21,090 in Dockets DR 93-092 and DE 93-114, North Atlantic Energy Corporation (NAEC) was granted permission to purchase and acquire an ownership interest in Seabrook Station Unit I from the Vermont Electric Generation and Transmission Cooperative, Inc. Pursuant to the same order, the Commission accepted a recommendation to approve PSNH's decision to enter into a unit power sales contract with NAEC under which PSNH would purchase the output of this new ownership interest from NAEC. These approvals were conditioned upon there being no change in rates paid by customers of PSNH under base assumptions. The transfer of ownership was completed on February 15, 1994. II. In order to accomplish the objective of generating no increase in base rates due to the newly acquired interest in Seabrook, the "BA" assumptions under the Exhibit C, Schedule 1 of the Rate Agreement, as amended, need to be recalculated. A change to the "BA" assumptions necessitates an amendment to the Rate Agreement. The Parties hereby agree that the Rate Agreement is amended so that base rates reflect the "BA" figures which are depicted in Schedule A to this Fourth Amendment. This Fourth Amendment is subject to the approval of the New Hampshire Public Utilities Commission under Paragraph 17 of the Rate Agreement. III. This Fourth Amendment is executed by the parties subject to the approval of PSNH creditors and the New Hampshire Public Utilities Commission. IN WITNESS WHEREOF, each of the Parties has duly executed this Fourth Amendatory Agreement as of the day and year first above written. NORTHEAST UTILITIES SERVICE COMPANY By /s/ John J. Roman Date: 9-9-94 THE STATE OF NEW HAMPSHIRE Jeffrey R. Howard Attorney General By /s/ Wynn E. Arnold, Assistant Attorney General Date: 9-21-94 SCHEDULE A PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE RESTATEMENT OF THE FPPAC BA FACTOR REFLECTING EFFECT OF VEG&T ENTITLEMENT (1) 1994 Updated, Restated 1994 Calculation of BA Change Costs Using Act. (2) Updated, Restated for Effect of the VEG&T NAEC Capital Adjust for Reflecting Seabrook Entitlement Structure VEG&T VEG&T - ----------------------------------------------------------------------------- - - Energy costs for own generating units, purchases and sales of energy in Accounts 501, 518, 547 and 555 103,285 103,285 Small power producer costs net of amortizations 109,767 109,767 Seabrook Power Contract, non energy 133,419 1,352 134,771 NHEC buyback agreement costs, non energy 7,864 7,864 NU to NUNH slice transfer of capacity - 0 Costs of Sharing Agreement and NEPOOL (24,937) (24,937) - ---------------------------------------------------------------------------- Total Amount - ENf 329,398 1,352 330,750 Total Amount - PCf - - - Total Amount - EA - - - - ---------------------------------------------------------------------------- Total Costs 329,398 1,352 330,750 ============================================================================ Total system requirements - kWh Req. 8,511,000 8,511,000 Delivery Efficiency - DE .930233 .930233 - ---------------------------------------------------------------------------- Net system sales 7,917,213 7,917,213 ============================================================================ Base Factor - BA ($/KWh) $ .04161 $ .04178 ============================================================================ (1) As filed in Docket DR 92-165 (2) Reflects the impact of the VEG&T entitlement on Joint Dispatch Savings and the prospective level of Seabrook Nuclear Property Tax approved by the State in House Bill 53 on April 16, 1993. SCHEDULE A PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE RESTATEMENT OF THE FPPAC BA FACTOR REFLECTING EFFECT OF VEG&T ENTITLEMENT (1) 1995 Updated, Restated 1995 Calculation of BA Change Costs Using Act. (2) Updated, Restated for Effect of the VEG&T NAEC Capital Adjust Reflecting Seabrook Entitlement Structure for VEG&T VEG&T - ----------------------------------------------------------------------------- Energy costs for own generating units, purchases and sales of energy in Accounts 501, 518, 547 and 555 124,292 124,292 Small power producer costs net of amortizations 116,190 116,190 Seabrook Power Contract, non energy 147,284 1,268 148,552 NHEC buyback agreement costs, non energy 8,625 8,625 NU to NUNH slice transfer of capacity - 0 Costs of Sharing Agreement and NEPOOL (20,301) (20,301) Total Amount - ENf 376,090 1,268 377,358 Total Amount - PCf - - - Total Amount - EA - - - - ----------------------------------------------------------------------------- Total Costs 376,090 1,268 377,358 ============================================================================= Total system requirements - kWh Req. 8,751,000 8,751,000 Delivery Efficiency - DE .930233 .930233 - ----------------------------------------------------------------------------- Net system sales 8,140,469 8,140,469 ============================================================================= Base Factor - BA ($/KWh) $ .04620 $ .04636 ============================================================================= (1) As filed in Docket DR 92-165 (2) Reflects the impact of the VEG&T entitlement on Joint Dispatch Savings and the prospective level of Seabrook Nuclear Property Tax approved by the State in House Bill 53 on April 16, 1993. SCHEDULE A PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE RESTATEMENT OF THE FPPAC BA FACTOR REFLECTING EFFECT OF VEG&T ENTITLEMENT (1) 1996 Updated, Restated 1996 Calculation of BA Change Costs Using Act. (2) Updated, Restated for Effect of the VEG&T NAEC Capital Adjust for Reflecting Seabrook Entitlement Structure VEG&T VEG&T - --------------------------------------------------------------------------- Energy costs for own generating units, purchases and sales of energy in Accounts 501, 518, 547 and 555 145,862 145,862 Small power producer costs net of amortizations 122,602 122,602 Seabrook Power Contract, non energy 154,211 1,119 155,330 NHEC buyback agreement costs, non energy 10,019 10,019 NU to NUNH slice transfer of capacity - 0 Costs of Sharing Agreement and NEPOOL (20,204) (20,204) - -------------------------------------------------------------------------- Total Amount - ENf 412,490 1,119 413,609 Total Amount - PCf - - - Total Amount - EA - - - - -------------------------------------------------------------------------- Total Costs 412,490 1,119 413,609 ========================================================================== Total system requirements - kWh Req. 8,974,000 8,974,000 Delivery Efficiency - DE .930233 .930233 - -------------------------------------------------------------------------- Net system sales 8,347,911 8,347,911 ========================================================================= Base Factor - BA ($/KWh) $ .04941 $ .04955 ========================================================================= (1) As filed in Docket DR 92-165 (2) Reflects the impact of the VEG&T entitlement on Joint Dispatch Savings and the prospective level of Seabrook Nuclear Property Tax approved by the State in House Bill 53 on April 16, 1993.