Document:

Amendment to Stock Purchase Agreement

 Exhibit 10.50 
  
 EXELON SHC, INC. 
 EXELON NEW ENGLAND POWER MARKETING, L.P. 
 c/o Exelon Generation Company, LLC 
 300 Exelon Way 
 Kennett Square, PA 19348 
  
 January 31, 2005 
  
 Dynegy New York Holdings Inc. 
 c/o Dynegy Inc.

 1000 Louisiana Street, Suite 5800 
 Houston, TX 77002

 Attention: Alec G. Dryer 
  
 ExRes SHC, Inc. 
 335 Madison Avenue 
 18th Floor 
 New York, NY 10017 
 Attention: Todd Cutler 
  

	Re:	Amendment of Stock Purchase Agreement 

  
 Gentlemen: 
  
 Reference is made to that certain Stock Purchase Agreement, dated as of November 1, 2004, as amended by those certain letter agreements dated December 2, 2004 and December 31, 2004 (the “SPA”), in each case
by and among Exelon SHC, Inc., Exelon New England Power Marketing, L.P., Dynegy New York Holdings Inc. and ExRes SHC, Inc. Capitalized terms used herein without definition shall have the definitions given such terms in the SPA. 
  
 A. Amendment to Schedules. ExRes, Buyer and Selling Stockholders
desire to amend certain Schedules to the SPA as follows: 
  
 1.
Amendment of Schedule 1.1(a)(5). Schedule 1.1(a)(5) to the SPA is hereby amended to delete in its entirety the language in the second bullet on Schedule 1.1(a)(5) regarding the assignment of the Grandfathered Independence TCC and replace such
language with the following new language: 
  

	“•	 Assignment of the Grandfathered Independence TCC by Sithe and its Subsidiaries to Exelon Generation or any its Affiliates and release by NIMO of Independence from
all further obligations and liabilities thereunder and otherwise on terms reasonably satisfactory to Exelon Generation and Buyer or the creation of the 

  

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TCC “back to back” agreement (or alternative arrangements economically neutral to Sithe and its Subsidiaries on terms reasonably satisfactory to
Exelon Generation and Buyer);” 
  
 2. Amendment of
Schedule 1.1(a)(8). Schedule 1.1(a)(8) of to the SPA is hereby amended to replace the name “Peter Furniss” listed as Item 4 of Schedule 1.1(a)(8) with the name “Marsha Bronson” as the new person listed as Item 4 of Schedule
1.1(a)(8). 
  
 3. Amendment of Schedule 3.3. Schedule 3.3
to the SPA is hereby amended to delete in its entirety item number 6 of Schedule 3.3. 
  
 4. Amendment of Schedule 3.7. Schedule 3.7 to the SPA is hereby amended to add the contracts set forth on Schedule 3.7A attached hereto. 
  
 5. Amendment of Schedule 3.9(c). Schedule 3.9(c) to the SPA is hereby deleted in its entirety and replaced with
Schedule 3.9(c) attached hereto. 
  
 6. Amendment of Schedules
to Section 3.12. The Schedules to Section 3.12 of the SPA are hereby amended to add the contracts and instruments set forth on Schedule 3.12A attached hereto. 
  
 7. Amendment of Schedule 3.14. Schedule 3.14 to the SPA is hereby deleted in its entirety and replaced with Schedule
3.14 attached hereto. 
  
 8. Amendment of Schedule 5.10(a).
Schedule 5.10(a) to the SPA is hereby amended to delete in its entirety the language in each of items numbered 1 and 2 of Schedule 5.10(a) and to replace such language with “Intentionally Omitted”. 
  
 9. Amendment of Schedule 5.11(a). Schedule 5.11(a) to the SPA is
hereby amended to (a) add in Item 13 an asterisk immediately following the name “Ellen Tress”, (b) add the following names to Schedule 5.11(a): 
  

	 	“41.	Annette Mendez 

	 	  42.	Koon Wing Sung 

	 	  43.	Dakeshia Parsons-Cruz 

	 	  44.	Maria Quinones 

	 	  45.	Pascal Galmot 

	 	  46.	Yury Dreysler 

	 	  47.	Frank Gomez”, 

  
 (c) delete the name “Marsha Bronson” from Item 24 on Schedule 5.11(a), leaving Item 24 intentionally blank, (d) delete the name “Paul Marek” from Item 31 on Schedule 5.11(a), leaving Item 31
intentionally blank, and (e) delete in its entirety the language after the asterisk at the bottom of Schedule 5.11(a) and to replace such language with the following: 
  
 “Employee would be a full-time Sithe employee, but 20% of Ellen Tress’s time and 50% of Glenn Krapf’s time
would be allocated to Exelon Generation or its Affiliates for Sithe International assistance under a services contract pursuant to which 20%, in the case of Ellen Tress, and 50%, in the case of Glenn Krapf, of the employee’s total compensation
would be charged to Exelon Generation or its Affiliates.” 
  

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 B. Accrued Vacation. Notwithstanding anything to the contrary in the SPA, ExRes, Buyer and Selling
Stockholders hereby agree that: 
  
 1. Sithe and Allegheny
Employees. Within thirty (30) days after the Closing Date, Buyer and ExRes shall cause Sithe to deliver to Exelon a schedule showing the amount of accrued vacation held by each Sithe Employee and Allegheny Employee as of the Closing Date
together with the dollar value of such accrued vacation for each Sithe Employee and Allegheny Employee, calculated based on the accrued vacation policy applicable to such employees immediately prior to the Closing. Exelon shall pay Buyer or its
designee by wire transfer of immediately available funds the aggregate dollar value of such accrued vacation for all such Sithe Employees and Allegheny Employees as shown on such schedule within ten (10) days after Exelon’s receipt of such
schedule. 
  
 2. MRA Employees. Within thirty (30) days
after Exelon’s receipt of the Decommissioning Notice, Buyer and ExRes shall cause Sithe to deliver to Exelon a schedule showing the amount of accrued vacation held by each MRA Employee as of the Closing Date together with the dollar value of
such accrued vacation for each MRA Employee, calculated based on the accrued vacation policy applicable to such employees immediately prior to the Closing. Exelon shall pay Buyer or its designee by wire transfer of immediately available funds the
aggregate dollar value of such accrued vacation for all such MRA Employees as shown on such schedule within ten (10) days after Exelon’s receipt of such schedule. 
  
 3. Termination of Vacation Obligations. Upon Exelon’s payment to Buyer or its designee as provided in Section
B.1. and/or Section B.2. above, neither Exelon nor its Affiliates shall have any further obligations or liabilities to Buyer or its Affiliates with respect to vacation accrued prior to the Closing Date by the Sithe Employees, Allegheny Employees and
MRA Employees with respect to which such payments were made by Exelon. 
  
 4. Refunds. If Buyer or its Affiliates receives any payments from any of the Allegheny Companies or, if Buyer delivers a Decommissioning Notice, the MRA Companies, with respect to vacation accrued by the Allegheny Employees or MRA
Employees, as applicable, and if Exelon has made payments as provided in Section B.1 and Section B.2 above, as applicable, Buyer shall promptly pay to Exelon by wire transfer of funds such amounts received from any of the Allegheny Companies or MRA
Companies, as applicable. 
  

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 C. Amendment to SPA Sections. ExRes, Buyer and Selling Stockholders desire to amend certain
Sections of the SPA as follows: 
  
 1. Section 2.2.
Section 2.2 of the SPA is amended by changing the place and address of the Closing from the offices of Morgan, Lewis & Bockius LLP, 1701 Market Street, Philadelphia, Pennsylvania to the offices of Morgan, Lewis & Bockius LLP, 101 Park
Avenue, New York, New York. 
  
 2. Section 5.16(c). Section
5.16(c) is amended by deleting in their entirety Sections 5.16(c)(i) and (ii) and replacing such Sections with the following new Sections 5.16(c)(i) and (ii): 
  

“(i) If the MRA Value with respect to such MRA Company is positive, Exelon shall, within ten Business Days after receiving such
statement, pay to Buyer, in cash, an amount equal to the MRA Value for such MRA Company. 
  
 (ii) If the MRA Value with respect to such MRA Company is negative, Exelon shall carry the negative MRA Value to each successive month
prior to the completion of Decommissioning activity with respect to such MRA Company, to be netted against any positive MRA Value in such successive month(s).” 
  
 Section 5.16(c) is further amended by deleting the word “negative” in the first sentence following Section 5.16(c)(ii) and
replacing such word with the word “positive”. 
  
 D.
Office Space. ExRes, Buyer and Selling Stockholders hereby agree that for so long as Sithe maintains office space in New York, New York that has not otherwise become subject to a lease or sublease to a third party (but no longer than December
31, 2005), Buyer shall allow Peter Furniss, at no cost to Exelon, to continue to utilize office space (as long as such space is reasonably available) substantially similar to that which Peter Furniss has immediately prior to the Closing. 

 
 Except as amended, modified or waived hereby, the SPA remains in full
force and effect and is hereby ratified and affirmed. This letter agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same amendatory instrument, and any of the parties hereto may execute
this letter agreement by signing any such counterpart. This letter agreement shall be governed by, and construed in accordance with, the internal laws of the State of New York. 
  
 [Signature Page Follows] 
  

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 IN WITNESS WHEREOF, the parties have duly executed this letter agreement as of the date first above
written. 
  

			
	EXELON SHC, INC.
		
	By:	 	 /S/    TODD D.
CUTLER        

	Name:	 	Todd D. Cutler
	Title:	 	Assistant Secretary
	
	EXELON NEW ENGLAND POWER MARKETING, L.P.
		
	By:	 	 /S/    TODD D.
CUTLER        

	Name:	 	Todd D. Cutler
	Title:	 	 Assistant Secretary of Exelon AOG Holding #1, Inc.,
 its general partner

	
	DYNEGY NEW YORK HOLDINGS INC.
		
	By:	 	 /S/    ALEC
DRYER        

	Name:	 	Alec Dryer
	Title:	 	President
	
	EXRES SHC, INC.
		
	By:	 	 /S/    TODD D.
CUTLER        

	Name:	 	Todd D. Cutler
	Title:	 	Assistant Secretary

  

 - 5 -Amendment of Stock Purchase Agreement (Luz Sale)

 Exhibit 10.51 
  
 EXELON SHC, INC. 
 EXELON NEW ENGLAND POWER MARKETING, L.P. 
 c/o Exelon Generation Company, LLC 
 300 Exelon Way 
 Kennett Square, PA 19348 
  
 January 31, 2005 
  
 Dynegy New York Holdings Inc. 
 c/o Dynegy Inc.

 1000 Louisiana Street, Suite 5800 
 Houston, TX 77002

 Attention: Alec G. Dryer 
  
 ExRes SHC, Inc. 
 355 Madison Avenue 
 18th Floor 
 New York, NY 10017 
 Attention: Todd Cutler 
  
 Re: Amendment of Stock Purchase Agreement—Luz Sale 
  
 Gentlemen: 
  
 Reference is made
to that certain Stock Purchase Agreement, dated as of November 1, 2004, as amended by those certain letter agreements dated December 2, 2004, December 31, 2004 and January 31, 2005 (the “SPA”), in each case by and among Exelon SHC, Inc.,
Exelon New England Power Marketing, L.P., Dynegy new York Holdings Inc. and ExRes SHC, Inc. Capitalized terms used herein without definition shall have the definitions given such terms in the SPA. 
  
 Section 2.4 of the SPA provides for certain Purchase Price adjustments. The
Parties to the SPA desire to amend the SPA to provide for another Purchase Price adjustment related to the possible sale of the Sithe’s indirect interest in Luz Solar Partners Ltd., III. Section 2.4 of the SPA is hereby amended to add the
following as new clause (h) of Section 2.4 immediately after clause (g) of Section 2.4: 
  
 “(h) In addition, in the event that Sithe or its Subsidiaries have not received the purchase price payable with respect to the sale
of Sithe’s indirect interest in Luz Solar Partners Ltd., III by 11:59 p.m. on February 1, 2005, the Purchase Price shall be decreased by $1,151,510.26. Notwithstanding the provisions of Section 6.1(e), if Sithe or its Subsidiaries have not
received the purchase price payable with respect to the sale of Sithe’s indirect interest in Luz Solar Partners Ltd., III by 11:59 p.m. on 

 
January 31, 2005, the Parties hereby agree and acknowledge that the aggregate amount of unrestricted cash in ExRes and Sithe as of the Closing Date as
required by Section 6.1(e) shall be reduced by $1,151,510.26.” 
  
 Execept as amended, modified or waived hereby, the SPA remains in full force and effect and is hereby ratified and affirmed. This letter agreement may be executed in any number of counterparts, all of which taken together shall constitute
one and the same amendatory instrument, and any of the parties hereto may execute this letter agreement by signing any such counterpart. This letter agreement shall be governed by, and construed in accordance with, the internal laws of the State of
New York. 
  
 [Signature Page Follows] 
  

 2 

 IN WITNESS WHEREOF, the parties have duly executed this letter agreement as of the date first above
written. 
  

			
	EXELON SHC, INC.
		
	By:	 	/s/ Todd D. Cutler
	Name:	 	Todd D. Cutler
	Title:	 	Assistant Secretary
	
	EXELON NEW ENGLAND POWER MARKETING, L.P.
		
	By:	 	/s/ Todd D. Cutler
	Name:	 	Todd D. Cutler
	Title:	 	 Assistant Secretary of Exelon AOG Holding #1, Inc.,
its General Partner

	
	DYNEGY NEW YORK HOLDINGS INC.
		
	By:	 	/s/ Alec Dryer
	Name:	 	Alec Dryer
	Title:	 	President
	
	EXRES SHC, INC.
		
	By:	 	/s/ Todd D. Cutler
	Name:	 	Todd D. Cutler
	Title:	 	Assistant Secretary

  

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