FORM 4
[ X ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES
                                                                                  
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public
Utility Holding Company Act of 1935 or Section 30(f) of the Investment Company Act of 1940
                      

1. Name and Address of Reporting Person *

SCHWEIGER WERNER J 		2. Issuer Name and Ticker or Trading Symbol

NSTAR/MA [ NST ] 		5. Relationship of Reporting Person(s) to Issuer (Check all applicable)

_____ Director                      _____ 10% Owner
__ X __ Officer (give title below)      _____ Other (specify below)
SVP-Operations
(Last)          (First)          (Middle)

800 BOYLSTON STREET 		3. Date of Earliest Transaction (MM/DD/YYYY)

4/10/2012
(Street)

BOSTON, MA 02199
(City)        (State)        (Zip)
4. If Amendment, Date Original Filed (MM/DD/YYYY)

 
6. Individual or Joint/Group Filing (Check Applicable Line)

_ X _ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3) 		2. Trans. Date 2A. Deemed Execution Date, if any 3. Trans. Code
(Instr. 8) 		4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4) 		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Shares   4/10/2012     A    7550   A $0   198237   (1) D    
Common Shares   4/10/2012     A    16100   (2) A $0   214337   (1) D    
Common Shares   4/10/2012     F    202   D $47.65   214135   (1) D    
Common Shares   4/10/2012     D    146160   D   (3) 67975   D    
Common Shares   4/10/2012     D    16100   D   (4) 51875   D    
Common Shares   4/10/2012     D    51875   D   (5) 0   D    
Common Shares   4/10/2012     D    5400   D   (6) 0   I   By 401(k)  

Table II - Derivative Securities Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security
(Instr. 3) 		2. Conversion or Exercise Price of Derivative Security 3. Trans. Date 3A. Deemed Execution Date, if any 4. Trans. Code
(Instr. 8) 		5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5) 		6. Date Exercisable and Expiration Date 7. Title and Amount of Securities Underlying Derivative Security
(Instr. 3 and 4) 		8. Price of Derivative Security
(Instr. 5) 		9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option   $21.60   4/10/2012     D         35000    4/30/2006   4/30/2013   Common Shares   35000     (7) 0   D    
Employee Stock Option   $24.20   4/10/2012     D         70000    4/28/2007   4/28/2014   Common Shares   70000     (8) 0   D    
Employee Stock Option   $29.60   4/10/2012     D         60000    6/9/2008   6/9/2015   Common Shares   60000     (9) 0   D    
Employee Stock Option   $27.73   4/10/2012     D         48000    4/27/2009   4/27/2016   Common Shares   48000     (10) 0   D    
Employee Stock Option   $36.89   4/10/2012     D         36000    5/3/2010   5/3/2017   Common Shares   36000     (11) 0   D    
Employee Stock Option   $32.45   4/10/2012     D         30000    1/24/2011   1/24/2018   Common Shares   30000     (12) 0   D    
Employee Stock Option   $34.02   4/10/2012     D         37000    1/22/2012   1/22/2019   Common Shares   37000     (13) 0   D    
Employee Stock Option   $35.28   4/10/2012     D         28000    1/28/2013   1/28/2020   Common Shares   28000     (14) 0   D    

Explanation of Responses:
( 1)  Includes 146,362 Phantom Shares (deferred compensation obligations). Each Phantom Share is payable in one Common Share.
( 2)  Represents deferred share units of 8,300 shares that vest in three equal annual installments beginning on 01/27/2012 and 7,800 shares that vest in three equal annual installments beginning on 1/26/2013.
( 3)  Disposition of Phantom Shares pursuant to the merger agreement between issuer and Northeast Utilities ("NU") in exchange for 191,761 NU phantom shares having a market value of $36.79 per share at the effective time of the merger.
( 4)  Disposed of pursuant to the Merger in exchange for a total of 21,123 NU restricted shares subject to time vesting conditions.
( 5)  Disposed of pursuant to the Merger in exchange for a total of 68,060 NU common shares.
( 6)  Disposed of pursuant to the Merger in exchange for 7,084 NU common shares.
( 7)  This option was assumed by NU in the merger and replaced with an option to purchase 45,920 NU Common Shares at a price of $16.47 per share.
( 8)  This option was assumed by NU in the merger and replaced with an option to purchase 91,840 NU Common Shares at a price of $18.45 per share.
( 9)  This option was assumed by NU in the merger and replaced with an option to purchase 78,720 NU Common Shares at a price of $22.57 per share.
( 10)  This option was assumed by NU in the merger and replaced with an option to purchase 62,976 NU Common Shares at a price of $21.14 per share.
( 11)  This option was assumed by NU in the merger and replaced with an option to purchase 47,232 NU Common Shares at a price of $28.12 per share.
( 12)  This option was assumed by NU in the merger and replaced with an option to purchase 39,360 NU Common Shares at a price of $24.74 per share.
( 13)  This option was assumed by NU in the merger and replaced with an option to purchase 48,544 NU Common Shares at a price of $25.93 per share.
( 14)  This option was assumed by NU in the merger and replaced with an option to purchase 36,736 NU Common Shares at a price of $26.90 per share.

Reporting Owners
Reporting Owner Name / Address
Relationships
Director 10% Owner Officer Other
SCHWEIGER WERNER J
800 BOYLSTON STREET
BOSTON, MA 02199

SVP-Operations

Signatures
/s/ Richard J. Morrison - Attorney in Fact for Werner J. Schweiger 4/10/2012
** Signature of Reporting Person Date


Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
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