NORTHEAST UTILITIES SYSTEM
SC 13G/A, 1997-03-10
ELECTRIC SERVICES
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SCHEDULE 13G  
  
Amendment No. 1  
Northeast Utilities System  
Common Stock  
Cusip # 664397106  
 
 
Cusip # 664397106  
Item 1:	Reporting Person - FMR Corp. - (Tax ID:  04-2507163)  
Item 4:	Commonwealth of Massachusetts  
Item 5:	206,350  
Item 6:	None  
Item 7:	2,318,850  
Item 8:	None  
Item 9:	2,318,850  
Item 11:	1.81%  
Item 12:	HC   
  
  
 
 
Cusip # 664397106  
Item 1:	Reporting Person - Edward C. Johnson 3d   
Item 4:	United States of America  
Item 5:	None  
Item 6:	None  
Item 7:	2,318,850  
Item 8:	None  
Item 9:	2,318,850  
Item 11:	1.81%  
Item 12:	IN   
  
 
 
Cusip # 664397106  
Item 1:	Reporting Person - Abigail P. Johnson   
Item 4:	United States of America  
Item 5:	None  
Item 6:	None  
Item 7:	2,318,850  
Item 8:	None  
Item 9:	2,318,850  
Item 11:	1.81%  
Item 12:	IN   
  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
  
PREAMBLE  
  
	Based upon the information presently available to the undersigned, as  
of the date hereof and as of December 31, 1996 (the date as of which the  
undersigned reported its ownership in its original report on Schedule 13G  
filed with the Securities and Exchange Commission on February 14, 1997 (the  
"Original 13G")), the undersigned was the beneficial owner of approximately  
1.81% of the number of shares of the common stock of the issuer (the "Common  
Stock") outstanding.  Accordingly, notwithstanding the filing of the Original  
13G, the undersigned is not, and was not on December 31, 1996, a Reporting  
Person required to file reports on Schedule 13G.  The undersigned will not in  
the future file reports on Schedule 13G relating to the Common Stock unless  
and until the undersigned otherwise becomes a Reporting Person.  
  
Item 1(a).	Name of Issuer:  
  
		Northeast Utilities System  
  
Item 1(b).	Name of Issuer's Principal Executive Offices:  
  
		174 Brush Hill Avenue   
		West Springfield, MA  01090  
  
Item 2(a).	Name of Person Filing:   
  
		FMR Corp.  
  
Item 2(b).	Address or Principal Business Office or, if None, Residence:  
  
		82 Devonshire Street, Boston, Massachusetts  02109  
  
Item 2(c).	Citizenship:  
  
		Not applicable  
  
Item 2(d).	Title of Class of Securities:  
  
		Common Stock  
  
Item 2(e).	CUSIP Number:    
  
		664397106  
  
Item 3.	This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) and the  
person filing, FMR Corp., is a parent holding company in accordance  
with Section 240.13d-1(b)(ii)(G).  (Note:  See Item 7).  
  
Item 4.	Ownership  
  
		The Funds and Accounts do not, and did not as of December 31,  
1996, own more than 5% 			of the Common Stock.  Accordingly, the  
information required by this Item 4 is not required to 		be  
disclosed.  Any information provided in the Original 13G under this item is  
hereby 			withdrawn 
 
 
Item 5.	Ownership of Five Percent or Less of a Class.  
  
		The Funds and Accounts do not, and did not as of December 31,  
1996, own more than 5% of the Common Stock.  Accordingly, the  
information required by this Item 5 is not required to be  
disclosed.  Any information provided in the Original 13G under  
this item is hereby withdrawn.  
  
Item 6.	Ownership of More than Five Percent on Behalf of Another Person.  
  
		Not applicable.  
  
Item 7.	Identification and Classification of the Subsidiary Which Acquired  
the Security Being Reported on By the Parent Holding Company.  
  
	See attached Exhibit(s) A and B.  
  
Item 8.	Identification and Classification of Members of the Group.  
  
	Not applicable, see attached Exhibit A.   
  
Item 9.	Notice of Dissolution of Group.  
  
	Not applicable.  
  
Item 10.	Certification.  
  
	Inasmuch as the reporting persons are not the beneficial owners  
of more than 5% of the Common Stock outstanding, the reporting  
persons have no reporting obligation under Section 13(d) of the  
Securities and Exchange Commission thereunder, and the  
reporting persons have no obligation to amend this Statement if  
any material change occurs in the facts set forth herein.  
  
  
Signature  
  
	After reasonable inquiry and to the best of my knowledge and  
belief, I certify that the information set forth in this  
Schedule 13G in connection with FMR Corp.'s beneficial  
ownership of the common stock of Northeast Utilities System at  
December 31, 1996 is true, complete and correct.   
  
  
	March 7, 1997	  
Date  
  
  
  
	/s/Arthur S. Loring  
Signature  
  
  
  
	Arthur S. Loring, Vice  
President	  
Name/Title  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
  
	Pursuant to the instructions in Item 7 of Schedule 13G, Fidelity  
Management & Research Company ("Fidelity"), 82 Devonshire Street, Boston,  
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and an investment  
adviser registered under Section 203 of the Investment Advisers Act of 1940,  
is the beneficial owner of 1,986,700 shares or 1.55% of the common stock  
outstanding of Northeast Utilities System ("the Company") as a result of  
acting as investment adviser to various investment companies registered under  
Section 8 of the Investment Company Act of 1940.    
  
	Edward C. Johnson 3d, FMR Corp., through its control of Fidelity, and the  
funds each has sole power to dispose of the 1,986,700 shares owned by the  
Funds.  
  
	Neither FMR Corp. nor Edward C. Johnson 3d, Chairman of FMR Corp., has  
the sole power to vote or direct the voting of the shares owned directly by  
the Fidelity Funds, which power resides with the Funds' Boards of Trustees.   
Fidelity carries out the voting of the shares under written guidelines  
established by the Funds' Boards of Trustees.  
  
	Fidelity Management Trust Company, 82 Devonshire Street, Boston,  
Massachusetts 02109, a wholly-owned subsidiary of FMR Corp. and a bank as  
defined in Section 3(a)(6) of the Securities Exchange Act of 1934, is the  
beneficial owner of 332,150 shares or 0.26% of the common stock outstanding of  
the Company as a result of its serving as investment manager of the  
institutional account(s).    
  
	Edward C. Johnson 3d and FMR Corp., through its control of Fidelity  
Management Trust Company, has sole dispositive power over 332,150 shares and  
sole power to vote or to direct the voting of 206,350 shares, and no power to  
vote or to direct the voting of 125,800 Shares of common stock owned by the  
institutional account(s) as reported above.  
  
	Members of the Edward C. Johnson 3d family and trusts for their benefit  
are the predominant owners of  Class B shares of common stock of FMR Corp.,  
representing approximately 49% of the voting power of FMR Corp. Mr. Johnson 3d  
owns 12.0% and Abigail P. Johnson owns 24.5% of the aggregate outstanding  
voting stock of FMR Corp.  Mr. Johnson 3d is Chairman of FMR Corp. and Abigail  
P. Johnson is a Director of FMR Corp.  The Johnson family group and all other  
Class B  shareholders have entered into a shareholder's voting agreement under  
which all Class B shares will be voted in accordance with the majority vote of  
Class B shares.  Accordingly, through their ownership of voting common stock  
and the execution of the shareholder's voting agreement, members of the  
Johnson family may be deemed, under the Investment Company Act of 1940, to  
form a controlling group with respect to FMR Corp.  
  
 
 
SCHEDULE 13G - TO BE INCLUDED IN STATEMENTS  
FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b)  
RULE 13d-1(f)(1)  AGREEMENT  
  
	The undersigned persons, on March 7, 1997, agree and consent to the joint  
filing on their behalf of this Schedule 13G in connection with their  
beneficial ownership of the common stock of Northeast Utilities System at  
December 31, 1996.  
	FMR Corp.  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Vice President - Legal  
	Edward C. Johnson 3d  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Under Power of Attorney dated  
5/17/89 
On File with Schedule 13G for 
Airborne Freight Corp. 9/10/91   
  
	Abigail P. Johnson  
  
  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Under Power of Attorney dated  
1/5/96 
On File with Schedule 13G for 
Acclaim Entertainment Inc.  
1/10/96  
	Fidelity Management & Research Company  
	By	/s/Arthur S. Loring  
Arthur S. Loring 
Sr. V.P. and General Counsel  
 


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