<PAGE 1>


               UNITED STATES SECURITIES AND EXCHANGE COMMISSION

                          Washington, D.C. 20549-1004


                                   FORM 10-Q


(Mark One)

[ X ] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

      For the quarterly period ended September 30, 1997

                                      OR

[   ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES
      EXCHANGE ACT OF 1934

      For the Transition Period from ________________ to ________________

                         Commission File Number 1-7316

                            COMMONWEALTH ENERGY SYSTEM                   
      (Exact name of registrant as specified in its Declaration of Trust)

              Massachusetts                                  04-1662010  
      (State or other jurisdiction of                    (I.R.S. Employer
      incorporation or organization)                     Identification No.)


      One Main Street, Cambridge, Massachusetts              02142-9150    
      (Address of principal executive offices)               (Zip Code)


      Registrant's telephone number, including area code   (617) 225-4000  

                                                                         
      (Former name, address and fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to
such filing requirements for the past 90 days.       YES   X    NO       

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

                                                   Outstanding at
         Class of Common Stock                     November 1, 1997

      Common Shares of Beneficial
      Interest, $2 par value                       21,531,784 shares

<PAGE 2>


                        PART I. - FINANCIAL INFORMATION

Item 1.  Financial Statements

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

                           CONDENSED BALANCE SHEETS

                   SEPTEMBER 30, 1997 AND DECEMBER 31, 1996

                                    ASSETS

                            (Dollars in thousands)


                                                   September 30, December 31, 
                                                       1997          1996     
                                                    (Unaudited)

PROPERTY, PLANT AND EQUIPMENT, at original cost
  Electric                                          $1,163,660   $1,150,818
  Gas                                                  367,505      357,403
  Other                                                 73,309       66,365
                                                     1,604,474    1,574,586
  Less - Accumulated depreciation and
           amortization                                570,711      536,041
                                                     1,033,763    1,038,545
  Add - Construction work in progress
          and nuclear fuel in process                   12,084        7,082
                                                     1,045,847    1,045,627

EQUITY IN CORPORATE JOINT VENTURES
  Nuclear electric power companies (2.5%
     to 4.5%)                                           10,751       10,046
  Other investments                                      3,715        3,349
                                                        14,466       13,395

CURRENT ASSETS
  Cash                                                   5,069        1,495
  Accounts receivable                                   86,210      117,008
  Unbilled revenues                                     19,726       31,698
  Inventories, at average cost                          34,427       31,525
  Prepaid taxes and other                               20,325       14,765
                                                       165,757      196,491

DEFERRED CHARGES
  Regulatory assets                                    184,681      154,291
  Other                                                 26,210       19,151
                                                       210,891      173,442

                                                    $1,436,961   $1,428,955



                            See accompanying notes.

<PAGE 3>


              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

                           CONDENSED BALANCE SHEETS

                   SEPTEMBER 30, 1997 AND DECEMBER 31, 1996

                        CAPITALIZATION AND LIABILITIES

                            (Dollars in thousands)

                                                  September 30, December 31,
                                                      1997          1996    
                                                   (Unaudited)
CAPITALIZATION
  Common share investment -
    Common shares, $2 par value -
      Authorized - 50,000,000 shares
      Outstanding - 21,531,784 in 1997 and
        21,526,676 in 1996                          $   43,064   $   43,059
    Amounts paid in excess of par value                111,838      111,685
    Retained earnings                                  266,861      260,950
                                                       421,763      415,694
  Redeemable preferred shares, less current
    sinking fund requirements                           12,200       13,020
  Long-term debt, including premiums, less current
    sinking fund requirements and maturing debt        379,458      355,305
                                                       813,421      784,019

CAPITAL LEASE OBLIGATIONS                               12,037       12,346

CURRENT LIABILITIES
  Interim Financing - 
    Notes payable to banks                              61,050      118,475
    Maturing long-term debt                             10,000       14,260
                                                        71,050      132,735

  Other Current Liabilities -
    Current sinking fund requirements                    8,473        8,473
    Accounts payable                                    80,296       90,269
    Accrued taxes                                       18,922       16,970
    Other                                               68,267       53,835
                                                       175,958      169,547
                                                       247,008      302,282

DEFERRED CREDITS
  Accumulated deferred income taxes                    183,197      174,877
  Unamortized investment tax credits
     and other                                         181,298      155,431
                                                       364,495      330,308

COMMITMENTS AND CONTINGENCIES

                                                    $1,436,961   $1,428,955

                            See accompanying notes.

<PAGE 4>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

                        CONDENSED STATEMENTS OF INCOME

        FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996

                 (Dollars in thousands, except per share amounts)
                                  (Unaudited)

                                   Three Months Ended     Nine Months Ended 
                                    1997        1996       1997        1996
OPERATING REVENUES
  Electric                         $177,723   $175,689    $511,778   $494,117
  Gas                                41,870     48,761     235,067    240,517
  Steam and other                     2,522      2,459      13,404     13,556
                                    222,115    226,909     760,249    748,190

OPERATING EXPENSES
  Fuel and purchased power           97,275     94,245     289,320    271,014
  Cost of gas sold                   25,390     30,334     128,127    130,140
  Other operation and maintenance    59,809     63,269     199,996    189,437
  Depreciation                       12,078     11,340      40,398     37,851
  Taxes -
    Federal and state income          6,163      4,788      19,907     27,676
    Local property and other          4,513      5,332      21,929     19,719
                                    205,228    209,308     699,677    675,837

OPERATING INCOME                     16,887     17,601      60,572     72,353

OTHER INCOME                            340      1,237       1,970      4,970

INCOME BEFORE INTEREST CHARGES       17,227     18,838      62,542     77,323

INTEREST CHARGES
  Long-term debt                      8,123      8,809      24,912     27,039
  Other interest charges              2,077      1,724       5,695      4,790
  Allowance for borrowed funds
    used during construction           (120)       (55)       (278)      (236)
                                     10,080     10,478      30,329     31,593
NET INCOME                            7,147      8,360      32,213     45,730
  Dividends on preferred shares         248        263         751        797
EARNINGS APPLICABLE TO
  COMMON SHARES                    $  6,899   $  8,097    $ 31,462   $ 44,933
AVERAGE NUMBER OF COMMON
  SHARES OUTSTANDING             21,531,784 21,529,676  21,530,378 21,529,676

EARNINGS PER COMMON SHARE             $ .32      $ .37       $1.46      $2.08
DIVIDENDS DECLARED PER
  COMMON SHARE                        $.395      $.385      $1.185     $1.155


                            See accompanying notes.

<PAGE 5>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

                      CONDENSED STATEMENTS OF CASH FLOWS

             FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1997 AND 1996

                           (Dollars in thousands)
                                  (Unaudited)

                                                         1997         1996   

OPERATING ACTIVITIES
  Net income                                           $ 32,213     $ 45,730
  Effects of noncash items -
    Depreciation and amortization                        50,000       46,748
    Deferred income taxes and investment
      tax credits, net                                   (2,174)      (1,618)
    Earnings from corporate joint ventures               (1,229)      (1,333)
  Dividends from corporate joint ventures                   545          949
  Change in working capital, exclusive of cash
    and interim financing                                40,719      (18,813)
  All other operating items                             (13,474)      (6,956)
Net cash provided by operating activities               106,600       64,707

INVESTING ACTIVITIES
  Additions to property, plant and equipment
    (exclusive of AFUDC) -
      Electric                                          (22,842)     (27,707)
      Gas                                               (11,567)      (6,316)
      Other                                              (2,461)        (992)
  Equity investment in corporate joint venture             (575)         -  
  Allowance for borrowed funds used during
    construction                                           (278)        (236)
Net cash used for investing activities                  (37,723)     (35,251)

FINANCING ACTIVITIES
  Sale of common shares                                     -             32
  Payment of dividends                                  (26,302)     (25,664)
  Proceeds from (payment of) short-term borrowings      (57,425)      23,225
  Long-term debt issues                                  35,000          -  
  Long-term debt issues refunded                        (14,260)     (23,230)
  Sinking funds payments                                 (2,316)      (2,295)
Net cash used for financing activities                  (65,303)     (27,932)
Net increase in cash                                      3,574        1,524
Cash at beginning of period                               1,495        4,319
Cash at end of period                                  $  5,069     $  5,843

SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
  Cash paid during the period for:
    Interest (net of capitalized amounts)              $ 29,082     $ 30,885
    Income taxes                                       $ 17,154     $ 10,110




                            See accompanying notes.

<PAGE 6>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

                    NOTES TO CONDENSED FINANCIAL STATEMENTS

(1) General Information

        Commonwealth Energy System, the parent company, is referred to in this
    report as the "System" and, together with its subsidiaries, is collec-
    tively referred to as "the system."  The System is an exempt public
    utility holding company under the provisions of the Public Utility Holding
    Company Act of 1935 with investments in four operating public utility
    companies located in central, eastern and southeastern Massachusetts.  In
    addition, the System has interests in other utility and several
    nonregulated companies.

        The system has 1,769 regular employees including 1,070 (61%)
    represented by various collective bargaining units.  A contract with a
    collective bargaining unit representing approximately 5% of regular
    employees that was scheduled to expire in May 1997 was ratified in April
    1997 and is effective through May 31, 2001.

        During the second quarter of 1997, the system initiated a voluntary
    personnel reduction program.  For additional information, see the
    "Personnel Reduction Program" section under Management's Discussion and
    Analysis of Financial Condition and Results of Operations.

(2) Significant Accounting Policies

    (a) Principles of Accounting

        The system's significant accounting policies are described in Note 1
    of Notes to Consolidated Financial Statements included in its 1996 Annual
    Report on Form 10-K filed with the Securities and Exchange Commission. 
    For interim reporting purposes, the system follows these same basic
    accounting policies but considers each interim period as an integral part
    of an annual period and makes allocations of certain expenses to interim
    periods based upon estimates of such expenses for the year.

        Generally, expenses which relate to more than one interim period are
    allocated to other periods to more appropriately match revenues and
    expenses.  Principal items of expense which are allocated other than on
    the basis of passage of time are depreciation and property taxes of the
    gas subsidiary, Commonwealth Gas Company (Commonwealth Gas).  These
    expenses are recorded for interim reporting purposes based upon projected
    gas revenue.  Income tax expense is recorded using the statutory rates in
    effect applied to book income subject to tax for each interim period.

        The unaudited financial statements for the periods ended September 30,
    1997 and 1996, reflect, in the opinion of the System, all adjustments
    (consisting of only normal recurring accruals, except for those described
    in the "Personnel Reduction Program" section under Management's Discussion
    and Analysis of Financial Condition and Results of Operations) necessary
    to summarize fairly the results for such periods.  In addition, certain
    prior period amounts are reclassified from time to time to conform with
    the presentation used in the current period's financial statements.

<PAGE 7>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

        The results for interim periods are not necessarily indicative of
    results for the entire year because of seasonal variations in the
    consumption of energy, Commonwealth Gas' seasonal rate structure and the
    accrual of the costs associated with the aforementioned personnel
    reduction program.

    (b) Regulatory Assets and Liabilities

        The system's operating utility companies are regulated as to rates,
    accounting and other matters by various authorities, including the Federal
    Energy Regulatory Commission (FERC) and the Massachusetts Department of
    Public Utilities (DPU).

        Based on the current regulatory framework, the system accounts for the
    economic effects of regulation in accordance with the provisions of
    Statement of Financial Accounting Standards (SFAS) No. 71, "Accounting for
    the Effects of Certain Types of Regulation."  Regulated subsidiaries of
    the System have established various regulatory assets in cases where the
    DPU and/or the FERC have permitted or are expected to permit recovery of
    specific costs over time.  Similarly, regulatory liabilities established
    by the system are required to be refunded to customers over time. 
    Effective January 1, 1996, the system adopted SFAS No. 121, "Accounting
    for the Impairment of Long-Lived Assets and for Long-Lived Assets to be
    Disposed Of."  SFAS No. 121 imposes stricter criteria for regulatory
    assets by requiring that such assets be probable of future recovery at
    each balance sheet date.  SFAS No. 121 did not have an impact on the
    system's financial position upon adoption.  This result may change as
    modifications are made to the current regulatory framework due to ongoing
    electric industry restructuring efforts in Massachusetts.  If all or a
    separable portion of the system's operations becomes no longer subject to
    the provisions of SFAS No. 71, a write-off of related regulatory assets
    and liabilities would be required, unless some form of transition cost
    recovery continues through rates established and collected under cost-
    based ratemaking for the system's remaining regulated operations.  In
    addition, the system would be required to determine any impairment to the
    carrying costs of deregulated plant and inventory assets.  However,
    pending Massachusetts legislation provides for recovery of stranded costs,
    subject to review.  For additional information relating to industry
    restructuring, see the "Electric Industry Restructuring" section under
    Management's Discussion and Analysis of Financial Condition and Results of
    Operations.

<PAGE 8>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

        The principal regulatory assets included in deferred charges were as
    follows:

                                                    September 30, December 31,
                                                        1997          1996   
                                                      (Dollars in thousands)

        Maine Yankee unrecovered plant and
           decommissioning costs                       $ 37,596    $    -  
        Connecticut Yankee unrecovered plant and
           decommissioning costs                         30,021      35,879
        Fuel charge stabilization                        30,270      21,504
        Postretirement benefits costs including
           pensions                                      24,919      25,051
        Power contract buy-out                           18,432      20,794
        Deferred income taxes                            13,720      13,597
        FERC Order 636 transition costs                   7,685       9,680
        Yankee Atomic unrecovered plant and
           decommissioning costs                          6,080       7,798
        Seabrook related costs                            4,655       6,262
        Other                                            11,303      13,726
                                                       $184,681    $154,291

        On April 15, 1997, the DPU issued an accounting ruling allowing
    Commonwealth Gas to include postretirement benefits costs in cost-of-
    service and to amortize the deferred balance of $10.5 million at March 31,
    1997 associated with these costs over a period not to exceed ten years
    beginning in April 1997.

        The regulatory liabilities, reflected in the accompanying Condensed
    Balance Sheets and related to deferred income taxes, were $15.3 million
    and $17.7 million at September 30, 1997 and December 31, 1996,
    respectively.

(3) Commitments and Contingencies

        (a) Construction Program

        The system is engaged in a continuous construction program presently
    estimated at $298 million for the five-year period 1997 through 2001.  Of
    that amount, $68.2 million is estimated for 1997.  The program is subject
    to periodic review and revision.

        (b) Maine Yankee Nuclear Power Plant

        Cambridge Electric Light Company (Cambridge Electric) has a 4% equity
    ownership interest (approximately $3 million at September 30, 1997), with
    a power entitlement of 31.2 MW, in a nuclear power plant located in
    Wiscasset, Maine.  The plant, operated by Maine Yankee Atomic Power
    Company (Maine Yankee), has been out of service since an outage that began
    in December of 1996.  On August 6, 1997, the Board of Directors of Maine
    Yankee voted to permanently cease power operations and begin the process
    of decommissioning the plant.  The decision to shut down the plant was
    based on an economic analysis of the costs, risks and uncertainties

<PAGE 9>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

    associated with operating the plant compared to those associated with
    closing and decommissioning the plant.  Based upon regulatory precedent,
    Maine Yankee believes that it will be permitted to continue to collect
    from its power purchasers (including Cambridge Electric) decommissioning
    costs, unrecovered plant investment and other costs associated with the
    permanent closure of the plant over the remaining period of the plant's
    operating license that expires in 2008.  Cambridge Electric does not
    believe the ultimate outcome of the early closing of this plant will have
    a material adverse effect on its operations and believes that recovery of
    these FERC-approved costs would continue to be allowed in its rates at the
    retail level.  Therefore, Cambridge Electric recorded a liability for its
    estimated share of decommissioning costs and a corresponding regulatory
    asset in the third quarter.

<PAGE 10>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

Item 2. Management's Discussion and Analysis of Financial Condition
        and Results of Operations

        Financial Condition

        Capital resources of the System and its subsidiaries are derived
    principally from retained earnings.  Supplemental interim funds are
    borrowed on a short-term basis and, when necessary, replaced with new
    equity and/or debt issues through permanent financing secured on an
    individual company basis.  The System purchases 100% of all subsidiary
    common stock issues and provides, to the extent possible, a portion of the
    subsidiaries' short-term financing needs.  These capital resources provide
    the funds required for the subsidiary companies' construction programs,
    current operations, debt service and other capital requirements.

        For the first nine months of 1997, cash flows from operating activi-
    ties amounted to $106.6 million and reflect net income of $32.2 million
    and noncash items including depreciation of $40.4 million and amortization
    of $9.6 million.  Since December 31, 1996, cash flows relating to the
    change in working capital, exclusive of cash and interim financing,
    increased $40.7 million reflecting lower levels of accounts receivable
    ($30.8 million) and unbilled revenues ($12 million), and increases in
    prepaid taxes ($5.9 million), inventory levels ($2.9 million), accrued
    property taxes ($8.3 million) and other current liabilities ($14.4
    million) that includes an accrual relating to a voluntary personnel
    reduction program ($8.3 million).  Offsetting these increases were lower
    levels of accounts payable ($10 million) and accrued income taxes ($6.3
    million).

        Through September 30, 1997 construction expenditures were approxi-
    mately $37.1 million, including an allowance for funds used during
    construction (AFUDC) and nuclear fuel.  Construction expenditures,
    preferred and common dividend requirements of the System ($26.3 million)
    and the retirement of long-term debt including sinking funds ($16.6
    million) were funded entirely with internally-generated funds. 
    Internally-generated funds and proceeds from an external financing
    (discussed below) were used to reduce short-term borrowings ($57.4
    million).

        On September 26, 1997, Commonwealth Gas issued $10 million of First
    Mortgage Sinking Fund Bonds (Series L, 6.54% due 2007) and $25 million of
    First Mortgage Bonds (Series M, 7.04% due 2017).  The proceeds of $35
    million were used to retire short-term debt that had been incurred to
    temporarily finance additions to property, plant and equipment and for
    general working capital needs.  This financing had been approved by the
    DPU on June 12, 1997.

        Results of Operations

        The following is a discussion of major factors that have affected
    operating revenues, expenses and net income during the periods included in
    the accompanying condensed statements of income.  This discussion should
    be read in conjunction with the Notes to Condensed Financial Statements
    appearing elsewhere in this report.

<PAGE 11>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

        A summary of the period to period changes in the principal items
    included in the accompanying condensed statements of income for the three
    and nine-month periods ended September 30, 1997 and 1996 and unit sales
    for these periods is shown below:

                                        Three Months           Nine Months
                                     Ended September 30,   Ended September 30,
                                        1997 and 1996         1997 and 1996  
                                                 Increase (Decrease)
                                               (Dollars in thousands)
  Operating Revenues -
      Electric                           $ 2,034      1.2%    $17,661     3.6%
      Gas                                 (6,891)   (14.1)     (5,450)   (2.3)
      Steam and other                         63      2.6        (152)   (1.1)
                                          (4,794)    (2.1)     12,059     1.6

  Operating Expenses -
      Fuel and purchased power             3,030      3.2      18,306     6.8
      Cost of gas sold                    (4,944)   (16.3)     (2,013)   (1.5)
      Other operation and maintenance     (3,460)    (5.5)     10,559     5.6
      Depreciation                           738      6.5       2,547     6.7
      Taxes -
         Federal and state income           (275)    (5.7)     (7,769)  (28.1)
         Local property and other            831     15.6       2,210    11.2
                                          (4,080)    (1.9)     23,840     3.5

  Operating Income                          (714)    (4.1)    (11,781)  (16.3)

  Other Income                              (897)   (72.5)     (3,000)  (60.4)

  Income Before Interest Charges          (1,611)    (8.6)    (14,781)  (19.1)

  Interest Charges                          (398)    (3.8)     (1,264)   (4.0)

  Net Income                              (1,213)   (14.5)    (13,517)  (29.6)

  Dividends on preferred shares              (15)    (5.7)        (46)   (5.8)

  Earnings Applicable to Common Shares  $ (1,198)   (14.8)   $(13,471)  (30.0)

  Unit Sales
    Electric - Megawatthours (MWH)
      Retail                              62,564      5.0      71,499     2.0
      Wholesale                          215,182     26.6     750,229    35.0
                                         277,746     13.5     821,728    14.5

    Gas - Billions of British Thermal
          Units (BBTU)
      Firm                                  (688)   (18.5)     (1,723)   (6.0)
      Interruptible and other               (508)   (33.2)       (402)  (10.4)
                                          (1,196)   (22.8)     (2,125)   (6.5)



<PAGE 12>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

      The following is a summary of electric and gas unit sales for the three
  and nine-month periods ended September 30, 1997 and 1996:

                                   Three Months Ended     Nine Months Ended
                                      September 30,          September 30,   
                                     1997      1996         1997      1996 
  Electric Sales - MWH
      Residential                   482,030    462,966   1,376,795  1,366,705
      Commercial                    700,817    663,155   1,891,519  1,843,041
      Industrial                    117,416    111,410     327,433    314,686
      Other                           5,398      5,566      17,319     17,135
         Total retail sales       1,305,661  1,243,097   3,613,066  3,541,567
      Wholesale                   1,024,012    808,830   2,894,509  2,144,280
         Total sales              2,329,673  2,051,927   6,507,575  5,685,847

  Gas Sales - BBTU
      Residential                     1,466      1,713      15,123     15,856
      Commercial                      1,012      1,108       7,776      8,180
      Industrial                        393        717       2,663      3,248
      Other                             156        177       1,526      1,527
         Total firm sales             3,027      3,715      27,088     28,811
      Off-system                        475        723       2,007      1,676
      Quasi-firm                         20        307          46        792
      Interruptible                     525        498       1,404      1,391
         Total sales                  4,047      5,243      30,545     32,670

  Electric Operating Revenues, Fuel and Purchased Power Costs

      During the third quarter and first nine months of 1997, electric
  operating revenues increased $2 million (1.2%) and $17.7 million (3.6%),
  respectively, due to a greater level of wholesale sales reflecting the
  changing capacity needs of non-affiliated utilities and the New England
  Power Pool, higher retail unit sales and higher fuel and purchased power
  costs ($3 million and $18.3 million, respectively).  Offsetting these
  factors was the absence of a $4 million refund associated with a 1996 power
  contract settlement agreement.

      The increase in fuel and purchased power costs during the current
  quarter and first nine months of 1997 was due primarily to higher wholesale
  unit sales reflecting the increased availability of Canal Electric
  Company's Units 1 and 2 and higher costs for replacement power reflecting
  the permanent shutdown of Connecticut Yankee during 1996 and the absence of
  power from Maine Yankee which has been out of service since December 1996.

      Retail electric unit sales continued to improve during the current
  quarter, reflecting increases to all customer segments including
  residential (4.1%), commercial (5.7%) and industrial (5.4%).

  Gas Operating Revenues and Cost of Gas Sold

      Gas operating revenues for the third quarter of 1997 decreased
  approximately $6.9 million or 14.1% due primarily to a 22.8% decline in
  total unit sales.  Through the first nine months of this year, operating
  revenues decreased $5.4 million due to a 6.5% decline in total unit sales

<PAGE 13>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

  and lower conservation and load management (C&LM) costs ($2 million). 
  Revenues for the current nine-month period also include the recognition of
  margins earned on off-system contracts ($644,000).

      The decline in firm unit sales for the first nine months of 1997
  reflects decreases to all customer segments including residential (4.6%),
  commercial (4.9%) and industrial (18%) reflecting milder weather
  experienced in this region during the first quarter as compared to a colder
  period in 1996.  Degree days for the current nine-month period totaled
  4,147, 7% lower than last year and 3.5% below the normal level of 4,299. 
  The significant fluctuations in non-firm sales for both the current quarter
  and year-to-date period reflect the competitive environment that currently
  exists in the natural gas industry.  A portion of the margin realized on
  these sales reduces the cost of gas sold to firm customers.

  Other Operating Expenses

      For the third quarter of 1997, other operation and maintenance decreased
  $3.5 million or 5.5% due to the absence of costs relating to a labor
  dispute ($2.5 million) and storm damage from Hurricane Eduoard ($1.9
  million) both of which occurred in 1996.  Also contributing to the decline
  for the quarter were lower payroll costs reflecting the decrease in the
  number of employees, offset, in part, by higher insurance costs             
  ($1 million), higher maintenance costs relating to the Kendall Station
  generator ($523,000) and gas distribution lines ($403,000) and higher C&LM
  costs ($389,000).

      Other operation and maintenance for the first nine months of 1997
  increased $10.6 million or 5.6% due to a one-time charge related to a
  Personnel Reduction Program ($17.7 million) (as further discussed below)
  and storm damage costs associated with an April 1 blizzard ($1.9 million). 
  The impact of these factors was offset, in part, by the absence of costs
  related to the 1996 labor dispute ($3.3 million) and storm damage ($1.9
  million) from Hurricane Eduoard as well as payroll savings related to the
  decrease in the number of employees.

      Depreciation expense increased $738,000 (6.5%) and $2.5 million (6.7%)
  during the current three and nine-month periods due primarily to a higher
  level of depreciable plant reflecting the costs associated with the
  conversion of Canal Unit 2 to burn natural gas as well as oil.  Federal and
  state income taxes decreased significantly during the current periods due
  mainly to the lower level of taxable income.  Local property and other
  taxes were higher during both periods due to higher property tax rates and
  assessments within the system's service territory and an increase in
  payroll-related taxes for Commonwealth Gas due to the 1996 labor dispute.

  Other Income and Interest Charges

      For the first nine months of 1997, other income decreased $3 million due
  primarily to the absence of a 1996 reversal of a reserve for costs
  associated with postretirement benefits ($1.8 million) following Federal
  Energy Regulatory Commission acceptance of rate schedules that provided for
  the recovery of these costs over a six-month period that began in March
  1996, the absence of a 1996 gain relating to the sale of parcels of land in

<PAGE 14>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

  1996 ($664,000) and lower interest and dividends ($404,000, including
  $279,000 relating to interest on deferred gas costs).

      The declines in total interest charges for the quarter and nine-month
  periods mainly reflect maturing long-term debt and scheduled sinking fund
  payments partially offset by higher average levels of borrowings.

  Personnel Reduction Program

      As initially discussed in the System's 1996 Annual Report on Form 10-K 
  filed with the Securities and Exchange Commission, the System announced the
  details of a system-wide voluntary Personnel Reduction Program (PRP) in May
  1997.  The goal of the PRP is to achieve a reduced, more efficient and more
  productive workforce in response to the significant regulatory changes
  facing the System.  This action followed the consolidation of the system's
  electric and gas operations.  The expectation is that the system's
  workforce will be reduced by 15% to 20%.

      The PRP was offered to substantially all regular and part-time employees
  of the system.  Eligibility for employees covered by collective bargaining
  agreements was subject to negotiation.

      The program provides severance based on years of service, the continu-
  ation of certain health and dental insurance for specified periods and
  limited reimbursement for certain educational and/or outplacement services.

      To date, approximately 13% of system employees have voluntarily
  terminated employment with the system as a result of the PRP.  The System
  estimates that the cost of termination benefits as described above,
  excluding generation-related costs that are being addressed separately as
  part of the industry restructuring process, will approximate $17.7 million
  which was recorded in the second quarter and had an after-tax income impact
  of approximately $10.7 million (50 cents per common share).  The payback
  period is expected to be less than one year.

  Electric Industry Restructuring

      On December 30, 1996 the DPU issued a final order announcing its "Model
  Rules and Legislative Proposal" as a guide in the creation of a competitive
  market for electric generation in Massachusetts.  Legislative proposals
  concerning electric industry restructuring were filed by the Governor of
  the Commonwealth of Massachusetts on February 24, 1997, and by the
  Massachusetts Legislature's Joint Committee on Electric Utility
  Restructuring on March 20, 1997 that ultimately evolved into the proposal
  issued on August 4, 1997 by the Senate Chairman of the Joint Committee on
  Government Regulations.  Additionally, during the past year, three
  Massachusetts electric utilities announced negotiated restructuring
  settlements with the Massachusetts Attorney General.  Generally, these
  original proposals and settlement agreements included, among other things,
  provisions for a 10% reduction in customer charges, divestiture of non-
  nuclear generating assets, recovery of stranded costs through a non-
  bypassable access charge and an implementation date of January 1, 1998.

      Subsequently, on October 3, 1997, the House Chairman of the Joint

<PAGE 15>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

  Committee on Government Regulations issued another proposal that included,
  among other things, a provision calling for a 15% reduction in rates for
  customers taking standard offer service from the utility over a seven-year
  period, the establishment of an auditing board within the DPU that would
  review the stranded costs that would be included in each company's non-
  bypassable access charge, unbundled rates as of January 1, 1998 and
  implementation of customer choice of energy supplier by March 1, 1998.

      On October 29, 1997, a joint proposal was filed by the chairpersons of
  the Joint Committee on Government Regulations which essentially reflected
  the provisions previously proposed.  This proposal was then forwarded to
  the Ways and Means Committee of the House of Representatives for further
  review and amendment.  The House Ways and Means Committee then sent the
  amended legislative proposal to the House of Representatives (the House). 
  On November 10, 1997, after a considerable number of additional amendments
  were made by members of the House, the legislation was passed in the House
  by a vote of 157 to 3.  Provisions of this legislation include, among other
  things, a 10% discount on standard offer service and retail choice of
  energy supplier effective March 1, 1998, with a subsequent increase in the
  discount on standard offer service to 15% upon completion of divestiture of
  non-nuclear generating assets and securitization of net non-mitigable
  stranded costs (which, for the system, are primarily the result of above-
  market purchased power contracts with non-utility generators); and,
  recovery of stranded costs subject to review and an audit process.  A
  Senate version of electric industry restructuring legislation is expected
  shortly.

      The proposed legislation is lengthy, complex and subject to change
  before it is finalized.  The system cannot yet determine the final impact
  on its operations and financial condition.  The final legislation must also
  be approved by the Massachusetts House and Senate and signed by the
  Governor of Massachusetts.  While the system is encouraged by the
  legislation's treatment of stranded cost recovery, the mandated customer
  discount could have a significant impact on future cash flows.  The system
  is preparing a proposed restructuring plan in anticipation of final
  legislation being enacted.

  Auction Process

      On March 31, 1997, the system submitted a report to the DPU which
  detailed the proposed auction process for selling its electric generation
  assets and entitlements.  The process includes a standard, sealed-bid
  auction for generation assets and purchased power contracts.  The auction
  process would provide a market-based approach to maximizing stranded cost
  mitigation and minimizing the access charges that ratepayers will have to
  pay for stranded cost recovery.  A request for bids from interested parties
  was issued during August and in October an Offering Memorandum was issued. 
  The system expects that the final bidders will be chosen by year-end and
  that the entire process, including regulatory approvals, will be completed
  no later than the end of 1998.

<PAGE 16>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

  Gas Industry Restructuring

      On July 18, 1997, the DPU directed the ten Massachusetts gas utilities,
  including Commonwealth Gas, to initiate a collaborative process that will
  establish guiding principles and specific procedures for unbundling rates
  and services for all customers.  The process has begun with meetings among
  the various interested parties.  A report is scheduled to be submitted to
  the DPU in mid-November.

      The DPU listed six principles that it considers important to the success
  of a competitive natural gas market that will provide safe and reliable
  service at the lowest possible cost to customers.  The natural gas market
  would: (1) provide the broadest possible choice; (2) provide all customers
  with an opportunity to share in the benefits of increased competition; (3)
  ensure full and fair competition in the gas supply market; (4) functionally
  separate supply from local distribution services; (5) support and further
  the goals of environmental regulation; and lastly (6) rely on incentive
  regulation where a fully competitive market cannot or presently does not
  exist.

      In addition, the DPU outlined several specific issues that it expects
  the collaborative to address: (1) services that can be offered on a
  competitive basis; (2) terms and conditions of service; (3) consumer
  protections and social programs; (4) mitigation of gas-related and non-gas
  related transition costs; (5) third-party supplier qualifications; and (6)
  curtailment principles.  The DPU also suggested that the collaborative
  reconsider the pricing and provision of interruptible transportation
  services.

      On August 18, 1997, the DPU noted that the development of unbundling
  principles and procedures constitutes only a part of the effort necessary
  to develop full customer choice for gas service.  The DPU recognized that
  each local distribution company will be filing a comprehensive unbundling
  proposal at some later date.  In the interim, the DPU directed those
  companies that do not currently have unbundled rates, including
  Commonwealth Gas, to have such rates in effect no later than November 1,
  1998.

  Provisions of Statement of Financial Accounting Standards No. 71

      As described in Note 2(b) of the Notes to Condensed Financial
  Statements, the system complies with the provisions of Statement of
  Financial Accounting Standards (SFAS) No. 71, "Accounting for the Effects
  of Certain Types of Regulation."  In the event the system is somehow unable
  to meet the criteria for following SFAS No. 71, the accounting impact would
  be an extraordinary, non-cash charge to operations in an amount that could
  be material.  Criteria that could give rise to the discontinuance of SFAS
  No. 71 include: 1) increasing competition restricting the system's ability
  to establish prices to recover specific costs, and 2) a significant change
  in the current manner in which rates are set by regulators.  The system
  monitors these criteria to ensure that the continuing application of SFAS
  No. 71 is appropriate.  Recently, the Securities and Exchange Commission
  has questioned the ability of certain utilities continuing the application

<PAGE 17>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

  of SFAS No. 71 where legislation provided for the transition to retail
  competition.  The issue of when and how to discontinue the application of
  SFAS No. 71 by utilities during transition to competition was referred to
  the Financial Accounting Standards Board's Emerging Issues Task Force and
  guidance was issued in July 1997.  Based on the current evaluation of the
  various factors and conditions that are expected to impact future cost
  recovery, the system believes that its utility operations remain subject to
  SFAS No. 71 and its regulatory assets, including those related to electric
  generation, remain probable of future recovery.

  Environmental Matters

      Commonwealth Gas is participating in the assessment of a number of
  former manufactured gas plant (MGP) sites and alleged MGP waste disposal
  locations to determine if and to what extent such sites have been
  contaminated and whether Commonwealth Gas may be responsible for remedial
  actions.  In April, Commonwealth Gas recorded an additional liability and
  corresponding regulatory asset of $1.2 million due to an increase in the
  site clean-up cost estimate for an MGP site for which Commonwealth Gas was
  previously cited as a Potentially Responsible Party.  The DPU has approved
  recovery of costs associated with MGP sites.  Commonwealth Gas is also
  involved in certain other known or potentially contaminated sites where the
  associated costs may not be recoverable in rates.  For further information
  on other related environmental matters, refer to the System's 1996 Annual
  Report on Form 10-K.

  New Accounting Standard

      The System is required to adopt Statement of Financial Accounting
  Standards No. 128 (SFAS 128) "Earnings per Share" for the year ended
  December 31, 1997.  SFAS 128 requires the presentation of both basic and
  diluted earnings per share (EPS).  Diluted EPS reflects the possible impact
  on EPS that could occur if securities or other contracts to issue common
  stock were exercised or converted into common stock or resulted in the
  issuance of common stock that then shared in the earnings of the entity.
  The System issued potential awards in the form of common shares to certain
  key employees pursuant to its Long Term Incentive Compensation Plan during
  the first quarter of 1997.  If SFAS 128 had been adopted for the three and
  nine-months ended September 30, 1997, both basic and diluted EPS would be
  $.32 and $1.46, respectively.

<PAGE 18>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES
                          PART II - OTHER INFORMATION

Item 1.     Legal Proceedings

       Cambridge Electric is an intervenor in a pending appeal at the
       Massachusetts Supreme Judicial Court (SJC) filed by the Massachusetts
       Institute of Technology (MIT) involving a DPU decision approving a
       customer transition charge (CTC) for the recovery of stranded
       investment costs.  On September 18, 1997, the SJC announced its
       decision remanding the matter to the DPU for further consideration. 
       The SJC stated that, although recovery of prudent and verifiable
       stranded costs by utility companies is in the public interest and
       consistent with the Public Utility Regulatory Policies Act, the
       insufficiencies of the DPU's subsidiary findings precluded the SJC
       from undertaking a meaningful review of the DPU's calculations that
       formed the basis of the customer transition charge.  Among the issues
       that the SJC directed the DPU to consider further are: the methodology
       for calculation of stranded costs, why 75% of stranded costs were
       allocated to MIT rather than 100%, the prudence of the stranded costs
       incurred by Cambridge Electric, and whether Cambridge Electric took
       the necessary mitigation efforts to reduce stranded costs.  With the
       SJC's remand of the order to the DPU, the parties have been discussing
       a standstill agreement.  The standstill agreement would not resolve
       questions about the ultimate level of CTC payments or what the final
       determination will be with respect to the CTC upon remand to the DPU. 
       The standstill agreement, if finalized and approved by the SJC, would
       govern the obligations of MIT to pay the CTC, subject to
       reconciliation, during the term of the DPU's remand proceeding.  This
       issue is discussed more fully in Cambridge Electric's 1996 Annual
       Report on Form 10-K.  At this time, management is unable to predict
       the outcome of this proceeding.

Item 2.     Changes in the Rights of the Company's Security Holders

       None

Item 3.     Defaults by the Company on its Senior Securities

       None

Item 4.     Results of Votes of Security Holders

       None

Item 5.     Other Information

       None

<PAGE 19>

              COMMONWEALTH ENERGY SYSTEM AND SUBSIDIARY COMPANIES

Item 6.      Exhibits and Reports on Form 8-K

       (a)   Exhibits

             Exhibit 27 - Financial Data Schedule

             Filed herewith as Exhibit 1 is the Financial Data Schedule for
             the nine months ended September 30, 1997.

             Filed herewith as Exhibit 2 is the restated Financial Data
             Schedule for the nine months ended September 30, 1996.

       (b)   Reports on Form 8-K

             No reports on Form 8-K were filed during the three months ended
             September 30, 1997.

<PAGE 20>


                          COMMONWEALTH ENERGY SYSTEM

                                  SIGNATURES

   Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



                                            COMMONWEALTH ENERGY SYSTEM
                                                  (Registrant)


                                            Principal Financial and
                                               Accounting Officer



                                            JAMES D. RAPPOLI             
                                            James D. Rappoli,
                                            Financial Vice President
                                              and Treasurer




Date:  November 14, 1997