As filed with the Securities and Exchange Commission on
                                December 13, 2000

                                File No. 70-9633

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                -------------------------------------------------

                        POST-EFFECTIVE AMENDMENT NO. 3 TO
                             APPLICATION-DECLARATION
                                   ON FORM U-1
                                    UNDER THE
                   PUBLIC UTILITY HOLDING COMPANY ACT OF 1935
                -------------------------------------------------
                               UNITIL CORPORATION
                            CONCORD ELECTRIC COMPANY
                        EXETER & HAMPTON ELECTRIC COMPANY
                    FITCHBURG GAS AND ELECTRIC LIGHT COMPANY
                               UNITIL POWER CORP.
                               6 Liberty Lane West
                        Hampton, New Hampshire 03842-1720
                ------------------------------------------------
                  (Name of companies filing this statement and
                     address of principal executive offices)

                               UNITIL CORPORATION
                               6 Liberty Lane West
                        Hampton, New Hampshire 03842-1720
                -------------------------------------------------
                 (Name of top registered holding company parent)

                                 Mark H. Collin
                                    Treasurer

                               UNITIL CORPORATION
                               6 Liberty Lane West
                        Hampton, New Hampshire 03842-1720
                -------------------------------------------------
                     (Name and address of agent for service)



                  The Commission is requested to mail copies of
                   all orders, notices and communications to:

                              William S. Lamb, Esq.
                     LeBoeuf, Lamb, Greene & MacRae, L.L.P.
                              125 West 55th Street
                            New York, New York 10019






     On June 9, 2000, Unitil Corporation, a New Hampshire corporation ("Unitil")
and a registered holding company under the Public Utility Holding Company Act of
1935, as amended (the "Act"), and its wholly owned subsidiary companies, Concord
Electric Company  ("Concord"),  Exeter & Hampton  Electric  Company  ("Exeter"),
Fitchburg  Gas and  Electric  Light  Company  ("Fitchburg"),  Unitil Power Corp.
("Unitil Power"), Unitil Realty Corp. ("Unitil Realty"),  Unitil Resources, Inc.
("Unitil  Resources") and Unitil Service Corp.  ("Unitil  Service" and, together
with  Concord,  Exeter,  Fitchburg,  Unitil  Power,  Unitil  Realty  and  Unitil
Resources, the "Subsidiaries" or "Money Pool Participants")/1, received approval
under the Act from the Securities and Exchange Commission (the "Commission") for
the authorization and approval under Sections 6(b), 7, 9(a), 10 and 12(b) of the
Act and the  Rules 43,  45 and 52  thereunder  with  respect  to (i)  short-term
borrowing by Unitil,  (ii)  short-term  borrowings  by  Fitchburg  and (iii) the
continued  use of the system money pool  ("Money  Pool") by Unitil and the Money
Pool Participants, pursuant to the Cash Pooling and Loan Agreement (the "Pooling
Agreement") among Unitil and the Money Pool Participants dated as of February 1,
1985, as amended, Holding Co. Act Release No. 27182 (the "Order").

     The Applicants hereby file this post effective  amendment  ("Amendment") to
their  application-declaration  on Form  U-1  relating  to the  above-referenced
transactions (the "Original  Application-Declaration") under the Act in order to
increase certain authorized borrowing amounts authorized in the Order.

ITEM 1.  DESCRIPTION OF PROPOSED TRANSACTIONS

     The Applicants  hereby submit this Amendment for authorization and approval
under  Sections  6(a), 7, 9(a), 10 and 12(b) of the Act and the Rules 43, 45 and
52  thereunder  to increase  Unitil's  authorized  short-term  borrowing  to $35
million  from $25  million.  Since  the  Commission  issued  the  Order,  Unitil
reevaluated  its financial  needs and  determined  that the Company will require
authority to issue up to $35 million in  short-term  debt to meet its  financing
needs prior to the completion of its 2001 long-term  financing  plans. As Unitil
finalized its long-term  financing plans for 2001, it determined that additional
borrowing  authority  would be  required  to give it the  financial  flexibility
needed to successfully complete its upcoming financing plans. Additionally, with
rising energy costs,  such an increase would assist it in meeting any short-term
payment timing differences that may occur in the future related to energy supply
costs. Unitil's Board of Directors authorized this short-term borrowing limit of
$35 million on September 29, 2000. (See Exhibit B-7)

     Any  borrowings  undertaken  pursuant  to this  authorization  will  remain
subject to the parameters  set forth in the Order,  except for the new aggregate
limit of $35 million.  While some of these  parameters are discussed or repeated
in this  Amendment,  the decision not to repeat or describe a specific aspect of
the Order or  Original  Application-Declaration  does not affect its  continuing
validity.  Applicants are not requesting an increase in borrowing  authority for
Fitchburg.

- ---------------
1    For purposes of this  Application-Declaration,  Unitil and Subsidiaries are
     collectively referred to as the "Applicants."

- ---------------

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     A. Short-Term Borrowings by Unitil

     Unitil expects to use the proceeds  derived from short-term bank borrowings
authorized by this Commission pursuant to this  application-declaration for: (i)
loans or advances to Subsidiaries through the Pooling Agreement, (ii) payment of
indebtedness,  (iii) short-term cash needs which may arise due to payment timing
differences,  (iv)  greater  flexibility  in  financial  planning and (iv) other
general purposes.

     When the Commission issued the Order,  Unitil had unsecured lines of credit
with BankBoston,  Fleet Bank New Hampshire and Citizens Bank New Hampshire;  the
agreements  are included as Exhibits B-2, B-3 and B-4  respectively,  which were
exemplary of forms of short-term notes proposed to be used by Unitil.  Since the
original notes were signed,  Fleet Bank and BankBoston  have merged,  with Fleet
Bank as the surviving  entity.  The previous  lines of credit have also expired.
Accordingly,  Unitil has  renegotiated  its lines of credit and as of October 9,
2000 had three  lines of credit:  a $16  million  unsecured  line of credit from
Fleet  National Bank  (attached as Exhibit B-8); a $5 million  unsecured line of
credit from  Citizens Bank New  Hampshire  (attached as Exhibit  B-9);  and a $4
million unsecured line of credit from Sovereign Bank of New England (attached as
Exhibit  B-10).   These  newer  letters  of  credit  and  promissory  notes  are
substantively  similar to the  exemplary  agreements  provided  in the  approved
Application-Declaration.

     Fleet  National  Bank has  granted  Unitil a line of credit  with a maximum
principal  amount of $16,000,000  through June 30, 2001.  Borrowings  under this
line of credit  will be priced at the  "Prime  Rate" or a "Money  Market"  rate.
"Prime Rate" means the variable  per annum rate of interest so  designated  from
time to time by the bank as its prime rate.  The Prime Rate is a reference  rate
and does not necessarily  represent the lowest or best rate being charged to any
customer. Each time the Prime Rate changes, the interest rate charged a customer
shall change contemporaneously with such change in the Prime Rate without notice
or demand of any kind.  "Money  Market  Rate" shall mean the  overnight  or term
money market  facilities  interest rate per annum which is  communicated  to the
borrower by the bank in respect of an advance.

     Pursuant to its arrangements  with Citizens Bank New Hampshire,  Unitil may
access a line of credit up to $5,000,000  through  August 31, 2001.  Loans under
this line of credit will bear interest at the "Alternate Base Rate" which is the
London Interbank  Offered Rate ("LIBOR") for the term of the loan (not to exceed
ninety  days as in  effect  on the date of the  loan)  plus  four-tenths  of one
percent per annum.

     Sovereign  Bank of New England  ("Sovereign")  has granted Unitil a line of
credit with a maximum  principal  amount of  $4,000,000  through  June 30, 2001.
Borrowings  under this  facility  will accrue  interest at Sovreign  Bank of New
England's  "Prime  Rate," or the "LIBOR  Rate," or the "Cost of Funds  Rate," as
elected by Unitil. As in the credit arrangement with Fleet National Bank, "Prime
Rate" means the variable per annum rate of interest so  designated  from time to
time by Sovereign as its prime rate. The Prime Rate is a reference rate and does
not necessarily represent the lowest or best rate being charged


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to any customer.  Each time the Prime Rate changes,  the interest rate charged a
customer  shall  change  contemporaneously  with such  change in the Prime  Rate
without notice or demand of any kind.

     The "LIBOR Rate" is the LIBOR plus a margin determined by Sovereign.  LIBOR
means (i) a rate per annum (rounded upward,  if necessary),  to the nearest 1/32
of one percent))  equal to the  composite  London  Interbank  Offered Rate which
appears on the Telerate page 3750 as of 11:00 am. London time on the day that is
two (2) London  Banking Days  preceding the first day of such LIBOR  Period,  as
defined in the line of credit,  (or if not reported thereon,  then as determined
by the bank from another  recognized source or interbank  quotation)  divided by
(ii) a fraction (A) the numerator of which is one and (B) the denominator is the
average  of the  daily  rates  (expressed  as a  decimal)  for  maximum  reserve
requirements  which  are,  at any time,  applicable  during  such  LIBOR  Period
(including,  without  limitation,  basic  supplemental,  special,  marginal  and
emergency  reserves)  under  any  regulation  of the Board of  Governors  of the
Federal Reserve System or other banking authority,  domestic or foreign,  as now
or hereafter in effect,  prescribed for eurocurrency funding (currently referred
to as Eurocurrency Liabilities in Regulation D of such Board) to which Sovereign
(including any branch,  affiliate, or other fronting office, making or holding a
loan that accrues  interest at a rate which refers to LIBOR) is subject,  as now
or hereafter in effect.

     The "Cost of Funds Rate" is the "Cost of Funds" plus a margin determined by
Sovereign.  "Cost of Funds" means the per annum rate of interest which Sovereign
is required to pay, or is offering to pay, for wholesale  liabilities,  adjusted
for  reserve  requirement  and such  other  requirements  as may be  imposed  by
federal,  state or local  government and regulatory  agencies,  as determined by
Sovereign Treasury Group, or its successors.

     As  discussed  in the  Original  Application-Declaration,  Unitil  requests
authority  to secure  both  formal and  informal  credit  lines with a number of
lending  institutions.  Formal credit lines under the proposed facilities may be
subject to compensating  balances and/or fee requirements.  Compensating balance
requirements  will not exceed 5% of the committed  credit line amount,  and fees
will not exceed 50 basis points times the total line of credit per annum. Unitil
may change its credit line arrangements and obtain additional formal or informal
credit lines over time.

     Unitil has also amended the Pooling  Agreement  to allow Unitil  Resources,
Inc. to  participate  in the Money Pool,  and the amended  Pooling  Agreement is
attached as Exhibit B-1.

     B.   Involvement  with Exempt  Wholesale  Generators  and  Foreign  Utility
          Companies

     The proposed transactions are not subject to Rules 53 and 54 under the Act.
Neither Unitil nor any Subsidiary  thereof presently has, or as a consequence of
the  proposed  transactions  will have,  an  interest  in any  exempt  wholesale
generator  ("EWG") or  foreign  utility  company  ("FUCO"),  as those  terms are
defined in Sections  32 and 33 of the Act,  respectively.  None of the  proceeds
from the proposed transactions will be used to acquire any securities of, or any
interest


                                       3







in, an EWG or FUCO. Moreover,  neither Unitil nor any of the Subsidiaries is, or
as a consequence of the proposed  transactions will become, a party to, and such
entities  do not and will  not  have  any  rights  under,  a  service,  sales or
construction  contract  with any  affiliated  EWGs or FUCOs except in accordance
with the  rules and  regulations  promulgated  by the  Commission  with  respect
thereto.  Consequently,  all applicable requirements of Rule 53(a)-(c) under the
Act are satisfied as required by Rule 54 under the Act.

ITEM 2.  FEES, COMMISSIONS AND EXPENSES

     The fees, commissions and expenses of the Applicants expected to be paid or
incurred,  directly or indirectly, in connection with the transactions described
above are estimated as follows:

Legal fees                     .......................................... $5,000
Miscellaneous                  .......................................... $3,000
                        Total  .......................................... $8,000

ITEM 3.  APPLICABLE STATUTORY PROVISIONS

     Sections  6(a),  7, 9(a),  10 and 12(b) of the Act, and Rules 43, 45 and 52
thereunder, are directly applicable to this Application-Declaration.

ITEM 4.  REGULATORY APPROVALS

     No state or federal agency other than the Commission has jurisdiction  with
respect to any of the  proposed  transactions  other than as  described  in this
item.

ITEM 5.  PROCEDURE

     It is  requested  that the  Commission  issue  and  publish  no later  than
November  6, 2000,  the  requisite  notice  under  Rule 23 with  respect to this
Application-Declaration;  such notice specifying December 1, 2000 as the date by
which  comments  may be  entered  and the date on which  an order  granting  and
permitting the Application-Declaration to become effective may be entered by the
Commission  and that the  Commission  enter not later than December 15, 2000, an
appropriate order granting and permitting this Application-Declaration to become
effective.

     The Applicants  respectfully  request that appropriate and timely action be
taken by the  Commission in this matter.  No  recommended  decision by a hearing
officer or other responsible  officer of the Commission is necessary or required
in this matter.  The Division of  Investment  Management of the  Commission  may
assist in the  preparation of the  Commission's  decision in this matter.  There
should be no thirty-day  waiting  period between the issuance and effective date
of any order issued by the  Commission  in this matter,  and it is  respectfully
requested  that any such  order be made  effective  immediately  upon the  entry
thereof.


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ITEM 6.  EXHIBITS AND FINANCIAL STATEMENTS

         a)  Exhibits

             Exhibit No.                    Description of Exhibit
             -----------                    ----------------------

                 B-1               Cash Pooling and Loan Agreement, as amended
                                   (Previously Filed).

                 B-2               Line of Credit and Promissory Note from
                                   BankBoston dated July 29, 1999
                                   (Previously Filed).

                 B-3               Line of Credit and Promissory Note from Fleet
                                   Bank-New Hampshire dated July 30, 1998
                                   (Previously Filed).

                 B-4               Line of Credit and Promissory Note from
                                   Citizens Bank New Hampshire dated September
                                   20, 1999 (Previously Filed).

                 B-5               Withdrawn.

                 B-6               Resolutions of Fitchburg Board of  Directors
                                   authorizing short-term borrowing limits
                                   (Filed as Exhibit B-6 Form U-1 File No. 9053
                                   and incorporated by reference herein).

                 B-7               Resolutions of Unitil Board of Directors
                                   authorizing short-term borrowing limits dated
                                   October 3, 2000 (Previously Filed).

                 B-8               Line of Credit and Promissory Note from Fleet
                                   National Bank dated September 18, 2000
                                   (Previously Filed).

                 B-9               Line of Credit and Promissory Note from
                                   Citizens Bank New Hampshire dated August 30,
                                   2000 (Previously Filed).

                 B-10              Line of Credit and  Promissory  Note from
                                   Sovereign Bank of New England dated September
                                   25, 2000 (Previously Filed).

                 D-1               New Hampshire Public Utilities Commission
                                   Order No. 18,416 (Filed with the Commission
                                   as Exhibit D-3 to Form U-1 File  No. 70-8066
                                   and incorporated by reference herein).


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                 D-2               New Hampshire Public Utilities Commission
                                   Order No. 17,373 (Filed with the Commission
                                   as Exhibit D-4 to Form U-1 File No. 70-8066
                                   and incorporated by reference herein).

                 D-3               Massachusetts Department of Public Utilities
                                   Commission Order No. MDPU 89-66 (Filed with
                                   the Commission as Exhibit D-5 to Form U-1
                                   File No. 70-8066  and  incorporated  by
                                   reference herein).

                 F-1               Opinion of Counsel (Previously Filed).

                 F-2               "Past Tense" Opinion of Counsel. (To be filed
                                   by Amendment).

                 G-1               Financial Data Schedule (Previously Filed).

                 H-2               Proposed Form of Notice (Previously Filed).

         b)  Financial Statements

                 No.               Description of Financial Statement

                 FS-1              Unitil  Corporation  and Subsidiary Companies
                                   Consolidated Actual  and  Pro  Forma  Balance
                                   Sheets and Statement of Earnings, June 30,
                                   2000 (Previously Filed).

                 FS-2              Unitil  Corporation  and Subsidiary Companies
                                   Consolidated Actual Balance Sheets and
                                   Statement of Earnings,  June 30, 2000 (Filed
                                   with the  Commission  with Unitil's 10-Q for
                                   the period  ended June 30, 2000 and
                                   incorporated  by  reference herein).

                 FS-3              Unitil  Corporation  (Company  Only)  Actual
                                   and Pro Forma Balance Sheets and Statement of
                                   Earnings, June 30, 2000 (revised) (Previously
                                   Filed).

                 FS-4              Fitchburg  Actual and Pro Forma Balance Sheet
                                   and Statement of Earnings, June 30, 2000
                                   (Previously Filed).

                 FS-5              Concord  Electric  Company  Balance Sheet and
                                   Statement of Earnings, September 30, 1999
                                   (Previously Filed).


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                 FS-6              Exeter  &  Hampton Electric Company  Balance
                                   Sheet  and Statement  of  Earnings, September
                                   30,  1999  (Previously Filed).

ITEM 7.  INFORMATION AS TO ENVIRONMENTAL EFFECTS

     None of the matters  that are the  subject of this  Application-Declaration
involve a "major federal action" nor do they  "significantly  affect the quality
of the human  environment"  as those terms are used in Section  102(2)(C) of the
National  Environmental  Policy Act. None of the proposed  transactions that are
the  subject  of this  Application-Declaration  will  result in  changes  in the
operation of the  Applicants  that will have an impact on the  environment.  The
Applicants  are not  aware  of any  federal  agency  which  has  prepared  or is
preparing an  environmental  impact  statement with respect to the  transactions
proposed herein.

                                    SIGNATURE

     Pursuant to the  requirements  of the Public Utility Holding Company Act of
1935, the Applicants have duly caused this  Application-Declaration to be signed
on their behalf by the undersigned thereunto duly authorized.

Dated:   December 13, 2000

                                       UNITIL CORPORATION


                                       By: /s/ Mark H. Collin
                                          -------------------
                                       Name:    Mark H. Collin
                                       Title:   Treasurer





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