Document:

<PAGE>

                                                                   EXHIBIT 10.28

                THIRD AMENDMENT TO CREDIT AND SECURITY AGREEMENT

         This Amendment, dated as of November 13, 2003, is made by and between
METRETEK, INCORPORATED, a Florida corporation (the "Borrower"), and WELLS FARGO
BUSINESS CREDIT, INC., a Minnesota corporation (the "Lender").

                                    RECITALS

         The Borrower and the Lender are parties to a Credit and Security
Agreement dated as of September 6, 2002, as amended by (i) a First Amendment to
Credit and Security Agreement and Waiver of Defaults dated as of March 26, 2003
and (ii) a Second Amendment to Credit and Security Agreement dated as of
September 24, 2003 (as so amended, the "Credit Agreement"). Capitalized terms
used in these recitals have the meanings given to them in the Credit Agreement
unless otherwise specified.

         The Borrower has requested that certain amendments be made to the
Credit Agreement, which the Lender is willing to make pursuant to the terms and
conditions set forth herein.

         NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements herein contained, it is agreed as follows:

         1.       Defined Terms. Capitalized terms used in this Amendment which
are defined in the Credit Agreement shall have the same meanings as defined
therein, unless otherwise defined herein.

         2.       Section 6.2(c). Section 6.2(c) of the Credit Agreement is
amended and restated in its entirety to read as follows:

                  "(c)     CAPITAL EXPENDITURES. The Borrower will not incur or
contract to incur unfinanced Capital Expenditures of more than $750,000 in the
aggregate during the fiscal year ending December 31, 2003."

         3.       Exhibit B. Exhibit B of the Credit Agreement is amended and
restated in its entirety and replaced with Exhibit B attached hereto.

         4.       No Other Changes. Except as explicitly amended by this
Amendment, all of the terms and conditions of the Credit Agreement shall remain
in full force and effect and shall apply to any advance or letter of credit
thereunder.

         5.       Conditions Precedent. This Amendment shall be effective when
the Lender shall have received an executed original hereof, together with each
of the following, each in substance and form acceptable to the Lender in its
sole discretion:

                  (a)      The Acknowledgment and Agreement of Guarantors and
the Acknowledgment and Agreement of Subordinated Creditor set forth at the end
of this Amendment, duly executed by each Guarantor and Subordinated Creditor.

                  (b)      Such other matters as the Lender may require.

         6.       Representations and Warranties. The Borrower hereby represents
and warrants to the Lender as follows:

                  (a)      The Borrower has all requisite power and authority to
execute this Amendment and to perform all of its obligations hereunder, and this
Amendment has been duly executed and delivered by the Borrower and constitutes
the legal, valid and binding obligation of the Borrower, enforceable in
accordance with its terms.

                                        1
<PAGE>

                  (b)      The execution, delivery and performance by the
Borrower of this Amendment has been duly authorized by all necessary corporate
action and does not (i) require any authorization, consent or approval by any
governmental department, commission, board, bureau, agency or instrumentality,
domestic or foreign, (ii) violate any provision of any law, rule or regulation
or of any order, writ, injunction or decree presently in effect, having
applicability to the Borrower, or the articles of incorporation or by-laws of
the Borrower, or (iii) result in a breach of or constitute a default under any
indenture or loan or credit agreement or any other agreement, lease or
instrument to which the Borrower is a party or by which it or its properties may
be bound or affected.

                  (c)      All of the representations and warranties contained
in Article V of the Credit Agreement are correct on and as of the date hereof as
though made on and as of such date, except to the extent that such
representations and warranties relate solely to an earlier date.

         7.       References. All references in the Credit Agreement to "this
Agreement" shall be deemed to refer to the Credit Agreement as amended hereby;
and any and all references in the Security Documents to the Credit Agreement
shall be deemed to refer to the Credit Agreement as amended hereby.

         8.       No Other Waiver. The execution of this Amendment and
acceptance of any documents related hereto shall not be deemed to be a waiver of
any Default or Event of Default under the Credit Agreement or breach, default or
event of default under any Security Document or other document held by the
Lender, whether or not known to the Lender and whether or not existing on the
date of this Amendment.

         9.       Release. The Borrower, and each Guarantor by signing the
Acknowledgment and Agreement of Guarantors set forth below, and the Subordinated
Creditor by signing the Acknowledgment and Agreement of Subordinated Creditor
set forth below, each hereby absolutely and unconditionally releases and forever
discharges the Lender, and any and all participants, parent corporations,
subsidiary corporations, affiliated corporations, insurers, indemnitors,
successors and assigns thereof, together with all of the present and former
directors, officers, agents and employees of any of the foregoing, from any and
all claims, demands or causes of action of any kind, nature or description,
whether arising in law or equity or upon contract or tort or under any state or
federal law or otherwise, which the Borrower or such Guarantor or such
Subordinated Creditor has had, now has or has made claim to have against any
such person for or by reason of any act, omission, matter, cause or thing
whatsoever arising from the beginning of time to and including the date of this
Amendment, whether such claims, demands and causes of action are matured or
unmatured or known or unknown.

         10.      Costs and Expenses. The Borrower hereby reaffirms its
agreement under the Credit Agreement to pay or reimburse the Lender on demand
for all costs and expenses incurred by the Lender in connection with the Loan
Documents, including without limitation all reasonable fees and disbursements of
legal counsel. Without limiting the generality of the foregoing, the Borrower
specifically agrees to pay all fees and disbursements of counsel to the Lender
for the services performed by such counsel in connection with the preparation of
this Amendment and the documents and instruments incidental hereto. The Borrower
hereby agrees that the Lender may, at any time or from time to time in its sole
discretion and without further authorization by the Borrower, make a loan to the
Borrower under the Credit Agreement, or apply the proceeds of any loan, for the
purpose of paying any such fees, disbursements, costs and expenses.

         11.      Miscellaneous. This Amendment and the Acknowledgment and
Agreement of Guarantors and the Acknowledgment and Agreement of Subordinated
Creditor may be executed in any number of counterparts, each of which when so
executed and delivered shall be deemed an original and all of which
counterparts, taken together, shall constitute one and the same instrument.

                                        2
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the date first written above.

WELLS FARGO BUSINESS CREDIT, INC.                METRETEK, INCORPORATED

By:    /s/ Patti Scudder                         By:   /s/ A. Bradley Gabbard
       -------------------------------------           ----------------------
Name:  Patti Scudder                             Name: A. Bradley Gabbard
Its:   Commercial Banking Officer                Its:  Chief Financial Officer

                                        3<PAGE>
                                                                   EXHIBIT 10.29

                FOURTH AMENDMENT TO CREDIT AND SECURITY AGREEMENT
                             AND WAIVER OF DEFAULTS

         This Amendment, dated as of March 24, 2004, is made by and between
METRETEK, INCORPORATED, a Florida corporation (the "Borrower"), and WELLS FARGO
BUSINESS CREDIT, INC., a Minnesota corporation (the "Lender").

                                    Recitals

         The Borrower and the Lender are parties to a Credit and Security
Agreement dated as of September 6, 2002, as amended by (i) a First Amendment to
Credit and Security Agreement and Waiver of Defaults dated as of March 26, 2003;
(ii) a Second Amendment to Credit and Security Agreement dated as of September
24, 2003; and (iii) a Third Amendment to Credit and Security Agreement dated as
of November 13, 2003 (as so amended, the "Credit Agreement"). Capitalized terms
used in these recitals have the meanings given to them in the Credit Agreement
unless otherwise specified.

         The Borrower has requested that certain amendments be made to the
Credit Agreement, which the Lender is willing to make pursuant to the terms and
conditions set forth herein.

         NOW, THEREFORE, in consideration of the premises and of the mutual
covenants and agreements herein contained, it is agreed as follows:

         1. Defined Terms. Capitalized terms used in this Amendment which are
defined in the Credit Agreement shall have the same meanings as defined therein,
unless otherwise defined herein.

         2. Section 6.2(a). Section 6.2(a) of the Credit Agreement is amended
and restated in its entirety to read as follows:

                  "(a) MINIMUM TANGIBLE NET WORTH. The Borrower will maintain,
         during each period described below, its Tangible Net Worth, less (i)
         software development and (ii) intercompany indebtedness owing from all
         Corporate Guarantors to Borrower, determined as at the end of each
         month, at an amount not less than the amount set forth opposite such
         period (numbers appearing between "< >" are negative):

                                       1
<PAGE>
<TABLE>
<CAPTION>
                                               Period                        Minimum Tangible Net Worth
                                       ----------------------                --------------------------
<S>                                    <C>                                     <C>
                                          March 31, 2004                             $938,000
                                          April 30, 2004                             $891,000
                                           May 31, 2004                              $851,000
                                           June 30, 2004                             $901,000
                                           July 31, 2004                             $991,000
                                          August 31, 2004                          $1,166,000
                                         September 30, 2004                        $1,276,000
                                          October 31, 2004                         $1,454,000
                                         November 30, 2004                         $1,554,000
                                 December 31, 2004 and thereafter                  $1,629,000"
</TABLE>

         3. Section 6.2(b). Section 6.2(b) of the Credit Agreement is amended
and restated in its entirety to read as follows:

                 "(b) Minimum Net Income. The Borrower will achieve during each
         period described below, its Net Income, of not less than the amount set
         forth opposite such period (numbers appearing between "<>" are
         negative):

<TABLE>
<CAPTION>
                                          Period                          Minimum Net Income
                                 ------------------------                 ------------------
<S>                               <C>                                <C>
                                     March 31, 2004                              <$516,000>
                                     April 30, 2004                              <$563,000>
                                      May 31, 2004                               <$603,000>
                                      June 30, 2004                              <$553,000>
                                      July 31, 2004                              <$463,000>
                                     August 31, 2004                             <$288,000>
                                   September 30, 2004                            <$178,000>
                                    October 31, 2004                                    $0
                                    November 30, 2004                             $100,000
                                    December 31, 2004                             $175,000"
</TABLE>

         4. Section 6.2(c). Section 62(c) of the Credit Agreement is amended and
restated in its entirety to read as follows:

            "(c) Capital Expenditures. The Borrower will not incur or contract
to incur Capital Expenditures of more than $700,000 in the aggregate during the
fiscal year ending December 31, 2004."

         5. Section 6.27. Section 6,27 of the Credit Agreement is amended and
restated in its entirety to read as follows:

                  "Section 6.27 Advances to Corporate Guarantors, Before making
an advance to any Corporate Guarantor, and after making such advance to any
Corporate Guarantor, availability shall not be less than $100,000. Before making
any repayment to any Corporate Guarantor on an existing advance, and after
making such repayment to any Corporate Guarantor, availability

                                       2
<PAGE>

shall not be less than $100,000. Advances to Corporate Guarantors and
repayments to Corporate Guarantors on existing advances shall not exceed
$400,000 in the aggregate during the fiscal year ending December 31, 2004."

         6. Exhibit B. Exhibit B of the Credit Agreement is amended and restated
in its entirety and replaced with Exhibit B attached hereto.

         7. No Other Changes. Except as explicitly amended by this Amendment,
all of the terms and conditions of the Credit Agreement shall remain in full
force and effect and shall apply to any advance or letter of credit thereunder.

         8. Waiver of Defaults. The Borrower is in default under Section 62(a)
Minimum Tangible Net Worth and Section 6.2(b) Minimum Net Income of the Credit
Agreement as of December 31, 2003 (collectively, the "Existing Defaults"). Upon
the terms and subject to the conditions set forth in this Amendment, the Lender
hereby waives the Existing Defaults. This waiver shall be effective only in this
specific instance and for the specific purpose for which it is given, and this
waiver shall not entitle the Borrower to any other or further waiver in any
similar or other circumstances.

         9. Amendment Fee. The Borrower shall pay the Lender as of the date
hereof a fully earned, non-refundable fee in the amount of $2,000 in
consideration of the Lender's execution and delivery of this Amendment.

         10. Conditions Precedent. This Amendment, and the waiver set forth in
Paragraph 8 hereof, shall be effective when the Lender shall have received an
executed original hereof, together with each of the following, each in substance
and form acceptable to the Lender in its sole discretion:

         (a) The Acknowledgment and Agreement of Guarantors and the
Acknowledgment and Agreement of Subordinated Creditor set forth at the end of
this Amendment, duly executed by each Guarantor and Subordinated Creditor.

         (b) Payment of the fee described in Paragraph 9.

         (c) Such other matters as the Lender may require.

         11. Representations and Warranties, The Borrower hereby represents and
warrants to the Lender as follows:

             (a) The Borrower has all requisite power and authority to execute
this Amendment and to perform all of its obligations hereunder, and this
Amendment has been duly executed and delivered by the Borrower and constitutes
the legal, valid and binding obligation of the Borrower, enforceable in
accordance with its terms.

                                       3
<PAGE>

                  (b) The execution, delivery and performance by the Borrower of
this Amendment has been duly authorized by all necessary corporate action and
does not (i) require any authorization, consent or approval by any governmental
department, commission, board, bureau, agency or instrumentality, domestic or
foreign, (ii) violate any provision of any law, rule or regulation or of any
order, writ, injunction or decree presently in effect, having applicability to
the Borrower, or the articles of incorporation or by-laws of the Borrower, or
(iii) result in a breach of or constitute a default under any indenture or loan
or credit agreement or any other agreement, lease or instrument to which the
Borrower is a party or by which it or its properties may be bound or affected.

                  (c) All of the representations and warranties contained in
Article V of the Credit Agreement are correct on and as of the date hereof as
though made on and as of such date, except to the extent that such
representations and warranties relate solely to an earlier date.

         12. References. All references in the Credit Agreement to "this
Agreement" shall be deemed to refer to the Credit Agreement as amended hereby;
and any and all references in the Security Documents to the Credit Agreement
shall be deemed to refer to the Credit Agreement as amended hereby.

         13. No Other Waiver. Except as set forth in Paragraph 8 hereof, the
execution of this Amendment and acceptance of any documents related hereto shall
not be deemed to be a waiver of any Default or Event of Default under the Credit
Agreement or breach, default or event of default under any Security Document or
other document held by the Lender, whether or not known to the Lender and
whether or not existing on the date of this Amendment.

         14. Release. The Borrower, and each Guarantor by signing the
Acknowledgment and Agreement of Guarantors set forth below, and the Subordinated
Creditor by signing the Acknowledgment and Agreement of Subordinated Creditor
set forth below, each hereby absolutely and unconditionally releases and forever
discharges the Lender, and any and all participants, parent corporations,
subsidiary corporations, affiliated corporations, insurers, indemnitors,
successors and assigns thereof, together with all of the present and former
directors, officers, agents and employees of any of the foregoing, from any and
all claims, demands or causes of action of any kind, nature or description,
whether arising in law or equity or upon contract or tort or under any state or
federal law or otherwise, which the Borrower or such Guarantor or such
Subordinated Creditor has had, now has or has made claim to have against any
such person for or by reason of any act, omission, matter, cause or thing
whatsoever arising from the beginning of time to and including the date of this
Amendment, whether such claims, demands and causes of action are matured or
unmatured or known or unknown.

                                       4
<PAGE>
         15. Costs and Expenses. The Borrower hereby reaffirms its agreement
under the Credit Agreement to pay or reimburse the Lender on demand for all
costs and expenses incurred by the Lender in connection with the Loan Documents,
including without limitation all reasonable fees and disbursements of legal
counsel. Without limiting the generality of the foregoing, the Borrower
specifically agrees to pay all fees and disbursements of counsel to the Lender
for the services performed by such counsel in connection with the preparation of
this Amendment and the documents and instruments incidental hereto. The Borrower
hereby agrees that the Lender may, at any time or from time to time in its sole
discretion and without further authorization by the Borrower, make a loan to the
Borrower under the Credit Agreement, or apply the proceeds of any loan, for the
purpose of paying any such fees, disbursements, costs and expenses and the fee
required under Paragraph 9 hereof.

         16. Miscellaneous. This Amendment and the Acknowledgment and Agreement
of Guarantors and the Acknowledgment and Agreement of Subordinated Creditor may
be executed in any number of counterparts, each of which when so executed and
delivered shall be deemed an original and all of which counterparts, taken
together, shall constitute one and the same instrument..

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the date first written above.

WELLS FARGO BUSINESS CREDIT, INC.            METRETEK, INCORPORATED

By: /s/ Patti Scudder                        By: /s/ A. Bradley Gabbard
    -------------------------------------        ------------------------------
Name: Patti Scudder                          Name: A. Bradley Gabbard
Its:  Commercial Banking Officer             Its:  Chief Financial Officer

                                       5
<PAGE>
                                      Exhibit B to Credit and Security Agreement

                             Compliance Certificate

To:               Wells Fargo Business Credit, Inc.
Date:             ___________________, 200__
Subject:          Financial Statements

         In accordance with our Credit and Security Agreement dated as of
September 6, 2002, as amended by (i) a First Amendment to Credit and Security
Agreement and Waiver of Defaults dated as of March 26, 2003; (ii) a Second
Amendment to Credit and Security Agreement dated as of September 24, 2003; (iii)
a Third Amendment to Credit and Security Agreement dated as of November 13,
2003; and (iv) a Fourth Amendment to Credit and Security Agreement and Waiver of
Defaults dated as of March 24, 2004 (as so amended, the "Credit Agreement"),
attached are the financial statements of Metretek, Incorporated (the "Borrower")
as of and for , 200_ (the "Reporting Date") and the year-to-date period then
ended (the "Current Financials"), all terms used in this certificate have the
meanings given in the Credit Agreement.

         I certify that the Current Financials have been prepared in accordance
with GAAP, subject to year-end audit adjustments, and fairly present the
Borrower's financial condition as of the date thereof.

         Events of Default. (Check one):
         ------------------

         |_|     The undersigned does not have knowledge of the occurrence of a
                 Default or Event of Default under the Credit Agreement except
                 as previously reported in writing to the Lender.

         |_|      The undersigned has knowledge of the occurrence of a Default
                  or Event of Default under the Credit Agreement not previously
                  reported in writing to the Lender and attached hereto is a
                  statement of the facts with respect to thereto. The Borrower
                  acknowledges that pursuant to Section 2,8(c) of the Credit
                  Agreement, the Lender may impose the Default Rate at any time
                  during the resulting Default Period.

         Financial Covenants. I further hereby certify as follows:
         -------------------

         1. MINIMUM TANGIBLE NET WORTH. Pursuant to Section 6.2(a) of the Credit
Agreement, as of the Reporting Date the Borrower's Tangible Net Worth, less (a)
software development and (b) intercompany indebtedness owing from all Corporate
Guarantors to Borrower, was $______________________________ which |_| satisfies
|_| does not satisfy the requirement that such amount be not less than
$____________________on the Reporting Date as set forth in the table below
(numbers appearing between "<>" are negative):

                                       1
<PAGE>
<TABLE>
<CAPTION>
                               Period                              Minimum Tangible Net
                      --------------------                         --------------------
<S>                                                                <C>
                          March 31, 2004                                  $938,000
                          April 30, 2004                                  $891,000
                           May 31, 2004                                   $851,000
                          June 30, 2004                                   $901,000
                          July 31, 2004                                   $991,000
                         August 31, 2004                                $1,166,000
                       September 30, 2004                               $1,276,000
                         October 31, 2004                               $1,454,000
                       November 30, 2004                                $1,554,000
               December 31, 2004 and thereafter                         $1,629,000 "
</TABLE>

         2. MINIMUM NET INCOME. Pursuant to Section 6.2(b) of the Credit
Agreement, the Borrower's Net Income for the__________________period ending on
the Reporting Date, was $_____________________ which |_| satisfies |_| does not
satisfy the requirement that such amount be not less than
$___________________________during such period as set forth in the table below
(numbers appearing between "<>" are negative):

<TABLE>
<CAPTION>
                                Period                                       Minimum Net Income
                        --------------------                                 ------------------
<S>                       <C>                                                 <C>
                            March 31, 2004                                        <$516,000>
                            April 30, 2004                                        <$563,000>
                             May 31, 2004                                         <$603,000>
                            June 30, 2004                                         <$553,000>
                            July 31, 2004                                         <$463,000>
                           August 31, 2004                                        <$288,000>
                          September 30, 2004                                      <$178,000>
                          October 31, 2004                                               $0
                          November 30, 2004                                        $100,000
                          December 31, 2004                                        $175,000 "
</TABLE>

         3. CAPITAL EXPENDITURES. Pursuant to Section 62(c) of the Credit
Agreement, for the year-to-date period ending on the Reporting Date, the
Borrower has expended or contracted to expend during the fiscal year ended
December 31, 2004, for Capital Expenditures, $ in the aggregate, which |_|
satisfies |_| does not satisfy the requirement that such expenditures not exceed
$700,000 in the aggregate during such year.

         4. SALARIES. As of the Reporting Date, the Borrower |_| is |_| is not
in compliance with Section 6.8 of the Credit Agreement concerning salaries.

                                       2
<PAGE>
         5. ADVANCES TO CORPORATE GUARANTORS. Pursuant to Section 6.27 of the
Credit Agreement, for the year-to-date period ending on the Reporting Date, the
Borrower has advanced to Corporate Guarantors or has repaid Corporate Guarantors
on existing advances, during the fiscal year ended December 31, 2004,
$__________________ in the aggregate, which |_| satisfies |_| does not satisfy
the requirement that such advances not exceed $400,000 in the aggregate during
such year.

        Attached hereto are all relevant facts in reasonable detail to evidence,
and the computations of the financial covenants referred to above. These
computations were made in accordance with GAAP.

                             By:___________________________________________
                                            Its Chief Financial Officer

                                       3
<PAGE>
                   ACKNOWLEDGMENT AND AGREEMENT OF GUARANTORS

        The undersigned, each a guarantor of the indebtedness of Metretek,
Incorporated (the "Borrower") to Wells Fargo Business Credit, Inc. (the
"Lender") pursuant to a separate Guaranty dated as of September 6, 2002 (the
"Guaranty"), each hereby (i) acknowledges receipt of the foregoing Amendment;
(ii) consents to the terms (including without limitation the release set forth
in Paragraph 14 of the Amendment) and execution thereof; (iii) reaffirms its
obligations to the Lender pursuant to the terms of its Guaranty; and (iv)
acknowledges that the Lender may amend, restate, extend, renew or otherwise
modify the Credit Agreement and any indebtedness or agreement of the Borrower,
or enter into any agreement or extend additional or other credit accommodations,
without notifying or obtaining the consent of the undersigned and without
impairing the liability of the undersigned under its Guaranty for all of the
Borrower's present and future indebtedness to the Lender.

METRETEK CONTRACT MANUFACTURING      METRETEK TECHNOLOGIES, INC.
COMPANY, INC.

By: /s/ A. Bradley Gabbard           By: /s/ A. Bradley Gabbard
    -----------------------------        -------------------------------------
Name: A. Bradley Gabbard                     Name: A. Bradley Gabbard
Its:      Chief Financial Officer            Its:     Executive Vice President

POWERSECURE, INC.                            SOUTHERN FLOW COMPANIES, INC

By: /s/ A. Bradley Gabbard           By: /s/ A. Bradley Gabbard
    -----------------------------        -------------------------------------
Name: A. Bradley Gabbard                     Name: A. Bradley Gabbard
Its:      Chief Financial Officer            Its:     Chief Financial Officer

                                       4
<PAGE>
              ACKNOWLEDGMENT AND AGREEMENT OF SUBORDINATED CREDITOR

         The undersigned, a subordinated creditor of Metretek, Incorporated (the
"Borrower") to Wells Fargo Business Credit, Inc. (the "Lender") pursuant to a
Subordination Agreement dated as of September 6, 2002 (the "Subordination
Agreement"), hereby (i) acknowledges receipt of the foregoing Amendment; (ii)
consents to the terms (including without limitation the release set forth in
Paragraph 14 of the Amendment) and execution thereof; (iii) reaffirms its
obligations to the Lender pursuant to the terms of its Subordination Agreement;
and (iv) acknowledges that the Lender may amend, restate, extend, renew or
otherwise modify the Loan Documents and any indebtedness or agreement of the
Borrower, or enter into any agreement or extend additional or other credit
accommodations, without notifying or obtaining the consent of the undersigned
and without impairing the obligations of the undersigned under its Subordination
Agreement.

                                     METRETEK TECHNOLOGIES, INC.

                                     By: /s/ A. Bradley Gabbard
                                         ---------------------------------
                                     Name:   A. Bradley Gabbard
                                     Its:    Executive Vice President

                                       5

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