MASTER REVOLVING NOTE

Variable Rate-Maturity Date-Obligatory Advances (Business and Commercial Loans
                                      Only)

   AMOUNT         NOTE DATE         MATURITY DATE    TAX IDENTIFICATION #

$750,000.00   December 15, 2006   January 01, 2006        90-0181035

On the Maturity Date, as stated above, for value received, the undersigned
promise(s) to pay to the order of Comerica Bank ("Bank"), at any office of the
Bank in the State of California, Seven Hundred Fifty Thousand and no/100 Dollars
(U.S.) (or that portion of it advanced by the Bank and not repaid as later
provided) with interest until maturity, whether by acceleration or otherwise, or
an Event of Default, as later defined, at a per annum rate equal to the Bank's
base rate from time to time in effect plus 0.500% per annum and after that at a
rate equal to the rate of interest otherwise prevalling under this Note plus 3%
per annum (but in no event in excess of the maximum rate permitted by law). The
Bank's "base rate" is that annual rate of interest so designated by the Bank and
which is changed by the Bank from time to time. Interst rate changes will be
effective for interest computation purposes as and when the Bank's base rate
changes. Interest shall be calculated on the basis of a 360-day year for the
actual number of days the principal is outstanding. Accrued interest on this
Note shall be payable on the 1st day of each MONTH commencing February 01, 2007,
until the Maturity Date when all amounts outstanding under this Note shall be
due and payable in full. If the frequency of interest payments is not otherwise
specified, accrued interest on this Note shall be payable monthly on the first
day of each month. If any payment of principal or interest under this Note shall
be payable on a day other than a day on which the Bank is open for business,
this payment shall be extended to the next succeeding business day and interest
shall be payable at the rate specified in this Note during this extension. A
late payment charge equal to 6% of each late payment may be charged on any
payment not received by the Bank within 10 calendar days after the payment due
date, but acceptance of payment of this charge shall not waive any Default under
this note.

The principal amount payable under this Note shall be the sum of all advances
made by the Bank to or at the request of the undersigned, less principal
payments actually received in cash by the Bank. The books and records of the
Bank shall be the best evidence of the principal amount and the unpaid interest
amount owing at any time under this Note and shall be conclusive absent manifest
error. No interest shall accrue under this Note until the date of the first
advance made by the Bank; after that interest on all advances shall accrue and
be computed on the principal balance outstanding from time to time under this
Note until the same is paid in full.

This Note and any other indebtedness and liablities of any kind of the
undersigned (or any of them) to the Bank, and any and all modifications,
renewals of extensions of it, whether joint or several, contingent or absolute,
now existing or later arising, and however evidenced (collectively
"Indebtedness") are secured by and the Bank is granted a security interest in
all items deposited in any account of any of the undersinged with the Bank and
by all proceeds of these items (cash or otherwise), all account balances of any
of the undersigned from time to time with the Bank, by all property of any of
the undersigned from time to time in the possession of the Bank and by any other
collateral, rights and properties described in each and every deed of trust,
mortgage, security agreement, pledge, assignment and other security or
collateral agreement which has been, or will at any time(s) later be, executed
by any (or all) of the undersigned to or for the benefit of the Bank
(collectively "Collateral"). Notwithstanding the above, (i) to the extent that
any portion of the Indebtedness is a consumer loan, that portion shall not be
secured by any deed of trust or mortgage on the other security interest in any
of the undersigned's principal dwelling or any of the undersigned's real
property which is not a purchase money security interest as to that portion,
unless expressly provided to the contrary in another place, or (ii) if the
undersigned (or any of them) has(have) given or give(s) Bank a deed of trust or
mortgage covering real property, that deed of trust or mortgage shall not secure
this NOte or any other indebtedness of the undersigned (or any of them), unless
expressly provided to the contrary in another place.

If the undersigned (or any of them) or any guarantor under a guaranty of all or
part of the Indebtedness ("guarantor")(i) fail(s) to pay any of the Indebtedness
when due, by maturity, accelearation or otherwise, or fail(s) to pay any
indebtedness owing on a demand basis upon demand; or (ii) fail(s) to comply with
any of the terms or provisions of any agreement between the undersigned (or any
of them) or any such guarantor and the Bank; or (iii) become(s) Insolvent or the
subject of a voluntary or involuntary proceeding in bankruptcy, or a
reorganization, arrangement or creditor composition proceeding, (if a business
entity) cease(s) doing business as a going concern, (if a natural person) die(s)
or become(s) incompetent, (if a partnership) dissolve(s) or any general partner
of it dies, becomes incompetent or becomes the subject of a bankruptcy
proceeding or (if a corporation of a limited liability company) is the subject
of a dissolution, merger or consolidation; or (a) if any warranty or
representation made by any of the undersigned or any guarantor in connection
with this Note or any of the indebtedness shall be discovered to be untrue or
incomplete; or (b) if there is any termination, notice of termination, or breach
of any guaranty, pledge, collateral assignment or subordination agreement
relating to all or any part of the Indebtednes; or (c) if there is any failure
by any of the undersigned or any guarantor to pay when due any of its
indebtedness (other than to the Bank) or in the observance or performance of any
term, covenant or condition in any document evidencing, securing or relating to
such indebtedness; or (d) if the Bank deems itself insecure believing that the
prospect of payment of this Note or any of the Indebtedness is impaired or shall
fear deterioration, removal or waste of any of the Collateral; or (e) if there
is filed or issued a levy or writ of attachment or garnishment or other like
judicial process upon the undersigned (or any of them) or any guarantor or any
of the Collateral, including without limit, any accounts of the undersigned (or
any of them) or any guarantor with the Bank, then the Bank, upon the occurrence
of any of these events (each a "Default"), may at its option and without prior
notice to the undersigned (or any of them), declare any or all of the
indebtedness to be immediately due and payable (nothwithstanding any provisions
contained in the evidence of it to the contrary), cease advancing money or
extending credit to or for the benefit of the undersigned under this Note or any
other agreement between the undersigned and Bank, terminate this Note as to any
future liability or obligation of Bank, but without affecting Bank's rights and
security interests in any Collateral and the Indebtedness of the undersigned to
Bank, sell or liquidate all or any portion of the Collateral, set off against
the Indebtedness any amounts owning by the Bank to the undersigned (or any of
them), charge interest at the default rate provided in the document evidencing
the relevant Indebtedness and exercise any one or more of the rights and
remedies granted to the Bank by any agreement with the undersigned (or any of
them) or given to it under applicable law. In addition, if this Note is secured
by a deed of trust or mortgage covering real property, then the trustor or
mortgagor shall not mortgage or pledge the mortgaged premises as security for
any other indebteness or obligations. This Note, together with all other
indebtedness secured by said deed of trust or mortgage, shall become due and
payable immediately, without notice, at the option of the Bank, (a) if said
trustor or mortgagor shall mortgage or pledge the mortgaged premises for any
other Indebtedness or obligations or shall convey, assign or transfer the
mortgaged premises by deed, installment sale contract instrument, or (b) if the
title to the mortgaged premises shall become vested in any other person or party
in any manner whatsoever, or (c) if there is any disposition (through one or
more transactions) of legal or beneficial title to a controlling interest of
said trustor or mortgagor. All payments under this Note shall be in immediately
available United States funds, without setoff or counterclaim.

If this Note is signed by two or more parties (whether by all as makers or by
one or more as an accommodation party or otherwise), the obligations and
undertakings under this Note shall be that of all and any two or more jointly
and also of each severally. This Note shall bind the undersigned, and the
undersigned's respective heirs, personal representatives, successors and
assigns.

The undersigned waive(s) presentment, demand, protest, notice of dishonor,
notice of demand or intent to demand, notice of acceleration or intent to
accelerate, and all other notices and agree(s) that no extension or indulgence
to the undersigned (or any of them) or release, substitution or nonenforcement
of any security, or release or substitution of any of the undersigned, any
guarantor or any other party, whether with or without notice, shall affect the
obligations of any of the undersigned. The undersigned waive(s) all defensee or
right to discharge available under Section 3-605 of the California Uniform
Commercial Code and waive(s) all other suretyship defensee or right to
discharge. The undersigned agree(s) that the Bank has the right to sell, assign,
or grant participations, or any interest, in any or all of the indebtedness, and
that, in connection with the right, but without limiting its ability to make
other disclosures to the full extent allowable, the Bank may disclose all
documents and information which the bank now or later has relating to the
undersigned or the Indebtedness. The undersigned agree(s) that the Bank may
provide information relating to the Note or to the undersigned to the Bank's
parent, affiliates, subsidiaries and service providers.

The undersigned agree(s) to reimburse the holder or owner of this Note for any
and all costs and expenses (including without limit, court costs, legal expenses
and reasonable attorney fees, whether inside or outside counsel is used, whether
or not suit is instituted and, if suit is instituted, whether at the trial court
level, appellate level, in a bankruptcy, probate or administrative proceeding or
otherwise) incurred in collecting or attempting to collect this Note or incurred
in any other matter or proceeding relating to this Note.

The undersigned acknowledge(s) and agree(s) that there are no contrary
agreements, oral or written, establishing a term of this Note and agree(s) that
the terms and conditions of this Note may not be amended, waived or modified
except in a writing signed by an officer of the Bank expressly stating that the
writing constitutes an amendment, waiver or modification of the terms of this
Note. As used in this Note, the word "undersigned" means, individually and
collectively, each maker, accommodation party, Indorser and other party signing
this Note in a similar capacity. If any provision of this Note is unenforceable
in whole or part for any reason, the remaining provisions shall continue to be
effective. THIS NOTE IS MADE IN THE STATE OF CALIFORNIA AND SHALL BE GOVERNED BY
AND CONSTRUED IN ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF CALIFORNIA,
WITHOUT REGARD TO CONFLICT OF LAWS PRINCIPLES.

The maximum interest rate shall not exceed the highest applicable usury ceiling.

THE UNDERSIGNED AND THE BANK ACKNOWLEDGE THAT THE RIGHT TO TRIAL BY JURY IS A
CONSTITUTIONAL ONE, BUT THAT IT MAY BE WAIVED UNDER CERTAIN CIRCUMSTANCES. TO
THE EXTENT PERMITTED BY LAW, EACH PARTY, AFTER CONSULTING (OR HAVING HAD THE
OPPORTUNITY TO CONSULT) WITH COUNSEL OF THEIR CHOICE, KNOWINGLY AND VOLUNTARILY,
AND FOR THEIR MUTUAL BENEFIT, WAIVES ANY RIGHT TO TRIAL BY JURY IN THE EVENT OF
LITIGATION REGARDING THE PERFORMANCE OR ENFORCEMENT OF, OR IN ANY WAY RELATED
TO, THIS NOTE OR THE INDEBTEDNESS.

The undersigned acknowledges that one or more Guaranties have been entered into
which guaranty a portion of all Indebtedness. Upon partial satisfaction of the
Indebtedness, the undersigned expressly waives any right to designate the
portion of the Indebtness that is satisfied by such payment.

See Addendum "A" attached hereto and made a part of this Note.

Akeena Solar, Inc.

By: /s/ Barry Cinnamon                  Its: President
    ---------------------------------        -----------------------------------
    SIGNATURE OF                             TITLE

By:                                     Its:
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    SIGNATURE OF                             TITLE

By:                                     Its:
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    SIGNATURE OF                             TITLE

By:                                     Its:
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    SIGNATURE OF                             TITLE

605 University Avenue        Los Gatos        CA            USA          95032
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STREET ADDRESS                    CITY        STATE      (COUNTRY)      ZIP CODE

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                 For Bank Use Only                     CCAR #
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Loan Officer Initials  Loan Group Name  Obligor(s) Name

RG /s/ [Illegible]     SBB-Coastal      Akeena Solar, Inc.
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Loan Officer ID. No.   Loan Group No.   Obligor #           Note #  Amount
48828                  95936                                         $750,000.00
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                      ADDENDUM "A" TO MASTER REVOLVING NOTE

     This Addendum "A" to Master Revolving Note (this "Addendum") is attached
to, and by this reference shall be a part of and is hereby incorporated by this
reference into that certain Master Revolving Note dated December 15, 2006 (the
"Note") executed by AKEENA SOLAR, INC. ("Borrower") in favor of COMERICA BANK
("Bank") in the original principal amount of Seven Hundred Fifty Thousand and
no/100 Dollars ($750,000.00) ("Note Amount"). Except as otherwise noted, the
terms not defined herein shall have the meaning set forth in the Note.

     Nothwithstanding anything to the contrary contained in the Note, Borrower
and Bank agree that the provisions set forth therein shall be amended as
follows:

A.   Letters of Credit

1.   Subject to availability under the Note and subject to the terms and
     conditions of the Note, and so long as no Default has occurred or is
     continuing, Bank may, at its sole discretion from time to time during the
     term of the Note, issue or cause to be issued letters of credit for the
     account of Borrower in the aggregate outstanding face amount not to exceed
     Two Hundred Fifty Thousand and no/100 Dollars ($250,000.00); provided,
     however, that the sum of the oustanding principal balance of all advances
     made under the Note plus the Letter of Credit Obligations shall not at any
     time exceed the Note Amount. All letters of credit shall be in form and
     substance acceptable to Bank in its sole discretion and shall be subject to
     the terms and conditions of Bank's standard form of letter of credit
     applications and agreement. Each letter of credit shall have an expiration
     date no later than the maturity date of the Note.

2.   In addition to any and all other rights and remedies available to Bank
     under or pursuant to the Note or any other documents, instruments or
     agreements contemplated hereby, Borrower acknowledges and agrees that (i)
     at any time following the occurrence and during the continuation of any
     Default, and/or (ii) termination of Bank's commitment or obligation to make
     loans or advances or otherwise extent credit to or in favor of Borrower
     hereunder, in the event that and to the extent that there are any Letter of
     Credit Obligations outstanding at such time, upon demand of Bank, Borrower
     shall deliver to Bank, or cause to be delivered to Bank, cash collateral in
     an amount not less than such Letter of Credit Obligations, which cash
     collateral shall be held and retained by Bank as cash collateral for the
     repayment of such Letter of Credit Obligations, together with any and all
     other Indebtedness of Borrower to Bank remaining unpaid, and Borrower
     pledges to Bank and grants to Bank a continuing first priority security
     interest in such cash collateral so delivered to Bank. Alternatively,
     Borrower shall cause to be delivered to Bank an irrevocable standby letter
     of credit issued in favor of Bank by a bank acceptable to Bank, in its sole
     discretion, in an amount not less than such Letter of Credit Obligations,
     and upon terms acceptable to Bank, in its sole discretion.

3.   Borrower shall pay any standard issuance and other fees that Bank notifies
     Borrower will be charged for issuing and processing letters of credit for
     Borrower. The obligation of Borrower to immediately reimburse Bank for
     drawings made under letters of credit shall be absolute, unconditional and
     irrevocable in accordance with the terms of this Note and such letters of
     credit. Anything contained in the foregoing to the contrary
     notwithstanding, funded indebtedness of Borrower to Bank under the letters
     of credit shall bear interest at the then applicable rate of interest under
     the Note. Borrower shall indemnify, defend, protect and hold Bank harmless
     from any loss, cost, expense, or liability, including, without limitation,
     reasonable attorneys' fees, whether in-house or outside counsel is used,
     arising out of or in connection with any letters of credit.

4.   If at any time for any reason, the amount of Indebtedness owned by Borrower
     to Bank is greater than the aggregate amount available under the terms and
     conditions of this Note, Borrower shall immediately pay to Bank, in cash,
     the amount of such excess.

5.   "Letter of Credit Obligations" shall mean the aggregate sum of the undrawn
     amount of any letters(s) of credit issued by Bank upon the application of
     and/or for the account of Borrower, plus any unpaid reimbursement
     obligations owing by Borrower to Bank in respect of any such letter(s) of
     credit.

AKEENA SOLAR, INC.                     COMERICA BANK

By: /s/ Barry Cinnamon                 By: /s/ Reed Geisreiter
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Title: President                           Reed Geisreiter
                                           First Vice President - Western Market

By:
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Title:
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