Document:

Exhibit 10.8

 

SUBSCRIPTION AGREEMENT

 

	TO:	The Directors of Cleantech Acquisition
Corp. (the “Company”).

 

The undersigned hereby subscribes for 4,791,667 shares of common stock
(the “Shares”) of the Company. In consideration for the issue of the Shares, the undersigned hereby agrees and undertakes
to pay $16,667 to the Company.

 

We agree to take the Shares subject to the Certificate of Incorporation
and By-laws of the Company and we authorize you to enter the following name and address in the stockholders ledger of the Company:

 

	 	Name:	CleanTech Sponsor I LLC
	 	Address:	 

 

	CLEANTECH SPONSOR I LLC	 
	 	 	 
	Signed:	/s/ Eli Spiro	 
	Name:	Eli Spiro	 
	Title:	 	 
	 	 	 
	Dated:	February 16, 2021	
	 	 	 
	Accepted:	 	 
	 	 	 
	CLEANTECH ACQUISITION CORP.	 
	 	 	 
	Signed:	/s/ Eli Spiro	 
	Name:  	Eli Spiro	 
	Title:  	 	 
	 	 	 
	Dated:	February 16, 2021Exhibit
10.9

 

FORFEITURE
AGREEMENT

 

This
Forfeiture Agreement (this “Agreement”) is entered into as of June 23, 2021, by and between CleanTech Sponsor I LLC (the “Transferor”)
and CleanTech Acquisition Corp. (the “Transferee”).

 

RECITALS

 

WHEREAS, the Transferor desires to transfer 1,916,667
shares (the “Shares”) of common stock of the Transferee back to the Transferee.

 

NOW, THEREFORE, the parties hereto, for good and
valuable consideration which each party acknowledges the receipt of, hereby agree as follows:

 

		1.	Transfer of the Shares.

 

The Transferor hereby transfers to the Transferee
the Shares, and the Transferee hereby cancels the Shares.

 

		2.	Representations and Warranties of the Transferor.

 

The Transferor represents and warrants that it
has full legal capacity and authority to enter into the Agreement and to transfer the Shares to the Transferee hereunder, and is not bound
by any agreement, instrument or governmental order prohibiting such transfer. The Transferor also represents that it is transferring such
interests free and clear of all liens and encumbrances other than those created by the terms of the Transferee’s organizational
documents or imposed by applicable federal and state securities laws.

 

		3.	Binding Effect.

 

This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective legal representatives, successors and assigns.

 

		4.	Entire Agreement.

 

This Agreement constitutes the entire agreement
of the parties hereto.

 

		5.	Governing Law.

 

This Agreement shall be governed by the laws of
the State of New York without regard to its conflict of laws principles.

 

		6.	Modification.

 

This Agreement may not be amended or supplemented
at any time unless by a writing executed by the parties hereto.

 

		7.	Headings.

 

The headings in this Agreement are solely for convenience
or reference and shall not affect its interpretation.

 

		8.	Counterparts; Facsimile.

 

This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and
the same instrument. This Agreement or any counterpart may be executed via facsimile or other electronic transmission, and any such executed
facsimile or electronic copy shall be treated as an original.

 

[The balance of this page is intentionally left
page.]

 

     

    

    

 

IN WITNESS WHEREOF, the undersigned have executed
this Agreement as of the date first set forth above.

  

	 	Transferor:
	 	 
	 	CleanTech Sponsor I LLC
	 	 
	 	By:  	/s/
    Eli Spiro
	 	Name: 	Eli Spiro
	 	Title: 	Chief Executive Officer

  

	 	Transferee:
	 	 
	 	CleanTech Acquisition Corp.
	 	 
	 	By: 	/s/
    Eli Spiro
	 	Name: 	 Eli Spiro
	 	Title: 	Chief Executive OfficerExhibit 10.10

 

FORFEITURE
AGREEMENT

 

This
Forfeiture Agreement (this “Agreement”) is entered into as of June 23, 2021, by and between CleanTech Investments, LLC (the
“Transferor”) and CleanTech Acquisition Corp. (the “Transferee”).

 

RECITALS

 

WHEREAS, the Transferor desires to transfer 958,333
shares (the “Shares”) of common stock of the Transferee back to the Transferee.

 

NOW, THEREFORE, the parties hereto, for good and
valuable consideration which each party acknowledges the receipt of, hereby agree as follows:

 

	1.	Transfer of the Shares.

 

The Transferor hereby transfers to the Transferee
the Shares, and the Transferee hereby cancels the Shares.

 

	2.	Representations and Warranties of the Transferor.

 

The Transferor represents and warrants that it
has full legal capacity and authority to enter into the Agreement and to transfer the Shares to the Transferee hereunder, and is not bound
by any agreement, instrument or governmental order prohibiting such transfer. The Transferor also represents that it is transferring such
interests free and clear of all liens and encumbrances other than those created by the terms of the Transferee’s organizational
documents or imposed by applicable federal and state securities laws.

 

	3.	Binding Effect.

 

This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective legal representatives, successors and assigns.

 

	4.	Entire Agreement.

 

This Agreement constitutes the entire agreement
of the parties hereto.

 

	5.	Governing Law.

 

This Agreement shall be governed by the laws of
the State of New York without regard to its conflict of laws principles.

 

	6.	Modification.

 

This Agreement may not be amended or supplemented
at any time unless by a writing executed by the parties hereto.

 

		7.	Headings.

 

The headings in this Agreement are solely for convenience
or reference and shall not affect its interpretation.

 

		8.	Counterparts; Facsimile.

 

This Agreement may be executed in any number of
counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and
the same instrument. This Agreement or any counterpart may be executed via facsimile or other electronic transmission, and any such executed
facsimile or electronic copy shall be treated as an original.

 

[The balance of this page is intentionally left
page.]

 

    

     

    

 

IN WITNESS WHEREOF, the undersigned have executed
this Agreement as of the date first set forth above.

 

	 	Transferor:
	 	 
		Clean Tech
    Investments, LLC
	 	 
		By:	/s/
    Jonas Grossman_
	 	Name: 	 Jonas Grossman
	 	Title:	 Managing Member

 

	 	Transferee:
	 	 
	 	Clean Tech Acquisition Corp.
	 	 
	 	By:	 /s/
    Eli Spiro
	 	Name: 	 Eli Spiro
	 	Title:	 Chief Executive OfficerExhibit 10.11

 

THIS NOTE HAS NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”). THIS NOTE HAS BEEN ACQUIRED FOR INVESTMENT ONLY AND MAY NOT BE SOLD, TRANSFERRED
OR ASSIGNED IN THE ABSENCE OF REGISTRATION OF THE RESALE THEREOF UNDER THE SECURITIES ACT OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY
IN FORM, SCOPE AND SUBSTANCE TO THE COMPANY THAT SUCH REGISTRATION IS NOT REQUIRED.

PROMISSORY NOTE

 

	Principal Amount: $250,000	Dated as of March 1, 2021

 

CleanTech Acquisition Corp., a Delaware corporation
(the “Maker”), promises to pay to the order of CleanTech Investments, LLC or its registered assigns or successors in
interest (the “Payee”) the principal sum of Two Hundred Fifty Thousand dollars ($250,000) in lawful money of the United
States of America, on the terms and conditions described below. All payments on this Note shall be made by check or wire transfer of immediately
available funds or as otherwise determined by the Maker to such account as the Payee may from time to time designate by written notice
in accordance with the provisions of this Note.

 

		1.	Principal. The principal balance of this Promissory Note (this “Note”) shall be payable promptly after the
date on which the Maker consummates an initial public offering of its securities or the date on which the Company determines not to conduct
an initial public offering of its securities. The principal balance may be prepaid at any time.

 

		2.	Interest. No interest shall accrue on the unpaid principal balance of this Note.

 

		3.	Application of Payments. All payments shall be applied first to payment in full of any costs incurred in the collection of
any sum due under this Note, including (without limitation) reasonable attorney’s fees, then to the payment in full of any late
charges and finally to the reduction of the unpaid principal balance of this Note.

 

		4.	Events of Default. The following shall constitute an event of default (“Event of Default”):

 

		(a)	Failure to Make Required Payments. Failure by Maker to pay the principal of this Note within five (5) business days following
the date when due.

 

		(b)	Voluntary Liquidation, Etc. The commencement by Maker of a proceeding relating to its bankruptcy, insolvency, reorganization,
rehabilitation or other similar action, or the consent by it to the appointment of, or taking possession by, a receiver, liquidator, assignee,
trustee, custodian, sequestrator (or other similar official) for Maker or for any substantial part of its property, or the making by it
of any assignment for the benefit of creditors, or the failure of Maker generally to pay its debts as such debts become due, or the taking
of corporate action by Maker in furtherance of any of the foregoing.

 

    

    

    

 

		(c)	Involuntary Bankruptcy, Etc. The entry of a decree or order for relief by a court having jurisdiction in the premises in respect
of maker in an involuntary case under any applicable bankruptcy, insolvency or similar law, for the appointing of a receiver, liquidator,
assignee, custodian, trustee, sequestrator (or similar official) for Maker or for any substantial part of its property, or ordering the
winding-up or liquidation of the affairs of Maker, and the continuance of any such decree or order unstayed and in effect for a period
of 60 consecutive days.

 

		5.	Remedies.

 

		(a)	Upon the occurrence of an Event of Default specified in Section 4(a) hereof, Payee may, by written notice to Maker, declare this Note
to be due immediately and payable, whereupon the unpaid principal amount of this Note, and all other amounts payable thereunder, shall
become immediately due and payable without presentment, demand, protest or other notice of any kind, all of which are hereby expressly
waived, anything contained herein or in the documents evidencing the same to the contrary notwithstanding.

 

		(b)	Upon the occurrence of an Event of Default specified in Sections 4(b) and 4(c), the unpaid principal balance of this Note, and all
other sums payable with regard to this Note, shall automatically and immediately become due and payable, in all cases without any action
on the part of Payee.

 

		6.	Waivers. Maker and all endorsers and guarantors of, and sureties for, this Note waive presentment for payment, demand, notice
of dishonor, protest, and notice of protest with regard to the Note, all errors, defects and imperfections in any proceedings instituted
by Payee under the terms of this Note, and all benefits that might accrue to Maker by virtue of any present or future laws exempting any
property, real or personal, or any part of the proceeds arising from any sale of any such property, from attachment, levy or sale under
execution, or providing for any stay of execution, exemption from civil process, or extension of time for payment; and Maker agrees that
any real estate that may be levied upon pursuant to a judgment obtained by virtue hereof, on any writ of execution issued hereon, may
be sold upon any such writ in whole or in part in any order desired by Payee.

 

		7.	Unconditional Liability. Maker hereby waives all notices in connection with the delivery, acceptance, performance, default,
or enforcement of the payment of this Note, and agrees that its liability shall be unconditional, without regard to the liability of any
other party, and shall not be affected in any manner by any indulgence, extension of time, renewal, waiver or modification granted or
consented to by Payee, and consents to any and all extensions of time, renewals, waivers, or modifications that may be granted by Payee
with respect to the payment or other provisions of this Note, and agrees that additional makers, endorsers, guarantors, or sureties may
become parties hereto without notice to Maker or affecting Maker’s liability hereunder.

 

    2

    

    

 

		8.	Notices. Any notice called for hereunder shall be deemed properly given if (i) sent by certified mail, return receipt requested,
(ii) personally delivered, (iii) dispatched by any form of private or governmental express mail or delivery service providing receipted
delivery or (iv) sent by facsimile or (v) to the following addresses or to such other address as either party may designate by notice
in accordance with this Section:

 

If to Maker:

 

CleanTech Acquisition Corp.

 

Attn:

 

If to Payee:

 

CleanTech Investments, LLC]

 

Attn:

 

Notice shall be deemed given on the earlier of
(i) actual receipt by the receiving party, (ii) the date shown on a facsimile transmission confirmation, (iii) the date reflected on a
signed delivery receipt, or (iv) two (2) Business Days following tender of delivery or dispatch by express mail or delivery service.

 

		9.	Construction. THIS NOTE SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF NEW YORK, WITHOUT REGARD TO CONFLICT
OF LAW PROVISIONS THEREOF.

 

		10.	Jurisdiction. The courts of New York have exclusive jurisdiction to settle any dispute arising out of or in connection with
this agreement (including a dispute relating to any non-contractual obligations arising out of or in connection with this agreement) and
the parties submit to the exclusive jurisdiction of the courts of New York.

 

		11.	Severability. Any provision contained in this Note which is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof,
and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable such provision in any other
jurisdiction.

 

		12.	Trust Waiver. Notwithstanding anything herein to the contrary, the Payee hereby waives any and all right, title, interest or
claim of any kind (“Claim”) in or to any amounts contained in the trust account in which the proceeds of the initial
public offering (the “IPO”) conducted by the Maker and the proceeds of the sale of securities in a private placement
to occur prior to the effectiveness of the IPO, as described in greater detail in the registration statement and prospectus to be filed
with the Securities and Exchange Commission in connection with the IPO, will be placed, and hereby agrees not to seek recourse, reimbursement,
payment or satisfaction for any Claim from the trust account or any distribution therefrom for any reason whatsoever.

 

    3

    

    

 

		13.	Amendment; Waiver. Any amendment hereto or waiver of any provision hereof may be made with, and only with, the written consent
of the Maker and the Payee.

 

		14.	Assignment. No assignment or transfer of this Note or any rights or obligations hereunder may be made by any party hereto (by
operation of law or otherwise) without the prior written consent of the other party hereto and any attempted assignment without the required
consent shall be void.

 

		15.	Further Assurance. The Maker shall, at its own cost and expense, execute and do (or procure to be executed and done by any
other necessary party) all such deeds, documents, acts and things as the Payee may from time to time require as may be necessary to give
full effect to this Promissory Note.

 

IN WITNESS WHEREOF, Maker, intending to be legally bound hereby, has
caused this Note to be duly executed on the day and year first above written.

 

	 	CLEANTECH ACQUISITION CORP.
	 	 	 
	 	By:	 
	 	Name: 	Eli Spiro
	 	Title:	Chief Executive Officer

 

 

4

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00330-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00330-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00330-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00330-of-00352.parquet"}]]