Document:

Form of Registration Rights Agreement

 Exhibit 10.5 
 [FORM OF REGISTRATION RIGHTS AGREEMENT] 
 REGISTRATION RIGHTS AGREEMENT 
 dated as of                     , 2007 
 among 
 NTR ACQUISITION CO. 
 and 
 THE PERSONS NAMED HEREIN 

 TABLE OF CONTENTS 
  

					
	SECTION 1.	  	DEFINITIONS	  	1
			
	1.1.	  	Defined Terms	  	1
			
	1.2.	  	General Interpretive Principles	  	4
			
	SECTION 2.	  	REGISTRATION RIGHTS	  	4
			
	2.1.	  	Registrations on Form S-3	  	4
			
	2.2.	  	Demand Registrations	  	5
			
	2.3.	  	Incidental Registrations (“Piggy-Back” Registrations)	  	8
			
	2.4.	  	Registration Procedures	  	10
			
	2.5.	  	Underwritten Offerings	  	13
			
	2.6.	  	No Inconsistent Agreements; Additional Rights	  	14
			
	2.7.	  	Obligation to Suspend Distribution	  	14
			
	2.8.	  	Registration Expenses	  	15
			
	2.9.	  	Indemnification	  	15
			
	2.10.	  	Rule 144	  	18
			
	SECTION 3.	  	MISCELLANEOUS	  	18
			
	3.1.	  	Term	  	18
			
	3.2.	  	Notices	  	18
			
	3.3.	  	Successors, Assigns and Transferees	  	19
			
	3.4.	  	Governing Law; Service of Process; Consent to Jurisdiction	  	19
			
	3.5.	  	Headings	  	20
			
	3.6.	  	Severability	  	20
			
	3.7.	  	Amendment; Waiver	  	20
			
	3.8.	  	Counterparts	  	20
			
	3.9.	  	Attorney-In-Fact	  	20

 REGISTRATION RIGHTS AGREEMENT 
 REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of
                        , 2007, by and among NTR ACQUISITION CO., a Delaware corporation (the “Company”) and the
Persons listed on Schedule I hereto (each, a “Founder”). 
 WHEREAS, the Founders collectively beneficially own 6,250,000
shares (the “Initial Founders’ Shares”) of the Company’s common stock, par value $0.001 per share (the “Common Stock”), 2,500,000 initial founders’ warrants, each to purchase one share of Common Stock
(the “Initial Founders’ Warrants”), and 3,350,000 additional founders’ warrants, each to purchase one share of Common Stock (the “Additional Founders’ Warrants,” and together with the Initial
Founders’ Shares, the Initial Founders’ Warrants, and the shares of Common Stock issuable upon exercise of the Initial Founders’ Warrants and the Additional Founders’ Warrants, the “Founders’ Securities”),
all of which were acquired by private placement and are currently held of record by certain of the Founders; 
 WHEREAS, the Founders may in
certain circumstances and subject to certain transfer and other restrictions transfer (or cause to be transferred) to Permitted Transferees (as defined below) some or all of the Founders’ Securities; 
 WHEREAS, the Founders and the Company desire to enter into this Agreement to provide the Founders with certain rights relating to the registration of the
Founders’ Securities, and to provide for any Permitted Transferees who receive Founders’ Securities from time to time with the ability to accede to this agreement; 
 NOW, THEREFORE, in consideration of the foregoing and the mutual promises, covenants and agreements of the parties hereto, and for other good and
valuable consideration the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
 SECTION 1. DEFINITIONS 
 1.1. Defined Terms. As used in this Agreement, the following terms shall have the
following meanings: 
 “Adverse Disclosure” means public disclosure of material non-public information, which disclosure, in
the good faith judgment of the chief executive officer or principal financial officer of the Company after consultation with counsel to the Company, (i) would be required to be made in any Registration Statement or prospectus in order for the
applicable Registration Statement or prospectus not to contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein (in the case of any prospectus and any preliminary prospectus, in light
of the circumstances under which they were made) not misleading, (ii) would not be required to be made at such time if the Registration Statement were not being filed and (iii) the Company has a bona fide business purpose for not
publicly making it. 

 “Agreement” has the meaning set forth in the preamble hereto. 
 “business day” means any day, except a Saturday, Sunday or legal holiday on which the banking institutions in the City of New York are
authorized or obligated by law or executive order to close. 
 “Common Stock” has the meaning set forth in the recitals.

 “Company” has the meaning set forth in the preamble and shall include the Company’s successors by merger,
acquisition, reorganization or otherwise. 
 “Demand Registration” has the meaning set forth in Section 2.2(a).

 “Exchange Act” means the Securities Exchange Act of 1934, as amended, and any successor thereto, and any rules and
regulations promulgated thereunder, all as the same shall be in effect from time to time. 
 “Founder” has the meaning set
forth in the preamble hereto. 
 “holder” or “holders” means any holder or holders of Registrable
Securities who is a party hereto or who otherwise agrees in writing to be bound by the provisions of this Agreement pursuant to Section 3.3. 
 “Incidental Registration” has the meaning set forth in Section 2.3(a). 
 “Initial Business
Combination” means the acquisition by the Company, through a merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination, of one ore more businesses or assets in the energy
industry. 
 “Investors” has the meaning set forth in the preamble hereto. 
 “Loss” has the meaning set forth in Section 2.9(a). 
 “NASD” means the National Association of Securities Dealers, Inc. 
 “Permitted
Transferees” has the meaning set forth in the Second Amended and Restated Warrant Agreement dated [·], 2007, between the Company and
American Stock Transfer & Trust Company. 
 “Person” shall be construed as broadly as possible and shall include an
individual, corporation, association, partnership (including a limited liability partnership or a limited liability limited partnership), limited liability company, estate, trust, joint venture, unincorporated organization or a government or any
department, agency or political subdivision thereof. 
 “prospectus” means the prospectus included in any Registration
Statement, all amendments and supplements to such prospectus and all material incorporated by reference in such prospectus. 
  

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 “Registrable Securities” means the Initial Founders’ Shares, the Initial
Founders’ Warrants, the Additional Founders’ Warrants, the shares of Common Stock issuable upon exercise of the Initial Founders’ Warrants and the shares of Common Stock issuable upon exercise of the Additional Founders’
Warrants, in each case after their respective Release Dates; provided, however, that any of the foregoing securities shall cease to be Registrable Securities to the extent that (i) a Registration Statement with respect to their
sale has been declared effective under the Securities Act and they have been sold, transferred, disposed of or exchanged pursuant to such Registration Statement, (ii) they have been otherwise transferred pursuant to Rule 144 under the
Securities Act (or any similar rule or regulation then in force), new certificates for them not bearing a legend restricting transfer under the Securities Act shall have been delivered by the Company and they may be publicly resold without volume or
method of sale restrictions without registration under the Securities Act or (iii) they have ceased to be outstanding. For purposes of this Agreement, the Initial Founders’ Shares, the shares of Common Stock issuable upon exercise of the
Initial Founders’ Warrants and the shares of Common Stock issuable upon exercise of the Additional Founders’ Warrants shall together constitute one “class” of Registrable Securities and the Initial Founders’ Warrants and the
Additional Founders’ Warrants shall together constitute another class of Registrable Securities, provided that no Registrable Securities shall be part of the relevant class until the Release Date for such Registrable Securities. A
“percentage” (or a “majority”) of the Registrable Securities or any class thereof (or, where applicable, of any other securities) shall be determined based on the total number of such securities outstanding at the relevant time.

 “registration” means a registration of the Company’s securities for sale to the public under a Registration
Statement. 
 “Registration Statement” means any registration statement (other than a registration statement on Form S-4 or
Form S-8) of the Company for a public offering of the Company’s securities filed with, or to be filed with, the SEC under the rules and regulations promulgated under the Securities Act, including the prospectus, amendments and supplements to
such registration statement, including post-effective amendments, and all exhibits and all material incorporated by reference in such registration statement. 
 “Release Date” means, with respect to the Initial Founders’ Shares, the date that is one year from the date the Company completes its Initial Business Combination, and with respect to the Initial
Founders’ Warrants, the Additional Founders’ Warrants, and the shares of Common Stock issuable on exercise of each of them, the date on which the relevant Warrants become exercisable by their terms. 
 “SEC” means the Securities and Exchange Commission. 
 “Securities Act” means the Securities Act of 1933, as amended, and any successor thereto, and any rules and regulations promulgated thereunder, all as the same shall be in effect from time to time.

 “Underwritten Offering” means a registration in which securities of the Company are sold to an underwriter or
underwriters on a firm commitment basis for reoffering to the public. 
  

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 1.2. General Interpretive Principles. Whenever used in this Agreement, except as otherwise
expressly provided or unless the context otherwise requires, any noun or pronoun shall be deemed to include the plural as well as the singular and to cover all genders. The name assigned to this Agreement and the section captions used herein are for
convenience of reference only and shall not be construed to affect the meaning, construction or effect hereof. Unless otherwise specified, the terms “hereof,” “herein,” “hereunder” and similar terms refer to this
Agreement as a whole (including the exhibits, schedules and disclosure statements hereto), and references herein to Sections refer to Sections of this Agreement. 
 SECTION 2. REGISTRATION RIGHTS 
 2.1. Registrations on Form S-3. 
 (a) Filing. The holders of Registrable Securities may at any time and from time to time on or after the applicable Release Date, request in writing
that the Company register the resale of any or all of such Registrable Securities on Form S-3 or a successor or other appropriate, similar short-form registration which may be available at such time (“Form S-3”); provided,
however, that (i) the Company shall not be obligated to effect such request through an Underwritten Offering and (ii) the Company shall not be obligated to effect such a request if the Company has within the preceding twelve
(12) months effected a registration on Form S-3. Upon receipt of such written request, the Company will promptly give written notice of the proposed registration to all other holders of Registrable Securities, and, as soon as practicable
thereafter, effect the registration of all or such portion of such holder’s or holders’ Registrable Securities as are specified in such request, together with all or such portion of the Registrable Securities of any other holder or holders
joining in such request as are specified in a written request given within fifteen (15) business days after receipt of such written notice from the Company; provided, however, that the Company shall not be obligated to effect any
such registration pursuant to this Section 2.1: (i) if Form S-3 is not available for such offering; or (ii) if the holders of the Registrable Securities, together with the holders of any other securities of the Company entitled to
inclusion in such registration, propose to sell Registrable Securities at an aggregate offering price to the public of less than $500,000. Registrations effected pursuant to this Section 2.1 shall not be counted as Demand Registrations effected
pursuant to Section 2.2. 
 (b) Suspension of Registration. If the filing, initial effectiveness or continued use of Form S-3 at
any time would require the Company to make an Adverse Disclosure or would require the inclusion in such Form S-3 of financial statements that are unavailable to the Company for reasons beyond the Company’s control, the Company may, upon giving
prompt written notice of such action to the holders, delay the filing or initial effectiveness of, or suspend use of, the Form S-3 for the shortest period of time determined in good faith by the Company to be necessary for such purpose. In the event
the Company exercises its rights under the preceding sentence, the holders agree to suspend, immediately upon their receipt of the notice referred to above, their use of the prospectus relating to the registration on such Form S-3 in connection with
any sale or offer to sell Registrable Securities and agree not to disclose to any other Person the fact that the Company has exercised such rights or any related facts. The Company shall immediately notify the holders upon the expiration of any
period during which it exercised its rights under this Section 2.1(b). 
  

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 2.2. Demand Registrations. 
 (a) Demand by Holders. (i) At any time and from time on or after the applicable Release Date, the holders of not less than a majority of any
class of the Registrable Securities may make a written request to the Company for registration of all or part of each such class of Registrable Securities held by those holders, provided that the estimated market value of the Registrable Securities
of all classes to be so registered thereunder is at least $500,000 in the aggregate. Any such requested registration shall be referred to as a “Demand Registration.” Each request for a Demand Registration shall specify the class(es)
and aggregate amount(s) of Registrable Securities to be registered and the intended methods of distribution thereof. 
 (ii) Within five
(5) business days following receipt of any request for a Demand Registration, the Company shall deliver written notice of such request to all other holders of Registrable Securities of the class or classes to be registered. Thereafter, the
Company shall include in such Demand Registration any additional Registrable Securities of each such class which the holder or holders thereof have requested in writing be included in such Demand Registration, provided that all such requests have
been received by the Company within ten (10) business days of the Company’s having sent the applicable notice to such holder or holders (each such holder, including the Registrable Securities in such Demand Registration, a
“Demanding Holder”). All such requests shall specify the class and aggregate amount of Registrable Securities to be registered and the intended method of distribution. The Company may include in such registration additional
securities of the class or classes of the Registrable Securities to be registered thereunder, including securities to be sold for the Company’s own account or for the account of Persons who are not holders of Registrable Securities. 

(iii) As promptly as practicable, and, in any event, within sixty (60) days following receipt of a request for a Demand Registration, the Company
shall file a Registration Statement relating to such Demand Registration and thereafter the Company shall use its reasonable best efforts to cause such Registration Statement to be declared effective under the Securities Act. 
 (b) Limitation on Demand Registrations. In no event shall the Company be required to effect more than two (2) Demand Registrations, only one
of which may be effected prior to the last of the Release Dates. In addition, the Company shall not be required to file a Registration Statement for a Demand Registration at any time during the 12-month period following the effective date of another
Registration Statement filed pursuant to this Section 2.2. 
 (c) Demand Withdrawal. A holder may withdraw its Registrable
Securities from a Demand Registration at any time. If all holders withdraw, or holders withdraw Registrable Securities from a Demand Registration in such amounts that the Registrable Securities of all classes that remain covered by the relevant
Registration Statement have an estimated market value of less than $500,000, the Company shall cease all efforts to secure registration and such registration shall be deemed a Demand Registration for purposes of Section 2.2(b) unless the
withdrawal is based on the reasonable determination of the Demanding Holders that there has been, since the date of such request, a material adverse change in the business or prospects of the Company or in general market conditions and the Demanding
Holders who requested such registration shall have paid or reimbursed the Company for all of the reasonable out-of-pocket fees and expenses incurred by the Company in connection with the withdrawn registration. 
  

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 (d) Effective Registration. The Company shall be deemed to have effected a Demand Registration if
the applicable Registration Statement is declared effective by the SEC and remains effective for not less than 180 days (or such shorter period as will terminate when all Registrable Securities covered by such Registration Statement have been sold
or withdrawn) and the Company has complied with all of its obligations under this Agreement with respect thereto; provided, however, that if, after such Registration Statement has been declared effective, the offering of Registrable
Securities pursuant to a Demand Registration is interfered with by any stop order or injunction of the SEC or any other governmental agency or court, the Registration Statement with respect to such Demand Registration will be deemed not to have been
declared effective, unless and until, (i) such stop order or injunction is removed, rescinded or otherwise terminated, and (ii) holders of a majority of the relevant class or classes of Registrable Securities thereafter elect to continue
the offering; provided, further, that the Company shall not be obligated to file a second Registration Statement until a Registration Statement that has been filed is counted as a Demand Registration or is terminated. 
 (e) Suspension of Registration. If the filing, initial effectiveness or continued use of a Registration Statement in respect of a Demand
Registration at any time would require the Company to make an Adverse Disclosure or would require the inclusion in such Registration Statement of financial statements that are unavailable to the Company for reasons beyond the Company’s control,
the Company may, upon giving prompt written notice of such action to the holders, delay the filing or initial effectiveness of, or suspend use of, such Registration Statement for the shortest possible period of time determined in good faith by the
Company to be necessary for such purpose. In the event the Company exercises its rights under the preceding sentence, the holders agree to suspend, immediately upon their receipt of the notice referred to above, their use of the prospectus relating
to the Demand Registration in connection with any sale or offer to sell Registrable Securities. The Company shall immediately notify the holders of the expiration of any period during which it exercised its rights under this Section 2.2(e).

 (f) Underwritten Offering. If the holders of not less than a majority of the Registrable Securities of any class that is included
in any offering pursuant to a Demand Registration so elect, the offering of all of the Registrable Securities of that class shall be in the form of an Underwritten Offering and the right of any holder to include Registrable Securities of that class
in the Demand Registration shall be conditioned upon such holder’s participation in the Underwritten Offering. The holders of a majority of the class of Registrable Securities included in such Underwritten Offering shall, in consultation with
the Company, have the right to select the managing underwriter or underwriters for the offering, subject to the right of the Company should it so choose to select one co-managing underwriter reasonably acceptable to such holders. All holders
proposing to distribute their Registrable Securities through such an underwriting shall enter into an underwriting agreement in customary form with the underwriter(s) selected for such underwriting. 
 (g) Reduction of Offering. If the managing underwriter or underwriters of a proposed Underwritten Offering of a class of Registrable Securities
included in a Demand Registration, inform the holders of such Registrable Securities and the Company in writing that, 

  

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in its or their opinion, the number of securities of such class requested to be included in such Demand Registration, including securities of the Company for
its own account or for the account of other Persons who are not holders of Registrable Securities that the Company desires to sell and any securities as to which registration has been requested pursuant to written piggy-back registration rights (as
described in Section 2.3 below), exceeds the maximum dollar amount or maximum number of securities, as applicable, that can be sold in such offering without being likely to have a significant adverse effect on the price, timing or distribution
of the class of securities offered or the market for the class of securities offered (such maximum dollar amount or maximum number of securities, as applicable, the “Maximum Number of Securities”), then the Company shall include in
such registration: 
 (i) first, Registrable Securities as to which Demand Registration has been requested by the Demanding Holders, in an
amount up to but not exceeding the Maximum Number of Securities (allocated pro rata among the holders who have requested participation in the Demand Registration, based, for each such holder, on the percentage derived by dividing (x) the
number of Registrable Securities of such class which such holder has requested to include in such Demand Registration by (y) the aggregate number of Registrable Securities of such class which all such holders have requested to include);

 (ii) second, to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (i), securities that the
Company desires to sell that can be sold without exceeding the Maximum Number of Securities; 
 (iii) third, to the extent that the Maximum
Number of Securities has not been reached under the foregoing clauses (i) and (ii), securities for the account of other Persons that the Company is obligated to register pursuant to written contractual arrangements with such Persons and that
can be sold without exceeding the Maximum Number of Securities; and 
 (iv) fourth, to the extent that the Maximum Number of Securities have
not been reached under the foregoing clauses (i), (ii), and (iii), securities that other security holders of the Company desire to sell that can be sold without exceeding the Maximum Number of Securities. 
 To the extent that any Registrable Securities requested to be registered are excluded pursuant to the foregoing provisions, the holders shall have the
right to one additional Demand Registration under this Section 2.2. 
 (h) Registration Statement Form. Registrations under this
Section 2.2 shall be on such appropriate registration form of the SEC (i) as shall be selected by the Company and as shall be reasonably acceptable to the holders of a majority of each class of Registrable Securities requesting
participation in the Demand Registration and (ii) as shall permit the disposition of the Registrable Securities in accordance with the intended method or methods of disposition specified in the applicable holders’ requests for such
registration. Notwithstanding the 

  

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foregoing, if, pursuant to a Demand Registration, (x) the Company proposes to effect registration by filing a Registration Statement on Form S-3,
(y) such registration is in connection with an Underwritten Offering and (z) the managing underwriter or underwriters shall advise the Company in writing that, in its or their opinion, the use of another form of registration statement (or
the inclusion, rather than the incorporation by reference, of information in the prospectus related to a Registration Statement on Form S-3) is of material importance to the success of such proposed offering, then such registration shall be effected
on such other form (or such information shall be so included in such prospectus). 
 2.3. Incidental Registrations (“Piggy-Back”
Registrations). 
 (a) Participation. (i) If at any time on or after the first Release Date, the Company proposes to file a
Registration Statement with respect to any offering of its securities for its own account or for the account of any holders of its securities (or by the Company and by security holders of the Company, including, without limitation, pursuant to
Section 2.2 hereof), other than (A) a registration of securities relating solely to an offering and sale to employees or directors of the Company pursuant to any employee stock plan or other employee benefit plan arrangement, (B) a
registration on Form S-4 or S-8 or any successor form to such forms, (C) an exchange offer or offering of securities solely to the Company’s existing shareholders, (D) an offering of debt that is convertible into equity securities,
(E) a dividend reinvestment plan, or (F) solely in connection with a merger, consolidation or non-capital raising bona fide business transaction, then, as soon as practicable (but in no event less than ten (10) business days
prior to the proposed date of filing such Registration Statement), the Company shall give written notice of such proposed filing to all holders of Registrable Securities, which notice shall describe the amount and class of securities to be included
in such offering, the intended method(s) of distribution, and the name of the proposed managing underwriter or underwriters, if any, of the offering, and such notice shall offer the holders of such Registrable Securities the opportunity to register
such number of Registrable Securities as each such holder may request in writing (an “Incidental Registration”). Subject to Section 2.3(b), the Company shall include in such Registration Statement all such Registrable
Securities requested to be included therein within five (5) business days after the receipt by such holder of any such notice, on the same terms and conditions as any similar securities of the Company. If at any time after giving written notice
of its intention to register any securities and prior to the effective date of the Registration Statement filed in connection with such registration, the Company shall determine for any reason not to register or to delay registration of such
securities, the Company may, at its election, give written notice of such determination to each holder of Registrable Securities and, (x) in the case of a determination not to register, shall be relieved of its obligation to register any
Registrable Securities in connection with such registration, and (y) in the case of a determination to delay registering, shall be permitted to delay registering any Registrable Securities for the same period as the delay in registering such
other securities. 
 (ii) If the offering pursuant to an Incidental Registration is to be an Underwritten Offering, then each holder making a
request for its Registrable Securities to be included therein must, and the Company shall use its best efforts to make such arrangements with the underwriters so that each such holder may, participate in such Underwritten Offering on the same terms
and conditions as the Company and other Persons selling securities in such Underwritten Offering. If the offering pursuant to such registration is to be on any other basis, then each holder making a request for an Incidental Registration pursuant to
this Section 2.3(a) must participate in such offering on such basis. 
  

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 (iii) Each holder of Registrable Securities shall be permitted to withdraw all or part of such
holder’s Registrable Securities from an Incidental Registration at any time; 
 (b) Reduction of Incidental Registration. If the
managing underwriter or underwriters of any proposed Underwritten Offering of a class of securities included in an Incidental Registration (or in the case of an Incidental Registration not being underwritten, the Company) informs the holders of
Registrable Securities of any class sought to be included in such registration in writing that, in its or their opinion, the total amount or kind of securities which such holders and any other Persons intend to include in such offering exceeds the
number which can be sold in such offering without being likely to have a significant adverse effect on the price, timing or distribution of the class or classes of the securities offered or the market for the class or classes of securities offered
or the Company’s common stock, then the securities of each class to be included in such registration shall be allocated as follows: 
 (i) if the registration is undertaken for the Company’s account: (x) first, the securities that the Company desires to sell that can be sold without exceeding the Maximum Number of Securities and (y) second, to the extent
that the Maximum Number of Securities has not been reached under the foregoing clause (x), securities, if any, including the Registrable Securities, as to which registration has been requested pursuant to written contractual incidental registration
rights of security holders (including this Agreement) that can be sold without exceeding the Maximum Number of Securities (pro rata in accordance with the number of shares or other securities which each such Person has actually requested to
be included in such registration); 
 (ii) if the registration is a demand registration undertaken by Persons with demand rights pursuant to
a written contractual arrangement other than this Agreement, (w) first, securities for the account of the demanding Persons that can be sold without exceeding the Maximum Number of Securities, (x) second, to the extent that the Maximum
Number of Securities has not been reached under the foregoing clause (w), securities that the Company desires to sell and that can be sold without exceeding the Maximum Number of Securities, (y) third, to the extent that the Maximum Number of
Securities has not been reached under the foregoing clauses (w) and (x), securities (including the Registrable Securities) as to which registration has been requested pursuant to a written contractual incidental registration rights of security
holders (including this Agreement) that can be sold without exceeding the Maximum Number of Securities (pro rata in accordance with the number of shares or other securities which each such Person has actually requested to be included in such
registration), and (z) fourth, to the extent that the Maximum Number of Securities have not been reached under the foregoing clauses (w), (x) and (y), securities that other security holders desire to sell without exceeding the Maximum
Number of Securities. 
  

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 2.4. Registration Procedures 
 (a) In connection with the Company’s registration obligations in this Agreement, the Company will, subject to the limitations set forth herein, use
its reasonable best efforts to effect any such registration so as to permit the sale of the applicable Registrable Securities in accordance with the intended method or methods of distribution thereof as expeditiously as reasonably practicable, and
in connection therewith the Company will: 
 (i) before filing a Registration Statement or prospectus, or any amendments or supplements
thereto and in connection therewith, furnish to the underwriter or underwriters, if any, and to the holders of the Registrable Securities included in such registration, and such holders’ legal counsel, copies of all documents prepared to be
filed, which documents will be subject to the review of such underwriters and such holders and their counsel and, except in the case of a registration under Section 2.3, will not file any Registration Statement or prospectus or amendments or
supplements thereto to which a majority of such holders or the underwriter or underwriters, if any, shall reasonably object; 
 (ii) prepare
and file with the SEC such amendments or supplements to the applicable Registration Statement or prospectus as may be (A) reasonably requested by any participating holder (to the extent such request relates to information relating to such
holder), (B) necessary to keep such registration effective for the period of time required by this Agreement or (C) reasonably requested by the holders of a majority of any class of the participating Registrable Securities; 
 (iii) notify the selling holders of Registrable Securities and the managing underwriter or underwriters, if any, and (if requested) confirm such advice
in writing, as soon as reasonably practicable after notice thereof is received by the Company (A) when the applicable Registration Statement or any amendment thereto has been filed or becomes effective and when the applicable prospectus or any
amendment or supplement thereto has been filed, (B) of any written comments by the SEC or any request by the SEC or any other federal or state governmental authority for amendments or supplements to such Registration Statement or prospectus or
for additional information, (C) of the issuance by the SEC or any other governmental agency or court of any stop order suspending the effectiveness of such Registration Statement or any order preventing or suspending the use of any preliminary
or final prospectus or the initiation or threat of any proceedings for such purposes and (D) of the receipt by the Company of any notification with respect to the suspension of the qualification of the Registrable Securities for offering or
sale in any jurisdiction or the initiation or threat of any proceeding for such purpose; 
 (iv) promptly notify each selling holder of
Registrable Securities and the managing underwriter or underwriters, if any, when the Company becomes aware of the happening of any event as a result of which the applicable Registration Statement or prospectus (as then in effect) contains any
untrue statement of a material fact or omits to state a material fact necessary to make the statements therein (in the case of the prospectus and any preliminary 

  

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prospectus, in light of the circumstances under which they were made) not misleading or, if for any other reason it shall be necessary to amend or supplement
such Registration Statement or prospectus in order to comply with the Securities Act and, in either case as promptly as reasonably practicable thereafter, prepare and file with the SEC an amendment or supplement to such Registration Statement or
prospectus which will correct such statement or omission or effect such compliance; 
 (v) make every reasonable effort to prevent or obtain
at the earliest possible moment the withdrawal of any stop order with respect to the applicable Registration Statement or other order suspending the use of any preliminary or final prospectus; 
 (vi) promptly incorporate in a prospectus supplement or post-effective amendment to the applicable Registration Statement such information as the
managing underwriter or underwriters, if any, or the holders of a majority of the Registrable Securities of the class being sold agree should be included therein relating to the plan of distribution with respect to such Registrable Securities; and
make all required filings of such prospectus supplement or post-effective amendment as soon as reasonably practicable after being notified of the matters to be incorporated in such prospectus supplement or post-effective amendment; 
 (vii) furnish to each selling holder of Registrable Securities and each managing underwriter, if any, without charge, as many conformed copies as such
holder or managing underwriter may reasonably request of the applicable Registration Statement; 
 (viii) deliver to each selling holder of
Registrable Securities and each managing underwriter, if any, without charge, as many copies of the applicable prospectus (including each preliminary prospectus) as such holder or managing underwriter may reasonably request (its being understood
that the Company consents to the use of the prospectus by each of the selling holders of Registrable Securities and the underwriter or underwriters, if any, in connection with the offering and sale of the Registrable Securities covered by the
prospectus) and such other documents as such selling holder or managing underwriter may reasonably request in order to facilitate the disposition of the Registrable Securities by such holder or underwriter; 
 (ix) on or prior to the date on which the applicable Registration Statement is declared effective, use its reasonable best efforts to register or qualify
such Registrable Securities for offer and sale under the securities or “Blue Sky” laws of each state and other jurisdiction of the United States, as any such selling holder or underwriter, if any, or their respective counsel reasonably
requests in writing, and do any and all other acts or things reasonably necessary or advisable to keep such registration or qualification in effect so as to permit the commencement and continuance of sales and dealings in such jurisdictions for as
long as may be necessary to complete the distribution of the Registrable Securities covered by the Registration Statement; provided, however, that the Company will not be required to qualify generally to do business in any jurisdiction
where it is not then so qualified or to take any action which would subject it to taxation or general service of process in any such jurisdiction where it is not then so subject; 
 (x) cooperate with the selling holders of Registrable Securities and the managing underwriter, underwriters or agent, if any, to facilitate the timely
preparation and delivery of certificates representing Registrable Securities to be sold and not bearing any restrictive legends; 
  

 11 

 (xi) not later than the effective date of the applicable Registration Statement, provide a CUSIP number
for all Registrable Securities and provide the applicable transfer agent with printed certificates for the Registrable Securities which certificates shall be in a form eligible for deposit with The Depository Trust Company; 
 (xii) obtain for delivery to the holders of each class of Registrable Securities being registered and to the underwriter or underwriters, if any, an
opinion or opinions from counsel for the Company dated the effective date of the Registration Statement or, in the event of an Underwritten Offering, the date of the closing under the underwriting agreement, in customary form, scope and substance,
at a minimum to the effect that the Registration Statement has been declared effective and that no stop order is in effect, which counsel and opinions shall be reasonably satisfactory to a majority of the holders of each such class and underwriter
or underwriters, if any, and their respective counsel; 
 (xiii) in the case of an Underwritten Offering, obtain for delivery to the Company
and the underwriter or underwriters, if any, with copies to the holders of Registrable Securities included in such registration, such cold comfort letter(s) from the Company’s independent registered public accounting firm in customary form and
covering such matters of the type customarily covered by cold comfort letters as the managing underwriter or underwriters reasonably request; 
 (xiv) cooperate with each seller of Registrable Securities and each underwriter or agent, if any, participating in the disposition of such Registrable Securities and their respective counsel in connection with any filings required to be
made with the NASD; 
 (xv) use its reasonable best efforts to comply with all applicable rules and regulations of the SEC and make generally
available to its security holders, as soon as reasonably practicable (but not more than 15 months) after the effective date of the applicable Registration Statement, an earnings statement satisfying the provisions of Section 11(a) of the
Securities Act and the rules and regulations promulgated thereunder; 
 (xvi) provide and cause to be maintained a transfer agent and
registrar for all Registrable Securities covered by the applicable Registration Statement from and after a date not later than the effective date of such Registration Statement; 
 (xvii) cause all Registrable Securities of a class covered by the applicable Registration Statement to be listed on each securities exchange on which any
of the Company’s securities of such class are then listed or quoted and on each inter-dealer quotation system on which any of the Company’s securities of such class are then quoted; 
 (xviii) make available upon reasonable notice at reasonable times and for reasonable periods for inspection by a representative appointed by the holders
of a majority of the Registrable Securities of each class covered by the applicable Registration Statement, by any managing underwriter or underwriters participating in any disposition to be effected pursuant to such Registration Statement and by
any attorney, accountant or other agent retained by such 

  

 12 

 
sellers or any such managing underwriter, all pertinent financial and other records, pertinent corporate documents and properties of the Company, and cause
all of the Company’s officers, directors and employees and the independent public accountants who have certified its financial statements to make themselves available to discuss the business of the Company and to supply all information
reasonably requested by any such seller, underwriter, attorney, accountant or agent in connection with such Registration Statement as shall be necessary to enable them to exercise their due diligence responsibility (subject to the entry by each
party referred to in this clause (xviii) into customary confidentiality agreements in a form reasonably acceptable to the Company); and 
 (xix) in the case of an Underwritten Offering, cause senior executive officers of the Company to participate in customary “road show” presentations that may be reasonably requested by the managing underwriter in any such
Underwritten Offering and otherwise to facilitate, cooperate with, and participate in each proposed offering contemplated herein and customary selling efforts related thereto. 
 (b) The Company may require each selling holder of Registrable Securities as to which any registration is being effected to furnish to the Company such
information regarding the distribution of such Securities and such other information relating to such holder and its ownership of the applicable Registrable Securities as the Company may from time to time reasonably request. Each holder of
Registrable Securities agrees to furnish such information to the Company and to cooperate with the Company as necessary to enable the Company to comply with the provisions of this Agreement. The Company shall have the right to exclude any holder
that does not comply with the preceding sentence from the applicable registration. 
 2.5. Underwritten Offerings. 
 (a) Underwriting Agreements. If requested by the underwriters for any Underwritten Offering requested by holders pursuant to Sections 2.1 or 2.2,
the Company and the holders of Registrable Securities to be included therein shall enter into an underwriting agreement with such underwriters, such agreement to be reasonably satisfactory in substance and form to the Company, the holders of a
majority of each class of the Registrable Securities to be included in such Underwritten Offering and the underwriters, and to contain such terms and conditions as are generally prevailing in agreements of that type, including, without limitation,
indemnities no less favorable to the recipient thereof than those provided in Section 2.9. The holders of any Registrable Securities to be included in any Underwritten Offering pursuant to Section 2.3 shall enter into such an underwriting
agreement at the request of the Company. All of the representations and warranties and the other agreements by and on the part of the Company to and for the benefit of the underwriters included in any such underwriting agreement shall also be made
to and for the benefit of such holders, and any or all of the conditions precedent to the obligations of the underwriters under such underwriting agreement shall be conditions precedent to the obligations of such holders. No holder shall be required
in any such underwriting agreement to make any representations or warranties to or agreements with the Company or the underwriters other than representations, warranties or agreements regarding such holder, such holder’s Registrable Securities,
such holder’s intended method of distribution and any other representations required by law. 
  

 13 

 (b) Price and Underwriting Discounts. In the case of an Underwritten Offering requested by holders
pursuant to Sections 2.1 or 2.2, the price, underwriting discount and other financial terms of the related underwriting agreement for each class of Registrable Securities shall be determined by the holders of a majority of such class of Registrable
Securities. In the case of any Underwritten Offering pursuant to Section 2.3, such price, discount and other terms shall be determined by the Company, subject to the right of the holders to withdraw their request to participate in the
registration pursuant to Section 2.3(a)(iii) after being advised of such price, discount and other terms. 
 (c) Participation in
Underwritten Offerings. No Person may participate in an Underwritten Offering unless such Person (i) agrees to sell such Person’s securities on the basis provided in the underwriting arrangements approved by the Persons entitled to
approve such arrangements and (ii) completes and executes all questionnaires, powers of attorney, indemnities, underwriting agreements and other documents required under the terms of such underwriting arrangements. 
 2.6. No Inconsistent Agreements; Additional Rights. The Company will not enter into, and is not currently a party to, any agreement that is
inconsistent with the rights granted to the holders of Registrable Securities by this Agreement. 
 2.7. Obligation to Suspend
Distribution. 
 (a) Each holder of Registrable Securities agrees by acquisition of such Registrable Securities that, upon receipt of any
notice from the Company of the happening of any events of the kind described in Sections 2.4(a)(iii)(C), 2.4(a)(iii)(D)(in any applicable state) or 2.4(a)(iv), such holder will discontinue disposition of its Registrable Securities pursuant to the
Registration Statement, in the case of Section 2.4(a)(iv), until the holder receives copies of the supplemented or amended prospectus contemplated by Section 2.4(a)(iv), or in any case until the holder is advised in writing by the Company
that the use of the prospectus may be resumed, and receives copies of any additional or supplemental filings that are incorporated by reference in the prospectus and, if so directed by the Company, the holder will deliver to the Company (at the
Company’s expense) all copies, other than permanent file copies then in such holder’s possession, of the prospectus covering such Registrable Securities that are current at the time of the receipt of such notice. In the event that the
Company shall give any such notice in respect of a Demand Registration, the period during which the applicable Registration Statement is required to be maintained effective shall be extended by the number of days during the period from and including
the date of the giving of such notice to and including the date when each seller of Registrable Securities covered by such Registration Statement either receives the copies of the supplemented or amended prospectus contemplated by
Section 2.4(a)(iv) or is advised in writing by the Company that the use of the prospectus may be resumed. 
 (b) In the case of a resale
registration on Form S-3 pursuant to Section 2.1, upon any suspension by the Company, pursuant to a written insider trading compliance program adopted by the Company’s board of directors, of the ability of all “insiders” covered
by such program to transact in the Company’s securities because of the existence of material non-public information, each holder of Registrable Securities included in any registration shall immediately discontinue disposition of such
Registrable Securities pursuant to the Registration Statement covering such Registrable Securities until the restriction on the ability of “insiders” to transact in the Company’s securities is removed. 
  

 14 

 2.8. Registration Expenses. (a) The Company shall pay all of the expenses set forth in this
paragraph (a) in connection with a registration under this Agreement of Registrable Securities. Such expenses are (i) all registration and filing fees, and any other fees and expenses associated with filings required to be made with the
SEC or the NASD, (ii) all fees and expenses of compliance with state securities or “Blue Sky” laws, (iii) all printing, duplicating, word processing, messenger, telephone, facsimile and delivery expenses (including expenses of
printing certificates for the Registrable Securities in a form eligible for deposit with The Depository Trust Company and of printing prospectuses), (iv) all fees and disbursements of counsel for the Company and of all independent certified
public accountants of the Company, (v) Securities Act liability insurance or similar insurance if the Company so desires and (vi) all fees and expenses incurred in connection with the listing of the Registrable Securities on any securities
exchange or the quotation of the Registrable Securities on any inter-dealer quotation system. In addition, in all cases the Company shall pay its internal expenses (including, without limitation, all salaries and expenses of its officers and
employees performing legal or accounting duties), the expense of any audit and the fees and expenses of any other Persons retained by the Company, including any special experts. In addition, the Company shall pay all reasonable fees and
disbursements not to exceed $[•] of one law firm or other counsel selected by the holders of a majority of the Registrable Securities being registered. 
 (b) The Company shall not be required to pay any other costs or expenses in the course of the transactions contemplated hereby, including underwriting discounts and commissions and transfer taxes attributable to the
sale of Registrable Securities and the fees and expenses of any counsel to any holder of Registrable Securities other than as provided pursuant to the last sentence of the preceding paragraph (a), or of counsel to the underwriters. 
 2.9. Indemnification. 
 (a)
Indemnification by the Company. The Company agrees to indemnify and hold harmless, to the full extent permitted by law, each holder of Registrable Securities and their respective officers, directors, employees, advisors and agents and each
Person who controls (within the meaning of the Securities Act or the Exchange Act) such Persons from and against any and all losses, claims, damages, liabilities (or actions or proceedings in respect thereof, whether or not such indemnified party is
a party thereto) and expenses (including reasonable costs of investigation and legal expenses), joint or several (each, a “Loss” and collectively “Losses”), arising out of or based upon (i) any untrue or
alleged untrue statement of a material fact contained in any Registration Statement under which such Registrable Securities were registered under the Securities Act (including any final, preliminary or summary prospectus contained therein or any
amendment thereof or supplement thereto or any documents incorporated by reference therein) or (ii) any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein (in
the case of a prospectus or preliminary prospectus, in light of the circumstances under which they were made) not misleading; provided, however, that the Company shall not be liable to any indemnified party in any such case to the
extent that any such Loss arises out of or is based upon an untrue statement or alleged untrue statement or omission or alleged omission made in any 

  

 15 

 
such Registration Statement in reliance upon and in conformity with written information furnished to the Company by such holder expressly for use in the
preparation thereof; and provided, further, that the Company will not be liable to any indemnified party in any case to the extent that any such Loss arises out of or is based upon any untrue statement or alleged untrue statement or
omission or alleged omission made in any final, preliminary or summary prospectus if such untrue statement or alleged untrue statement or omission or alleged omission is corrected in an amendment or supplement to such prospectus which has been made
available to the holders and the relevant holder of Registrable Securities fails to deliver such prospectus as so amended or supplemented, if such delivery is required under applicable law or the applicable rules of any securities exchange, prior to
or concurrently with the sales of the Registrable Securities to the Person asserting such loss, claim, damage, liability or expense. This indemnity shall be in addition to any liability the Company may otherwise have. 
 (b) Indemnification by the Holders. Each selling holder of Registrable Securities agrees (severally and not jointly) to indemnify and hold
harmless, to the full extent permitted by law, the Company, its directors and officers and each Person who controls the Company (within the meaning of the Securities Act and the Exchange Act) from and against any Losses resulting from any untrue
statement of a material fact or any omission of a material fact required to be stated in the Registration Statement under which such Registrable Securities were registered under the Securities Act (including any final, preliminary or summary
prospectus contained therein or any amendment thereof or supplement thereto or any documents incorporated by reference therein), or necessary to make the statements therein (in the case of a prospectus or preliminary prospectus, in light of the
circumstances under which they were made) not misleading, to the extent, but only to the extent, that such untrue statement or omission had been contained in any information furnished in writing by such selling holder to the Company specifically for
inclusion in such Registration Statement and was not corrected in a subsequent writing prior to or concurrently with the sale of the Registrable Securities to the Person asserting such loss, claim, damage, liability or expense. This indemnity shall
be in addition to any liability such holder may otherwise have. Such indemnity shall remain in full force and effect regardless of any investigation made by or on behalf of the Company or any indemnified party. In no event shall the liability of any
selling holder of Registrable Securities hereunder be greater in amount than the dollar amount of the proceeds received by such holder under the sale of the Registrable Securities giving rise to such indemnification obligation. 
 (c) Conduct of Indemnification Proceedings. Any Person entitled to indemnification hereunder will (i) give prompt written notice to the
indemnifying party of any claim with respect to which it seeks indemnification (provided, however, that any delay or failure to so notify the indemnifying party shall relieve the indemnifying party of its obligations hereunder only to
the extent, if at all, that it is actually and materially prejudiced by reason of such delay or failure) and (ii) permit such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to the indemnified party;
provided, however, that any Person entitled to indemnification hereunder shall have the right to select and employ separate counsel and to participate in the defense of such claim, but the fees and expenses of such counsel shall be at
the expense of such Person unless (A) the indemnifying party has agreed in writing to pay such fees or expenses, (B) the indemnifying party shall have failed to assume the defense of such claim within a reasonable time after having
received notice of such claim from the Person entitled to indemnification hereunder and to employ counsel reasonably satisfactory to such 

  

 16 

 
Person, (C) in the reasonable judgment of any such Person, based upon advice of its counsel, a conflict of interest exists between such Person and the
indemnifying party with respect to such claims or (D) based on advice of counsel, the indemnified party has reasonably concluded that there may be legal defenses available to it or other indemnified parties that are different from or in
addition to those available to the indemnifying party such that the indemnifying party’s assumption of defense of the indemnified party would be likely to adversely affect the defense of the indemnified party (in which case, if the Person
notifies the indemnifying party in writing that such Person elects to employ separate counsel at the expense of the indemnifying party, the indemnifying party shall not have the right to assume the defense of such claim on behalf of such Person). If
such defense is not assumed by the indemnifying party, the indemnifying party will not be subject to any liability for any settlement made without its consent, but such consent may not be unreasonably withheld; provided, however, that
an indemnifying party shall not be required to consent to any settlement involving the imposition of equitable remedies or involving the imposition of any material obligations on such indemnifying party other than financial obligations for which
such indemnified party will be indemnified hereunder. If the indemnifying party assumes the defense, the indemnifying party shall have the right to settle such action without the consent of the indemnified party; provided, however,
that the indemnifying party shall be required to obtain such consent (which consent shall not be unreasonably withheld) if the settlement includes any admission of wrongdoing on the part of the indemnified party or any restriction on the indemnified
party or its officers or directors. No indemnifying party shall consent to entry of any judgment or enter into any settlement which does not include as an unconditional term thereof the giving by the claimant or plaintiff to each indemnified party
of an unconditional release from all liability in respect to such claim or litigation. The indemnifying party or parties shall not, in connection with any proceeding or related proceedings, be liable for the reasonable fees, disbursements and other
charges of more than one separate firm at any one time for all such indemnified party or parties unless (x) the employment of more than one counsel has been authorized in writing by the indemnifying party or parties, (y) a conflict or
potential conflict exists or may exist (based on advice of counsel to an indemnified party) between such indemnified party and the other indemnified parties or (z) based on advice of counsel, an indemnified party has reasonably concluded that
there may be legal defenses available to it that are different from or in addition to those available to the other indemnified parties, in each of which cases the indemnifying party shall be obligated to pay the reasonable fees and expenses of such
additional counsel or counsels. 
 (d) Contribution. If for any reason the indemnification provided for in the paragraphs (a) and
(b) of this Section 2.9 is unavailable to an indemnified party or insufficient to hold it harmless as contemplated by paragraphs (a) and (b) of this Section 2.9, then the indemnifying party shall contribute to the amount
paid or payable by the indemnified party as a result of such Loss in such proportion as is appropriate to reflect the relative fault of the indemnifying party on the one hand and the indemnified party on the other. The relative fault shall be
determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the indemnifying party or the
indemnified party and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such untrue statement or omission. Notwithstanding anything in this Section 2.9(d) to the contrary, no indemnifying
party (other than the Company) shall be required pursuant to this Section 2.9(d) to contribute any amount in excess of the amount by which the net proceeds received by such 

  

 17 

 
indemnifying party from the sale of Registrable Securities in the offering to which the Losses of the indemnified parties relate exceeds the amount of any
damages which such indemnifying party has otherwise been required to pay by reason of such untrue statement or omission. The parties hereto agree that it would not be just and equitable if contribution pursuant to this Section 2.9(d) were
determined by pro rata allocation or by any other method of allocation that does not take account of the equitable considerations referred to in the immediately preceding paragraph. No Person guilty of fraudulent misrepresentation (within the
meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any Person who was not guilty of such fraudulent misrepresentation. If indemnification is available under this Section 2.9, the indemnifying
parties shall indemnify each indemnified party to the full extent provided in Sections 2.9(a) and 2.9(b) hereof without regard to the relative fault of said indemnifying parties or indemnified party. 
 2.10. Rule 144. The Company covenants that it shall use its best efforts to file any reports required to be filed by it under the Securities Act
and the Exchange Act and shall take such further action as the holders of Registrable Securities may reasonably request, all to the extent required from time to time to enable such holders to sell Registrable Securities without registration under
the Securities Act within the limitation of the exemptions provided by Rule 144 under the Securities Act, as such Rules may be amended from time to time, or any similar Rule or regulation hereafter adopted by the Commission. 
 SECTION 3. MISCELLANEOUS 
 3.1.
Term. This Agreement shall terminate upon earlier of (i) the tenth anniversary of the date of this Agreement or (ii) the date as of which (A) all of the Registrable Securities have been sold pursuant to a Registration Statement
(but in no event prior to the applicable period referred to in Section 4(3) of the Securities Act and Rule 174 thereunder) or (B) the holders are permitted to sell their Registrable Securities under Rule 144(k) under the Securities Act (or
any similar provision then in force permitting the sale of restricted securities without limitation on the amount of securities sold or the manner of sale). The provisions of Section 2.9 and Section 2.10 shall survive any termination.

 3.2. Notices. All notices, other communications or documents provided for or permitted to be given hereunder, shall be made in
writing and shall be given either personally by hand-delivery, by facsimile transmission, by mailing the same in a sealed envelope, registered first-class mail, postage prepaid, return receipt requested, or by air courier guaranteeing overnight
delivery: 
  

 18 

 (a) if to the Company to: 
 NTR ACQUISITION CO. 
 100 Mill Plain Road, Suite 320 
 Danbury, CT 06811 
 Attention: Chief Executive Officer 
 Fax: (203) 546-3523 
 with a copy to: 
 Cleary Gottlieb Steen & Hamilton LLP 
 One Liberty Plaza 
 New York, NY 10003 
 Attention: Raymond B. Check, Esq. 
 Fax: (212) 225-3999 
 (b) if to an Investor, to the address set forth below such Investor’s name on the signature page hereto. 
 Each holder, by
written notice given to the Company in accordance with this Section 3.2, may change the address to which notices, other communications or documents are to be sent to such holder. All notices, other communications or documents shall be deemed to
have been duly given: (i) at the time delivered by hand, if personally delivered; (ii) when receipt is acknowledged in writing by addressee, if by facsimile transmission; (iii) five business days after having been deposited in the
mail, postage prepaid, if mailed by first class mail; or (iv) on the first business day with respect to which a reputable air courier guarantees delivery; provided, however, that notices of a change of address shall be effective
only upon receipt. 
 3.3. Successors, Assigns and Transferees. 
 (a) The registration rights of any holder under this Agreement with respect to any Registrable Securities may be transferred and assigned,
provided, however, that no such assignment shall be binding upon or obligate the Company to any such assignee unless and until the Company shall have received notice of such assignment as herein provided and a written agreement of the
assignee to be bound by the provisions of this Agreement. Any transfer or assignment made other than as provided in the first sentence of this Section 3.3 shall be null and void. 
 (b) This Agreement shall be binding upon and shall inure to the benefit of the parties hereto, and their respective successors and permitted assigns.

 3.4. Governing Law; Service of Process; Consent to Jurisdiction. (a) THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE AND TO BE PERFORMED WITHIN THAT STATE. 
 (b) To the fullest
extent permitted by applicable law, each party hereto (i) agrees that any claim, action or proceeding by such party seeking any relief whatsoever arising out of, or in connection with, this Agreement or the transactions contemplated hereby
shall be brought only in the United States District Court for the Southern District of New York and in any 

  

 19 

 
New York State court located in the Borough of Manhattan and not in any other State or Federal court in the United States of America or any court in any
other country, (ii) agrees to submit to the exclusive jurisdiction of such courts located in the State of New York for purposes of all legal proceedings arising out of, or in connection with, this Agreement or the transactions contemplated
hereby and (iii) irrevocably waives any objection which it may now or hereafter have to the laying of the venue of any such proceeding brought in such a court and any claim that any such proceeding brought in such a court has been brought in an
inconvenient forum. 
 3.5. Headings. The section and paragraph headings contained in this Agreement are for reference purposes only
and shall not in any way affect the meaning or interpretation of this Agreement. 
 3.6. Severability. Whenever possible, each
provision or portion of any provision of this Agreement will be interpreted in such manner as to be effective and valid under applicable law but if any provision or portion of any provision of this Agreement is held to be invalid, illegal or
unenforceable in any respect under any applicable law in any jurisdiction, such invalidity, illegality or unenforceability will not affect any other provision or portion of any provision in such jurisdiction, and this agreement will be reformed,
construed and enforced in such jurisdiction as if such invalid, illegal or unenforceable provision or portion of any provision had never been contained therein. 
 3.7. Amendment; Waiver. 
 (a) This Agreement may not be amended or modified and waivers and consents
to departures from the provisions hereof may not be given, except by an instrument or instruments in writing making specific reference to this Agreement and signed by the Company and the holders of a majority of Registrable Securities of each class
then outstanding. Each holder of any Registrable Securities at the time or thereafter outstanding shall be bound by any amendment, modification, waiver or consent authorized by this Section 3.7(a), whether or not such Registrable Securities
shall have been marked accordingly. 
 (b) The waiver by any party hereto of a breach of any provision of this Agreement shall not operate or
be construed as a further or continuing waiver of such breach or as a waiver of any other or subsequent breach. Except as otherwise expressly provided herein, no failure on the part of any party to exercise, and no delay in exercising, any right,
power or remedy hereunder, or otherwise available in respect hereof at law or in equity, shall operate as a waiver thereof, nor shall any single or partial exercise of such right, power or remedy by such party preclude any other or further exercise
thereof or the exercise of any other right, power or remedy. 
 3.8. Counterparts. This Agreement may be executed in any number of
separate counterparts and by the parties hereto in separate counterparts each of which when so executed shall be deemed to be an original and all of which together shall constitute one and the same agreement. 
 3.9. Attorney-In-Fact. The Investors hereby appoint and designate [INSERT NAME(S), as their agent and attorney-in-fact to take all actions
(including any decisions on behalf of the holders) and to deliver all documents and certificates with respect to this Agreement, including the making of any modifications or amendments hereto. The actions of either or both of the agents named in the
previous sentence in doing the foregoing are hereby affirmed, ratified, confirmed and approved in all respects. This power of attorney shall be revocable on the delivery of written notice of such revocation to the Company and [INSERT NAME(S) or
either of them. 
  

 20 

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

			
	NTR ACQUISITION CO.
		
	By:	 	  

		 	Name:
		 	Title:
	
	NTR PARTNERS LLC
	 [Address]

	Fax:	 	
		
	By:	 	  

		 	Mario E. Rodriguez
	
	ALTAMIRA VENTURES I LP
	 [Address]

	Fax:	 	
		
	By:	 	  

		 	Philipp L. Rimmler
	
	GILLIAM ENTERPRISES, LLC
	 [Address]

	Fax:	 	
		
	By:	 	  

		 	D. Duane Gilliam
	
	  

	WILLIAM E. HANTKE
	 [Address]

	Fax:	 	

  

 23 

			
	HENDRICKS FAMILY LLLP
	 [Address]

	Fax:	 	
	By:	 	Hendricks Family Holdings, Inc., General Partner
		
		 	  

		 	John K. Hendricks
		 	President
		
		 	  

		 	Maureen A. Hendricks
		 	Secretary – Treasurer
	
	  

	HENRY M. KUCHTA
	 [Address]

	Fax:	 	
	
	  

	BUFORD H. ORTALE
	 [Address]

	Fax:	 	
	
	  

	RANDAL K. QUARLES
	 [Address]

	Fax:	 	
	
	  

	MARIO E. RODRIGUEZ
	 [Address]

	Fax:	 	
	
	SEWANEE PARTNERS III, L.P.
	 [Address]

	Fax:	 	

					
			
		 	By:	 	  

		 		 	[Buford H. Ortale]

  

 24 

 Schedule I 
 NTR Partners LLC 
 Altamira Ventures I LP 
 Gilliam
Enterprises LLC 
 William E. Hantke 
 Hendricks Family LLLP

 Henry M. Kuchta 
 Buford H. Ortale 
 Randal K. Quarles 
 Mario E. Rodriguez 
 Sewanee Partners III, L.P. 
  

 25Form of Indemnity Agreement

 Exhibit 10.6 
 [FORM OF INDEMNIFICATION AGREEMENT] 
 INDEMNIFICATION AGREEMENT 
 This Indemnification Agreement (“Agreement”) is made as of
                    , 2007, by and between NTR Acquisition Co., a Delaware corporation (the “Company”), and
                         (“Indemnitee”). 
 RECITALS 
 WHEREAS, highly competent persons have become more reluctant to serve
publicly-held corporations as [directors] [officers] or in other capacities unless they are provided with adequate protection through insurance or adequate indemnification against inordinate risks of claims and actions against them arising out of
their service to and activities on behalf of the corporation; 
 WHEREAS, the Board of Directors of the Company (the “Board”) has
determined that, in order to attract and retain qualified individuals, the Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance to protect persons serving the Company and its subsidiaries from certain
liabilities. Although the furnishing of such insurance has been a customary and widespread practice among United States-based corporations and other business enterprises, the Company believes that, given current market conditions and trends, such
insurance may be available to it in the future only at higher premiums and with more exclusions. At the same time, directors, officers, and other persons in service to corporations or business enterprises are being increasingly subjected to
expensive and time-consuming litigation relating to, among other things, matters that traditionally would have been brought only against the Company or business enterprise itself. The By-laws and Amended and Restated Certificate of Incorporation of
the Company requires indemnification of the officers and directors of the Company. Indemnitee may also be entitled to indemnification pursuant to the General Corporation Law of the State of Delaware (the “DGCL”). The Amended and Restated
Certificate of Incorporation expressly provides for the Company to indemnify its officers and directors to the full extent permitted by Section 145 of the DGCL, and thereby contemplates that contracts may be entered into between the Company and
members of the Board and officers with respect to indemnification; 
 WHEREAS, the uncertainties relating to such insurance and to
indemnification have increased the difficulty of attracting and retaining such persons; 
 WHEREAS, the Board has determined that the
increased difficulty in attracting and retaining such persons is detrimental to the best interests of the Company’s stockholders and that the Company should act to assure such persons that there will be increased certainty of such protection in
the future; 
 WHEREAS, it is reasonable, prudent and necessary for the Company contractually to obligate itself to indemnify, and to advance
expenses on behalf of, such persons to the fullest extent permitted by applicable law so that they will serve or continue to serve the Company free from undue concern that they will not be so indemnified; 

 WHEREAS, this Agreement is a supplement to and in furtherance of the By-laws of the Company and any
resolutions adopted pursuant thereto, and shall not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder; 
 WHEREAS, Indemnitee does not regard the protection available under the Company’s By-laws and insurance as adequate in the present circumstances, and may not be willing to serve as an officer or director without
adequate protection, and the Company desires Indemnitee to serve in such capacity. Indemnitee is willing to serve, continue to serve and to take on additional service for or on behalf of the Company on the condition that she be so indemnified; and

 NOW, THEREFORE, in consideration of the premises and the covenants contained herein, the Company and Indemnitee do hereby covenant and
agree as follows: 
 Section 1. Services to the Company. Indemnitee agrees to serve as a [director] [officer] of the Company.
Indemnitee may at any time and for any reason resign from such position (subject to any other contractual obligation or any obligation imposed by operation of law), in which event the Company shall have no obligation under this Agreement to continue
Indemnitee in such position. This Agreement shall not be deemed an employment contract between the Company (or any of its subsidiaries or any Enterprise) and Indemnitee. Indemnitee specifically acknowledges that Indemnitee’s employment with the
Company (or any of its subsidiaries or any Enterprise), if any, is at will, and the Indemnitee may be discharged at any time for any reason, with or without cause, except as may be otherwise provided in any written employment contract between
Indemnitee and the Company (or any of its subsidiaries or any Enterprise), other applicable formal severance policies duly adopted by the Board, or, with respect to service as a director or officer of the Company, by the Company’s Certificate
of Incorporation, the Company’s By-laws, and the DGCL. The foregoing notwithstanding, this Agreement shall continue in force after Indemnitee has ceased to serve as an [officer] [director] of the Company. 
 Section 2. Definitions. As used in this Agreement: 
 (a) A “Change in Control” shall be deemed to occur upon the earliest to occur after the date of this Agreement of any of the following events: 
 i. Acquisition of Stock by Third Party. Any Person (as defined below) is or becomes the Beneficial Owner (as defined below), directly or indirectly, of
securities of the Company representing forty percent (40%) or more of the combined voting power of the Company’s then-outstanding securities; 
 ii. Change in Board. During any period of two (2) consecutive years (not including any period prior to the execution of this Agreement), individuals who at the beginning of such period constitute the Board, and
any new director (other than a director designated by a person who has entered into an agreement with the Company to effect a transaction described in Sections 2(a)(i) or 2(a)(iii)) whose election by the Board or nomination for election by the
Company’s stockholders was approved by a vote of at least two-thirds of the directors then still in office who either were directors at the beginning of the period or whose election or nomination for election was previously so approved, cease
for any reason to constitute at least a majority of the members of the Board; and 
  

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 iii. Corporate Transactions. The effective date of a merger or consolidation of the Company with any
other entity, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior to such merger or consolidation continuing to represent (either by remaining outstanding or by being
converted into voting securities of the surviving entity) more than 51% of the combined voting power of the voting securities of the surviving entity outstanding immediately after such merger or consolidation and with the power to elect at least a
majority of the board of directors or other governing body of such surviving entity. 
 For purposes of this Section 2(a), the following terms shall
have the following meanings: 
 (A) “Person” shall have the meaning as set forth in Sections 13(d) and 14(d) of the
Securities Exchange Act of 1934, as amended (the “Exchange Act”); provided, however, that Person shall exclude (i) the Company, (ii) any trustee or other fiduciary holding securities under an employee benefit plan of the Company,
and (iii) any corporation owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company. 
 (B) “Beneficial Owner” shall have the meaning given to such term in Rule 13d-3 under the Exchange Act; provided, however, that
Beneficial Owner shall exclude any Person otherwise becoming a Beneficial Owner by reason of the stockholders of the Company approving a merger of the Company with another entity. 
 (b) “Corporate Status” describes the status of a person who is or was a director, officer, employee or agent of the Company or of any
Enterprise. 
 (c) “Disinterested Director” means a director of the Company who is not and was not a party to the Proceeding in
respect of which indemnification is sought by Indemnitee. 
 (d) “Enterprise” shall mean the Company and any other corporation,
limited liability company, partnership, joint venture, trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, employee, agent or fiduciary. 
 (e) “Expenses” shall include all reasonable attorneys’ fees, retainers, court costs, transcript costs, fees of experts, witness fees,
travel expenses, duplicating costs, printing and binding costs, telephone charges, postage, delivery service fees, and all other disbursements or expenses of the types customarily incurred in connection with prosecuting, defending, preparing to
prosecute or defend, investigating, being or preparing to be a witness in, or otherwise participating in, a Proceeding. Expenses also shall include (i) Expenses incurred in connection with any appeal resulting from any Proceeding, including
without limitation the 

  

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premium, security for, and other costs relating to any cost bond, supersedeas bond, or other appeal bond or its equivalent, and (ii) for purposes of
Section 13(d) only, Expenses incurred by Indemnitee in connection with the interpretation, enforcement or defense of Indemnitee’s rights under this Agreement, by litigation or otherwise. Expenses, however, shall not include amounts paid in
settlement by Indemnitee or the amount of judgments or fines against Indemnitee. 
 (f) “Independent Counsel” means a law firm, or
a member of a law firm, that is experienced in matters of corporation law and neither presently is, nor in the past five years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such party (other
than with respect to matters concerning the Indemnitee under this Agreement, or of other indemnitees under similar indemnification agreements), or (ii) any other party to the Proceeding giving rise to a claim for indemnification hereunder.
Notwithstanding the foregoing, the term “Independent Counsel” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or
Indemnitee in an action to determine Indemnitee’s rights under this Agreement. The Company agrees to pay the reasonable fees and expenses of the Independent Counsel referred to above and to fully indemnify such counsel against any and all
Expenses, claims, liabilities and damages arising out of or relating to this Agreement or its engagement pursuant hereto. 
 (g) The term
“Proceeding” shall include any threatened, pending or completed action, suit, arbitration, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or any other actual, threatened or completed proceeding,
whether brought in the right of the Company or otherwise and whether of a civil, criminal, administrative legislative, or investigative nature, including any appeal therefrom, in which Indemnitee was, is or will be involved as a party, potential
party, non-party witness or otherwise by reason of the fact that Indemnitee is or was a director or officer of the Company, by reason of any action taken by him or of any action on his part while acting as director or officer of the Company, or by
reason of the fact that he is or was serving at the request of the Company as a director, officer, employee or agent of another corporation, limited liability company, partnership, joint venture, trust or other enterprise, in each case whether or
not serving in such capacity at the time any liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses can be provided under this Agreement; except one initiated by an Indemnitee to enforce his rights
under this Agreement. 
 (h) Reference to “other enterprise” shall include employee benefit plans; references to “fines”
shall include any excise tax assessed with respect to any employee benefit plan; references to “serving at the request of the Company” shall include any service as a director, officer, employee or agent of the Company which imposes duties
on, or involves services by, such director, officer, employee or agent with respect to an employee benefit plan, its participants or beneficiaries; and a person who acted in good faith and in a manner he reasonably believed to be in the best
interests of the participants and beneficiaries of an employee benefit plan shall be deemed to have acted in manner “not opposed to the best interests of the Company” as referred to in this Agreement. 
 Section 3. Indemnity in Third-Party Proceedings. The Company shall indemnify Indemnitee in accordance with the provisions of this
Section 3 if Indemnitee is, or is threatened 

  

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to be made, a party to or a participant in any Proceeding, other than a Proceeding by or in the right of the Company to procure a judgment in its favor.
Pursuant to this Section 3, Indemnitee shall be indemnified to the fullest extent permitted by applicable law against all Expenses, judgments, fines and amounts paid in settlement actually and reasonably incurred by Indemnitee or on his behalf
in connection with such Proceeding or any claim, issue or matter therein, if Indemnitee acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the Company and, in the case of a criminal proceeding
had no reasonable cause to believe that his conduct was unlawful. 
 Section 4. Indemnity in Proceedings by or in the Right of the
Company. The Company shall indemnify Indemnitee in accordance with the provisions of this Section 4 if Indemnitee is, or is threatened to be made, a party to or a participant in any Proceeding by or in the right of the Company to procure a
judgment in its favor. Pursuant to this Section 4, Indemnitee shall be indemnified to the fullest extent permitted by applicable law against all Expenses actually and reasonably incurred by him or on his behalf in connection with such
Proceeding or any claim, issue or matter therein, if Indemnitee acted in good faith and in a manner he reasonably believed to be in or not opposed to the best interests of the Company. No indemnification for Expenses shall be made under this
Section 4 in respect of any claim, issue or matter as to which Indemnitee shall have been finally adjudged by a court to be liable to the Company, unless and only to the extent that the Delaware Court of Chancery or any court in which the
Proceeding was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, Indemnitee is fairly and reasonably entitled to indemnification. 
 Section 5. Indemnification for Expenses of a Party Who is Wholly or Partly Successful. Notwithstanding any other provisions of this
Agreement, to the fullest extent permitted by applicable law and to the extent that Indemnitee is a party to (or a participant in) and is successful, on the merits or otherwise, in any Proceeding or in defense of any claim, issue or matter therein,
in whole or in part, the Company shall indemnify Indemnitee against all Expenses actually and reasonably incurred by him in connection therewith. If Indemnitee is not wholly successful in such Proceeding but is successful, on the merits or
otherwise, as to one or more but less than all claims, issues or matters in such Proceeding, the Company shall indemnify Indemnitee against all Expenses actually and reasonably incurred by him or on his behalf in connection with each successfully
resolved claim, issue or matter. If the Indemnitee is not wholly successful in such Proceeding, the Company also shall indemnify Indemnitee against all Expenses reasonably incurred in connection with a claim, issue or matter related to any claim,
issue, or matter on which the Indemnitee was successful. For purposes of this Section and without limitation, the termination of any claim, issue or matter in such a Proceeding by dismissal, with or without prejudice, shall be deemed to be a
successful result as to such claim, issue or matter. 
 Section 6. Indemnification For Expenses of a Witness. Notwithstanding any
other provision of this Agreement, to the fullest extent permitted by applicable law and to the extent that Indemnitee is, by reason of his Corporate Status, a witness in any Proceeding to which Indemnitee is not a party, he shall be indemnified
against all Expenses actually and reasonably incurred by him or on his behalf in connection therewith. 
  

 5 

 Section 7. Additional Indemnification. 
 (a) Notwithstanding any limitation in Sections 3, 4, or 5, the Company shall indemnify Indemnitee to the fullest extent permitted by applicable law if
Indemnitee is a party to or threatened to be made a party to any Proceeding (including a Proceeding by or in the right of the Company to procure a judgment in its favor) against all Expenses, judgments, fines and amounts paid in settlement actually
and reasonably incurred by Indemnitee in connection with the Proceeding. 
 (b) For purposes of Section 7(a), the meaning of the phrase
“to the fullest extent permitted by applicable law” shall include, but not be limited to: 
 i. to the fullest extent permitted by
the provision of the DGCL that authorizes or contemplates additional indemnification by agreement, or the corresponding provision of any amendment to or replacement of the DGCL, and 
 ii. to the fullest extent authorized or permitted by any amendments to or replacements of the DGCL adopted after the date of this Agreement that
increase the extent to which a corporation may indemnify its officers and directors. 
 Section 8. Exclusions. Notwithstanding
any provision in this Agreement, the Company shall not be obligated under this Agreement to make any indemnity in connection with any claim: 
 (a) for which payment has actually been made to or on behalf of Indemnitee under any insurance policy or other indemnity provision, except with respect to any excess beyond the amount paid under such insurance policy or other indemnity
provision; or 
 (b) for (i) an accounting of profits made from the purchase and sale (or sale and purchase) by Indemnitee of securities
of the Company within the meaning of Section 16(b) of the Exchange Act (as defined in Section 2(a) hereof) or similar provisions of state statutory law or common law, or (ii) any reimbursement of the Company by the Indemnitee of any
bonus or other incentive-based or equity-based compensation or of any profits realized by the Indemnitee from the sale of securities of the Company, as required in each case under the Exchange Act (including any such reimbursements that arise from
an accounting restatement of the Company pursuant to Section 304 of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”), or the payment to the Company of profits arising from the purchase and sale by Indemnitee of securities in
violation of Section 306 of the Sarbanes-Oxley Act), or 
 (c) except as provided in Section 13(d) of this Agreement, in connection
with any Proceeding (or any part of any Proceeding) initiated by Indemnitee, including any Proceeding (or any part of any Proceeding) initiated by Indemnitee against the Company or its directors, officers, employees or other indemnitees, unless
(i) the Board authorized the Proceeding (or any part of any Proceeding) prior to its initiation or (ii) the Company provides the indemnification, in its sole discretion, pursuant to the powers vested in the Company under applicable law.

  

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 Section 9. Advances of Expenses. Notwithstanding any provision of this Agreement to the
contrary, the Company shall advance, to the extent not prohibited by law, the Expenses incurred by Indemnitee in connection with any Proceeding, and such advancement shall be made within thirty (30) days after the receipt by the Company of a
statement or statements requesting such advances from time to time, whether prior to or after final disposition of any Proceeding. Advances shall be unsecured and interest free. Advances shall be made without regard to Indemnitee’s ability to
repay the Expenses and without regard to Indemnitee’s ultimate entitlement to indemnification under the other provisions of this Agreement. Advances shall include any and all reasonable Expenses incurred pursuing an action to enforce this right
of advancement, including Expenses incurred preparing and forwarding statements to the Company to support the advances claimed. The Indemnitee shall qualify for advances upon the execution and delivery to the Company of this Agreement, which shall
constitute an undertaking providing that the Indemnitee undertakes to repay the advance to the extent that it is ultimately determined that Indemnitee is not entitled to be indemnified by the Company. This Section 9 shall not apply to any claim
made by Indemnitee for which indemnity is excluded pursuant to Section 8. 
 Section 10. Procedure for Notification and Defense
of Claim. 
 (a) Indemnitee shall notify the Company in writing of any matter with respect to which Indemnitee intends to seek
indemnification or advancement of Expenses hereunder as soon as reasonably practicable following the receipt by Indemnitee of written notice thereof. The written notification to the Company shall include a description of the nature of the Proceeding
and the facts underlying the Proceeding. To obtain indemnification under this Agreement, Indemnitee shall submit to the Company a written request, including therein or therewith such documentation and information as is reasonably available to
Indemnitee and is reasonably necessary to determine whether and to what extent Indemnitee is entitled to indemnification following the final disposition of such action, suit or proceeding. The omission by Indemnitee to notify the Company hereunder
will not relieve the Company from any liability which it may have to Indemnitee hereunder or otherwise than under this Agreement, and any delay in so notifying the Company shall not constitute a waiver by Indemnitee of any rights under this
Agreement. The Secretary of the Company shall, promptly upon receipt of such a request for indemnification, advise the Board in writing that Indemnitee has requested indemnification. 
 (b) The Company will be entitled to participate in the Proceeding at its own expense. 
 Section 11. Procedure Upon Application for Indemnification. 
 (a) Upon written request by Indemnitee for indemnification pursuant to Section 10(a), a determination, if required by applicable law, with respect to Indemnitee’s entitlement thereto shall be made in the
specific case: (i) if a Change in Control shall have occurred, by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to Indemnitee; or (ii) if a Change in Control shall not have occurred, (A) by
a majority vote of the Disinterested Directors, even though less than a quorum of the Board, (B) by a committee of Disinterested Directors designated by a majority vote of the Disinterested Directors, even though less than a quorum of the
Board, (C) if there are no such Disinterested 

  

 7 

 
Directors or, if such Disinterested Directors so direct, by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to
Indemnitee or (D) if so directed by the Board, by the stockholders of the Company; and, if it is so determined that Indemnitee is entitled to indemnification, payment to Indemnitee shall be made within ten (10) days after such
determination. Indemnitee shall cooperate with the person, persons or entity making such determination with respect to Indemnitee’s entitlement to indemnification, including providing to such person, persons or entity upon reasonable advance
request any documentation or information which is not privileged or otherwise protected from disclosure and which is reasonably available to Indemnitee and reasonably necessary to such determination. Any costs or Expenses (including attorneys’
fees and disbursements) incurred by Indemnitee in so cooperating with the person, persons or entity making such determination shall be borne by the Company (irrespective of the determination as to Indemnitee’s entitlement to indemnification)
and the Company hereby indemnifies and agrees to hold Indemnitee harmless therefrom. 
 (b) In the event the determination of entitlement to
indemnification is to be made by Independent Counsel pursuant to Section 11(a) hereof, the Independent Counsel shall be selected as provided in this Section 11(b). If a Change in Control shall not have occurred, the Independent Counsel
shall be selected by the Board, and the Company shall give written notice to Indemnitee advising him of the identity of the Independent Counsel so selected. If a Change in Control shall have occurred, the Independent Counsel shall be selected by
Indemnitee (unless Indemnitee shall request that such selection be made by the Board, in which event the preceding sentence shall apply), and Indemnitee shall give written notice to the Company advising it of the identity of the Independent Counsel
so selected. In either event, Indemnitee or the Company, as the case may be, may, within ten (10) days after such written notice of selection shall have been given, deliver to the Company or to Indemnitee, as the case may be, a written
objection to such selection; provided, however, that such objection may be asserted only on the ground that the Independent Counsel so selected does not meet the requirements of “Independent Counsel” as defined in Section 2 of this
Agreement, and the objection shall set forth with particularity the factual basis of such assertion. Absent a proper and timely objection, the person so selected shall act as Independent Counsel. If such written objection is so made and
substantiated, the Independent Counsel so selected may not serve as Independent Counsel unless and until such objection is withdrawn or a court has determined that such objection is without merit. If, within twenty (20) days after the later of
submission by Indemnitee of a written request for indemnification pursuant to Section 10(a) hereof and the final disposition of the Proceeding, no Independent Counsel shall have been selected and not objected to, either the Company or
Indemnitee may petition a court of competent jurisdiction for resolution of any objection which shall have been made by the Company or Indemnitee to the other’s selection of Independent Counsel and/or for the appointment as Independent Counsel
of a person selected by the Court or by such other person as the Court shall designate, and the person with respect to whom all objections are so resolved or the person so appointed shall act as Independent Counsel under Section 11(a) hereof.
Upon the due commencement of any judicial proceeding or arbitration pursuant to Section 13(a) of this Agreement, Independent Counsel shall be discharged and relieved of any further responsibility in such capacity (subject to the applicable
standards of professional conduct then prevailing). 
  

 8 

 Section 12. Presumptions and Effect of Certain Proceedings. 
 (a) In making a determination with respect to entitlement to indemnification hereunder, the person or persons or entity making such determination shall,
to the fullest extent not prohibited by law, presume that Indemnitee is entitled to indemnification under this Agreement if Indemnitee has submitted a request for indemnification in accordance with Section 10(a) of this Agreement, and the
Company shall, to the fullest extent not prohibited by law, have the burden of proof to overcome that presumption in connection with the making by any person, persons or entity of any determination contrary to that presumption. Neither the failure
of the Company (including by its directors or independent legal counsel) to have made a determination prior to the commencement of any action pursuant to this Agreement that indemnification is proper in the circumstances because Indemnitee has met
the applicable standard of conduct, nor an actual determination by the Company (including by its directors or independent legal counsel) that Indemnitee has not met such applicable standard of conduct, shall be a defense to the action or create a
presumption that Indemnitee has not met the applicable standard of conduct. 
 (b) Subject to Section 13(e), if the person, persons or
entity empowered or selected under Section 11 of this Agreement to determine whether Indemnitee is entitled to indemnification shall not have made a determination within sixty (60) days after receipt by the Company of the request therefor,
the requisite determination of entitlement to indemnification shall, to the fullest extent not prohibited by law, be deemed to have been made and Indemnitee shall be entitled to such indemnification, absent (i) a misstatement by Indemnitee of a
material fact, or an omission of a material fact necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law;
provided, however, that such 60-day period may be extended for a reasonable time, not to exceed an additional thirty (30) days, if the person, persons or entity making the determination with respect to entitlement to indemnification in good
faith requires such additional time for the obtaining or evaluating of documentation and/or information relating thereto; and provided, further, that the foregoing provisions of this Section 12(b) shall not apply (i) if the determination
of entitlement to indemnification is to be made by the stockholders pursuant to Section 11(a) of this Agreement and if (A) within fifteen (15) days after receipt by the Company of the request for such determination the Board has
resolved to submit such determination to the stockholders for their consideration at an annual meeting thereof to be held within seventy-five (75) days after such receipt and such determination is made thereat, or (B) a special meeting of
stockholders is called within fifteen (15) days after such receipt for the purpose of making such determination, such meeting is held for such purpose within sixty (60) days after having been so called and such determination is made
thereat, or (ii) if the determination of entitlement to indemnification is to be made by Independent Counsel pursuant to Section 11(a) of this Agreement. 
 (c) The termination of any Proceeding or of any claim, issue or matter therein, by judgment, order, settlement or conviction, or upon a plea of nolo contendere or its equivalent, shall not (except as otherwise
expressly provided in this Agreement) of itself adversely affect the right of Indemnitee to indemnification or create a presumption that Indemnitee did not act in good faith and in a manner which he reasonably believed to be in or not opposed to the
best interests of the Company or, with respect to any criminal Proceeding, that Indemnitee had reasonable cause to believe that his conduct was unlawful. 
  

 9 

 (d) Reliance as Safe Harbor. For purposes of any determination of good faith, Indemnitee shall be deemed
to have acted in good faith if Indemnitee’s action is based on the records or books of account of the Enterprise, including financial statements, or on information supplied to Indemnitee by the officers of the Enterprise in the course of their
duties, or on the advice of legal counsel for the Enterprise or on information or records given or reports made to the Enterprise by an independent certified public accountant or by an appraiser or other expert selected with the reasonable care by
the Enterprise. The provisions of this Section 12(d) shall not be deemed to be exclusive or to limit in any way the other circumstances in which the Indemnitee may be deemed to have met the applicable standard of conduct set forth in this
Agreement. 
 (e) Actions of Others. The knowledge and/or actions, or failure to act, of any director, officer, agent or employee of the
Enterprise shall not be imputed to Indemnitee for purposes of determining the right to indemnification under this Agreement. 
 Section 13. Remedies of Indemnitee. 
 (a) Subject to Section 13(e), in the event that (i) a determination is
made pursuant to Section 11 of this Agreement that Indemnitee is not entitled to indemnification under this Agreement, (ii) advancement of Expenses is not timely made pursuant to Section 9 of this Agreement, (iii) no
determination of entitlement to indemnification shall have been made pursuant to Section 11(a) of this Agreement within ninety (90) days after receipt by the Company of the request for indemnification, (iv) payment of indemnification
is not made pursuant to Section 5 or 6 or the last sentence of Section 11(a) of this Agreement within ten (10) days after receipt by the Company of a written request therefor, (v) payment of indemnification pursuant to
Section 3, 4 or 7 of this Agreement is not made within ten (10) days after a determination has been made that Indemnitee is entitled to indemnification, or (vi) in the event that the Company or any other person takes or threatens to
take any action to declare this Agreement void or unenforceable, or institutes any litigation or other action or Proceeding designed to deny, or to recover from, the Indemnitee the benefits provided or intended to be provided to the Indemnitee
hereunder, Indemnitee shall be entitled to an adjudication by a court of his entitlement to such indemnification or advancement of Expenses. Alternatively, Indemnitee, at his option, may seek an award in arbitration to be conducted by a single
arbitrator pursuant to the Commercial Arbitration Rules of the American Arbitration Association. Indemnitee shall commence such proceeding seeking an adjudication or an award in arbitration within 180 days following the date on which Indemnitee
first has the right to commence such proceeding pursuant to this Section 13(a); provided, however, that the foregoing clause shall not apply in respect of a proceeding brought by Indemnitee to enforce his rights under Section 5 of this
Agreement. The Company shall not oppose Indemnitee’s right to seek any such adjudication or award in arbitration. 
 (b) In the event
that a determination shall have been made pursuant to Section 11(a) of this Agreement that Indemnitee is not entitled to indemnification, any judicial proceeding or arbitration commenced pursuant to this Section 13 shall be conducted in
all respects as a de novo trial, or arbitration, on the merits and Indemnitee shall not be prejudiced by reason of that adverse determination. In any judicial proceeding or arbitration commenced pursuant to this Section 13 the Company shall
have the burden of proving Indemnitee is not entitled to indemnification or advancement of Expenses, as the case may be. 
  

 10 

 (c) If a determination shall have been made pursuant to Section 11(a) of this Agreement that
Indemnitee is entitled to indemnification, the Company shall be bound by such determination in any judicial proceeding or arbitration commenced pursuant to this Section 13, absent (i) a misstatement by Indemnitee of a material fact, or an
omission of a material fact necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law. 
 (d) The Company shall, to the fullest extent not prohibited by law, be precluded from asserting in any judicial proceeding or arbitration commenced
pursuant to this Section 13 that the procedures and presumptions of this Agreement are not valid, binding and enforceable and shall stipulate in any such court or before any such arbitrator that the Company is bound by all the provisions of
this Agreement. It is the intent of the Company that the Indemnitee not be required to incur legal fees or other Expenses associated with the interpretation, enforcement or defense of Indemnitee’s rights under this Agreement by litigation or
otherwise because the cost and expense thereof would substantially detract from the benefits intended to be extended to the Indemnitee hereunder. The Company shall indemnify Indemnitee against any and all Expenses and, if requested by Indemnitee,
shall (within ten (10) days after receipt by the Company of a written request therefor) advance, to the extent not prohibited by law, such Expenses to Indemnitee, which are incurred by Indemnitee in connection with any action brought by
Indemnitee for indemnification or advance of Expenses from the Company under this Agreement or under any directors’ and officers’ liability insurance policies maintained by the Company, regardless of whether Indemnitee ultimately is
determined to be entitled to such indemnification, advancement of Expenses or insurance recovery, as the case may be. 
 (e) Notwithstanding
anything in this Agreement to the contrary, no determination as to entitlement to indemnification under this Agreement shall be required to be made prior to the final disposition of the Proceeding. 
 Section 14. Non-exclusivity; Survival of Rights; Insurance; Subrogation. 
 (a) The rights of indemnification and to receive advancement of Expenses as provided by this Agreement shall not be deemed exclusive of any other rights
to which Indemnitee may at any time be entitled under applicable law, the Company’s Certificate of Incorporation, the Company’s By-laws, any agreement, a vote of stockholders or a resolution of directors, or otherwise. No amendment,
alteration or repeal of this Agreement or of any provision hereof shall limit or restrict any right of Indemnitee under this Agreement in respect of any action taken or omitted by such Indemnitee in his Corporate Status prior to such amendment,
alteration or repeal. To the extent that a change in Delaware law, whether by statute or judicial decision, permits greater indemnification or advancement of Expenses than would be afforded currently under the Company’s By-laws, Amended and
Restated Certificate of Incorporation and this Agreement, it is the intent of the parties hereto that Indemnitee shall enjoy by this Agreement the greater benefits so afforded by such change. No right or remedy herein conferred is intended to be
exclusive of any other right or remedy, and every other right and remedy shall be cumulative and in addition to every other right and remedy given hereunder or now or 

  

 11 

 
hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the
concurrent assertion or employment of any other right or remedy. 
 (b) To the extent that the Company maintains an insurance policy or
policies providing liability insurance for directors, officers, employees, or agents of the Company or of any Enterprise, Indemnitee shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the
coverage available for any such director, officer, employee or agent under such policy or policies. If, at the time of the receipt of a notice of a claim pursuant to the terms hereof, the Company has director and officer liability insurance in
effect, the Company shall give prompt notice of the commencement of such proceeding to the insurers in accordance with the procedures set forth in the respective policies. The Company shall thereafter take all necessary or desirable action to cause
such insurers to pay, on behalf of the Indemnitee, all amounts payable as a result of such proceeding in accordance with the terms of such policies. 
 (c) In the event of any payment under this Agreement, the Company shall be subrogated to the extent of such payment to all of the rights of recovery of Indemnitee, who shall execute all papers required and take all
action necessary to secure such rights, including execution of such documents as are necessary to enable the Company to bring suit to enforce such rights. 
 (d) The Company’s obligation to indemnify or advance Expenses hereunder in respect of Indemnitee’s service to an Enterprise shall be reduced by any amount Indemnitee has actually received as indemnification
or advancement of Expenses from such Enterprise. 
 Section 15. Duration of Agreement. This Agreement shall continue until and
terminate upon the later of: (a) ten (10) years after the date that Indemnitee shall have ceased to serve as a [director] [officer] of the Company or (b) one (1) year after the final termination of any Proceeding then pending in
respect of which Indemnitee is granted rights of indemnification or advancement of Expenses hereunder and of any proceeding commenced by Indemnitee pursuant to Section 13 of this Agreement relating thereto. This Agreement shall be binding upon
the Company and its successors and assigns and shall inure to the benefit of Indemnitee and his heirs, executors and administrators. 
 Section 16. Severability. If any provision or provisions of this Agreement shall be held to be invalid, illegal or unenforceable for any reason whatsoever: (a) the validity, legality and enforceability of the remaining
provisions of this Agreement (including without limitation, each portion of any Section of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall not in
any way be affected or impaired thereby and shall remain enforceable to the fullest extent permitted by law; (b) such provision or provisions shall be deemed reformed to the extent necessary to conform to applicable law and to give the maximum
effect to the intent of the parties hereto; and (c) to the fullest extent possible, the provisions of this Agreement (including, without limitation, each portion of any Section of this Agreement containing any such provision held to be invalid,
illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall be construed so as to give effect to the intent manifested thereby. 
  

 12 

 Section 17. Enforcement. 
 (a) The Company expressly confirms and agrees that it has entered into this Agreement and assumed the obligations imposed on it hereby in order to induce
Indemnitee to serve as a director or officer of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a director or officer of the Company. 
 (b) This Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes all prior
agreements and understandings, oral, written and implied, between the parties hereto with respect to the subject matter hereof; provided, however, that this Agreement is a supplement to and in furtherance of the Certificate of Incorporation of the
Company, the By-laws of the Company and applicable law, and shall not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder. 
 Section 18. Modification and Waiver. No supplement, modification or amendment of this Agreement shall be binding unless executed in writing by the parties thereto. No waiver of any of the provisions of
this Agreement shall be deemed or shall constitute a waiver of any other provisions of this Agreement nor shall any waiver constitute a continuing waiver. 
 Section 19. Notice by Indemnitee. Indemnitee agrees promptly to notify the Company in writing upon being served with any summons, citation, subpoena, complaint, indictment, information or other document
relating to any Proceeding or matter which may be subject to indemnification or advancement of Expenses covered hereunder. The failure of Indemnitee to so notify the Company shall not relieve the Company of any obligation which it may have to the
Indemnitee under this Agreement or otherwise. 
 Section 20. Notices. All notices, requests, demands and other communications
under this Agreement shall be in writing and shall be deemed to have been duly given if (a) delivered by hand and receipted for by the party to whom said notice or other communication shall have been directed, (b) mailed by certified or
registered mail with postage prepaid, on the third business day after the date on which it is so mailed, (c) mailed by reputable overnight courier and receipted for by the party to whom said notice or other communication shall have been
directed or (d) sent by facsimile transmission, with receipt of oral confirmation that such transmission has been received: 
 (a) If to
Indemnitee, at the address indicated on the signature page of this Agreement, or such other address as Indemnitee shall provide to the Company. 
 (b) If to the Company, to 
 NTR Acquisition Co. 
 100 Mill Plain Road, Suite 320 
 Danbury, CT 06811 
 Attention: Corporate Secretary 
 or to any other address as
may have been furnished to Indemnitee by the Company. 
  

 13 

 Section 21. Contribution. To the fullest extent permissible under applicable law, if the
indemnification provided for in this Agreement is unavailable to Indemnitee for any reason whatsoever, the Company, in lieu of indemnifying Indemnitee, shall contribute to the amount incurred by Indemnitee, whether for judgments, fines, penalties,
excise taxes, amounts paid or to be paid in settlement and/or for Expenses, in connection with any claim relating to an indemnifiable event under this Agreement, in such proportion as is deemed fair and reasonable in light of all of the
circumstances of such Proceeding in order to reflect (i) the relative benefits received by the Company and Indemnitee as a result of the event(s) and/or transaction(s) giving cause to such Proceeding; and/or (ii) the relative fault of the
Company (and its directors, officers, employees and agents) and Indemnitee in connection with such event(s) and/or transaction(s). 
 Section 22. Applicable Law and Consent to Jurisdiction. This Agreement and the legal relations among the parties shall be governed by, and construed and enforced in accordance with, the laws of the State of Delaware, without
regard to its conflict of laws rules. Except with respect to any arbitration commenced by Indemnitee pursuant to Section 13(a) of this Agreement, the Company and Indemnitee hereby irrevocably and unconditionally (i) agree that any action
or proceeding arising out of or in connection with this Agreement shall be brought only in the Chancery Court of the State of Delaware (the “Delaware Court”), and not in any other state or federal court in the United States of America or
any court in any other country, (ii) consent to submit to the exclusive jurisdiction of the Delaware Court for purposes of any action or proceeding arising out of or in connection with this Agreement, (iii) waive any objection to the
laying of venue of any such action or proceeding in the Delaware Court, and (iv) waive, and agree not to plead or to make, any claim that any such action or proceeding brought in the Delaware Court has been brought in an improper or
inconvenient forum. 
 Section 23. Identical Counterparts. This Agreement may be executed in one or more counterparts, each of
which shall for all purposes be deemed to be an original but all of which together shall constitute one and the same Agreement. Only one such counterpart signed by the party against whom enforceability is sought needs to be produced to evidence the
existence of this Agreement. 
 Section 24. Miscellaneous. Use of the masculine pronoun shall be deemed to include usage of the
feminine pronoun where appropriate. The headings of the paragraphs of this Agreement are inserted for convenience only and shall not be deemed to constitute part of this Agreement or to affect the construction thereof. 
 IN WITNESS WHEREOF, the parties have caused this Agreement to be signed as of the day and year first above written. 
  

									
	NTR ACQUISITION CO.	 		 	INDEMNITEE
				
	 By:
	 	  
	 		 	  

	Name:	 		 		 	Name:	 	  

	Office:	 		 		 	Address:	 	  

		 		 		 		 	  

  

 14

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