Document:

Exhibit 4.91

Exhibit 4.91 

	Glenn Melosh 	November 6, 2007 
	2685 Sunrise Avenue 	  
	Santa Rosa, CA 	  
	95409 	  

Dear Glenn:

RE: CHIEF DEVELOPMENT GEOLOGIST

I am pleased to confirm that Nevada Geothermal Power Company
(NGPC) wishes to secure your services on a long term basis by entering into a
contract under which you to provide geological and exploration management
services to the NGPC. You will report to Kim Niggemann, Director of Resource
Exploration.

NGPC will pay a retainer amount of $10,000/mo to December 31,
2008 which will be payment for 15 days/month of dedicated work by you to
exclusively for NGPC. Additional days worked in any month will be charged at
$750/day. As an independent consultant, you will provide your own home office
support, WC coverage and general liability insurance.

Geological planning and management work can be done from your
home office in Santa Rosa, CA. The contract will require work out of NGPC's
Reno, Nevada and on projects in the field. When away from your home office we
will cover all room and board and travel expenses upon submittal of receipts. We
will reimburse you on a mileage rate for the use of your personal truck on NGPC
business at the rate of $.50/mile or, alternatively, we will provide you with a
vehicle for field work.

Your primary role will be to design and implement resource
exploration and development programs at the Company's geothermal properties in
Nevada and Oregon. You will assist in planning relating to the Blue Mountain
development drilling currently underway. You will have a primary role in
updating the reservoir model for the Blue Mountain Resource as the project is
developed to production. As your role and the work you are performing increases,
NGPC would like the opportunity to increase the number of dedicated work hours
from 15 days per month to some mutually agreeable number.

We are looking forward to an exciting future with Nevada
Geothermal Power Company and would be very pleased to have you on the team. I
look forward to working with you.

If you are in agreement with the general terms outlined above,
please sign where indicated below. We will replace this letter of understanding
with a contract agreement.

Yours Sincerely,

	NEVADA GEOTHERMAL POWER COMPANY 	Offer accepted: 
	  	  
	  	  
	  	  
	  	  
	     Brian D, Fairbank, P.Eng. 	Glenn Melosh 
	     PresidentExhibit 4.92

Exhibit 4.92 

	October 1. 2007 
	  
	Fairbank Engineering Ltd. 
	900-409 Granville St. 
	Vancouver, British Columbia V6C 1T2

	Attention: 	Brian D. Fairbank 

Dear Sirs/Mesdames:

	Re: 	Agreement to purchase assets and to retain
      employees 

This letter shall confirm our agreement whereby Nevada
Geothermal Power Inc. (“NGP”) has agreed with Fairbank Engineering Ltd. (“FEL”)
to acquire certain assets owned by FEL, and to employ certain FEL employees.

The parties hereto acknowledge that:

	 	(a) 	
      FEL has provided geological and geothermal consulting
      services to NGP for many years on an “as needed” basis;

	 	 	 
	 	(b) 	
      the operations of NGP have developed to the point where
      NGP requires the services of certain key FEL employees on a full-time
      basis;

	 	 	 
	 	(c) 	
      as a result of this agreement, the business operations of
      FEL will come to an end, therefore certain FEL Assets, defined below, that
      are necessary for the operations of NGP will be purchased by NGP;
    and

	 	 	 
	 	(d) 	
      NGP has obtained an independent evaluation of the current
      value of the FEL Assets, defined below, and the purchase price for the FEL
      Assets under this Agreement is equal to the fair market value for such
      assets.

Based upon the foregoing, the parties hereto hereby agree as
follows:

	2. 	
      NGP shall acquire certain assets owned by FEL, details of
      which are described as Schedule “A” hereto, for the consideration
      indication below;

	 	(a) 	 	Exploration
      equipment 	 	$	 32,850 	 
	 	(b) 	 	Office equipment 	 	$	 25,087 	 
	 	(c) 	 	Computer
      equipment 	 	$	 9,860 	 
	 	(d) 	 	Software 	 	$	 11,067 	 
	 	(e) 	 	Vehicles 	 	$	 23,279 	 
	 	  	 	Total 	 	$	 102,143 	 

(the “Asset Purchase Price”)

The Asset Purchase Price shall be paid
by NGP to FEL on the Effective Date, as defined below.

	3. 	
      NGP and FEL agree that certain key FEL employees
      described below shall be employed by NGP effective as of October 1, 2007
      on substantially the same terms as they were employed by FEL, and NGP
      shall provide written confirmation of such employment to each of the
      following FEL employees

	Name 	 	J o b
      T i t l e 	 	 	FEL Salary (Annual) 	 
	Kim Niggemann 	 	Project Director 	 	$	 95,000 	 
	Ryan Nelson 	 	Manager of Field Operations 	 	$	 70,000 	 
	Jeremias Bustalinio 	 	GIS Analyst Assistant 	 	$	 52,500 	 
	Laura Georgescu 	 	Controller 	 	$	 45,000 	 
	  	 	  	 	 	  	 
	  	 	  	 	$	 262,500 	 

		
      (collectively, the “Employees”)

	 	 	 
	4. 	
      As further consideration for FEL's agreement to
      relinquish its key Employees to NGP, which shall effectively end FEL's
      consulting business, FEL shall also receive from NGP consideration equal
      to six (6) months annual salary for each Employee, having a total value of
      $131,250. This sum shall he satisfied by the issue to FEL of 175,000
      common shares in the capital of NGP having a deemed price of $0.75 per
      share (the “Bonus Shares”). The Bonus Shares shall be issued by NGP to FEL
      on the Effective Date, as defined below.

	 	 	 
	5. 	
      In the event that any of the Employees should
    either:

	 	 	 
		(i) 	
      voluntarily terminate their employment with NGP within
      six (6) months from the date of this Agreement; or

	 	 	 
		(ii) 	
      be terminated by NO!' for any reason whatsoever within
      six (6) months from the date of this Agreement,

	 	 	 
		
      then that portion of the Bonus Shares that were issued in
      connection with such Employee shall be returned by FEL to NGP for
      cancellation.

	 	 	 
	6. 	
      This Agreement is subject to the approval of the
      independent directors of NGP, and to the acceptance of the TSX Venture
      Exchange (the “Exchange”). NGP hereby agrees to seek such approval without
      delay.

	 	 	 
	7. 	
      that is within 5 business days following the date of
      Exchange acceptance to this Agreement.

	 	 	 
	8. 	
      Each of the parties hereto hereby agrees to take such
      action and execute such additional documents as may be necessary in order
      to give effect to this Agreement.

      

If the foregoing meets with your approval, please confirm your
acceptance of the terms of this Agreement by signing where indicated below and
returning the enclosed copy of this Agreement to NGP. 

Yours truly.

	 NEVADA GEOTHERMAL POWER INC. 
	 Per: 
	/s/ Gordon
      Bloomquist 
	 Independent direction 
	 Agreed to and accepted 
	 FAIRBANK ENGINEERING LTD 
	 Per: 
	 /s/ Brian D
      Fairbank 
	   Brian D. FairbankExhibit 4.93

 Exhibit 4.93

CONSULTING AGREEMENT

THIS AGREEMENT made and dated for reference the 1st
day of October, 2005.

BETWEEN:

NEVADA GEOTHERMAL POWER INC.,
of 900 - 409 
Granville Street, in the City of Vancouver, in the

Province of British Columbia V6C 1T2;

(herein called the “Company”)

     OF THE FIRST PART 

AND: 

FRANK MISSELDINE, 995
Quail Hollow Drive, 
Reno NV USA 89511; 
(herein called the
“Consultant”)

OF THE SECOND PART

WHEREAS:

The Company requires the services of a consultant and the
Consultant represents that the Consultant is qualified and desires to perform
the services required by the Company as a consultant and not as an employee.

NOW THEREFORE THE PARTIES AGREE:

The Company hereby retains the services of the Consultant upon
the following terms and conditions, which the Consultant and the Company hereby
accept, namely:

	1. 	
      The Consultant hereby agrees to provide consulting
      services with respect to those matters described in Schedule “A” attached
      hereto (the “Services”) as and when requested by the Company. The
      Consultant will also perform additional services that are requested by the
      Company from time to time, and accepted by the Consultant. 

	
	 
	2. 	
      The Consultant shall to serve as the “Development Manager
      – Geothermal” for the Company. All agreements, licenses, permits or
      contractual obligations which may be arranged or negotiated by the
      Consultant on behalf of the Company must be approved and entered into by a
      director or senior executive officer of the Company. 

	
	 
	3. 	
      The Consultant will perform the Services in an efficient,
      competent, timely and professional manner and provide the standard of
      care, skill and diligence normally

	  	 

provided by competent professionals in
the performance of services similar to those contemplated by this Agreement.

	4. 	
      The Consultant acknowledges that the Company currently
      conducts its business in Canada and the United States and the Consultant
      may be required to travel to various countries to perform the
    Services.

	 	 
	5. 	
      The appointment shall be for an initial term of one (1)
      year commencing on October 1, 2005. The Agreement may be renewed for
      further one year terms upon the mutual agreement of the parties.

	 	 
	6. 	
      The remuneration of the Consultant for the Services to be
      provided during the term of this Agreement shall be the sum of US $106,000
      per be payable in monthly instalments of US $8,833.33 on the last day of
      each month. The Consultant shall invoice the Company at the end of each
      month for the services provided under this Agreement. The Consultant shall
      also be entitled to receive stock options under the Company's Incentive
      Stock Option Plan, which shall be exercisable at a price of $0.90 per
      share for a period of up to 5 years. Upon termination of this Agreement,
      the options shall expire unless they are exercised within 90 days after
      the date of termination of this Agreement.

	 	 
	7. 	
      The Consultant shall be reimbursed for all reasonable
      travel and other expenses actually and properly incurred in connection
      with his duties hereunder and for all such expenses he shall furnish
      statements and receipts to the Chief Financial Officer of the
    Company.

	 	 
	8. 	
      The parties agree that this is a contract for the
      provision of consulting services where the Consultant is acting as an
      independent contractor, and it is not intended to create an employer and
      employee relationship.

	 	 
	9. 	
      The Consultant will be responsible for and agrees to make
      all remittances required by law with respect to taxation, unemployment
      insurance, worker's compensation, pension contributions or any other
      related matters.

	 	 
	10. 	
      The Consultant shall report to the President of the
      Company and the Project Manager/Geologist.

	 	 
	11. 	
      The Consultant shall well and faithfully serve the
      Company, and use his best efforts to promote the interests thereof, and
      shall not disclose the private affairs of the Company, or any secret of
      the Company, to any person other than the directors and officers of the
      Company, and shall not use for his own purposes, or for any purposes other
      than those of the Company, any information he may acquire with respect to
      the Company's affairs.

	 	 
	12. 	
      All information made available to the Consultant by the
      Company and all information created by the Consultant for the Company
      (collectively the “Information”) will be for the exclusive benefit of the
      Company and remain the proprietary property of the Company. The Consultant
      and his associates shall keep and ensure that all Information will remain
      confidential and will not disclose the same to any third party.
      Notwithstanding the expiry or termination of this Agreement, this
      provision will continue

      

in full force and effect until the
earlier of the date on which the Information becomes in the public domain (other
than by breach of this Agreement) or for a period of two (2) years.

	13. 	
      The Consultant and his associates shall not, during the
      term of this Agreement and for a period of two (2) years thereafter,
      acquire any interest, direct or indirect, through associates or
      affiliates, in any geothermal exploration concessions, geothermal leases,
      geothermal rights, interests in land, fee lands, surface rights or water
      rights within ten (10) kilometers of any property in which the Company has
      an interest in at the time of execution of, or acquires during the terms
      of this Agreement without the Company's prior written consent. Any
      interest acquired in violation of this paragraph will, at the Company's
      request and at no cost to the Company, be conveyed to the Company. The
      Consultant will not, during the term of this Agreement perform similar
      consulting services for any third party without the Company's prior
      written consent.

	 	 
	14. 	
      The Consultant will comply with all requirements of any
      applicable federal, state, or local law, rule or regulation. The
      Consultant covenants that he has all licenses, work permits or other
      authorizations required to enable the Consultant to perform Services under
      this agreement in the jurisdiction where the Services are to be
      performed.

	 	 
	15. 	
      The Consultant hereby specifically agrees to waive any
      claim of unemployment compensation or workers compensation and agrees not
      to make any claim for unemployment compensation or workers compensation
      against the Company, excepting only claims arising out of accidents
      resulting from the sole negligence of the Company or as permitted under
      the insurance coverage provided herein by the Company.

	 	 
	16. 	
      The Company shall have the right to terminate this
      Agreement for cause immediately, and without cause upon delivery to the
      Consultant of three (3) months notice in writing of its intention to
      terminate this agreement. Provided that the notice is delivered aforesaid,
      then upon the expiration of three (3) months this Agreement shall be
      wholly terminated. In the event the Consultant wishes to terminate this
      Agreement, he shall give the Company three (3) months notice in writing of
      his intention to terminate the Agreement, and upon the expiration of three
      (3) months from such notice this Agreement shall be wholly
    terminated,

	 	 
	17. 	
      Upon termination of this Agreement, the Consultant shall
      immediately deliver to the Company all correspondence, documents and
      papers belonging to the Company which may be in his possession or under
      his control.

	 	 
	18. 	
      On the condition that the Consultant properly performs
      his duties hereunder in good faith, the Company agrees to indemnify and
      save harmless the Consultant and his associates from and against any and
      all liability arising from the performance of the terms of this
      Agreement.

	 	 
	19. 	
      This Agreement may not be assigned by either
  party.

	 	 
	20. 	
      This Agreement embodies the entire agreement of the
      parties with respect to the matters contained herein, and supersedes all
      previous agreements between the parties. No
other

agreement, representation or warranty
shall be deemed to exist except as set forth in this Agreement. Without limiting
the generality of the foregoing this Agreement supersedes and replaces all
previous agreements between the parties or their affiliates.

	21. 	
      This Agreement shall enure to the benefit of and be
      binding on the parties hereto and their heirs, executors, administrators
      or successors.

	 	 
	22. 	
      This Agreement may only be amended by further written
      agreement executed and delivered by all of the parties or their agents.
      Except as otherwise provided, no waiver or consent by a party to any
      breach or default by any other party will be effective unless evidenced in
      writing, executed and delivered by the party so waiving or consenting and
      no waiver or consent effectively given as aforesaid will operate as a
      waiver of or consent to any further or other breach or default in relation
      to the same or any other provision of this Agreement.

	 	 
	23. 	
      The Company and the Consultant hereby confirm that they
      have been advised and given the opportunity to seek independent legal
      advice with respect to their respective rights and obligations under this
      Agreement.

	 	 
	24. 	
      If any term, covenant or condition of this Agreement or
      the application thereof to any party or circumstances is deemed to be
      invalid or unenforceable to any extent, the remainder of this Agreement or
      the application of such term, covenant or condition to a party or
      circumstances other than those to which it is held invalid or
      unenforceable will not be affected thereby and each remaining term,
      covenant or condition of this Agreement will be enforceable to the fullest
      extent permitted by law.

	 	 
	25. 	
      This Agreement shall be governed by and construed in
      accordance with the laws of the Province of British
  Columbia.

IN WITNESS WHEREOF the parties hereto have duly executed this
Agreement as of and from the date first written above.

SCHEDULE “A”

DUTIES OF THE CONSULTANT

The Consultant shall:

	1. 	
      devote 100% of his available working time to the business
      and operations of the Company and its subsidiaries on an exclusive baisis.
      The Company's standard work day is 7 'A hours between 8:30 am and 5:00
      p.m. Some evening or additional hours may be required to complete work to
      schedules. There is no provision for overtime hours;

	 	 
	2. 	
      maintain his membership in good standing with all
      professional associations in which he is currently a member;

	 	 
	3. 	
      assist in the development of a project plan, critical
      path analysis and budgeting to meet development and production
    goals;

	 	 
	4. 	
      assist in the development of a master plan
  budget;

	 	 
	5. 	
      identify lead time elements, plan and ensure timely
      execution of projects, studies and permits;

	 	 
	6. 	
      obtain environmental and project permits;

	 	 
	7. 	
      water license procurement;

	 	 
	8. 	
      transmission planning and right of way;

	 	 
	9. 	
      manage and identify contractors, engineers, costing,
      feasibility work;

	 	 
	10. 	
      develop cash flow projections;

	 	 
	11. 	
      liaise with and support drilling and reservoir
      engineers;

	 	 
	12. 	
      liaison and support for corporate management;
  and

	 	 
	13. 	
      prepare a written status report on a monthly
  basis.

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