Document:

Southwest Gas Corporation Executive Deferral Plan

 Exhibit 10.10 
 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 EXECUTIVE DEFERRAL PLAN 
 Effective
March 1, 1986 
 Amended and Restated March 1, 1988 
 Amended and Restated March 1, 1989 
 Amended and Restated March 1, 1990 
 Amended and Restated October 29, 1992 
 Amended and Restated May 10, 1994 
 Amended and Restated Effective March 1, 1999 
 Amended and Restated November 19, 2002 
 Amended and Restated Effective December 31, 2004 

 TABLE OF CONTENTS 
  

					
	 Article
	  	 Subject
	  	Page
	 1
	  	 Definitions
	  	1
			
	 2
	  	 Eligibility
	  	4
			
	 3
	  	 Deferral Commitment and Company Contribution
	  	5
			
	 4
	  	 Interest, Crediting and Vesting
	  	6
			
	 5
	  	 Plan Benefit Payments
	  	7
			
	 6
	  	 Retirement and Termination Benefit Payments
	  	7
			
	 7
	  	 Pre-Retirement Survivor Benefit Payments
	  	8
			
	 8
	  	 Post-Retirement Survivor Benefit Payments
	  	8
			
	 9
	  	 Disability Benefit Payments
	  	9
			
	 10
	  	 Beneficiaries
	  	9
			
	 11
	  	 Leave of Absence
	  	10
			
	 12
	  	 General
	  	11
			
	 13
	  	 No Guarantee of Continuing Employment
	  	11
			
	 14
	  	 Trusts
	  	12
			
	 15
	  	 Termination, Amendment or Modification of the Plan
	  	12
			
	 16
	  	 Restrictions on Alienation of Benefits
	  	13
			
	 17
	  	 Administration of the Plan
	  	13
			
	 18
	  	 Claims Procedure
	  	14
			
	 19
	  	 Miscellaneous
	  	16

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 EXECUTIVE DEFERRAL PLAN 
 PURPOSE 
 The purpose of this Plan is to provide
specified benefits to a select group of key employees who contribute materially to the continued growth, development and future business success of Southwest Gas Corporation. As amended and restated herein, this Plan document applies to Account
Balances (inclusive of earnings) maintained under the Plan as of December 31, 2004, all of which were fully earned and vested as of such date. 
 No
amendment to the Plan as in effect on October 3, 2004 that would constitute a “material modification” as defined within Internal Revenue Code (“IRC” or “Code”) Section 409A and related Treasury regulations,
shall be effective with respect to amounts that were deferred in taxable years beginning before January 1, 2005 (inclusive of any earnings on such deferred amounts). With the exception of earnings on Account Balances which may accrue on or
after January 1, 2005 as provided in Article 4 below, no further Deferrals or other contributions of any kind shall be accepted under this Plan after December 31, 2004. 
 ARTICLE 1 
 DEFINITIONS 
 For purposes hereof, unless otherwise clearly apparent from the context, the words and phrases listed below shall be defined as follows: 
  

	1.1	“Account Balance” means a Participant’s individual fund comprised of Deferrals, Company Contributions and interest earnings credited thereon up to the time of
Benefit Distribution. 

  

	1.2	“Base Annual Salary” means the yearly compensation paid to an Executive, excluding bonuses, commissions, overtime, and non-monetary awards for employment services
to the Company. 

  

	1.3	“Beneficiary” means the person, persons, entity or entities designated by the Participant to receive any benefits under the Plan upon the death of a Participant. A
Participant may designate primary and contingent Beneficiaries. 

  

	1.4	“Benefit Account Balance” shall have the meaning set forth in Article 5.3. 

  

	1.5	“Benefit Distribution” means the date benefits under the Plan commence or are paid in full to a Participant, or because of his death, to his Beneficiary, which will
occur within 90 days of notification to the Company of the event that gives rise to such distribution. 

  

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	1.6	“Board of Directors” means the Board of Directors of Southwest Gas Corporation and any Successor Corporation. 

  

	1.7	“Bonus” means the portion of actual awards, if any, paid in cash under the terms of Southwest Gas Corporation’s 1993 Management Incentive Plan, as amended
(“Management Incentive Plan”). 

  

	1.8	“Change in Control” means the first to occur of any of the following events: 

  

	 	(a)	Any “person” (as the term is used in Sections 13 and 14(d)(2) of the Securities Exchange Act of 1934 (“Exchange Act”)) who becomes a beneficial owner (as that
term is used in Section 13(d) of the Exchange Act), directly or indirectly, of 50 percent or more of the Company’s capital stock entitled to vote in the election of Directors; or 

  

	 	(b)	During any period of not more than twelve months, not including any period prior to the adoption of this Plan, individuals who, at the beginning of such period constitute the Board
of Directors of the Company, 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 clause (a) of this Article 1.8) whose election by the Board
of Directors or nomination for election by the Company’s shareholders was approved by a vote of at least 75 percent 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 approved, cease for any reason to constitute at least a majority thereof. 

  

	1.9	“Committee” means the administrative committee appointed by the Board of Directors to manage and administer the Plan in accordance with the provisions of the Plan.
After a Change in Control, the Committee shall cease to have any powers under the Plan and all powers previously vested in the Committee under the Plan will then be vested in the Third Party Fiduciary. 

  

	1.10	“Company” means Southwest Gas Corporation and such of its Subsidiaries as the Board of Directors may select to become parties to the Plan. The term
“Company” shall also include any Successor Corporation. 

  

	1.11	“Company Contributions” means the amount added, if any, to a Participant’s Account Balance in accordance with Article 3.2. 

  

	1.12	“Deferral(s)” means the amount of Base Annual Salary and Bonus transferred to the Plan accounts. No Deferrals will be accepted into this Plan after
December 31, 2004. 

  

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	1.13	“Employee” means any full-time employee of Southwest Gas Corporation as determined under the personnel policies and practices of Southwest Gas Corporation prior to
a Change in Control. 

  

	1.14	“Executive” means any officer of Southwest Gas Corporation prior to a Change in Control. 

  

	1.15	“Master Plan Document” means this legal instrument containing the provisions of the Plan. 

  

	1.16	“Moody’s Rate” means Moody’s Seasoned Corporate Bond Rate which is an economic indicator consisting of an arithmetic average of yields of representative
bonds (industrial and AAA, AA and A rated public utilities) as of January 1 prior to each Plan Year as published by Moody’s Investors Service, Inc. (or any successor thereto), or, if such index is no longer published, a substantially
similar index selected by the Board of Directors. 

  

	1.17	“Moody’s Composite Rate” means the average of the Moody’s Rate on January 1 for the five years prior to Benefit Distribution.

  

	1.18	“Participant” means any Executive who executes a Plan Agreement or an Employee who has been selected to participate in the Plan and who executes a Plan Agreement.
No new Participants will be accepted into this Plan after December 31, 2004. 

  

	1.19	“Plan” means the Executive Deferral Plan of the Company evidenced by this Master Plan Document. 

  

	1.20	“Plan Agreement” means the form of written agreement which is entered into from time to time, by and between the Company and a Participant.

  

	 1.21
	 “Plan Year” means the year beginning on March 1 of each year. 

  

	1.22	“Retire” or “Retirement” means the severance from employment with the Company on or after attaining age 55, other than by death, disability or
Termination of Employment. 

  

	1.23	“Subsidiary” means any corporation, partnership, or other organization which is at least 50 percent owned by the Company or a Subsidiary of the Company.

  

	1.24	“Successor Corporation” means any corporation or other legal entity which is the successor to Southwest Gas Corporation, whether resulting from merger,
reorganization or transfer of substantially all of the assets of Southwest Gas Corporation, regardless of whether such entity shall expressly agree to continue the Plan. 

  

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	1.25	“Terminates Employment” or “Termination of Employment” means the ceasing of employment with the Company, either voluntarily or involuntarily,
excluding Retirement, disability or death. 

  

	1.26	“Third Party Fiduciary” means an independent third party selected by the Committee to take over the administration of the Plan upon and after a Change in Control
and to determine appeals of claims denied under the Plan before and after a Change in Control pursuant to a Third Party Fiduciary Services Agreement. 

  

	1.27	“Third Party Fiduciary Services Agreement” means the agreement with the Third Party Fiduciary to perform services with respect to the Plan.

  

	1.28	“Trust Agreement” means an agreement establishing a “grantor trust” of which the Company is the grantor, within the meaning of subpart E, part I,
subchapter J, chapter 1, subtitle A of the IRC. 

  

	1.29	“Trust Fund or Funds” means the assets of every kind and description held under any Trust Agreement forming a part of the Plan. 

  

	1.30	“Trustee” means any person or entity selected by the Company to act as Trustee under any Trust Agreement at any time of reference. 

  

	1.31	“Years of Service” means a Participant’s Benefit Service as defined in the Retirement Plan for Employees of Southwest Gas Corporation, plus service with a
Successor Corporation which is not taken into account for such plan. 

 ARTICLE 2 
 ELIGIBILITY 
  

	2.1	Selection of Participants An Executive shall become eligible to participate in the Plan as of the effective date of his election by the Board of Directors as an
officer of the Company (unless the Board of Directors determines, at that time, that such Executive will not become eligible to participate in the Plan). The Committee in its sole discretion may select any other Employee to become eligible to
participate in the Plan. 

  

	2.2	Continued Eligibility If a Participant ceases to be an Executive and he continues as an Employee, the Committee in its sole discretion will determine whether such
Employee will continue to be eligible to participate in the Plan. Notwithstanding the foregoing and upon the occurrence of a Change in Control, a Participant will continue to participate in the Plan. 

  

 4 

	2.3	Participant Acceptance Once eligible to participate in the Plan, an Executive or an Employee has to complete, execute and return to the Committee a Plan Agreement to
become a Participant in the Plan. Continued participation in the Plan is subject to compliance with any further conditions as may be established by the Committee. Notwithstanding the foregoing and upon the occurrence of a Change in Control, no
additional conditions regarding continued participation in the Plan may be established by the Committee or any Successor Corporation. 

 ARTICLE 3 
 DEFERRAL COMMITMENT AND COMPANY CONTRIBUTION 
  

	3.1	Deferrals A Participant may defer up to 100 percent of his Base Annual Salary and Bonus received during a Plan Year; provided that such Deferral exceeds $2,000 per
Plan Year. Notwithstanding the foregoing, no election shall be effective to reduce the Base Annual Salary and Bonus paid to a Participant for a calendar year to an amount which is less than the amount that the Company is required to withhold from
such Participant’s Base Annual Salary and Bonus for the calendar year for (a) applicable income and employment taxes (including Federal Insurance Contributions Act tax), (b) contributions to any employee benefit plan (other than this
Plan), and (c) payroll transfers, in place, prior to such elections. 

  

	3.2	Company Matching Contributions If a Participant makes a Deferral commitment with respect to Base Annual Salary and/or Bonus, the Company will contribute an amount
equal to 50 percent of such Deferral, up to a maximum of three percent of the Participant’s Base Annual Salary, to the Participant’s Account Balance. 

  

	3.3	Timing of Deferral Election Prior to the commencement of each Plan Year, a Participant will (a) advise the Committee, in writing, of his Base Annual Salary
Deferral commitment for the upcoming Plan Year and (b) make his Deferral commitment for any Bonus earned during the calendar year ending in such Plan Year. If a Participant fails to so advise the Committee, through no fault of the Company, he
will not be permitted to defer any of his Base Annual Salary or Bonus during the upcoming Plan Year. 

  

	3.4	Exercise of Deferral Commitment A Participant’s Deferral commitment will be exercised on a per pay period basis for the portion of his Base Annual Salary that is
deferred. The exercise of a Participant’s Deferral commitment with respect to his Bonus will occur at the time the Bonus is paid. 

  

	3.5	Adjustment to Deferral Commitment The Committee reserves the right to adjust any Participant’s Deferral commitment during a Plan Year to ensure that a
Participant’s actual Deferral does not exceed the maximum allowable amount. 

  

 5 

	3.6	Deferral Elections by New Participants In the event an Executive or an Employee becomes a Participant in the Plan during a Plan Year, such Participant may defer up to
100 percent of the remaining portion of his Base Annual Salary for the current Plan Year. Such Participant must make his Deferral commitment by advising the Committee, in writing, at the time he elects to become a Participant in the Plan.

  

	3.7	Deferral Commitment Default In the event a Participant defaults on his Base Annual Salary Deferral commitment, the Participant will not be allowed to make any further
Deferrals during the current Plan Year and may not make any Deferrals for the subsequent Plan Year. In the event a Participant defaults on his Bonus Deferral commitment for a particular Plan Year, the Participant will not be able to defer any of his
Bonus for that Plan Year or the subsequent Plan Year. 

  

	3.8	Waiver of Deferral Commitment Default The Committee may waive for good cause the default penalty specified in Article 3.7 upon the request of the Participant.

  

	3.9	Deferrals after December 31, 2004 Notwithstanding any provision herein to the contrary, no Deferrals or Company matching contributions will be accepted into this
Plan after December 31, 2004, and no new Participants will be admitted hereunder after December 31, 2004. 

 ARTICLE 4 
 INTEREST, CREDITING AND VESTING 
  

	4.1	Interest Rate A Participant’s Account Balance at the start of a Plan Year and any Deferrals and Company contributions made during a Plan Year will earn, except as
provided for in Article 4.2, interest annually at 150 percent of the Moody’s Rate. Interest will be credited to a Participant’s account for Deferrals and Company contributions made during the Plan Year, as if all Deferrals and
contributions were made on the first day of the Plan Year. 

  

	4.2	Adjustment to Interest Rate If a Participant Terminates Employment prior to completing five Years of Service with the Company, interest credited for all Deferrals and
vested Company contributions to a Participant’s Account Balance will be adjusted based on the Moody’s Rate during the period he participated in the Plan. 

  

 6 

	4.3	Vesting of Company Contributions Company contributions and interest earned on such contributions will vest to a Participant at the rate of 20 percent per Year of
Service and will vest completely once a Participant has five Years of Service with the Company. 

  

	4.4	Interest Earned after December 31, 2004 Interest earned on Deferrals made on or before December 31, 2004 will be credited to the Participant’s Account
Balance in accordance with this Article 4. Any such interest is intended to be regarded as attributable to amounts deferred under the Plan as of December 31, 2004. 

 ARTICLE 5 
 PLAN BENEFIT PAYMENTS 
  

	5.1	Lump-Sum Payment A Participant’s Account Balance will be paid to the Participant in a lump-sum payment at the time of Benefit Distribution, unless the Participant
qualifies to receive benefit payments over a specific benefit payment period. 

  

	5.2	Interest prior to Benefit Distribution A Participant’s Account Balance will earn interest under the provisions of Article 4.1 or, if applicable, Article 4.2 until
the time of Benefit Distribution. 

  

	5.3	Benefit Payment Periods If a Participant is entitled to receive Plan benefit payments over a specific benefit payment period, his Account Balance at the commencement
of Benefit Distribution will be credited with an amount equal to the interest such balance would have earned assuming distribution in equal monthly installments over the specific benefit payment period, at a specified interest rate, thereby creating
a Benefit Account Balance. The Benefit Account Balance will then be paid to the Participant in equal monthly installments over the specific benefit payment period. 

  

	5.4	Payment Prior to Benefit Distribution If there shall be a final determination by the Internal Revenue Service or a court of competent jurisdiction that the election by
a Participant to defer the payment of any amount in accordance with the terms of this Plan was not effective to defer the taxation of such amount, then the Participant shall be entitled to receive a distribution of the amount determined to be
taxable and the Participant’s Account Balance shall be reduced accordingly. 

 ARTICLE 6 
 RETIREMENT AND TERMINATION BENEFIT PAYMENTS 
  

	6.1	 Benefit Payment Periods; Elections A Participant who Retires or Terminates Employment with more than five Years of Service qualifies to receive his
Account Balance over a period of 120, 180 or 240 months. The Participant shall elect the 

  

 7 

	 	 
payment period; provided that written notice of such election is filed with the Committee at least one year prior to his Retirement or Termination of
Employment. If a Participant fails to make such election prior to the time specified, the payment period will be 240 months. 

  

	6.2	Changing Elections A Participant who has made an election under this Article may subsequently revoke such election and make another election under this Article by
providing written notice to the Committee; provided, however, that only the last such election or revocation in effect on the date which is one year prior to the date on which the Participant Retires or Terminates Employment shall be effective.
Notwithstanding the foregoing, if a Participant Terminates Employment or Retires as a result of a Change in Control, the foregoing provisions of this Article 6 shall be applied by substituting “six months” for “one year.”

  

	6.3	Interest on Benefit Payments The interest rate used to calculate the amount that will be credited to a Participant’s Account Balance, to determine his Benefit
Account Balance under the provisions of Article 5.3, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 7

 PRE-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	7.1	Benefit Payments Notwithstanding any elections made pursuant to Article 6, if a Participant dies while he is an employee of the Company, his Account Balance will be
paid to his Beneficiary in equal monthly installments over the 180 month survivor benefit payment period. 

  

	7.2	Interest on Benefit Payments The interest rate used to determine the amount that will be credited to a Participant’s Account Balance, to determine his Benefit
Account Balance under the provisions of Article 5.3 following the Participant’s death, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 8 
 POST-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	8.1	Benefit Payments If a Participant dies after the commencement of Retirement, Termination of Employment or disability benefit payments under Articles 6 or 9 but prior
to such benefits having been paid in full, the Participant’s benefit payments will continue to be paid to the Participant’s Beneficiary through the end of the originally awarded benefit payment period, except as provided for in Article
10.7. 

  

 8 

 ARTICLE 9 
 DISABILITY BENEFIT PAYMENTS 
  

	9.1	Disability Determination A Participant shall be considered disabled if he qualifies for a disability benefit under the Company’s group long-term disability plan.
In the event a Participant does not qualify for benefits under the group long-term disability plan, the Committee may determine that a Participant is disabled under the provisions of the Plan. 

  

	9.2	Vesting of Company Contributions Notwithstanding the provisions of Article 4.3, Company contributions and interest earned on such contributions will be fully vested to
the Participant at the time he is determined to be disabled under this Article. 

  

	9.3	Benefit Payments During First Five Years of Service If a Participant is disabled within the first five Years of Service with the Company, he will receive his Account
Balance in a lump sum payment at Benefit Distribution. 

  

	9.4	Benefit Payments After Five Years of Service Notwithstanding any elections made pursuant to Article 6, if a Participant is disabled after five Years of Service with
the Company, his Account Balance will be paid to him in equal monthly installments over the 180 month disability payment period. 

  

	9.5	Interest on Benefit Payments If a Participant qualifies to receive his Account Balance over the disability benefit payment period, the interest rate used to calculate
the amount that will be credited to a Participant’s Account Balance, to determine his Benefit Account Balance under the provisions of Article 5.3, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 10 
 BENEFICIARIES

  

	10.1	Designation of Beneficiaries A Participant shall have the right to designate any Beneficiary to whom benefits under this Plan shall be paid in the event of the
Participant’s death prior to the total distribution of his Benefit Account Balance under the Plan. If greater than 50 percent of the Benefit Account Balance is designated to a Beneficiary other than the Participant’s spouse, such
Beneficiary designation must be consented to by the Participant’s spouse. Each Beneficiary designation must be in written form prescribed by the Committee and will be effective only when filed with the Committee during the Participant’s
lifetime. 

  

	10.2	Changing Beneficiary Designation A Participant shall have the right to change the Beneficiary designation, subject to spousal consent under the provisions of Article
10.1, without the consent of any designated Beneficiary by filing a new Beneficiary designation with the Committee. The filing of a new Beneficiary designation form will cancel all Beneficiary designations previously filed. 

 

 9 

	10.3	Acknowledgment The Committee shall acknowledge, in writing, receipt of each Beneficiary designation form. 

  

	10.4	Discharge of Company Obligation The Committee shall be entitled to rely on the Beneficiary designation last filed by the Participant prior to his death. Any payment
made in accordance with such designation shall fully discharge the Company from all further obligations with respect to the amount of such payments. 

  

	10.5	Minor or Incompetent Beneficiaries If a Beneficiary entitled to receive benefits under the Plan is a minor or a person declared incompetent, the Committee may direct
payment of such benefits to the guardian or legal representative of such minor or incompetent person. The Committee may require proof of incompetency, minority or guardianship as it may deem appropriate prior to distribution of any Plan benefits.
Such distribution shall completely discharge the Committee and the Company from all liability with respect to such payments. 

  

	10.6	Effect of No Beneficiary Designation If no Beneficiary designation is in effect at the time of the Participant’s death, or if the named Beneficiary predeceased
the Participant, then the Beneficiary shall be: (a) the surviving spouse; (b) if there is no surviving spouse, then his issue per stirpes; or (c) if no surviving spouse or issue, then his estate. 

  

	10.7	Payment to Beneficiary’s Beneficiary If a Beneficiary receiving benefit payments under the provisions of the Plan dies prior to the completion of the benefit
payment period, the present value of the remaining benefit payments will be paid, in a lump sum amount, to the Beneficiary’s Beneficiary, if any, or to the applicable estate. The present value of the remaining benefit payments will be
calculated using the same methodology, including the same interest rate, as was used to calculate the Participant’s annuity payment calculation, under Article 5.3. 

 ARTICLE 11 
 LEAVE OF ABSENCE 
  

	11.1	Continuation of Deferral Commitment If a Participant is authorized by the Company for any reason to take a paid leave of absence, the Participant’s Deferral
commitment shall remain in full force and effect. 

  

	11.2	Suspension of Deferral Commitment If a Participant is authorized by the Company for any reason to take an unpaid leave of absence, the Participant’s Deferral
commitment shall be suspended until the leave of absence ends and the Participant’s employment resumes. 

  

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 ARTICLE 12 
 GENERAL 
  

	12.1	Payment Obligation Amounts payable to a Participant or Beneficiary shall be paid from the general assets of the Company or from the assets of a grantor trust within
the meaning of subpart E, part I, subchapter J, chapter 1, subtitle A of the Code, established for use in funding executive compensation arrangements and commonly known as a “rabbi trust.” 

  

	12.2	Limitation on Payment Obligation The Company shall have no obligation under the Plan to a Participant or a Participant’s Beneficiary, except as provided in this
Master Plan Document. 

  

	12.3	Furnishing Information The Participant or Beneficiary must cooperate with the Committee in furnishing all information requested by the Company to facilitate the
payment of his Benefit Account Balance. Such information may include the results of a physical examination if any is required for participation in the Plan. 

  

	12.4	Unsecured General Creditor Participants and their Beneficiaries, heirs, successors, and assigns shall have no legal or equitable rights, claims, or interest in any
specific property or assets of the Company. No assets of the Company shall be held under any trust, or held in any way as collateral security for the fulfilling of the obligations of the Company under the Plan. Any and all of the Company’s
assets shall be, and remain, the general unpledged, unrestricted assets of the Company. The Company’s obligation under the Plan shall be merely that of an unfunded and unsecured promise of the Company to pay money in the future, and the rights
of the Participants and Beneficiaries shall be no greater than those of unsecured general creditors. It is the intention of the Company that this Plan (and the Trust Funds described in Article 14.1) be unfunded for purposes of the Code and for the
purposes of Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”). 

  

	12.5	Withholding There shall be deducted from each payment made under the Plan or other compensation payable to the Participant or Beneficiary all taxes which are required
to be withheld by the Company in respect to such payment or this Plan. The Company shall have the right to reduce any payment (or other compensation) by the amount of cash sufficient to provide the amount of said taxes. 

 ARTICLE 13 
 NO GUARANTEE OF
CONTINUING EMPLOYMENT 
  

	13.1	 Future Employment The terms and conditions of this Plan shall not be deemed to constitute a contract of employment between the Company and a
Participant. 

  

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Moreover, nothing in the Plan shall be deemed to give a Participant the right to be retained in the service of the Company or to interfere with the right of
the Company to discipline or discharge the Participant at any time. 

 ARTICLE 14 
 TRUSTS 
  

	14.1	Trusts The Company may maintain one or more Trust Funds to finance all or a portion of the benefits under the Plan by entering into one or more Trust Agreements. Any
Trust Agreement is designated as, and shall constitute, a part of the Plan, and all rights which may accrue to any person under the Plan shall be subject to all the terms and provisions of such Trust Agreement. A Trustee shall be appointed by the
Committee or the Board of Directors and shall have such powers as provided in the Trust Agreement. The Committee or the Board of Directors may modify any Trust Agreement, in accordance with its terms, to accomplish the purposes of the Plan and
appoint a successor Trustee under the provisions of such Trust Agreement. By entering into such Trust Agreement, the Committee or the Board of Directors may vest in the Trustee, or in one or more investment managers (as defined in ERISA) the power
to manage and control the Trust Fund. The Committee’s authority under the provisions of this Article 14.1 will cease upon the occurrence of a Change in Control. 

 ARTICLE 15 
 TERMINATION, AMENDMENT OR MODIFICATION OF THE PLAN 

 

	15.1	Plan Amendments The Board of Directors may, at any time, without notice, amend or modify the Plan in whole or in part; provided, however, that (a) no amendment or
modification shall be effective to decrease or restrict (i) the amount of interest to be credited to a Participant’s Account Balance under the provisions of the Plan, (ii) the benefits the Participant qualifies for or may elect to
receive under the provisions of the Plan, or (iii) benefit payments to Participants or Beneficiaries once such payments have commenced, and (b) effective March 1, 1999, no amendment or modification of this Article 15, Article 17, or
Article 18 of the Plan shall be effective except to the extent the Board of Directors deems necessary or appropriate to comply with applicable law. 

  

	15.2	Plan Termination The Board of Directors shall not terminate the Plan until all accrued benefits have been paid in full under the provisions of the Plan to the
Participants and Beneficiaries. 

  

	15.3	Partial Plan Termination The Board of Directors may partially terminate the Plan by instructing the Committee not to accept any additional Deferral commitments. In the
event of a partial termination, the remaining provisions of the Plan shall continue to operate and be effective for all Participants in the Plan, as of the date of such partial termination. 

  

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	15.4	Change of Control In the event of a hostile or non-negotiated Change of Control of the Company, the benefits of this Plan will become 100 percent vested for all
Participants and the interest credited to a Participant’s Account Balance under any provision of this Plan will be adjusted, retroactively to the date an individual became a Participant and prospectively thereafter, to 200 percent of the
Moody’s Rate. 

 ARTICLE 16 
 RESTRICTIONS ON ALIENATION OF BENEFITS 
  

	16.1	Alienation of Benefits To the maximum extent permitted by law, no interest or benefit under the Plan shall be assignable or subject in any manner to alienation, sale,
transfer, claims of creditors, pledge, attachment or encumbrances of any kind. 

 ARTICLE 17 
 ADMINISTRATION OF THE PLAN 
  

	17.1	Committee Duties Except as otherwise provided in this Article 17, and subject to Article 18, the general administration of the Plan, as well as construction and
interpretation thereof, shall be vested in the Committee. Members of the Committee may be Participants under the Plan. Specifically, the Committee shall have the discretion and authority to: (a) make, amend, interpret, and enforce all
appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretations of the Plan. Any individual serving on the Committee who is a Participant shall not vote or act on
any matter relating solely to himself or herself. The number of members of the Committee shall be established by, and the members shall be appointed from time to time by, and shall serve at the pleasure of, the Board of Directors.

  

	17.2	 Administration After a Change in Control Upon and after a Change in Control, the administration of the Plan shall be vested in a Third Party
Fiduciary, as provided for herein and pursuant to the terms of a Third Party Fiduciary Services Agreement. Any Third Party Fiduciary Services Agreement is designated as, and shall constitute, a part of the Plan. The Third Party Fiduciary shall also
have the discretion and authority to: (a) make, amend, interpret, and enforce all appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretation of the Plan
and the Trust Agreement. Except as otherwise provided for in any Trust Agreement, the Third Party Fiduciary shall have no power to direct the investment of Plan or Trust Funds or select any investment manager or custodial firm for the Plan or Trust
Agreement. The Company shall pay all reasonable administrative expenses and fees of the Third 

  

 13 

	 	 
Party Fiduciary when it acts as the administrator of the Plan or pursuant to Article 18. The Third Party Fiduciary may not be terminated by the Company
without the consent of 50 percent of the Participants in the Plan. 

  

	17.3	Agents In the administration of the Plan, the Committee or the Third Party Fiduciary, as the case may be, may from time to time employ such agents, consultants,
advisors, and managers as it deems necessary or useful in carrying out its duties as it sees fit (including acting through a duly authorized representative) and may from to time to time consult with counsel to the Company. 

 

	17.4	Binding Effect of Decisions The decision or action of the Committee or the Third Party Fiduciary, as the case may be, with respect to any question arising out of or in
connection with the administration, interpretation, and application of the Plan (and the Trust Agreement to the extent provided for in Article 17.2) and the rules and regulations promulgated hereunder shall be final and conclusive and binding upon
all persons having any interest in the Plan. 

  

	17.5	Indemnity by Company The Company shall indemnify and save harmless each member of the Committee, the Third Party Fiduciary, and any employee of the Company to whom the
duties of the Committee may be delegated against any and all claims, losses, damages, expenses, and liabilities arising from any action or failure to act with respect to the Plan, except in the case of fraud, gross negligence, or willful misconduct
by the Committee, any of its members, the Third Party Fiduciary, or any such employee. 

  

	17.6	Employer Information. To enable the Committee and the Third Party Fiduciary to perform their functions, the Company shall supply full and timely information to the
Committee and the Third Party Fiduciary, as the case may be, on all matters relating to the compensation of all Participants, their Retirement, death or other cause for Termination of Employment, and such other pertinent facts as the Committee or
the Third Party Fiduciary may require. 

  

	17.7	Manner and Timing of Benefit Payments The Committee or the Third Party Fiduciary, as the case may be, may alter, at or after Benefit Distribution, the manner and time
of payments to be made to a Participant or Beneficiary from that set forth herein, if requested to do so by such Participant or Beneficiary to meet existing financial hardships, which the Committee or the Third Party Fiduciary, as the case may be,
determine are the same as or similar in nature to those identified in Section 1.401(k)-1(d)(2)(iv) of the federal treasury regulations. 

 ARTICLE 18 
 CLAIMS PROCEDURE 
  

	18.1	 Presentation of Claims Any Participant or Beneficiary of a deceased Participant 

  

 14 

	 	 
(such Participant or Beneficiary being referred to below as a “Claimant”) may deliver to the Committee a written claim for determination with
respect to benefits available to such Claimant from the Plan. The claim must state with particularity the determination desired by the Claimant. 

  

	18.2	Notification of Decision The Committee shall consider a claim and notify the Claimant within 90 calendar days after receipt of a claim in writing:

  

	 	(a)	That the Claimant’s requested determination has been made, and that the claim has been allowed in full; or 

  

	 	(b)	That the Committee has reached a conclusion contrary, in whole or in part, to the Claimant’s requested determination, and such notice must set forth in a manner calculated to
be understood by the Claimant: (i) the specific reason(s) for the denial of the claim, or any part thereof; (ii) the specific reference(s) to pertinent provisions of the Plan upon which the denial was based; (iii) a description of any
additional material or information necessary for the Claimant to perfect the claim, and an explanation of why such material or information is necessary; and (iv) an explanation of the claim review procedure set forth in Article 18.3.

  

	18.3	Review of a Denied Claim Within 60 days after receiving a notice from the Committee that a claim has been denied, in whole or in part, a Claimant (or the
Claimant’s duly authorized representative) may file with the Third Party Fiduciary a written request for a review of the denial of the claim. Thereafter, the Claimant (or the Claimant’s duly authorized representative) may review pertinent
documents, submit written comments or other documents, and request a hearing, which the Third Party Fiduciary, in its sole discretion, may grant. 

  

	18.4	Decision on Review The Third Party Fiduciary shall render its decision on review promptly, and not later than 60 days after the filing of a written request for review
of a denial, unless a hearing is held or other special circumstances require additional time, in which case the Third Party Fiduciary’s decision must be rendered within 120 calendar days after such date. Such decision must be written in a
manner calculated to be understood by the Claimant, and it must contain: (a) the specific reason(s) for the decision; (b) the specific reference(s) to the pertinent Plan provisions upon which the decision was based; and (c) such other
matters as the Third Party Fiduciary deems relevant. 

  

	18.5	Legal Action A Claimant’s compliance with the foregoing provisions of this Article 18 is a mandatory prerequisite to a Claimant’s right to commence any legal
action with respect to any claim for benefits under the Plan. 

  

 15 

 ARTICLE 19 
 MISCELLANEOUS 
  

	19.1	Notice Any notice given under the Plan shall be in writing and shall be mailed or delivered to: 

 SOUTHWEST GAS CORPORATION 
 Executive Deferral Plan 
 Administrative Committee (LVB-283) 
 P.O. Box 98510 
 Las Vegas, NV 89193-8510 
 and 
 Wachovia Bank, N.A. 
 One West Fourth Street 
 Winston-Salem, NC 27101 
  

	19.2	Assignment The Plan shall be binding upon the Company and any of its successors and assigns, and upon a Participant, a Participant’s Beneficiary, and their
assigns, heirs, executors and administrators. 

  

	19.3	Governing Laws Except to the extent that federal law applies, the Plan shall be governed by and construed under the laws of the State of Nevada.

  

	19.4	Headings Headings in this Master Plan Document are inserted for convenience of reference only. Any conflict between such headings and the text shall be resolved in
favor of the text. 

  

	19.5	Gender and Number Masculine pronouns wherever used shall include feminine pronouns and when the context dictates, the singular shall include the plural.

  

 16 

	19.6	Effect of Illegality or Invalidity In case any provision of the Plan shall be held illegal or invalid for any reason, said illegality or invalidity shall not affect
the remaining parts hereof, but the Plan shall be construed and enforced as if such illegal and invalid provisions had never been inserted herein. 

 IN WITNESS WHEREOF, the Company has executed this Amended and Restated Master Plan Document to be effective December 31, 2004. 
  

			
	SOUTHWEST GAS CORPORATION
		
	By	 	 /s/ JEFFREY W. SHAW

		 	Jeffrey W. Shaw
		 	Chief Executive Officer
		
	Date	 	 January 14, 2008

  

 17 

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 EXECUTIVE DEFERRAL PLAN 
 Effective January 1, 2005 

 TABLE OF CONTENTS 
  

					
	 Article
	  	 Subject
	  	Page
	 1
	  	 Definitions
	  	1
			
	 2
	  	 Eligibility
	  	5
			
	 3
	  	 Participant Elections and Company Contributions
	  	5
			
	 4
	  	 Interest, Crediting and Vesting
	  	7
			
	 5
	  	 Plan Benefit Payments
	  	8
			
	 6
	  	 Pre-Retirement Survivor Benefit Payments
	  	8
			
	 7
	  	 Post-Retirement Survivor Benefit Payments
	  	8
			
	 8
	  	 Disability Benefit Payments
	  	9
			
	 9
	  	 Beneficiaries
	  	9
			
	 10
	  	 General
	  	10
			
	 11
	  	 Termination, Amendment or Modification of the Plan
	  	12
			
	 12
	  	 Administration of the Plan
	  	13
			
	 13
	  	 Claims Procedure
	  	15
			
	 14
	  	 Miscellaneous
	  	16

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 EXECUTIVE DEFERRAL PLAN 
 PURPOSE 
 The purpose of this Plan is to provide
specified benefits to a select group of key employees who contribute materially to the continued growth, development and future business success of Southwest Gas Corporation. The Plan is designed to comply with and shall be administered in a manner
consistent with the applicable requirements of Internal Revenue Code (“IRC” or “Code”) Section 409A and related Treasury regulations. This Plan document applies to any compensation first earned and deferred on or after
January 1, 2005 (inclusive of any earnings on such amounts). 
 ARTICLE 1 
 DEFINITIONS 
 For purposes hereof, unless otherwise clearly apparent from the context, the words
and phrases listed below shall be defined as follows: 
  

	1.1	“Account Balances” means a Participant’s individual fund comprised of Deferrals, Company Contributions and interest earnings credited thereon up to the
applicable Benefit Distribution Date. 

  

	1.2	“Base Annual Salary” means the yearly compensation paid to an Executive, excluding bonuses, commissions, overtime, and non-monetary awards for employment services
to the Company. 

  

	1.3	“Beneficiary” means the person, persons, entity or entities designated by the Participant to receive any benefits under the Plan upon the death of a Participant. A
participant may designate primary and contingent Beneficiaries. 

  

	1.4	“Benefit Account Balances” shall have the meaning set forth in Article 5.1. 

  

	1.5	“Benefit Distribution Date” means the date benefits under the Plan are first paid to a Participant, or because of his death, to his Beneficiary, which will occur
within 90 days of notification to the Company of the event that gives rise to such distribution. In the case of a Retirement or Termination of Employment, Benefit Distributions cannot commence until at least six months after the date of
Participant’s Retirement or Termination of Employment. 

  

 1 

	1.6	“Board of Directors” means the Board of Directors of Southwest Gas Corporation and any Successor Corporation. 

  

	1.7	“Bonus” means the portion of actual awards, if any, paid in cash under the terms of the Southwest Gas Corporation 1993 Management Incentive Plan, as amended and
restated (“Management Incentive Plan”). 

  

	1.8	“Change in Control” means the first to occur of any of the following events: 

  

	 	(a)	Any “person” (as the term is used in Sections 13 and 14(d)(2) of the Securities Exchange Act of 1934 (“Exchange Act”)) who becomes a beneficial owner (as that
term is used in Section 13(d) of the Exchange Act), directly or indirectly, of 50 percent or more of the Company’s capital stock entitled to vote in the election of Directors; or 

  

	 	(b)	During any period of not more than twelve months, not including any period prior to the adoption of this Plan, individuals who, at the beginning of such period constitute the Board
of Directors of the Company, 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 clause (a) of this Article 1.8) whose election by the Board
of Directors or nomination for election by the Company’s shareholders was approved by a vote of at least 75 percent 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 approved, cease for any reason to constitute at least a majority thereof. 

  

	1.9	“Committee” means the administrative committee appointed by the Board of Directors to manage and administer the Plan in accordance with the provisions of the Plan.
After a Change in Control, the Committee shall cease to have any powers under the Plan and all powers previously vested in the Committee under the Plan will then be vested in the Third Party Fiduciary. 

  

	1.10	“Company” means Southwest Gas Corporation and such of its Subsidiaries as the Board of Directors may select to become parties to the Plan. The term
“Company” shall also include any Successor Corporation. 

  

	1.11	“Company Contributions” means the amount added, if any, to a Participant’s Account Balance in accordance with Article 3.2. 

  

	1.12	“Deferral(s)” means the amount of Base Annual Salary and Bonus earned and deferred in accordance with the provisions of the Plan. 

  

 2 

	1.13	“Deferral Election Form” means the form of written agreement specifying deferral elections and a payout option which is completed and executed by the Participant
and submitted to the Company in a timely manner. 

  

	1.14	“Disability” means any of the following circumstances, as determined by the Committee in its sole discretion: (a) the Participant is unable to engage in any
substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve months; (b) the Participant
is, by any reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve months, receiving replacement benefits for a period of
not less than three months under an accident and health plan covering Employees of the Company; (c) the Participant is determined to be totally disabled by the Social Security Administration; or (d) the Participant becomes eligible for and
is receiving disability benefits under a long-term disability plan or program maintained by the Company, provided that the definition of “disability” applicable under such plan or program complies with the applicable requirements of the
IRC. 

  

	1.15	“Employee” means any full-time employee of Southwest Gas Corporation as determined under the personnel policies and practices of Southwest Gas Corporation prior to
a Change in Control. 

  

	1.16	“Executive” means any officer of Southwest Gas Corporation prior to a Change in Control. 

  

	1.17	“Master Plan Document” means this legal instrument containing the provisions of the Plan. 

  

	1.18	“Moody’s Rate” means Moody’s Seasoned Corporate Bond Rate which is an economic indicator consisting of an arithmetic average of yields of representative
bonds (industrial and AAA, AA and A rated public utilities) as of January 1 prior to each Plan Year as published by Moody’s Investors Service, Inc. (or any successor thereto), or, if such index is no longer published, a substantially
similar index selected by the Board of Directors. 

  

	1.19	“Moody’s Composite Rate” means the average of the Moody’s Rate on January 1 for the five years prior to the Participant’s Disability, death,
Retirement or Termination of Employment, whichever event is applicable. 

  

	1.20	“Participant” means any Executive who executes a Plan Agreement or Deferral Election Form or an Employee who has been selected to participate in the Plan and who
executes a Plan Agreement or Deferral Election Form. 

  

 3 

	1.21	“Plan” means the Executive Deferral Plan of the Company evidenced by this Master Plan Document. 

  

	1.22	“Plan Agreement” means the form of written agreement which is entered into by and between the Company and a Participant. 

  

	1.23	“Plan Year” means the annual period beginning on March 1 of each calendar year and ending on the last day of February of the following calendar year.

  

	1.24	“Retire” or “Retirement” means a Participant’s separation from service with the Company on or after attaining age 55, other than by death,
Disability or Termination of Employment. 

  

	1.25	“Subsidiary” means any corporation, partnership, or other organization which is at least 50 percent owned by the Company or a Subsidiary of the Company.

  

	1.26	“Successor Corporation” means any corporation or other legal entity which is the successor to Southwest Gas Corporation, whether resulting from merger,
reorganization or transfer of substantially all of the assets of Southwest Gas Corporation, regardless of whether such entity shall expressly agree to continue the Plan. 

  

	1.27	“Terminates Employment” or “Termination of Employment” means a Participant’s voluntary or involuntary separation from service with the
Company, excluding Retirement, Disability or death. 

  

	1.28	“Third Party Fiduciary” means an independent third party selected by the Committee to take over the administration of the Plan upon and after a Change in Control
and to determine appeals of claims denied under the Plan before and after a Change in Control pursuant to a Third Party Fiduciary Services Agreement. 

  

	1.29	“Third Party Fiduciary Services Agreement” means the agreement with the Third Party Fiduciary to perform services with respect to the Plan.

  

	1.30	“Trust Agreement” means an agreement establishing a “grantor trust” of which the Company is the grantor, within the meaning of subpart E, part I,
subchapter J, chapter 1, subtitle A of the IRC. 

  

	1.31	“Trust Fund or Funds” means the assets of every kind and description held under any Trust Agreement forming a part of the Plan. 

  

	1.32	“Trustee” means any person or entity selected by the Company to act as Trustee under any Trust Agreement at any time of reference. 

  

 4 

	1.33	“Unforeseeable Emergency” means an unforeseeable emergency as defined in the Code and related Treasury regulations. 

  

	1.34	“Years of Service” means a Participant’s Benefit Service as defined in the Retirement Plan for Employees of Southwest Gas Corporation, plus service with a
Successor Corporation which is not taken into account for such plan. 

 ARTICLE 2 
 ELIGIBILITY 
  

	2.1	Selection of Participants An Executive shall become eligible to participate in the Plan as of the effective date of his election by the Board of Directors as an
officer of the Company, unless the Board of Directors determines, at that time, that such Executive will not be eligible to participate in the Plan. The Committee in its sole discretion may select any other Employee to become eligible to participate
in the Plan. Notwithstanding the foregoing, no Executive or Employee shall be eligible to participate if he is not considered to be member of a “select group of management or highly compensated employees” as defined in the Employee
Retirement Income Security Act of 1974, as amended (“ERISA”). 

  

	2.2	Continued Eligibility If a Participant ceases to be an Executive and he continues as an Employee, the Committee in its sole discretion will determine whether such
Employee will continue to be eligible to participate in the Plan; provided, however, that any such Employee must be determined by the Committee to be a member of a “select group of management or highly compensated employees” under ERISA as
a condition of his continuing eligibility to participate in the Plan. Notwithstanding the foregoing and upon the occurrence of a Change in Control, a Participant will continue to participate in the Plan. 

  

	2.3	Commencement of Participation; Conditions to Participation Once eligible to participate in the Plan, an Executive or an Employee must complete, execute and return to
the Company a Plan Agreement in order to commence participation in the Plan. Continued participation in the Plan is subject to compliance with any further conditions as may be established by the Committee. Notwithstanding the foregoing and upon the
occurrence of a Change in Control, no additional conditions regarding continued participation in the Plan may be established by the Committee or any Successor Corporation. 

 ARTICLE 3 
 PARTICIPANT ELECTIONS AND COMPANY CONTRIBUTIONS 
  

	3.1	 Deferrals A Participant may defer up to 100 percent of his Base Annual Salary and Bonus received during a Plan Year; provided, that such Deferral
exceeds $2,000 

  

 5 

	 	 
per Plan Year. Notwithstanding the foregoing, no election shall be effective to reduce the Base Annual Salary and Bonus paid to a Participant for a calendar
year to an amount which is less than the amount that the Company is required to withhold from such Participant’s Base Annual Salary and Bonus for the calendar year for (a) any income and employment taxes (including Federal Insurance
Contributions Act tax), (b) contributions to any employee benefit plan (other than this Plan), and (c) payroll transfers, in place, prior to such elections. 

  

	3.2	Company Matching Contributions If a Participant makes a Deferral election with respect to Base Annual Salary and/or Bonus, the Company will contribute an amount equal
to 50 percent of such Deferral, up to a maximum of three percent of the Participant’s Base Annual Salary, to the Participant’s Account Balance. 

  

	3.3	Benefit Payment Periods; Irrevocable Elections A Participant shall elect the period over which the amounts deferred under such election will be distributed to him
commencing at the applicable Benefit Distribution Date. A Participant’s Account Balances shall be distributed in the form of substantially-equal installment payments over a period of 120, 180 or 240 months, as elected by the Participant in
accordance with this Article 3.3. Only one payout option is permitted for each Plan Year. However, a Participant is free to choose any available payout option for each subsequent Plan Year. If a Participant fails to make a valid election as to the
period over which his Deferrals for a particular Plan Year will be distributed, the default distribution period for such Deferrals shall be 240 months. Payout elections are irrevocable once made. 

  

	 3.4
	 Deadline for Deferral Elections By December 31st of each calendar year, a Participant must submit to the Company his completed and executed Deferral Election Form for the upcoming Plan year. If a Participant fails to timely submit
his Deferral Election Form, he will not be permitted to defer any of his Base Annual Salary or Bonus during the upcoming Plan Year. 

  

	3.5	Exercise of Deferral Election A Participant’s Deferral election will be exercised on a per pay period basis for the portion of his Base Annual Salary that is
deferred. The exercise of a Participant’s Deferral election with respect to his Bonus will occur at the time the Bonus is paid. 

  

	3.6	Deferral Elections by New Participants When an Executive or an Employee first becomes eligible to participate in the Plan, initial Deferral elections will be permitted
with respect to services performed after the elections, as long as such elections are made within 30 days after the date on which the Executive or Employee became eligible to participate in the Plan. Such Participant may defer up to 100 percent of
the remaining portion of his Base Annual Salary for the current Plan year. Such Participant must submit his Plan Agreement to the Company, in writing, at the time he elects to become a Participant in the Plan. Thereafter, in the event an Executive
or an Employee becomes a Participant in the Plan, such Participant may defer compensation only in accordance with Article 3.3. 

  

 6 

	3.7	Ineffective Elections If there shall be a final determination by the Internal Revenue Service or a court of competent jurisdiction that the election by a Participant
to defer the payment of any amount in accordance with the terms of this Plan was not effective to defer the taxation of such amount, then the Participant shall be entitled to receive a distribution of the amount determined to be taxable and the
Participant’s Account Balances shall be reduced accordingly. 

  

	3.8	Continuation of Deferral Election If a Participant is authorized by the Company for any reason to take a paid leave of absence, the Participant’s Deferral
election shall remain in full force and effect. 

  

	3.9	Suspension of Deferral Election If a Participant is authorized by the Company for any reason to take an unpaid leave of absence, the Participant’s current
Deferral election shall be terminated. 

 ARTICLE 4 
 INTEREST, CREDITING AND VESTING 
  

	4.1	Interest Rate A Participant’s Account Balances at the start of a Plan Year and any Deferrals and Company Contributions made during a Plan Year will earn, except
as provided for in Article 4.2, interest annually at 150 percent of the Moody’s Rate. Interest will be credited to a Participant’s accounts for Deferrals and Company contributions made during the Plan Year, as if all Deferrals and
contributions were made on the first day of the Plan Year. 

  

	4.2	Adjustment to Interest Rate If a Participant experiences a Termination of Employment prior to completing five Years of Service with the Company, interest credited for
all Deferrals and vested Company Contributions to a Participant’s Account Balances will be adjusted based on the Moody’s Rate during the period he participated in the Plan. 

  

	4.3	Vesting of Company Contributions Company Contributions and interest earned on such contributions will vest to a Participant at the rate of 20 percent per Year of
Service and will vest completely once a Participant has completed five Years of Service with the Company. 

  

	4.4	Interest prior to Benefit Distribution Date A Participant’s Account Balances will earn interest under the provisions of Article 4.1 or, if applicable, Article 4.2
until the applicable Benefit Distribution Date. 

  

 7 

	4.5	Interest Rate for Benefit Payment Calculation The interest rate used to calculate the amount that will be credited to a Participant’s Account Balances to
determine his Benefit Account Balances under the provisions of Article 5.1, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 5 
 PLAN BENEFIT PAYMENTS 
  

	5.1	Benefit Account Balances A Participant’s Account Balances, at the applicable Benefit Distribution Date, will be credited with an amount equal to the interest such
balances would have earned assuming distribution in equal monthly installments over the specific benefit payment periods, at a specified interest rate, thereby creating Benefit Account Balances. The Benefit Account Balances will then be paid to the
Participant in equal monthly installments over the benefit payment periods previously elected by the Participant or specified by the Plan. 

 ARTICLE 6 
 PRE-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	6.1	Pre-Retirement Death of Participant Notwithstanding any elections made pursuant to Article 3.3 if a Participant dies while he is an employee of the Company, his
Account Balances will be paid to his Beneficiary in equal monthly installments over the 180 month survivor benefit payment period commencing as of the applicable benefit commencement date. 

  

	6.2	Interest on Benefit Payments The interest rate used to determine the amount that will be credited to Participant’s Account Balances, to determine his Benefit
Account Balances under the provisions of Article 5.1 following the Participant’s death, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 7 
 POST-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	7.1	Post-Retirement Death of Participant If a Participant dies after the commencement of benefit payments under this Plan but prior to such benefits having been paid in
full, the Participant’s benefit payments will continue to be paid to the Participant’s Beneficiary through the end of the benefit payment periods previously elected by the Participant. 

  

 8 

 ARTICLE 8 
 DISABILITY BENEFIT PAYMENTS 
  

	8.1	Payment Following Disability Notwithstanding any elections made pursuant to Article 3.3, if a Participant becomes Disabled within the first five Years of Service with
the Company, he will receive his Benefit Account Balances in a lump sum payment on the applicable Benefit Distribution Date. If a Participant becomes Disabled after having completed five or more Years of Service with the Company, the Benefit Account
Balances will be paid consistent with the benefit payout periods previously elected. 

  

	8.2	Vesting of Company Contributions Notwithstanding the provisions of Article 4.3, Company contributions and interest earned on such contributions will be fully vested to
the Participant at the time he is determined to be Disabled. 

  

	8.3	Interest on Benefit Payments If a Participant qualifies to receive benefits due to a Disability, the interest rate used to calculate the amount that will be credited
to Participant’s Account Balances, to determine his Benefit Account Balances under the provisions of Article 5.1, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 9 
 BENEFICIARIES 
  

	9.1	Designation of Beneficiaries A Participant shall have the right to designate any Beneficiary to whom benefits under this Plan shall be paid in the event of the
Participant’s death prior to the total distribution of his Benefit Account Balances under the Plan. If the Participant is married and greater than 50 percent of the Benefit Account Balances is designated to a Beneficiary other than the
Participant’s spouse, such Beneficiary designation must be consented to by the Participant’s spouse. Each Beneficiary designation must be in written form prescribed by the Company and will be effective only when filed with the Company
during the Participant’s lifetime. The Company shall acknowledge, in writing, receipt of each Beneficiary designation form. 

  

	9.2	Changing Beneficiary Designation A Participant shall have the right to change the Beneficiary designation, subject to spousal consent under the provisions of Article
9.1, without the consent of any designated Beneficiary by filing a new Beneficiary designation with the Company. The filing of a new Beneficiary designation form will cancel all Beneficiary designations previously filed. 

  

	9.3	Discharge of Company Obligation Both the Company and the Committee shall be entitled to rely on the Beneficiary designation last filed by the Participant prior to his
death. Any payment made in accordance with such designation shall fully discharge the Company and the Committee from all further obligations with respect to the Participant’s rights in the Plan. 

  

 9 

	9.4	Minor or Incompetent Beneficiaries If a Beneficiary entitled to receive benefits under the Plan is a minor or a person declared incompetent, the Committee may direct
payment of such benefits to the guardian or legal representative of such minor or incompetent person. The Committee may require proof of incompetency, minority or guardianship as it may deem appropriate prior to distribution of any Plan benefits.
Such distribution shall completely discharge the Committee and the Company from all liability with respect to such payments. 

  

	9.5	Effect of No Beneficiary Designation If no Beneficiary designation is in effect at the time of the Participant’s death, or if the named Beneficiary predeceased
the Participant, then the Beneficiary shall be: (a) the surviving spouse; (b) if there is no surviving spouse, then his issue per stirpes; or (c) if no surviving spouse or issue, then his estate. 

  

	9.6	Beneficiary’s Beneficiaries If a Participant’s Beneficiary receiving benefit payments under the provisions of the Plan dies prior to the completion of the
benefit payment periods, the Participant’s benefit payments will continue to be paid through the end of the benefit payment periods previously elected by the Participant, to the Beneficiary’s Beneficiary, if any, or the applicable estate.

 ARTICLE 10 
 GENERAL 
  

	10.1	Payment Obligation Amounts payable to a Participant or Beneficiary shall be paid from the general assets of the Company or from the assets of a grantor trust within
the meaning of subpart E, part I, subchapter J, chapter 1, subtitle A of the Code, established for use in funding executive compensation arrangements and commonly known as a “rabbi trust.” 

  

	10.2	Limitation on Payment Obligation The Company shall have no obligation under the Plan to a Participant or a Participant’s Beneficiary, except as provided in this
Master Plan Document. 

  

	10.3	Furnishing Information The Participant or Beneficiary shall cooperate in furnishing all information requested by the Company to facilitate the payment of his Benefit
Account Balances. 

  

	10.4	 Unsecured General Creditor Participants and their Beneficiaries, heirs, successors, and assigns shall have no legal or equitable rights, claims, or
interest in any specific property or assets of the Company. No assets of the Company shall be 

  

 10 

	 	 
held under any trust, or held in any way as collateral security for the fulfilling of the obligations of the Company under the Plan. Any and all of the
Company assets shall be, and remain, the general unpledged, unrestricted assets of the Company. The Company obligation under the Plan shall be merely that of an unfunded and unsecured promise of the Company to pay money in the future, and the rights
of the Participants and Beneficiaries shall be no greater than those of unsecured general creditors. It is the intention of the Company that this Plan (and the Trust Funds described in Article 10.7) be unfunded for purposes of the Code and for the
purposes of Title I of ERISA. 

  

	10.5	Withholding There shall be deducted from each payment made under the Plan or other compensation payable to the Participant (or Beneficiary) all taxes which are
required to be withheld by the Company in respect to such payment under this Plan. The Company shall have the right to reduce any payment (or other compensation) by the amount of cash sufficient to provide the amount of said taxes.

  

	10.6	Future Employment The terms and conditions of this Plan shall not be deemed to constitute a contract of employment between the Company and a Participant. Moreover,
nothing in the Plan shall be deemed to give a Participant the right to be retained in the service of the Company or to interfere with the right of the Company to discipline or discharge the Participant at any time. 

  

	10.7	Trusts The Company may maintain one or more Trust Funds to finance all or a portion of the benefits under the Plan by entering into one or more Trust Agreements. Any
Trust Agreement is designated as, and shall constitute, a part of the Plan, and all rights which may accrue to any person under the Plan shall be subject to all the terms and provisions of such Trust Agreement. A Trustee shall be appointed by the
Committee or the Board of Directors and shall have such powers as provided in the Trust Agreement. The Committee or the Board of Directors may modify any Trust Agreement, in accordance with its terms, to accomplish the purposes of the Plan and
appoint a successor Trustee under the provisions of such Trust Agreement. By entering into such Trust Agreement, the Committee or the Board of Directors may vest in the Trustee, or in one or more investment managers (as defined in ERISA) the power
to manage and control the Trust Fund. Committee and the Board of Directors authority under the provisions of this Article 10.7 will cease upon the occurrence of a Change in Control. 

  

	10.8	No Assignment To the maximum extent permitted by law, no interest or benefit under the Plan shall be assignable or subject in any manner to alienation, sale, transfer,
claims of creditors, pledge, attachment or encumbrances of any kind. 

  

 11 

 ARTICLE 11 
 TERMINATION, AMENDMENT OR MODIFICATION OF THE PLAN 
  

	11.1	Plan Amendment To the extent permitted by the IRC and related regulations, the Board of Directors may, at any time, and without notice, amend or modify the Plan in
whole or in part; provided, however, that (a) no amendment or modification shall be effective to decrease or restrict (i) the amount of interest to be credited to a Participant’s Account Balances under the provisions of the Plan,
(ii) the benefits the Participant qualifies for or may elect to receive under the provisions of the Plan, or (iii) benefit payments to Participants or Beneficiaries once such payments have commenced, and (b) effective January 1,
2005, no amendment or modification of this Article 11, Article 12, or Article 13 of the Plan shall be effective except to the extent both the Committee and the Board of Directors deems necessary to comply with applicable law.

  

	11.2	Plan Termination The Board of Directors shall not terminate the Plan until all benefits owed to the Participants and Beneficiaries have been paid in full.

  

	11.3	Bankruptcy To the extent permitted under Code Section 409A and its related Treasury regulations, the Board of Directors shall have the authority, in its sole
discretion, to terminate the Plan and distribute each Participant’s Account Balances to the Participant or, if applicable, his or her Beneficiary within twelve months of a corporate dissolution taxed under Section 331 of the Code or with
the approval of a bankruptcy court pursuant to 11 U.S.C. §503(b)(1)(a) The total accelerated distribution under this Article 11.3 must be included in a Participant’s gross income in the latest of: 

  

	 	(a)	The calendar year in which the Plan is terminated; 

  

	 	(b)	The calendar year in which the Participant’s Account Balances are no longer subject to a substantial risk of forfeiture; or 

  

	 	(c)	The calendar year in which distribution of the Participant’s Account Balances is administratively practicable. 

  

	11.4	Partial Plan Termination The Board of Directors may partially terminate the Plan by instructing the Company not to accept any additional Deferral commitments. In the
event of a partial termination, the remaining provisions of the Plan shall continue to operate and be effective for all Participants in the Plan, as of the date of such partial termination. Any such instructions and any reinstatement of the Plan
shall be implemented in accordance with the IRC and related regulations. 

  

 12 

	11.5	Change in Control Notwithstanding any provisions herein to the contrary, in the event of a hostile or non-negotiated Change in Control (as determined by the Third
Party Fiduciary, in its sole discretion), the benefits of this Plan will become 100 percent vested for all Participants and the interest credited to a Participant’s Account Balances under any provision of this Plan will be adjusted,
retroactively to the date an individual became a Participant and prospectively thereafter, to 200 percent of the Moody’s Rate. 

 ARTICLE 12 
 ADMINISTRATION OF THE PLAN 
  

	12.1	Committee Duties Except as otherwise provided in this Article 12, and subject to Article 13, the general administration of the Plan, as well as construction and
interpretation thereof, shall be vested in the Committee. Members of the Committee may be Participants under the Plan. Specifically, the Committee shall have the discretion and authority to: (a) make, amend, interpret, and enforce all
appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretations of the Plan. Any individual serving on the Committee who is a Participant shall not vote or act on
any matter relating solely to himself or herself. The number of members of the Committee shall be established by, and the members shall be appointed from time to time by, and shall serve at the pleasure of, the Board of Directors.

  

	12.2	Administration After a Change in Control Upon and after a Change in Control, the administration of the Plan shall be vested in a Third Party Fiduciary, as provided for
herein and pursuant to the terms of a Third Party Fiduciary Services Agreement. Any Third Party Fiduciary Services Agreement is designated as, and shall constitute, a part of the Plan. The Third Party Fiduciary shall also have the discretion and
authority to: (a) make, amend, interpret, and enforce all appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretation of the Plan and the Trust Agreement.
Except as otherwise provided for in any Trust Agreement, the Third Party Fiduciary shall have no power to direct the investment of Plan or Trust Funds or select any investment manager or custodial firm for the Plan or Trust Agreement. The Company
shall pay all reasonable administrative expenses and fees of the Third Party Fiduciary when it acts as the administrator of the Plan or pursuant to Article 13. The Third Party Fiduciary may not be terminated by the Company without the consent of at
least 50 percent of the Participants in the Plan. 

  

	12.3	Agents In the administration of the Plan, the Committee or the Third Party Fiduciary, as the case may be, may from time to time employ such agents, consultants,
advisors, and managers as it deems necessary or useful in carrying out its duties as it sees fit (including acting through a duly authorized representative) and may from to time to time consult with counsel to the Company. 

 

 13 

	12.4	Binding Effect of Decisions The decision or action of the Committee or the Third Party Fiduciary, as the case may be, with respect to any question arising out of or in
connection with the administration, interpretation, and application of the Plan (and the Trust Agreement to the extent provided for in Article 12.2) and the rules and regulations promulgated hereunder shall be final and conclusive and binding upon
all persons or entities having any interest in the Plan. 

  

	12.5	Indemnity by Company The Company shall indemnify and save harmless each member of the Committee, the Third Party Fiduciary, and any employee of the Company to whom the
duties of the Committee may be delegated against any and all claims, losses, damages, expenses, and liabilities arising from any action or failure to act with respect to the Plan, except in the case of fraud, gross negligence, or willful misconduct
by the Committee, any of its members, the Third Party Fiduciary, or any such employee. 

  

	12.6	Cooperation – Providing Information To enable the Committee and the Third Party Fiduciary to perform their functions, the Company shall supply full and timely
information to the Committee and the Third Party Fiduciary, as the case may be, on all matters relating to the compensation of all Participants, their Retirement, death, Disability or other cause for Termination of Employment, and such other
pertinent facts as the Committee or the Third Party Fiduciary may require. 

  

	12.7	Unforeseeable Emergencies In the event of an Unforeseeable Emergency, the Committee or the Third Party Fiduciary, as the case may be, may in its sole discretion,
permit distribution to a Participant or Beneficiary from this Plan an amount no greater than the amount necessary to satisfy the Unforeseeable Emergency plus any taxes reasonably anticipated as a result of the distribution; or permit a Participant
to cancel his or her Deferral election for the applicable Plan Year in accordance with applicable Treasury regulations without an accompanying distribution from his or her Account Balances. A Participant’s current Deferral election, if any,
shall automatically terminate upon such Participant’s receipt of a withdrawal under this Article 12.7 or upon such Participant’s receipt of a “hardship distribution” (within the meaning of Code Section 401(k)(2)(B)(IV) and
the related Treasury regulations) under any of the Company tax-qualified retirement plans. To the extent such a Participant again becomes eligible to elect Deferrals in accordance with the terms of the Plan, any subsequent Deferral elections made by
the Participant must be made in accordance with the provisions of Article 3. 

  

 14 

 ARTICLE 13 
 CLAIMS PROCEDURE 
  

	13.1	Presentation of Claims Any Participant or Beneficiary of a deceased Participant (such Participant or Beneficiary being referred to below as a “Claimant”) may
deliver to the Committee a written claim for determination with respect to benefits available to such Claimant from the Plan. The claim must state with particularity the determination desired by the Claimant. 

  

	13.2	Notification of Decision The Committee shall consider a claim and notify the Claimant within 90 calendar days after receipt of a claim in writing:

  

	 	(a)	That the Claimant’s requested determination has been made, and that the claim has been allowed in full; or 

  

	 	(b)	That the Committee has reached a conclusion contrary, in whole or in part, to the Claimant’s requested determination, and such notice must set forth in a manner calculated to
be understood by the Claimant: (i) the specific reason(s) for the denial of the claim, or any part thereof; (ii) the specific reference(s) to pertinent provisions of the Plan upon which the denial was based; (iii) a description of any
additional material or information necessary for the Claimant to perfect the claim, and an explanation of why such material or information is necessary; and (iv) an explanation of the claim review procedure set forth in Article 13.3.

  

	13.3	Review of a Denied Claim Within 60 days after receiving a notice from the Committee that a claim has been denied, in whole or in part, a Claimant (or the
Claimant’s duly authorized representative) may file with the Third Party Fiduciary a written request for a review of the denial of the claim. Thereafter, the Claimant (or the Claimant’s duly authorized representative) may review pertinent
documents, submit written comments or other documents, and request a hearing, which the Third Party Fiduciary, in its sole discretion, may grant. 

  

	13.4	Decision on Review The Third Party Fiduciary shall render its decision on review promptly, and not later than 60 days after the filing of a written request for review
of a denial, unless a hearing is held or other special circumstances require additional time, in which case the Third Party Fiduciary’s decision must be rendered within 120 calendar days after such date. Such decision must be written in a
manner calculated to be understood by the Claimant, and it must contain: (a) the specific reason(s) for the decision; (b) the specific reference(s) to the pertinent Plan provisions upon which the decision was based; and (c) such other
matters as the Third Party Fiduciary deems relevant. 

  

 15 

	13.5	Legal Action A Claimant’s compliance with the foregoing provisions of this Article 18 is a mandatory prerequisite to a Claimant’s right to commence any legal
action with respect to any claim for benefits under the Plan. 

 ARTICLE 14 
 MISCELLANEOUS 
  

	14.1	Notices Any notice given under the Plan shall be in writing and shall be mailed or delivered to: 

 SOUTHWEST GAS CORPORATION 
 Executive Deferral Plan 
 Administrative Committee (LVB-283) 
 P.O. Box 98510 
 Las Vegas, NV 89193-8510 
 and 
 Wachovia Bank, N.A. 
 One West Fourth Street 
 Winston-Salem, NC 27101 
  

	14.2	Assignment The Plan shall be binding upon the Company and any of its successors and assigns, and upon a Participant, a Participant’s Beneficiary, and their
assigns, heirs, executors and administrators. 

  

	14.3	Governing Law Except to the extent that federal law applies, the Plan shall be governed by and construed under the laws of the State of Nevada.

  

	14.4	Headings Headings in this Master Plan Document are inserted for convenience of reference only. Any conflict between such headings and the text shall be resolved in
favor of the text. 

  

	14.5	Gender and Number Masculine pronouns wherever used shall include feminine pronouns and when the context dictates, the singular shall include the plural.

  

	14.6	Severability In case any provision of the Plan shall be held illegal or invalid for any reason, said illegality or invalidity shall not affect the remaining parts
hereof, but the Plan shall be construed and enforced as if such illegal and invalid provisions had never been inserted herein. 

  

 16 

 IN WITNESS WHEREOF, the Company has executed this Master Plan Document to be effective January 1, 2005. 

 

			
	SOUTHWEST GAS CORPORATION
		
	By	 	 /s/ JEFFREY W. SHAW

		 	Jeffrey W. Shaw
		 	Chief Executive Officer
		
	Date	 	 January 14, 2008

  

 17Southwest Gas Corporation Directors Deferral Plan

 Exhibit 10.11 
 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 DIRECTORS DEFERRAL PLAN 
 Effective
March 15, 1986 
 Amended and Restated March 15, 1989 
 Amended and Restated October 29, 1992 
 Amended Effective March 1, 1996 
 Amended and Restated Effective March 1, 1999 
 Amended and Restated November 19, 2002 
 Amended and Restated Effective December 31, 2004 

 TABLE OF CONTENTS 
  

					
	 Article
	  	 Subject
	  	Page
	 1
	  	Definitions	  	1
			
	 2
	  	Eligibility	  	4
			
	 3
	  	Deferral Commitment	  	4
			
	 4
	  	Interest, Crediting and Vesting	  	5
			
	 5
	  	Plan Benefit Payments	  	5
			
	 6
	  	Retirement and Termination Benefit Payments	  	6
			
	 7
	  	Pre-Retirement Survivor Benefit Payments	  	6
			
	 8
	  	Post-Retirement Survivor Benefit Payments	  	7
			
	 9
	  	Disability Benefit Payments	  	7
			
	 10
	  	Beneficiaries	  	7
			
	 11
	  	General	  	8
			
	 12
	  	No Guarantee of Continuing Directorship	  	9
			
	 13
	  	Trusts	  	9
			
	 14
	  	Termination, Amendment or Modification of the Plan	  	10
			
	 15
	  	Restrictions on Alienation of Benefits	  	10
			
	 16
	  	Administration of the Plan	  	11
			
	 17
	  	Claims Procedure	  	12
			
	 18
	  	Miscellaneous	  	13

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 DIRECTORS DEFERRAL PLAN 
 PURPOSE 
 The purpose of this Plan is to provide
specified benefits to Directors of Southwest Gas Corporation. As amended and restated herein, this Plan document applies to Account Balances (inclusive of earnings) maintained under the Plan as of December 31, 2004, all of which were fully
vested as of such date. 
 No amendment to the Plan as in effect on October 3, 2004 that would constitute a “material modification” as defined
within Internal Revenue Code (“IRC” or “Code”) 409A and related Treasury regulations shall be effective with respect to amounts that were deferred in taxable years beginning before January 1, 2005 (inclusive of any earnings
on such deferred amounts). With the exception of earnings on Account Balances which may accrue on or after January 1, 2005 as provided in Article 4 below, no further Deferrals or other contributions of any kind shall be accepted under this Plan
after December 31, 2004. 
 ARTICLE 1 
 DEFINITIONS 
 For purposes hereof, unless otherwise clearly apparent from the context, the words and phrases listed
below shall be defined as follows: 
  

	1.1	“Account Balance” means a Participant’s individual fund comprised of Deferrals, rollovers contributions from the PriMerit Bank, Federal Savings Bank Directors
deferral plan and interest earnings credited thereon up to the time of Benefit Distribution. 

  

	1.2	“Beneficiary” means the person, persons, entity or entities designated by the Participant to receive any benefits under the Plan upon the death of a Participant. A
Participant may designate primary and contingent Beneficiaries. 

  

	1.3	“Benefit Account Balance” shall have the meaning set forth in Article 5.3. 

  

	1.4	“Benefit Distribution” means the date benefits under the Plan commence or are paid in full to a Participant, or because of his death, to his Beneficiary, which will
occur within 90 days of notification to the Company of the event that gives rise to such distribution. 

  

	1.5	“Board Fees” means the compensation received by a Director for serving on the Board of Directors of Southwest Gas Corporation and the committees of the Board.

  

 1 

	1.6	“Board of Directors” means the Board of Directors of the Company. 

  

	1.7	“Change in Control” means the first to occur of any of the following events: 

  

	 	(a)	Any “person” (as the term is used in Sections 13 and 14(d)(2) of the Securities Exchange Act of 1934 (“Exchange Act”)) who becomes a beneficial owner (as that
term is used in Section 13(d) of the Exchange Act), directly or indirectly, of 50 percent or more of the Company’s capital stock entitled to vote in the election of Directors; or 

  

	 	(b)	During any period of not more than twelve months, including any period prior to the adoption of this Plan, individuals who, at the beginning of such period constitute the Board of
Directors of the Company, 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 clause (a) of this Article 1.7) whose election by the Board of
Directors or nomination for election by the Company’s shareholders was approved by a vote of at least 75 percent 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 approved, cease for any reason to constitute at least a majority thereof. 

  

	1.8	“Committee” means the administrative committee appointed by the Board of Directors to manage and administer the Plan in accordance with the provisions of the Plan.
After a Change in Control, the Committee shall cease to have any powers under the Plan and all powers previously vested in the Committee under the Plan will then be vested in the Third Party Fiduciary. 

  

	1.9	“Company” means Southwest Gas Corporation and any Successor Corporation. 

  

	1.10	“Deferral(s)” means the amount of Board Fees transferred to the Plan accounts. No Deferrals will be accepted into this Plan after December 31, 2004.

  

	1.11	“Director” means any person on the Board of Directors of Southwest Gas Corporation prior to a Change in Control. 

  

	1.12	“Master Plan Document” means this legal instrument containing the provisions of the Plan. 

  

	1.13	“Moody’s Rate” means Moody’s Seasoned Corporate Bond Rate which is an economic indicator consisting of an arithmetic average of yields of representative
bonds (industrial and AAA, AA and A rated public utilities) as of January 1 prior to each Plan Year as published by Moody’s Investors Service, Inc. (or any successor thereto), or, if such index is no longer published, a substantially
similar index selected by the Board of Directors. 

  

 2 

	1.14	“Moody’s Composite Rate” means the average of the Moody’s Rate on January 1 for the five years prior to Benefit Distribution.

  

	1.15	“Participant” means any Director who executes a Plan Agreement. No new Participants will be accepted into this Plan after December 31, 2004.

  

	1.16	“Plan” means the Directors Deferral Plan of the Company evidenced by this Master Plan Document. 

  

	1.17	“Plan Agreement” means the form of written agreement which is entered into from time to time, by and between the Company and a Participant.

  

	1.18	“Plan Year” means the year beginning on March 15 of each year. 

  

	1.19	“Retire” or “Retirement” means the cessation of service on the Board of Directors of the Company after attaining five Years of Service, other than
by death, disability or Termination of Service. 

  

	1.20	“Successor Corporation” means any corporation or other legal entity which is the successor to Southwest Gas Corporation, whether resulting from merger,
reorganization or transfer of substantially all of the assets of Southwest Gas Corporation, regardless of whether such entity shall expressly agree to continue the Plan. 

  

	1.21	“Subsidiaries” means any corporation, partnership, or other organization which is at least 50 percent owned by the Company or a Subsidiary of the Company.

  

	1.22	“Terminates Service” or “Termination of Service” means the cessation of service on the Board of Directors of the Company, either voluntarily or
involuntarily, excluding Retirement, disability or death. 

  

	1.23	“Third Party Fiduciary” means an independent third party selected by the Committee to take over the administration of the Plan upon and after a Change in Control
and to determine appeals of claims denied under the Plan before and after a Change in Control pursuant to a Third Party Fiduciary Services Agreement. 

  

	1.24	“Third Party Fiduciary Services Agreement” means the agreement with the Third Party Fiduciary to perform services with respect to the Plan.

  

	1.25	“Trust Agreement” means an agreement establishing a “grantor trust” of which the Company is the grantor, within the meaning of subpart E, part I,
subchapter J, chapter 1, subtitle A of the IRC. 

  

	1.26	“Trust Fund or Funds” means the assets of every kind and description held under any Trust Agreement forming a part of the Plan. 

  

 3 

	1.27	“Trustee” means any person or entity selected by the Company to act as Trustee under any Trust Agreement at any time of reference. 

  

	1.28	“Years of Service” means the length of time, in discrete twelve month periods, a Participant has served on the Board of Directors of Southwest Gas Corporation.

 ARTICLE 2 
 ELIGIBILITY 
  

	2.1	Selection of Participants A Director shall become eligible to participate in the Plan as of the effective date of his election as a Director. 

 

	2.2	Participant Acceptance Once eligible to participate in the Plan, a Director must complete, execute and return to the Committee a Plan Agreement to become a Participant
in the Plan. Continued participation in the Plan is subject to compliance with any further conditions as may be established by the Committee. 

 ARTICLE 3 
 DEFERRAL COMMITMENT 
  

	3.1	Deferrals A Participant may defer up to 100 percent of his Board Fees received during a Plan Year; provided that such Deferral exceeds $2,000 per Plan Year.

  

	3.2	Timing of Deferral Election Prior to the commencement of each Plan Year, a Participant will advise the Committee, in writing, of his Deferral commitment for the
upcoming Plan Year. If a Participant fails to so advise the Committee, through no fault of the Company, he will not be permitted to defer any of his Board Fees during the upcoming Plan Year. 

  

	3.3	Exercise of Deferral Commitment A Participant’s Deferral commitment will be exercised on a per pay period basis. 

  

	3.4	Deferral Elections by New Participants In the event a Director becomes a Participant in the Plan during a Plan Year, such Participant may defer up to 100 percent of
the remaining portion of his Board Fees for the Plan Year. Such Participant must make his Deferral commitment by advising the Committee, in writing, at the time he elects to become a Participant in the Plan. 

  

	3.5	Deferral Commitment Default In the event a Participant defaults on his Deferral commitment, the Participant will not be allowed to make any further Deferrals during
the current Plan Year and may not make any Deferrals for the subsequent Plan Year. 

  

	3.6	Waiver of Deferral Commitment Default The Committee may waive for good cause the default penalty specified in Article 3.5 upon the request of the Participant.

  

 4 

	3.7	Rollovers The Plan will accept rollover contributions for Participants from the PriMerit Bank, Federal Savings Bank Directors deferral plan. 

 

	3.8	Deferrals After December 31, 2004 Notwithstanding any provision herein to the contrary, no Deferrals will be accepted into this Plan after December 31, 2004,
and no new Participants will be admitted hereunder after December 31, 2004. 

 ARTICLE 4 
 INTEREST, CREDITING AND VESTING 
  

	4.1	Interest Rate A Participant’s Account Balance at the start of a Plan Year and any Deferrals made during a Plan Year and rollover contributions from the PriMerit
Bank, Federal Savings Bank Directors deferral plan will earn interest annually at 150 percent of the Moody’s Rate. Interest will be credited to a Participant’s account for Deferrals made during the Plan Year, as if all Deferrals were made
on the first day of the Plan Year. Interest will be credited to a Participant’s account for rollover contributions from the date such contributions are accepted by the Plan. 

  

	4.2	Interest Earned After December 31, 2004 Interest earned on Deferrals made on or before December 31, 2004 will be credited to the Participant’s Account
Balance in accordance with this Article 4. Any such interest is intended to be regarded as attributable to amounts deferred under the Plan as of December 31, 2004. 

 ARTICLE 5 
 PLAN BENEFIT PAYMENTS 
  

	5.1	Benefit Payments A Participant’s Account Balance will be paid to the Participant as provided for under the provisions of the Plan. 

  

	5.2	Interest Prior to Benefit Distribution A Participant’s Account Balance will earn interest under the provisions of Article 4.1 until the time of Benefit
Distribution. 

  

	5.3	Benefit Payment Periods If a Participant is entitled to receive Plan benefit payments over a specific benefit payment period, his Account Balance at the commencement
of Benefit Distribution will be credited with an amount equal to the interest such balance would have earned assuming distribution in equal monthly installments over the specific benefit payment period, at a specified interest rate, thereby creating
a Benefit Account Balance. The Benefit Account Balance will then be paid to the Participant in equal monthly installments over the specific benefit payment period. 

  

 5 

	5.4	Payment Prior to Benefit Distribution If there shall be a final determination by the Internal Revenue Service or a court of competent jurisdiction that the election by
a Participant to defer the payment of any amount in accordance with the terms of this Plan was not effective to defer the taxation of such amount, then the Participant shall be entitled to receive a distribution of the amount determined to be
taxable and the Participant’s Account Balance shall be reduced accordingly. 

 ARTICLE 6 
 RETIREMENT AND TERMINATION BENEFIT PAYMENTS 
  

	6.1	Benefit Payment Periods; Elections A Participant who Retires or Terminates Service qualifies to receive his Account Balance over a period of 60, 120, 180 or 240
months. The Participant shall elect the payment period; provided that written notice of such election is filed with the Committee at least one year prior to his Retirement or Termination of Employment. If a Participant fails to make such election
prior to the time specified, the payment period will be 240 months. 

  

	6.2	Changing Elections A Participant who has made an election under this Article may subsequently revoke such election and make another election under this Article by
providing written notice to the Committee; provided, however, that only the last such election or revocation in effect on the date which is one year prior to the date on which the Participant Retires or Terminates Service shall be effective.
Notwithstanding the foregoing, if a Participant Retires or Terminates Service as a result of a Change in Control or within one year after March 1, 1999, the date of amendment and restatement of this Plan, the foregoing provisions of this
Article 6 shall be applied by substituting “six months” for “one year.” 

  

	6.3	Interest on Benefit Payments The interest rate used to calculate the amount that will be credited to a Participant’s Account Balance, to determine his Benefit
Account Balance under the provisions of Article 5.3, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 7

 PRE-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	7.1	Benefit Payments Notwithstanding any elections made pursuant to Article 6, if a Participant dies while he is on the Board of Directors, his Account Balance will be
paid to his Beneficiary in equal monthly installments over the 180 month survivor benefit payment period. 

  

	7.2	Interest on Benefit Payments The interest rate used to determine the amount that will be credited to a Participant’s Account Balance, to determine his Benefit
Account Balance under the provisions of Article 5.3 following the Participant’s death, will be 150 percent of the Moody’s Composite Rate. 

  

 6 

 ARTICLE 8 
 POST-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	8.1	Benefit Payments If a Participant dies after the commencement of benefit payments under Articles 6 or 9 but prior to such benefits having been paid in full, the
Participant’s benefit payments will continue to be paid to the Participant’s Beneficiary through the end of the originally awarded benefit payment period, except as provided for in Article 10.7. 

 ARTICLE 9 
 DISABILITY BENEFIT
PAYMENTS 
  

	9.1	Disability Determination The Committee will, in its sole discretion, determine whether a Participant is disabled under the provisions of the Plan.

  

	9.2	Benefit Payments During First Five Years of Service If a Participant is disabled within the first five Years of Service with the Company, he will receive his Account
Balance in a lump sum payment at Benefit Distribution. 

  

	9.3	Benefit Payments After Five Years of Service Notwithstanding any elections made pursuant to Article 6, if a Participant is disabled after five Years of Service with
the Company, his Account Balance will be paid to him in equal monthly installments over the 180-month disability benefit payment period. 

  

	9.4	Interest on Benefit Payments If a Participant qualifies to receive his Account Balance over the disability benefit payment period, the interest rate used to calculate
the amount that will be credited to a Participant’s Account Balance, to determine his Benefit Account Balance under the provisions of Article 5.3, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 10 
 BENEFICIARIES

  

	10.1	Designation of Beneficiaries A Participant shall have the right to designate any person as his Beneficiary to whom benefits under this Plan shall be paid in the event
of the Participant’s death prior to the total distribution of his Benefit Account Balance under the Plan. If greater than 50 percent of the Benefit Account Balance is designated to a Beneficiary other than the Participant’s spouse, such
Beneficiary designation must be consented to by the Participant’s spouse. Each Beneficiary designation must be in written form prescribed by the Committee and will be effective only when filed with the Committee during the Participant’s
lifetime. 

  

 7 

	10.2	Changing Beneficiary Designation A Participant shall have the right to change the Beneficiary designation, subject to spousal consent under the provisions of Article
10.1, without the consent of any designated Beneficiary by filing a new Beneficiary designation with the Committee. The filing of a new Beneficiary designation form will cancel all Beneficiary designations previously filed. 

 

	10.3	Acknowledgement The Committee shall acknowledge, in writing, receipt of each Beneficiary designation form. 

  

	10.4	Discharge of Company Obligation The Committee shall be entitled to rely on the Beneficiary designation last filed by the Participant prior to his death. Any payment
made in accordance with such designation shall fully discharge the Company from all further obligations with respect to the amount of such payments. 

  

	10.5	Minor or Incompetent Beneficiaries If a Beneficiary entitled to receive benefits under the Plan is a minor or a person declared incompetent, the Committee may direct
payment of such benefits to the guardian or legal representative of such minor or incompetent person. The Committee may require proof of incompetency, minority or guardianship as it may deem appropriate prior to distribution of any Plan benefits.
Such distribution shall completely discharge the Committee and the Company from all liability with respect to such payments. 

  

	10.6	Effect of No Beneficiary Designation If no Beneficiary designation is in effect at the time of the Participant’s death, or if the named Beneficiary predeceased
the Participant, then the Beneficiary shall be: (a) the surviving spouse; (b) if there is no surviving spouse, then his issue per stirpes; or (c) if no surviving spouse or issue, then his estate. 

  

	10.7	Payment to Beneficiary’s Beneficiary If a Beneficiary receiving benefit payments under the provisions of the Plan dies prior to the completion of the benefit
payment period, the present value of the remaining benefit payments will be paid, in a lump sum amount, to the Beneficiary’s Beneficiary, if any, or to the applicable estate. The present value of the remaining benefit payments will be
calculated using the same methodology, including the same interest rate, as was used to calculate the Participant’s annuity payment calculation, under Article 5.3. 

 ARTICLE 11 
 GENERAL 
  

	11.1	Payment Obligation Amounts payable to a Participant shall be paid exclusively from the general assets of the Company or from the assets of a grantor trust within the
meaning of subpart E, part I, subchapter J, chapter 1, subtitle A of the Code, established for use in funding executive compensation arrangements and commonly known as a “rabbi trust.” 

  

 8 

	11.2	Limitation on Payment Obligation The Company shall have no obligation under the Plan to a Participant or a Participant’s Beneficiary, except as provided in this
Master Plan Document. 

  

	11.3	Furnishing Information The Participant shall cooperate with the Committee in furnishing all information requested by the Company to facilitate the payment of his
Benefit Account Balance. Such information may include the results of a physical examination if any is required for participation in the Plan. 

  

	11.4	Unsecured General Creditor Participants and their Beneficiaries, heirs, successors, and assigns shall have no legal or equitable rights, claims, or interest in any
specific property or assets of the Company. No assets of the Company shall be held under any trust, or held in any way as collateral security for the fulfilling of the obligations of the Company under the Plan. Any and all of the Company’s
assets shall be, and remain, the general unpledged, unrestricted assets of the Company. The Company’s obligation under the Plan shall be merely that of an unfunded and unsecured promise of the Company to pay money in the future, and the rights
of the Participants and Beneficiaries shall be no greater than those of unsecured general creditors. It is the intention of the Company that this Plan (and the Trust Funds described in Article 13.1) be unfunded for purposes of the Code.

  

	11.5	Withholding There shall be deducted from each payment made under the Plan or other compensation payable to the Participant (or Beneficiary) all taxes which are
required to be withheld by the Company in respect to such payment or this Plan. The Company shall have the right to reduce any payment (or other compensation) by the amount of cash sufficient to provide the amount of said taxes.

 ARTICLE 12 
 NO GUARANTEE OF CONTINUING DIRECTORSHIP 
  

	12.1	Continued Tenure The Company is without power to lawfully assure a Participant continued tenure as a Director, and nothing herein constitutes a contract of continuing
Directorship between the Company and the Participant. 

 ARTICLE 13 
 TRUSTS 
  

	13.1	 Trusts The Company may maintain one or more Trust Funds to finance all or a portion of the benefits under the Plan by entering into one or more Trust
Agreements. Any Trust Agreement is designated as, and shall constitute, a part of the Plan, and all rights which may accrue to any person under the Plan shall be subject to all the terms and provisions of such Trust Agreement. A Trustee shall be
appointed by the Committee or the Board of Directors and shall have such powers as provided in the Trust Agreement. The Committee or the Board of Directors may 

  

 9 

	 	 
modify any Trust Agreement, in accordance with its terms, to accomplish the purposes of the Plan and appoint a successor Trustee under the provisions of such
Trust Agreement. By entering into such Trust Agreement, the Committee or the Board of Directors may vest in the Trustee, or in one or more investment managers (as defined in ERISA) the power to manage and control the Trust Fund. The Committee’s
authority under the provisions of this Article 13.1 will cease upon the occurrence of a Change in Control. 

 ARTICLE 14

 TERMINATION, AMENDMENT OR MODIFICATION OF THE PLAN 
  

	14.1	Plan Amendment The Board of Directors may at any time, without notice, amend or modify the Plan in whole or in part; provided, however, that (a) no amendment
shall be effective to decrease or restrict (i) the amount of interest to be credited under the provisions of the Plan, (ii) the benefits the Participant qualifies for or may elect to receive under the provisions of the Plan, or
(iii) benefit payments to Participants or Beneficiaries once such payments have commenced, and (b) effective March 1, 1999, no amendment or modification of this Article 14, Article 16, or Article 17 of the Plan shall be effective
except to the extent the Board of Directors deems necessary or appropriate to comply with applicable law. 

  

	14.2	Plan Termination The Board of Directors shall not terminate the Plan until all accrued benefits have been paid in full under the provisions of the Plan to the
Participants and Beneficiaries. 

  

	14.3	Partial Plan Termination The Board of Directors may partially terminate the Plan by instructing the Committee not to accept any additional Deferral commitments. In the
event of a partial termination, the remaining provisions of the Plan shall continue to operate and be effective for all Participants in the Plan, as of the date of such partial termination. 

 ARTICLE 15 
 RESTRICTIONS ON
ALIENATION OF BENEFITS 
  

	15.1	Alienation of Benefits To the maximum extent permitted by law, no interest or benefit under the Plan shall be assignable or subject in any manner to alienation, sale,
transfer, claims of creditors, pledge, attachment or encumbrances of any kind. 

  

 10 

 ARTICLE 16 
 ADMINISTRATION OF THE PLAN 
  

	16.1	Committee Duties Except as otherwise provided in this Article 16, and subject to Article 17, the general administration of the Plan, as well as construction and
interpretation thereof, shall be vested in the Committee. Members of the Committee may be Participants under the Plan. Specifically, the Committee shall have the discretion and authority to: (a) make, amend, interpret, and enforce all
appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretations of the Plan. Any individual serving on the Committee who is a Participant shall not vote or act on
any matter relating solely to himself or herself. The number of members of the Committee shall be established by, and the members shall be appointed from time to time by, and shall serve at the pleasure of, the Board of Directors.

  

	16.2	Administration After a Change in Control Upon and after a Change in Control, the administration of the Plan shall be vested in a Third Party Fiduciary, as provided for
herein and pursuant to the terms of a Third Party Fiduciary Services Agreement. Any Third Party Fiduciary Services Agreement is designated as, and shall constitute, a part of the Plan. The Third Party Fiduciary shall also have the discretion and
authority to: (a) make, amend, interpret, and enforce all appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretation of the Plan and the Trust Agreement.
Except as otherwise provided for in any Trust Agreement, the Third Party Fiduciary shall have no power to direct the investment of Plan or Trust Funds or select any investment manager or custodial firm for the Plan or Trust Agreement. The Company
shall pay all reasonable administrative expenses and fees of the Third Party Fiduciary when it acts as the administrator of the Plan or pursuant to Article 17. The Third Party Fiduciary may not be terminated by the Company without the consent of 50
percent of the Participants in the Plan. 

  

	16.3	Agents In the administration of the Plan, the Committee or the Third Party Fiduciary, as the case may be, may from time to time employ such agents, consultants,
advisors, and managers as it deems necessary or useful in carrying out its duties as it sees fit (including acting through a duly authorized representative) and may from to time to time consult with counsel to the Company. 

 

	16.4	Binding Effect of Decisions The decision or action of the Committee or the Third Party Fiduciary, as the case may be, with respect to any question arising out of or in
connection with the administration, interpretation, and application of the Plan (and the Trust Agreement to the extent provided for in Article 16.2) and the rules and regulations promulgated hereunder shall be final and conclusive and binding upon
all persons having any interest in the Plan. 

  

 11 

	16.5	Indemnity by Company The Company shall indemnify and save harmless each member of the Committee, the Third Party Fiduciary, and any employee of the Company to whom the
duties of the Committee may be delegated against any and all claims, losses, damages, expenses, and liabilities arising from any action or failure to act with respect to the Plan, except in the case of fraud, gross negligence, or willful misconduct
by the Committee, any of its members, the Third Party Fiduciary, or any such employee. 

  

	16.6	Employer Information To enable the Committee and the Third Party Fiduciary to perform their functions, the Company shall supply full and timely information to the
Committee and the Third Party Fiduciary, as the case may be, on all matters relating to the compensation of all Participants, their Retirement, death or other cause for Termination of Employment, and such other pertinent facts as the Committee or
the Third Party Fiduciary may require. 

  

	16.7	Manner and Timing of Benefit Payments The Committee or the Third Party Fiduciary, as the case may be, may alter, at or after Benefit Distribution, the manner and time
of payments to be made to a Participant or Beneficiary from that set forth herein, if requested to do so by such Participant or Beneficiary to meet existing financial hardships, which the Committee or the Third Party Fiduciary, as the case may be,
determine are the same as or similar in nature to those identified in Section 1.401(k)-1(d)(2)(iv) of the federal Treasury regulations. 

 ARTICLE 17 
 CLAIMS PROCEDURE 
  

	17.1	Presentation of Claims Any Participant or Beneficiary of a deceased Participant (such Participant or Beneficiary being referred to below as a “Claimant”) may
deliver to the Committee a written claim for determination with respect to benefits available to such Claimant from the Plan. The claim must state with particularity the determination desired by the Claimant. 

  

	17.2	Notification of Decision The Committee shall consider a claim and notify the Claimant within 90 calendar days after receipt of a claim in writing:

  

	 	(a)	That the Claimant’s requested determination has been made, and that the claim has been allowed in full; or 

  

	 	(b)	That the Committee has reached a conclusion contrary, in whole or in part, to the Claimant’s requested determination, and such notice must set forth in a manner calculated to
be understood by the Claimant: (i) the specific reason(s) for the denial of the claim, or any part thereof; (ii) the specific reference(s) to pertinent provisions of the Plan upon which the denial was based; (iii) a description of any
additional material or information necessary for the Claimant to perfect the claim, and an explanation of why such material or information is necessary; and (iv) an explanation of the claim review procedure set forth in Article 17.3.

  

 12 

	17.3	Review of a Denied Claim Within 60 days after receiving a notice from the Committee that a claim has been denied, in whole or in part, a Claimant (or the
Claimant’s duly authorized representative) may file with the Third Party Fiduciary a written request for a review of the denial of the claim. Thereafter, the Claimant (or the Claimant’s duly authorized representative) may review pertinent
documents, submit written comments or other documents, and request a hearing, which the Third Party Fiduciary, in its sole discretion, may grant. 

  

	17.4	Decision on Review The Third Party Fiduciary shall render its decision on review promptly, and not later than 60 days after the filing of a written request for review
of a denial, unless a hearing is held or other special circumstances require additional time, in which case the Third Party Fiduciary’s decision must be rendered within 120 calendar days after such date. Such decision must be written in a
manner calculated to be understood by the Claimant, and it must contain: (a) the specific reason(s) for the decision; (b) the specific reference(s) to the pertinent Plan provisions upon which the decision was based; and (c) such other
matters as the Third Party Fiduciary deems relevant. 

  

	17.5	Legal Action A Claimant’s compliance with the foregoing provisions of this Article 17 is a mandatory prerequisite to a Claimant’s right to commence any legal
action with respect to any claim for benefits under the Plan. 

 ARTICLE 18 
 MISCELLANEOUS 
  

	18.1	Notice Any notice given under the Plan shall be in writing and shall be mailed or delivered to: 

 SOUTHWEST GAS CORPORATION 
 Directors Deferral Plan 
 Administrative Committee (LVB-283) 
 P.O. Box 98510 
 Las Vegas, NV 89193-8510 
 and 
 Wachovia Bank, N.A. 
 One West Fourth Street 
 Winston-Salem, NC 27101 
  

	18.2	Assignment The Plan shall be binding upon the Company and any of its successors and assigns, and upon a Participant, Participant’s Beneficiary, assigns, heirs,
executors and administrators. 

  

 13 

	18.3	Governing Laws Except to the extent that federal law applies, the Plan shall be governed by and construed under the laws of the State of Nevada.

  

	18.4	Headings Headings in this Master Plan Document are inserted for convenience of reference only. Any conflict between such headings and the text shall be resolved in
favor of the text. 

  

	18.5	Gender and Number Masculine pronouns wherever used shall include feminine pronouns and when the context dictates, the singular shall include the plural.

  

	18.6	Effect of Illegality or Invalidity In case any provision of the Plan shall be held illegal or invalid for any reason, said illegality or invalidity shall not affect
the remaining parts hereof, but the Plan shall be construed and enforced as if such illegal and invalid provisions had never been inserted herein. 

 IN WITNESS WHEREOF, the Company has executed this Amended and Restated Master Plan Document to be effective December 31, 2004. 
  

			
	SOUTHWEST GAS CORPORATION
		
	By	 	 /s/ JEFFREY W. SHAW

		 	Jeffrey W. Shaw
		 	Chief Executive Officer
		
	Date	 	 January 14, 2008

  

 14 

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 DIRECTORS DEFERRAL PLAN 
 Effective January 1, 2005 

 TABLE OF CONTENTS 
  

					
	 Article
	  	 Subject
	  	Page
	 1
	  	Definitions	  	1
			
	 2
	  	Eligibility	  	4
			
	 3
	  	Participant Elections	  	4
			
	 4
	  	Interest and Crediting	  	5
			
	 5
	  	Plan Benefit Payments	  	6
			
	 6
	  	Pre-Retirement Survivor Benefit Payments	  	6
			
	 7
	  	Post-Retirement Survivor Benefit Payments	  	6
			
	 8
	  	Disability Benefit Payments	  	6
			
	 9
	  	Beneficiaries	  	7
			
	 10
	  	General	  	8
			
	 11
	  	Termination, Amendment or Modification of the Plan	  	9
			
	 12
	  	Administration of the Plan	  	10
			
	 13
	  	Claims Procedure	  	12
			
	 14
	  	Miscellaneous	  	13

 MASTER PLAN DOCUMENT 
 SOUTHWEST GAS CORPORATION 
 DIRECTORS DEFERRAL PLAN 
 PURPOSE 
 The purpose of this Plan is to provide
specified benefits to Directors of Southwest Gas Corporation. The Plan is designed to comply with and shall be administered in a manner consistent with the applicable requirements of Internal Revenue Code (“IRC” or “Code”)
Section 409A and related Treasury regulations. This Plan document applies to any Board Fees first earned and deferred on or after January 1, 2005 (inclusive of any earnings on such amounts). 
 ARTICLE 1 
 DEFINITIONS

 For purposes hereof, unless otherwise clearly apparent from the context, the words and phrases listed below shall be defined as follows: 

 

	1.1	“Account Balances” means a Participant’s individual fund comprised of Deferrals and interest earnings credited thereon up to the applicable Benefit
Distribution Date. 

  

	1.2	“Beneficiary” means the person, persons, entity or entities designated by the Participant to receive any benefits under the Plan upon the death of a Participant. A
participant may designate primary and contingent Beneficiaries. 

  

	1.3	“Benefit Account Balances” shall have the meaning set forth in Article 5.1. 

  

	1.4	“Benefit Distribution Date” means the date benefits under the Plan are first paid to a Participant, or because of his death, to his Beneficiary, which will occur
within 90 days of notification to the Company of the event that gives rise to such distribution. 

  

	1.5	“Board Fees” means the annual retainer, meeting and committee fees received by a Director for serving on the Board of Directors and its committees.

  

	1.6	“Board of Directors” means the Board of Directors of the Company. 

  

	1.7	“Change in Control” means the first to occur of any of the following events: 

  

	 	(a)	Any “person” (as the term is used in Section 13 and 14(d)(2) of the Securities Exchange Act of 1934 (“Exchange Act”)) who becomes a beneficial owner (as
that term is used in Section 13(d) of the Exchange Act), directly or indirectly, of 50 percent or more of the Company’s capital stock entitled to vote in the election of Directors; or 

  

 1 

	 	(b)	During any period of not more than twelve months, not including any period prior to the adoption of this Plan, individuals who, at the beginning of such period constitute the Board
of Directors of the Company, 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 clause (a) of this Article 1.7) whose election by the Board
of Directors or nomination for election by the Company’s shareholders was approved by a vote of at least 75 percent 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 approved, cease for any reason to constitute at least a majority thereof. 

  

	1.8	“Committee” means the administrative committee appointed by the Board of Directors to manage and administer the Plan in accordance with the provisions of the Plan.
After a Change in Control, the Committee shall cease to have any powers under the Plan and all powers previously vested in the Committee under the Plan will then be vested in the Third Party Fiduciary. 

  

	1.9	“Company” means Southwest Gas Corporation and any Successor Corporation. 

  

	1.10	“Deferral(s)” means the amount of Board Fees earned and deferred in accordance with the provisions of the Plan. 

  

	1.11	“Director” means an outside, non-employee member of the Board of Directors prior to a Change in Control. 

  

	1.12	“Deferral Election Form” means the form of written agreement specifying deferral elections and a payout option which is completed and executed by the Participant
and submitted to the Company in a timely manner. 

  

	1.13	“Disability” means either of the following circumstances, as determined by the Committee in its sole discretion: (a) the Participant is unable to engage in any
substantial gainful activity by reason of any medically determinable physical or mental impairment which can be expected to result in death or can be expected to last for a continuous period of not less than twelve months; or (b) the
Participant is determined to be totally disabled by the Social Security Administration. 

  

	1.14	“Master Plan Document” means this legal instrument containing the provisions of the Plan. 

  

	1.15	 “Moody’s Rate” means Moody’s Seasoned Corporate Bond Rate which is an economic indicator consisting of an arithmetic average of yields of
representative bonds (industrial and AAA, AA and A rated public utilities) as of January 1 prior to 

  

 2 

	 	 
each Plan Year as published by Moody’s Investors Service, Inc. (or any successor thereto), or, if such index is no longer published, a substantially
similar index selected by the Board of Directors. 

  

	1.16	“Moody’s Composite Rate” means the average of the Moody’s Rate on January 1 for the five years prior to the Participant’s applicable Benefit
Distribution Date. 

  

	1.17	“Participant” means any Director who executes a Plan Agreement or Deferral Election Form. 

  

	1.18	“Plan” means the Directors Deferral Plan of the Company evidenced by this Master Plan Document. 

  

	1.19	“Plan Agreement” means the form of written agreement which is entered into by and between the Company and a Participant. 

  

	1.20	“Plan Year” means the annual period beginning on March 15 of each calendar year and ending on March 14 of the next following year.

  

	1.21	“Retire” or “Retirement” means the cessation of service on the Board of Directors of the Company after attaining five Years of Service, other than
by death, Disability or Termination of Service. 

  

	1.22	“Subsidiary” means any corporation, partnership, or other organization which is at least 50 percent owned by the Company or a Subsidiary of the Company.

  

	1.23	“Successor Corporation” means any corporation or other legal entity which is the successor to Southwest Gas Corporation, whether resulting from merger,
reorganization or transfer of substantially all of the assets of Southwest Gas Corporation, regardless of whether such entity shall expressly agree to continue the Plan. 

  

	1.24	“Terminates Service” or “Termination of Service” means a Participant’s voluntary or involuntary cessation of service on the Board of Directors
of the Company, for any reason except Retirement, Disability or death. 

  

	1.25	“Third Party Fiduciary” means an independent third party selected by the Committee to take over the administration of the Plan upon and after a Change in Control
and to determine appeals of claims denied under the Plan before and after a Change in Control pursuant to a Third Party Fiduciary Services Agreement. 

  

	1.26	“Third Party Fiduciary Services Agreement” means the agreement with the Third Party Fiduciary to perform services with respect to the Plan.

  

 3 

	1.27	“Trust Agreement” means an agreement establishing a “grantor trust” of which the Company is the grantor, within the meaning of subpart E, part I,
subchapter J, chapter 1, subtitle A of the IRC. 

  

	1.28	“Trust Fund or Funds” means the assets of every kind and description held under any Trust Agreement forming a part of the Plan. 

  

	1.29	“Trustee” means any person or entity selected by the Company to act as Trustee under any Trust Agreement at any time of reference. 

  

	1.30	“Unforeseeable Emergency” means an unforeseeable emergency as defined in the Code and related Treasury regulations. 

  

	1.31	“Years of Service” means the length of time, in discrete twelve month periods, a Participant has served on the Board of Directors. 

 ARTICLE 2 
 ELIGIBILITY

  

	2.1	Eligibility A Director shall become eligible to participate in the Plan as of the effective date of his election as a Director, unless the Board of Directors
determines at that time that such Director will not be eligible to participate in the Plan. 

  

	2.2	Commencement of Participation Once eligible to participate in the Plan, a Director must complete, execute and return to the Company a Plan Agreement in order to
commence participation in the Plan. Continued participation in the Plan is subject to compliance with any further conditions as may be established by the Committee. Notwithstanding the foregoing and upon the occurrence of a Change in Control, no
additional conditions regarding continued participation in the plan may be established by the Committee or any Successor Corporation. 

 ARTICLE 3 
 PARTICIPANT ELECTIONS 
  

	3.1	Deferrals A Participant may defer up to 100 percent of his Board Fees received during a Plan Year; provided that such Deferral exceeds $2,000 per Plan Year. A
Participant’s Deferral election will be exercised at the time Board Fees are paid. 

  

	3.2	 Benefit Payout Periods; Irrevocable Elections A Participant shall elect the period over which the amounts deferred under such election will be
distributed to him commencing at the applicable Benefit Distribution Date. A Participant’s Account Balances shall be distributed in the form of substantially-equal installment payments over a period of 60, 120, 180 or 240 months, as elected by
the Participant in accordance with this Article 3.2. Only one payout option is permitted for each Plan 

  

 4 

	 	 
Year. However, a Participant is free to choose any available payout option for each subsequent Plan Year. If a Participant fails to make a valid election as
to the period over which his Deferrals for a particular Plan Year will be distributed, the default distribution period for such Deferrals shall be 240 months. Payout elections are irrevocable once made. 

  

	 3.3
	 Deadline for Deferral Elections By December 31st of each calendar year, a Participant must submit to the Company his completed and executed Deferral Election Form for the upcoming Plan Year. If a Participant fails to timely submit
his Deferral Election Form, he will not be permitted to defer any of his Board Fees during the upcoming Plan Year. 

  

	3.4	Deferral Elections by New Participants When a Director first becomes eligible to participate in the Plan, initial Deferral elections will be permitted with respect to
services performed after the elections, as long as such elections are made within 30 days after the date on which the Director became eligible to participate in the Plan. Such Participant must submit his Plan Agreement to the Company, in writing, at
the time he elects to become a Participant in the Plan. Thereafter, in the event a Director becomes a Participant in the Plan, such Participant may defer Board Fees only in accordance with Article 3.2. 

  

	3.5	Ineffective Elections If there shall be a final determination by the Internal Revenue Service or a court of competent jurisdiction that the election by a Participant
to defer the payment of any amount in accordance with the terms of this Plan was not effective to defer the taxation of such amount, then the Participant shall be entitled to receive a distribution of the amount determined to be taxable and the
Participant’s Account Balances shall be reduced accordingly. 

 ARTICLE 4 
 INTEREST AND CREDITING 
  

	4.1	Interest Rate A Participant’s Account Balances at the start of a Plan Year and any Deferrals made during a Plan Year will earn interest annually at 150 percent of
the Moody’s Rate. Interest will be credited to a Participant’s accounts for Deferrals made during the Plan Year, as if all Deferrals were made on the first day of the Plan Year. 

  

	4.2	Interest Prior to Benefit Distribution Date A Participant’s Account Balance will earn interest under the provisions of Article 4.1 until the applicable Benefit
Distribution Date. 

  

	4.3	Interest Rate for Benefit Payment Calculation The interest rate used to calculate the amount that will be credited to Participant’s Account Balances, to determine
his Benefit Account Balances under the provisions of Article 5.1, will be 150 percent of the Moody’s Composite Rate. 

  

 5 

 ARTICLE 5 
 PLAN BENEFIT PAYMENTS 
  

	5.1	Benefit Account Balances A Participant’s Account Balances, at the applicable Benefit Distribution Date, will be credited with an amount equal to the interest such
balances would have earned assuming distribution in equal monthly installments over the specific benefit payment periods, at a specified interest rate, thereby creating Benefit Account Balances. The Benefit Account Balances will then be paid to the
Participant in equal monthly installments over the benefit payment periods previously elected by the Participant or specified by the Plan. 

 ARTICLE 6 
 PRE-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	6.1	Pre-Retirement Death of Participant Notwithstanding any elections made pursuant to Article 3.2, if a Participant dies while he is a member of the Board of Directors,
his Account Balances will be paid to his Beneficiary in equal monthly installments over the 180 month survivor benefit payment period commencing as of the applicable Benefit Distribution Date. 

  

	6.2	Interest on Benefit Payments The interest rate used to determine the amount that will be credited to Participant’s Account Balances, to determine his Benefit
Account Balances under the provisions of Article 5.1 following the Participant’s death, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 7 
 POST-RETIREMENT SURVIVOR BENEFIT PAYMENTS 
  

	7.1	Post-Retirement Death of Participant If a Participant dies after the commencement of benefit payments under this Plan but prior to such benefits having been paid in
full, the Participant’s benefit payments will continue to be paid to the Participant’s Beneficiary through the end of the benefit payment periods previously elected by the Participant. 

 ARTICLE 8 
 DISABILITY BENEFIT
PAYMENTS 
  

	8.1	Payment Following Disability Notwithstanding any elections made pursuant to Article 3.2, if a Participant becomes Disabled within the first five Years of Service with
the Company, he will receive his Benefit Account Balances in a lump sum payment on the applicable Benefit Distribution Date. If a Participant becomes Disabled after having completed five or more Years of Service with the Company, the Benefit Account
Balances will be paid consistent with the benefit payout periods previously elected. 

  

 6 

	8.2	Interest on Benefit Payments If a Participant qualifies to receive benefits due to a Disability, the interest rate used to calculate the amount that will be credited
to Participant’s Account Balances, to determine his Benefit Account Balances under the provisions of Article 5.1, will be 150 percent of the Moody’s Composite Rate. 

 ARTICLE 9 
 BENEFICIARIES 
  

	9.1	Designation of Beneficiaries A Participant shall have the right to designate any Beneficiary to whom benefits under this Plan shall be paid in the event of the
Participant’s death prior to the total distribution of his Benefit Account Balances under the Plan. If the Participant is married and greater than 50 percent of the Benefit Account Balances is designated to a Beneficiary other than the
Participant’s spouse, such Beneficiary designation must be consented to by the Participant’s spouse. Each Beneficiary designation must be in written form prescribed by the Company and will be effective only when filed with the Company
during the Participant’s lifetime. The Company shall acknowledge, in writing, receipt of each Beneficiary designation form. 

  

	9.2	Changing Beneficiary Designation A Participant shall have the right to change the Beneficiary designation, subject to spousal consent under the provisions of Article
10.1, without the consent of any designated Beneficiary by filing a new Beneficiary designation with the Company. The filing of a new Beneficiary designation form will cancel all Beneficiary designations previously filed. 

 

	9.3	Discharge of Company Obligation Both the Company and the Committee shall be entitled to rely on the Beneficiary designation last filed by the Participant prior to his
death. Any payment made in accordance with such designation shall fully discharge the Company and the Committee from all further obligations with respect to the Participant’s rights in the Plan. 

  

	9.4	Minor or Incompetent Beneficiaries If a Beneficiary entitled to receive benefits under the Plan is a minor or a person declared incompetent, the Committee may direct
payment of such benefits to the guardian or legal representative of such minor or incompetent person. The Committee may require proof of incompetency, minority or guardianship as it may deem appropriate prior to distribution of any Plan benefits.
Such distribution shall completely discharge the Committee and the Company from all liability with respect to such payments. 

  

	9.5	Effect of No Beneficiary Designation If no Beneficiary designation is in effect at the time of the Participant’s death, or if the named Beneficiary predeceased
the Participant, then the Beneficiary shall be: (a) the surviving spouse; (b) if there is no surviving spouse, then his issue per stirpes; or (c) if no surviving spouse or issue, then his estate. 

  

 7 

	9.6	Beneficiary’s Beneficiaries If a Participant’s Beneficiary receiving benefit payments under the provisions of the Plan dies prior to the completion of the
benefit payment periods, the Participant’s benefit payments will continue to be paid through the end of the benefit payment periods previously elected by the Participant, to the Beneficiary’s Beneficiary, if any, or the applicable estate.

 ARTICLE 10 
 GENERAL 
  

	10.1	Payment Obligation Amounts payable to a Participant or Beneficiary shall be paid exclusively from the general assets of the Company or from the assets of a grantor
trust within the meaning of subpart E, part I, subchapter J, chapter 1, subtitle A of the Code, established for use in funding executive compensation arrangements and commonly known as a “rabbi trust.” 

  

	10.2	Limitation or Payment Obligation The Company shall have no obligation under the Plan to a Participant or a Participant’s Beneficiary, except as provided in this
Master Plan Document. 

  

	10.3	Furnishing Information The Participant or Beneficiary shall cooperate in furnishing all information requested by the Company to facilitate the payment of his Benefit
Account Balances. 

  

	10.4	Unsecured General Creditor Participants and their Beneficiaries, heirs, successors, and assigns shall have no legal or equitable rights, claims, or interest in any
specific property or assets of the Company. No assets of the Company shall be held under any trust, or held in any way as collateral security for the fulfilling of the obligations of the Company under the Plan. Any and all of the Company assets
shall be, and remain, the general unpledged, unrestricted assets of the Company. The Company obligation under the Plan shall be merely that of an unfunded and unsecured promise of the Company to pay money in the future, and the rights of the
Participants and Beneficiaries shall be no greater than those of unsecured general creditors. It is the intention of the Company that this Plan (and the Trust Funds described in Article 10.7) be unfunded for purposes of the Code.

  

	10.5	Withholding There shall be deducted from each payment made under the Plan or other compensation payable to the Participant (or Beneficiary) all taxes which are
required to be withheld by the Company in respect to such payment under this Plan. The Company shall have the right to reduce any payment (or other compensation) by the amount of cash sufficient to provide the amount of said taxes.

  

 8 

	10.6	Continued Tenure The Company is without power to lawfully assure a Participant continued tenure as a Director, and nothing herein constitutes a contract of continuing
Directorship between the Company and the Participant. 

  

	10.7	Trusts The Company may maintain one or more Trust Funds to finance all or a portion of the benefits under the Plan by entering into one or more Trust Agreements. Any
Trust Agreement is designated as, and shall constitute, a part of the Plan, and all rights which may accrue to any person under the Plan shall be subject to all the terms and provisions of such Trust Agreement. A Trustee shall be appointed by the
Committee or the Board of Directors and shall have such powers as provided in the Trust Agreement. The Committee or the Board of Directors may modify any Trust Agreement, in accordance with its terms, to accomplish the purposes of the Plan and
appoint a successor Trustee under the provisions of such Trust Agreement. By entering into such Trust Agreement, the Committee or the Board of Directors may vest in the Trustee, or in one or more investment managers (as defined in ERISA) the power
to manage and control the Trust Fund. Committee authority under the provisions of this Article 10.7 will cease upon the occurrence of a Change in Control. 

  

	10.8	No Assignment To the maximum extent permitted by law, no interest or benefit under the Plan shall be assignable or subject in any manner to alienation, sale, transfer,
claims of creditors, pledge, attachment or encumbrances of any kind. 

 ARTICLE 11 
 TERMINATION, AMENDMENT OR MODIFICATION OF THE PLAN 
  

	11.1	Plan Amendment To the extent permitted by the IRC and related regulations, the Board of Directors may at any time, and without notice, amend or modify the Plan in
whole or in part; provided, however, that (a) no amendment or modification shall be effective to decrease or restrict (i) the amount of interest to be credited to a Participant’s Account Balances under the provisions of the Plan,
(ii) the benefits the Participant qualifies for or may elect to receive under the provisions of the Plan, or (iii) benefit payments to Participants or Beneficiaries once such payments have commenced, and (b) effective January 1,
2005, no amendment or modification of this Article 11, Article 12, or Article 13 of the Plan shall be effective except to the extent both the Committee and the Board of Directors deems necessary to comply with applicable law.

  

	11.2	Plan Termination The Board of Directors shall not terminate the Plan until all benefits owed to the Participants and Beneficiaries have been paid in full.

  

	11.3	 Bankruptcy To the extent permitted under code Section 409A and related Treasury regulations, the Board of Directors shall have the authority, in
its sole discretion, to terminate the Plan and distribute each Participant’s Account Balances to the Participant or, if applicable, his or her Beneficiary within twelve months of a 

  

 9 

	 	 
corporate dissolution taxed under Section 331 of the Code or with the approval of a bankruptcy court pursuant to 11 U.S.C. § 503(b)(1)(a). The
total accelerated distribution under this Article 11.3 must be included in a Participant’s gross income in the latest of: 

  

	 	(a)	The calendar year in which the Plan is terminated; 

  

	 	(b)	The calendar year in which the Participant’s Account Balances are no longer subject to a substantial risk of forfeiture; or 

  

	 	(c)	The calendar year in which distribution of the Participant’s Account Balances is administratively practicable. 

  

	11.4	Partial Plan Termination The Board of Directors may partially terminate the Plan by instructing the Company not to accept any additional Deferral commitments. In the
event of a partial termination, the remaining provisions of the Plan shall continue to operate and be effective for all Participants in the Plan, as of the date of such partial termination. Any such instructions and any reinstatement of the Plan
shall be implemented in accordance with the IRC and related regulations. 

 ARTICLE 12 
 ADMINISTRATION OF THE PLAN 
  

	12.1	Committee Duties Except as otherwise provided in this Article 12, and subject to Article 13, the general administration of the Plan, as well as construction and
interpretation thereof, shall be vested in the Committee. Members of the Committee may be Participants under the Plan. Specifically, the Committee shall have the discretion and authority to: (a) make, amend, interpret, and enforce all
appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretations of the Plan. Any individual serving on the Committee who is a Participant shall not vote or act on
any matter relating solely to himself or herself. The number of members of the Committee shall be established by, and the members shall be appointed from time to time by, and shall serve at the pleasure of, the Board of Directors.

  

	12.2	 Administration after a Change in Control Upon and after a Change in Control, the administration of the Plan shall be vested in a Third Party
Fiduciary, as provided for herein and pursuant to the terms of a Third Party Fiduciary Services Agreement. Any Third Party Fiduciary Services Agreement is designated as, and shall constitute, a part of the Plan. The Third Party Fiduciary shall also
have the discretion and authority to: (a) make, amend, interpret, and enforce all appropriate rules and regulations for the administration of the Plan; and (b) decide or resolve any and all questions including interpretation of the Plan
and the Trust Agreement. Except as otherwise provided for in any Trust Agreement, the Third Party Fiduciary shall have no power to direct the investment of Plan or Trust Funds or select any 

  

 10 

	 	 
investment manager or custodial firm for the Plan or Trust Agreement. The Company shall pay all reasonable administrative expenses and fees of the Third
Party Fiduciary when it acts as the administrator of the Plan or pursuant to Article 13. The Third Party Fiduciary may not be terminated by the Company without the consent of at least 50 percent of the Participants in the Plan.

  

	12.3	Agents In the administration of the Plan, the Committee or the Third Party Fiduciary, as the case may be, may from time to time employ such agents, consultants,
advisors, and managers as it deems necessary or useful in carrying out its duties as it sees fit (including acting through a duly authorized representative) and may from to time to time consult with counsel to the Company. 

 

	12.4	Binding Effects of Decisions The decision or action of the Committee or the Third Party Fiduciary, as the case may be, with respect to any question arising out of or
in connection with the administration, interpretation, and application of the Plan (and the Trust Agreement to the extent provided for in Article 12.2) and the rules and regulations promulgated hereunder shall be final and conclusive and binding
upon all persons or entities having any interest in the Plan. 

  

	12.5	Indemnity by Company The Company shall indemnify and save harmless each member of the Committee, the Third Party Fiduciary, and any employee of the Company to whom the
duties of the Committee may be delegated against any and all claims, losses, damages, expenses, and liabilities arising from any action or failure to act with respect to the Plan, except in the case of fraud, gross negligence, or willful misconduct
by the Committee, any of its members, the Third Party Fiduciary, or any such employee. 

  

	12.6	Cooperation – Providing Information To enable the Committee and the Third Party Fiduciary to perform their functions, the Company shall supply full and timely
information to the Committee and the Third Party Fiduciary, as the case may be, on all matters relating to the compensation of all Participants, their Retirement, death or other cause for Termination of Service, and such other pertinent facts as the
Committee or the Third Party Fiduciary may require. 

  

	12.7	Unforeseeable Emergencies In the event of an Unforeseeable Emergency, the Committee or the Third Party Fiduciary, as the case may be, may in its sole discretion,
permit distribution to a Participant or Beneficiary from this Plan an amount no greater than the amount necessary to satisfy the Unforeseeable Emergency plus any taxes reasonably anticipated as a result of the distribution; or permit a Participant
to cancel his or her Deferral election for the applicable Plan Year in accordance with applicable Treasury regulations without an accompanying distribution from his or her Account Balances. A Participant’s current Deferral election, if any,
shall automatically terminate upon such Participant’s receipt of a withdrawal under this Article 12.7. To the extent such a Participant again becomes eligible to elect Deferrals in accordance with the terms of the Plan, any subsequent Deferral
elections made by the Participant must be made in accordance with the provisions of Article 3. 

  

 11 

 ARTICLE 13 
 CLAIMS PROCEDURE 
  

	13.1	Presentation of Claims Any Participant or Beneficiary of a deceased Participant (such Participant or Beneficiary being referred to below as a “Claimant”) may
deliver to the Committee a written claim for determination with respect to benefits available to such Claimant from the Plan. The claim must state with particularity the determination desired by the Claimant. 

  

	13.2	Notification of Decision The Committee shall consider a claim and notify the Claimant within 90 calendar days after receipt of a claim in writing:

  

	 	(a)	That the Claimant’s requested determination has been made, and that the claim has been allowed in full; or 

  

	 	(b)	That the Committee has reached a conclusion contrary, in whole or in part, to the Claimant’s requested determination, and such notice must set forth in a manner calculated to
be understood by the Claimant: (i) the specific reason(s) for the denial of the claim, or any part thereof; (ii) the specific reference(s) to pertinent provisions of the Plan upon which the denial was based; (iii) a description of any
additional material or information necessary for the Claimant to perfect the claim, and an explanation of why such material or information is necessary; and (iv) an explanation of the claim review procedure set forth in Article 13.3.

  

	13.3	Review of a Denied Claim Within 60 days after receiving a notice from the Committee that a claim has been denied, in whole or in part, a Claimant (or the
Claimant’s duly authorized representative) may file with the Third Party Fiduciary a written request for a review of the denial of the claim. Thereafter, the Claimant (or the Claimant’s duly authorized representative) may review pertinent
documents, submit written comments or other documents, and request a hearing, which the Third Party Fiduciary, in its sole discretion, may grant. 

  

	13.4	Decision on Review The Third Party Fiduciary shall render its decision on review promptly, and not later than 60 days after the filing of a written request for review
of a denial, unless a hearing is held or other special circumstances require additional time, in which case the Third Party Fiduciary’s decision must be rendered within 120 calendar days after such date. Such decision must be written in a
manner calculated to be understood by the Claimant, and it must contain: (a) the specific reason(s) for the decision; (b) the specific reference(s) to the pertinent Plan provisions upon which the decision was based; and (c) such other
matters as the Third Party Fiduciary deems relevant. 

  

 12 

	13.5	Legal Action A Claimant’s compliance with the foregoing provisions of this Article 13 is a mandatory prerequisite to a Claimant’s right to commence any legal
action with respect to any claim for benefits under the Plan. 

 ARTICLE 14 
 MISCELLANEOUS 
  

	14.1	Notices Any notice given under the Plan shall be in writing and shall be mailed or delivered to: 

 SOUTHWEST GAS CORPORATION 
 Directors Deferral Plan 
 Administrative Committee (LVB-283) 
 P. O. Box 98510 
 Las Vegas, NV 89193-8510 
 and 
 Wachovia Bank, N.A. 
 One West Fourth Street 
 Winston-Salem, NC 27101 
  

	14.2	Assignment The Plan shall be binding upon the Company and any of its successors and assigns, and upon a Participant, a Participant’s Beneficiary, and their
assigns, heirs, executors and administrators. 

  

	14.3	Governing Law Except to the extent that federal law applies, the Plan shall be governed by and construed under the laws of the State of Nevada.

  

	14.4	Headings Headings in this Master Plan Document are inserted for convenience of reference only. Any conflict between such headings and the text shall be resolved in
favor of the text. 

  

	14.5	Gender and Number Masculine pronouns wherever used shall include feminine pronouns and when the context dictates, the singular shall include the plural.

  

	14.6	Severability In case any provision of the Plan shall be held illegal or invalid for any reason, said illegality or invalidity shall not affect the remaining parts
hereof, but the Plan shall be construed and enforced as if such illegal and invalid provisions had never been inserted herein. 

  

 13 

 IN WITNESS WHEREOF, the Company has executed this Master Plan Document to be effective January 1, 2005. 

 

			
	SOUTHWEST GAS CORPORATION
		
	By	 	 /s/ JEFFREY W. SHAW

		 	Jeffrey W. Shaw
		 	Chief Executive Officer
		
	Date	 	 January 14, 2008

  

 14

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