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/s/ Randall K. Edington 12/21/06




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Attachment A
 
    
    Annual base salary of $600,000.
    
    Hiring bonus of $200,000 (gross) payable during your first two weeks of employment. In
addition, subsequent bonuses of $100,000 (gross) will be paid to you on your employment
anniversary dates in 2008 and 2009 if you are then employed by the Company. We will
document this obligation in a supplemental agreement in order to comply with the new tax
rules on deferred compensation arrangements.
    
    Participation in the annual Incentive Plan with a target of 50% and up to a maximum of
100% of annual base salary. Annual incentive payments are dependent on Company and Plant
performance and are generally paid by March 15 of the subsequent year.
    
    As of the date on which you accept this offer, you will be awarded 10,000 Retention
Units (RU). The Retention Units vest over a four year period. The first 25% of this
award will vest and be payable in cash on your start date. The remaining 75% will vest
and be paid 25% each in the three subsequent years in the month of January. Each
Retention Unit represents the right to receive a payment equal in value to one share of
Pinnacle West stock. The value of the payments will vary with the value of the stock.
Attached as Attachment B is a more complete explanation of the Retention Unit concept.
The terms of the Retention Units will be addressed in a separate Retention Unit Award that
will comply with the new deferred compensation tax rules.
    
    In addition, annually you will receive a long term performance award that will be made
by our Human Resources Committee of the Board pursuant to our long-term incentive
programs. We anticipate that these awards will consist of a mixture of Performance Shares
and Restricted Stock Units.
    
    Your first grant of Performance Shares will be in the amount of $125,000.
    
    If you are employed by APS on the dates on which your existing unvested Entergy
Performance Shares and Stock Option grants would have vested, APS will make a cash payment
to you for the value of such stock grants. We will need to document this obligation in a
supplemental agreement that complies with new deferred compensation tax rules.
    
    Your total pension benefit (including the benefit due under our qualified plan, our
general non-qualified plan and a special agreement that we will prepare for you) will be
the greater of: a) equal to your total pension benefit if you had stayed at Entergy for
five more years (exact value to be agreed upon once you provide pension estimates from
Entergy) or b) a pension benefit which will accrue at 10% per year, up to a maximum of 60%
which will vest at five years of service. The percentage is applied to your final average
wage (highest 3 years in the final ten years and includes both base and annual incentive)
to determine your lifetime benefit. If you terminate for any reason other than voluntary
resignation or termination for cause prior to meeting the vesting as indicated above, part
(a) of this paragraph will become payable to you or your spouse. If Part (b) of this
paragraph applies it will be paid to you in two forms; one-half of the benefit will be
paid to you in a lump sum and the second half of the benefit will be paid to you




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in a 100% Joint & Survivor annuity which will be calculated by applying the applicable
factor to the life annuity benefit which typically equals 90% to 94% of the life annuity
benefit. Additionally, there will be no offset to any qualified pension benefits you
receive from Entergy with either option described in this paragraph.
    
    Vehicle allowance of $10,008 per year.
    
    You will receive five weeks of vacation annually.
    
    APS will provide you with a payment equal to the cost of your Entergy COBRA coverage
(grossed up for taxes) to bridge your medical coverage until the effective date of your
APS coverage. Once you enroll in our Companys benefit programs your benefits such as
medical, dental and life insurance will be effective on your one month anniversary date of
employment as long as you enroll within the first 30 days of your employment. Medical and
dental plan premiums are on a pre-tax basis. Additionally, APS will provide lifetime
medical coverage for you and your spouse either by coverage under a plan offered by the
Company or by purchasing an insurance policy with equivalent coverage subject to the usual
employee premium cost sharing unless you voluntarily resign or are terminated for cause
within your first five years of employment. If you should die, become disabled or the
Company experiences a change of control in which your KEESA (Key Executive Employment &
Severance Agreement) is applicable, prior to completing five years of service, you and/or
your spouse will be provided medical coverage in the same manner as described earlier.
After the final deferred compensation tax rules are issued, we may want to document this
arrangement in a supplemental agreement to avoid or minimize any adverse tax treatment for
you.
    
    The Companys Deferred Compensation Plan allows you to voluntarily defer part of your
compensation on a pre-tax basis. The deferred amount also earns interest currently at
7.5%. The Company sets the interest rate each calendar year.
    
    Relocation benefits are coordinated through our HR Director, Donna Thomas at
602-250-2570. Relocation benefits will include household goods transportation and
storage, furnished housing and utilities for up to 12 months, or longer if business needs
arise and home sale and home finding assistance, if needed.
    
    You will also develop and participate in Palo Verde specific compensation opportunities
of up to $125,000. We would look to your recommendations in determining the measures for
these incentives (i.e. INPO, planned outages, etc).




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Attachment B
 Summary of Pinnacle West Retention Unit Awards
  
    
    vest in one-fourth increments on an annual basis;
    
    fully vest before the end of the regular vesting period if the participant retires,
becomes disabled, or dies (unvested Retention Units are forfeited if the participant
terminates employment for any other reason);
    
    are payable in cash to the participant as the Retention Units vest, in an amount
equal to the number of Retention Units vesting multiplied by the Fair Market Value (in
the case of a participants death, disability, or retirement before the end of the
vesting period, the Retention Units are payable on the dates and in the percentages
specified in the vesting schedule, even though fully vested); and
    
    accrue dividend rights equal to the amount of dividends that a participant would
have received if the participant had directly owned one share of Pinnacle West common
stock for each Retention Unit held by the participant, with the dividend rights
payable only on the Retention Units that actually vest, plus interest at the rate of
5% per annum, compounded quarterly.