Document:

Exhibit 10(a)

Exhibit 10(a)

UNISOURCE ENERGY CORPORATION

OFFICER CHANGE IN CONTROL AGREEMENT

This Officer Change in Control Agreement (the “Agreement”) is made and entered into by and
between UniSource Energy Corporation (“Company”) and Michael J. DeConcini (“Executive”), effective
as of the date set forth below (the “Effective Date”).

RECITALS

A. The Board of Directors of Company (the “Board”) believes that it is in the best interests
of Company and its shareholders to take appropriate steps to ensure the continuity in the
management of Company and its Affiliates (as defined in this Agreement), in the event a Change in
Control (as defined in this Agreement) occurs.

B. Executive currently serves as an officer of Company and one or more of its Affiliates.

C. The Board has determined that Executive is a key employee whose continued service to
Company and the applicable Affiliate(s) is critical in the event a Change of Control is being
considered or occurs.

D. In order to ensure that Company retains Executive’s services in the event a Change in
Control is being considered or occurs, the Board has decided to offer to Executive the Change in
Control Severance Benefits described in this Agreement.

NOW THEREFORE, in consideration of Executive’s continued service to Company and the mutual
agreements contained in this Agreement, and for other good and valuable consideration, the receipt
and sufficiency of which Executive hereby acknowledges, Company and Executive agree as follows:

AGREEMENT

1. TERM OF AGREEMENT.

This Agreement is effective immediately and will continue in effect until December 31, 2010
(the “Initial Term”). This Agreement will be automatically renewed at the end of the Initial Term
for additional terms commencing on each January 1, and ending on the next following December 31 (a
“Renewal Term”), unless Company provides Executive with written notice of its intent to terminate
the Agreement at least 12 months before the end of the Initial Term or the applicable Renewal Term.
If a Change in Control occurs during the Initial Term or any Renewal Term, the scheduled
expiration date of the Initial Term or Renewal Term, as the case may be, shall be extended for a
term ending on the 24-month anniversary of the Change in Control, at which time this Agreement will
expire. The expiration of the term of this Agreement will not reduce or diminish any liabilities
that have accrued prior to the expiration.

 

 

 

2. CHANGE IN CONTROL SEVERANCE BENEFITS.

(a) Entitlement to Change in Control Severance Benefits. Executive will be entitled
to receive the “Change in Control Severance Benefits” described in this Section 2 if Executive
incurs a “Separation from Service” (as defined in Section 3) due to Company’s termination of
Executive’s employment without “Cause” (as defined in Section 4) or due to Executive’s termination
of employment with Company for “Good Reason” (as defined in Section 5) during the six-month period
prior to the occurrence of a “Change in Control” (as defined in Section 7) and if Executive’s
Separation from Service is effected in contemplation of such Change in Control. Executive also
will be entitled to receive the Change in Control Severance Benefits described in this Section 2 if
Executive incurs a Separation from Service due to Company’s termination of Executive’s employment
with Company without Cause or due to Executive’s termination of employment with Company for Good
Reason during the 24-month period following the occurrence of a Change in Control.

The Change in Control Severance Benefits described in this Section 2 will not be payable if
Executive’s employment is terminated for Cause, if Executive voluntarily terminates Executive’s
employment without Good Reason, or if Executive’s employment is terminated by reason of Executive’s
“Disability” (as defined in Section 6) or Executive’s death. In addition, the Change in Control
Severance Benefits will not be payable if Executive’s employment is terminated by Executive or
Company for any or no reason more than six-months prior to the occurrence of a Change in Control or
more than 24 months following the occurrence of a Change in Control. The Change in Control
Severance Benefits also will not be payable if Executive’s employment is terminated within
six-months prior to a Change in Control if such termination is effected for reasons other than in
contemplation of a Change in Control.

Further, as noted in Section 2(f), a transfer to an Affiliate is not a Separation from Service
for purposes of this Agreement.

(b) Change in Control Severance Benefits. If Executive is entitled to receive Change
in Control Severance Benefits pursuant to Section 2(a), the Change in Control Severance Benefits
provided to Executive pursuant to the terms of this Agreement will consist of the following:

(i) A single lump sum cash payment in an amount equal to one and one-half times the greater of
(a) Executive’s annualized base salary as of the date of Executive’s Separation from Service or (b)
Executive’s annualized base salary in effect immediately prior to any material diminution in
Executive’s base salary following the execution of this Agreement.

(ii) A single lump sum cash payment in an amount equal to one and one-half times the average
payment to which Executive was entitled pursuant to the UniSource Energy Corporation Performance
Enhancement Plan or any successor plan (the “Incentive Compensation Plan”) for the three calendar
years immediately preceding the calendar year in which Executive’s Separation from Service occurs.
If, during each of the three calendar years prior to the year in which Executive’s Separation from
Service occurs, Executive was not eligible to (a) participate in the Incentive Compensation Plan or
(b) receive a payment pursuant to the Incentive Compensation Plan based on Executive’s pay grade
level in effect at the time of
Executive’s Separation from Service, then Executive’s target payment under the Incentive
Compensation Plan for the year of Executive’s Separation from Service will be used to calculate the
amount to which Executive is entitled pursuant to this paragraph (ii) in lieu of the average
payment for the preceding three years.

 

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(iii) A single lump sum cash payment in an amount equal to a prorated portion (based on the
number of calendar days that have elapsed during the calendar year prior to the date of Executive’s
Separation from Service) of the payment to which Executive would be entitled under the Incentive
Compensation Plan (had Executive’s Separation from Service not occurred) for the calendar year in
which Executive’s Separation from Service occurs. The payment due pursuant to this paragraph (iii)
will be based on Executive’s target payment under the Incentive Compensation Plan for the year in
which Executive’s Separation from Service occurs.

(iv) A single lump sum cash payment in the amount of the payment, if any, to which Executive
is entitled under the Incentive Compensation Plan (based on Executive’s actual performance) for the
year prior to the year in which the Executive’s Separation from Service occurs, to the extent
Executive has not yet received such payment from Company.

(v) The continuation of any health, life, disability or other insurance benefits that
Executive was receiving as of Executive’s last day of active employment for a period expiring on
the earlier of (a) 18 months following Executive’s Separation from Service or, if Executive’s
Separation from Service occurs within six months prior to the occurrence of a Change in Control,
for the 18 months following the date on which the Change in Control occurs or (b) the day on which
Executive becomes eligible to receive any substantially similar benefits, on a benefit-by-benefit
basis, under any plan or program of any successor employer. The continuation of any health, life,
disability or other insurance benefits shall run concurrently with Executive’s COBRA continuation
coverage for health benefits. Company will satisfy the obligation to provide the health insurance
benefits pursuant to this paragraph (v) by either paying for or reimbursing Executive for the
employer’s portion of the COBRA premium (and Executive shall cooperate with Company in all respects
in securing and maintaining such benefits, including exercising all appropriate COBRA elections and
complying with all terms and conditions of such coverage in a manner to minimize the cost). In the
event Executive’s right to Company’s continued payment for the employer’s portion of health
insurance benefits extends beyond the applicable COBRA coverage period, Company will satisfy the
obligation to provide the health insurance benefits by either paying for or reimbursing Executive
for the employer’s portion of premiums for health insurance benefits that are comparable to those
Executive receives during the COBRA continuation period. Company also will reimburse Executive for
the employer’s portion of the cost of comparable coverage for all other insurance benefits that are
not subject to the COBRA continuation rules. It will be Executive’s responsibility to procure such
benefits and Company will promptly reimburse Executive for the employer’s portion of the premiums
for such benefits upon Executive’s submission of an invoice or other acceptable proof of payment.
For purposes of this Agreement, the “employer’s portion” is an amount equal to the cost of
Company’s corresponding coverage for the applicable benefit for an active employee at Executive’s
level at the time of Executive’s Separation from Service.

 

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Notwithstanding the foregoing, if Executive has elected a health care option pursuant to which
Company has agreed to make contributions to Executive’s Health Savings Account, then Company will
pay to Executive a single lump sum cash payment in an amount equal to the contributions that
Company would have made to Executive’s Health Savings Account during the 18-month benefit
continuation period described above had Executive not incurred a Separation from Service.

(c) Timing of Lump Sum Change in Control Severance Benefits. The lump sum Change in
Control Severance Benefit payments described in Sections 2(b)(i), (ii), (iii), (iv) and (v) that
become payable due to Executive’s Separation from Service within the six-month period prior to a
Change in Control will be paid to Executive within 20 days following the later of the (1) date on
which the Change in Control occurs or (2) the expiration of the revocation period provided in the
release required pursuant to Section 2(d). In the event Executive becomes entitled to the Change
in Control Severance Benefit payments described above as a result of Executive’s Separation from
Service within the 24-month period following a Change in Control, such payments will be paid to
Executive within 20 days following the later of (1) the date of Executive’s Separation from Service
or (2) the expiration of the revocation period provided in the release required pursuant to Section
2(d). The payment provisions set forth in this Section 2(c) are subject to the provisions of
Section 8(b) (which generally requires a six-month delay in payments to a Specified Employee), if
applicable.

(d) Release Agreement. In order to receive the Change in Control Severance Benefits
described in this Section 2, Executive must execute (and not revoke) any release reasonably
requested by Company of any claims that Executive may have against Company or any Affiliate in
connection with Executive’s employment with Company and/or any Affiliate or otherwise. The release
shall be provided to Executive within five days following the occurrence of a Change in Control, in
the event Executive’s Separation from Service occurs during the six-month period prior to the
occurrence of a Change in Control. The release shall be provided to Executive within five days
following Executive’s Separation from Service, in the event such Separation from Service occurs
during the 24-month period following the occurrence of a Change in Control. If Executive is 40
years of age or older, Executive shall have either 21 or 45 calendar days (with the exact amount of
time to be specified by Company in the release) following the date the release is given to
Executive to sign and return the release to Company. If Executive is 40 years of age or older, then
within seven calendar days after delivery of the release to Company by Executive, Executive shall
be entitled to revoke the release by returning the signed copy or counterpart original of the
release to Company. The returned release shall include Executive’s written signature in a space
provided thereon, indicating his or her decision to revoke the release. The revocation of a
previously signed and delivered release pursuant to the above shall be deemed to constitute an
irrevocable election by Executive to have declined to receive Change in Control Severance Benefits
pursuant to this Agreement. If Executive is younger than 40 years of age, Executive shall have ten
calendar days following the date the release is given to Executive to sign and return the release
to Company. If Executive is younger than 40 years of age, Executive shall not be entitled to
revoke the release.

(e) Compliance with Covenants. Executive’s receipt of the Change in Control Severance
Benefits described in this Section 2 also is expressly conditioned upon
Executive’s continued compliance with the provisions of Section 10 (Intellectual
Property) and Section 11 (Restrictive Covenants).

 

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(f) Transfers to Affiliates. In order to receive the Change in Control Severance
Benefits, Executive must incur a Separation from Service with Company which, as noted below,
generally requires Executive’s Separation from Service with UniSource Energy Corporation and all of
its Affiliates. As a result, a transfer to an Affiliate will not be treated as a Separation from
Service for purposes of this Agreement. For purposes of determining whether a transfer constitutes
Good Reason for Executive’s Separation from Service pursuant to Section 5, a transfer shall be
treated the same as a reassignment within Company.

(g) “Affiliate” Defined. For purposes of this Agreement, the term “Affiliate” shall
have the meaning assigned in Treas. Reg. § 1.409A-1(h)(3) (which generally requires 50% common
ownership).

(h) Employment by Successor. For purposes of this Agreement, employment by a
successor of Company or a successor of one of its Affiliates shall be considered to be employment
by Company or one of its Affiliates. As a result, if Executive is employed by such a successor
following a Change in Control, Executive will not be entitled to receive the Change in Control
Severance Benefits provided by this Section 2 unless Executive subsequently incurs a Separation
from Service with the successor either without Cause or for Good Reason within 24 months following
the Change in Control.

(i) Non-Duplication of Benefits. Except as otherwise provided in Section 2(j), the
right to receive any Change in Control Severance Benefits under this Agreement is specifically
conditioned upon the Executive either waiving or being ineligible for any and all benefits under
any other severance, retention or change in control plan, program or agreement sponsored by Company
or any successor.

(j) Severance Plan Benefits. Notwithstanding Section 2(i), if Executive incurs a
Separation from Service for which Executive becomes entitled to, and receives, severance benefits
pursuant to the UniSource Energy Corporation Severance Pay Plan (the “Severance Plan”) and if
Executive’s Separation from Service occurs within six months prior to the occurrence of a Change in
Control and is effected in contemplation of such change in Control, Executive also will be entitled
to Change in Control Severance Benefits pursuant to this Agreement. The payments and benefits due
to Executive as Change in Control Severance Benefits then will be reduced by the amount of any
payment or benefit Executive already has received pursuant to the Severance Plan.

3. SEPARATION FROM SERVICE DEFINED.

For purposes of this Agreement, the term “Separation from Service” means, either (a)
termination of Executive’s employment with Company and all Affiliates, or (b) a permanent reduction
in the level of bona fide services Executive provides to Company and all Affiliates to an amount
that is 20% or less of the average level of bona fide services Executive provided to Company in the
immediately preceding 36 months, with the level of bona fide service calculated in accordance with
Treas. Reg. § 1.409A-1(h)(1)(ii).

 

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Solely for purposes of determining whether Executive has a “Separation from Service,”
Executive’s employment relationship is treated as continuing while Executive is on military leave,
sick leave, or other bona fide leave of absence (if the period of such leave does not exceed six
months, or if longer, so long as Executive’s right to reemployment with Company or an Affiliate is
provided either by statute or contract). If Executive’s period of leave exceeds six months and
Executive’s right to reemployment is not provided either by statute or by contract, the employment
relationship is deemed to terminate on the first day immediately following the expiration of such
six-month period. Whether a termination of employment has occurred will be determined based on all
of the facts and circumstances and in accordance with regulations issued by the United States
Treasury Department pursuant to Section 409A of the Code.

4. CAUSE DEFINED.

Company may terminate Executive’s employment at any time for “Cause” upon written notice to
Executive specifying the basis for the termination. If Executive incurs a Separation from Service
due to Company’s termination of Executive’s employment for “Cause,” Executive shall not be entitled
to any Change in Control Severance Benefits pursuant to this Agreement. For purposes of this
Agreement, the term “Cause” shall mean the termination of Executive’s employment by Company for one
or more of the following reasons:

(a) Executive’s willful failure to perform any of Executive’s duties which continues after
Company has given Executive written notice describing Executive’s failure and provided to Executive
an opportunity to cure such failure within 30 days (or such longer period as may be specified by
the Board) of such written notice; or

(b) Executive’s material violation of Company policy; or

(c) Any act of fraud or dishonesty resulting or intended to result in Executive’s personal
enrichment at Company’s or any Affiliate’s expense; or

(d) Executive’s gross misconduct in the performance of Executive’s duties that results in
material economic harm to Company or any Affiliate; or

(e) Executive’s conviction of, or plea of guilty or no contest (or its equivalent) to, a
felony; or

(f) Executive’s material breach of Executive’s employment agreement with Company, if any.

The existence of Cause shall be determined by the Board, in its discretion.

5. GOOD REASON DEFINED.

Executive may Separate from Service due to Executive’s termination of employment with Company
for “Good Reason” if Executive provides Company with notice of such termination as set forth below.
For purposes of this Agreement, the term “Good Reason” shall mean and include each of the
following (unless Executive has expressly agreed to such event in a signed writing):

 

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(a) A material, adverse diminution in Executive’s authority, duties, or responsibilities; or

(b) A material change in the geographic location at which Executive must primarily perform
services; or

(c) A material diminution in Executive’s base salary provided that such diminution is not a
result of a generally applicable reduction in the base salary of all officers of Company in an
amount that does not exceed 10%; or

(d) Any action or inaction that constitutes a material breach of this Agreement by Company
which, for this purpose, shall include, but not be limited to, Company’s failure to ensure that any
successor to Company or to any Affiliate assumes Company’s obligations pursuant to this Agreement.

Notwithstanding any provisions of this Agreement to the contrary, none of the events described
in this Section 5 will constitute Good Reason if, within 30 days after Executive provides Company
with a written notice specifying the occurrence or existence of the breach or action that Executive
believes constitutes Good Reason, Company has fully corrected (or reversed) such breach or action.
Executive’s Separation from Service for Good Reason will occur on the day following the expiration
of this 30 day “cure period,” (unless Company has fully corrected (or reversed) such breach or
action) unless Executive and Company agree to a later date not later than two years following the
initial existence of such breach or action. Executive shall be deemed to have waived Executive’s
right to terminate for Good Reason with respect to any such breach or action if Executive fails to
notify Company in writing of such breach or action within 90 days of the event that gives rise to
such breach or action.

6. DISABILITY DEFINED.

For purposes of this Agreement, the term “Disability” means Executive is, by reason of any
medically determinable physical or mental impairment that can be expected to (a) result in death or
(b) last for a continuous period of not less than 12 months, unable to continue to perform the
essential functions of Executive’s job, with or without any accommodation required by law, for six
consecutive calendar months or for shorter periods aggregating 125 business days in any 12-month
period.

7. CHANGE IN CONTROL DEFINED.

For purposes of this Agreement, “Change in Control” shall mean each occurrence of any of the
following:

(a) Any person, or more than one person acting as a group (as determined in accordance with
Treas. Reg. § 1.409A-3(i)(5)), acquires (or has acquired during the 12-month period ending on the
most recent acquisition by such person or persons) ownership of stock of Company possessing 40% or
more of the total voting power of the stock of Company, unless such person is, or shall be, a
trustee or other fiduciary holding securities under an employee benefit plan of Company or a
corporation owned, directly or indirectly, by the stockholders of Company in substantially the same
proportion as their ownership of stock of Company;

 

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(b) The closing of a merger or consolidation of Company or its subsidiary, Tucson Electric
Power Company (“TEP”), with another entity that is not affiliated with Company immediately before
the Change in Control; provided, however, that, in the case of a merger or consolidation involving
Company, if the merger or consolidation results in the voting securities of Company outstanding
immediately prior thereto continuing to represent, either by remaining outstanding or by being
converted into voting securities of the surviving entity, more than 50% of the combined voting
power of the voting securities of Company or such surviving entity outstanding immediately after
such merger or consolidation, the merger or consolidation will be disregarded; and provided further
that, in the case of a merger or consolidation involving TEP, if Company continues to hold more
than 50% of the combined voting power of the voting securities of TEP or the surviving entity
outstanding immediately after such merger or consolidation, the merger or consolidation will be
disregarded;

(c) During any period of 12 consecutive months, excluding any period prior to the execution of
this Agreement, the majority of members of Company’s Board is replaced by directors whose
appointment or election is not endorsed by a majority of the members of the Board before the date
of such appointment or election; or

(d) Company’s execution of an agreement for the sale or disposition by Company of all or
substantially all of Company’s assets.

Notwithstanding the foregoing, a Change in Control will not be deemed to have occurred until:
(1) any required regulatory approval, including any final non-appealable regulatory order, has been
obtained; and (2) the transaction that would otherwise be considered a Change in Control closes.
Further, to the extent required by Section 409A of the Code, a transaction will not be considered a
Change in Control for purposes of this Section 7 unless the transaction also constitutes a “change
in control event” as such term is used in Treas. Reg. § 1.409A-3(i)(5).

8. SECTION 409A COMPLIANCE.

(a) Compliance Strategy; Responsibility for Taxes. Section 409A of the Code imposes
an additional 20% tax, plus interest, on payments from “non-qualified deferred compensation plans.”
Certain payments under this Agreement could be considered to be payments under a “non-qualified
deferred compensation plan.” The additional 20% tax, and interest, does not apply if the payment
qualifies for an exception to the requirements of Section 409A of the Code or complies with the
requirements of Section 409A of the Code. Company intends that the payments and benefits due
pursuant to this Agreement either comply with the requirements of Section 409A of the Code or
qualify for an exception to the requirements of Section 409A of the Code. Nevertheless, Company
does not guarantee any particular tax effect or treatment of the amounts due under this Agreement.
Except for Company’s responsibility to withhold applicable income and employment taxes from
compensation paid or provided to Executive, Company will not be responsible for the payment of any
applicable taxes on compensation paid or provided pursuant to this Agreement.

 

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(b) Delay in Payments. Prior to making any payments due under this Agreement, Company
will determine, on the basis of any regulations, rulings or other available
guidance, whether the short-term deferral exception, the separation pay exception or any other
exception to the requirements of Section 409A of the Code is available. If Executive is a
“Specified Employee” (as defined in Treas. Reg. § 1.409A-1(i)), and Company concludes that no
exception to the requirements of Section 409A of the Code is available, no payments that are
payable to Executive as a result of Executive’s Separation from Service under this Agreement, or
under any other arrangement that is aggregated with this Agreement under Section 409A of the Code,
shall be made to Executive prior to the first business day following the date which is six months
after Executive’s Separation from Service. Any amounts that would have been paid during the six
months following Executive’s Separation from Service will be paid on the first business day
following the expiration of the six-month period without interest thereon. The provisions of this
paragraph apply to all amounts due pursuant to this Agreement, other than amounts that do not
constitute a deferral of compensation within the meaning of Treas. Reg. §1.409A-1(b) or other
amounts or benefits that are not subject to the requirements of Section 409A of the Code.

(c) Distributions Treated as Made upon a Designated Event. If Company fails to make
any payment, either intentionally or unintentionally, within the time period specified in this
Agreement, but the payment is made within the same calendar year, such payment will be treated as
made within the time period specified in this Agreement pursuant to Treas. Reg. § 1.409A-3(d). In
addition, if a payment is not made due to a dispute with respect to such payment, the payment may
be delayed in accordance with Treas. Reg. § 1.409A-3(g).

(d) Reimbursements. In order to ensure compliance with the applicable regulations,
the amounts reimbursed by Company in one taxable year will not affect the amounts eligible for
reimbursement by Company in a different taxable year. All reimbursements must be made no later
than December 31 of the calendar year following the calendar year in which the expense was
incurred. Executive may not elect to receive cash or any other benefit in lieu of the benefits
provided by this Agreement.

(e) Miscellaneous Payment Provisions. Under no circumstances may the time or schedule
of any payment made or benefit provided pursuant to this Agreement be accelerated or subject to a
further deferral except as otherwise permitted or required pursuant to regulations and other
guidance issued pursuant to Section 409A of the Code. Executive does not have any right to make
any election regarding the time or form of any payment due under this Agreement. This Agreement
shall be operated in compliance with Section 409A of the Code or an exception thereto and each
provision of this Agreement shall be interpreted, to the extent possible, to comply with Section
409A of the Code or to qualify for an applicable exception.

9. CAP ON PAYMENTS.

(a) General Rules. The Code places significant tax burdens on Executive and Company
if the total payments made to Executive due to a “change in control” (which, for purposes of this
Section 9, shall have the meaning ascribed to it in Section 280G of the Code and the regulations
adopted thereunder) exceed prescribed limits. For example, if Executive’s “Base Period Income” (as
defined below) is $100,000, Executive’s limit or “280G Cap” is $299,999. If Executive’s “Basic
Payments” exceed the 280G Cap by even $1.00, Executive is subject to an excise tax under Section
4999 of the Code of 20% of all amounts paid to him in excess of

 

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$100,000. In other words, if Executive’s 280G Cap is $299,999, Executive will not be subject
to an excise tax if Executive receives exactly $299,999. If Executive receives $300,000, Executive
will be subject to an excise tax of $40,000 (20% of $200,000). In order to avoid this excise tax
and the related adverse tax consequences for Company, by signing this Agreement Executive agrees
that Executive’s Basic Payments will not exceed an amount equal to Executive’s 280G Cap unless the
exception described in Section 9(e) applies.

(b) Special Definitions. For purposes of this Section 9, the following specialized
terms will have the following meanings:

(i) “Base Period Income.” “Base Period Income” is an amount equal to Executive’s
“annualized includable compensation” for the “base period” as defined in Sections 280G(d)(1) and
(2) of the Code and the regulations adopted thereunder. Generally, Executive’s “annualized
includable compensation” is the average of Executive’s annual taxable income from Company for the
“base period,” which is the five calendar years prior to the year in which the change in control
occurs. These concepts are complicated and technical and all of the rules set forth in the
applicable regulations apply for purposes of this Agreement.

(ii) “280G Cap.” “280G Cap” shall mean an amount equal to three times Executive’s
“Base Period Income” minus $1.00. This is the maximum amount which Executive may receive without
becoming subject to the excise tax imposed by Section 4999 of the Code or which Company may pay
without loss of deduction under Section 280G of the Code.

(iii) “Basic Payments.” The “Basic Payments” include any “payments in the nature of
compensation” (as defined in Section 280G of the Code and the regulations adopted thereunder), made
pursuant to this Agreement or otherwise, to Executive or for Executive’s benefit, the receipt of
which is contingent on a change in control and to which Section 280G of the Code applies.

(c) Calculating the 280G Cap. If Company believes that these rules will result in a
reduction of the payments to which Executive is entitled under this Agreement, it will so notify
Executive as soon as possible. Company will then, at its expense, retain a “Consultant” (which
shall be a law firm, a certified public accounting firm and/or a firm of recognized executive
compensation consultants working with a law firm or certified public accounting firm) to provide a
determination concerning whether Executive’s Basic Payments exceed Executive’s 280G Cap (the
“Determination”). Company will select the Consultant.

At a minimum, the Determination required by this Section must set forth the amount of
Executive’s Base Period Income, the value of the Basic Payments, the amount, if any, by which
Executive’s Basic Payments exceed Executive’s 280G Cap and the amount and present value of any
“Excess Parachute Payment.” For purposes of this Section 9(c), the term “Excess Parachute Payment”
means an amount equal to the excess of any Basic Payment to which Executive is entitled over the
Base Period Income allocated to such Basic Payment. Executive shall have the right to review the
final calculations used by the Consultant in reaching its conclusions with respect to the
Determination.

 

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If the Determination states that the Basic Payments exceed the 280G Cap, Executive’s Basic
Payments will be reduced to the extent necessary to eliminate the excess. In making such
reduction, Company first will reduce the amount of Executive’s payments under this Agreement and,
if necessary, any other payments to which Executive is entitled under any other arrangement that do
not constitute “non-qualified deferred compensation” that is subject to Section 409A of the Code.
Company will reduce the amount of any Basic Payments payable to Executive that are subject to
Section 409A of the Code only to the extent reductions in addition to those described in the
preceding sentence are necessary to avoid exceeding the 280G Cap. If reduction of any Basic
Payments which are subject to Section 409A of the Code becomes necessary to avoid exceeding the
280G Cap, Company first will reduce the non-equity based Basic Payments on a proportional basis.
To the extent additional reductions are necessary to avoid exceeding the 280G Cap, Company then
will reduce the equity based Basic Payments on a proportional basis.

If the Consultant selected to provide the Determination so requests, a firm of recognized
executive compensation consultants selected by Company (which may, but is not required to be, the
Consultant) shall provide an opinion, upon which such Consultant may rely, as to the reasonableness
of any item of compensation as reasonable compensation for services rendered before or after the
change in control.

If Company believes that Executive’s Basic Payments will exceed the limitations of this
Section 9, it will nonetheless make payments to Executive, at the times stated above, in the
maximum amount that it believes may be paid without exceeding such limitations. The balance, if
any, will then be paid after the opinions called for above have been received.

As a general rule, the Determination shall be binding on Executive and Company. Section 280G
and the excise tax rules of Section 4999, however, are complex and somewhat uncertain and, as a
result, the Internal Revenue Service may disagree with the Consultant’s conclusions. If the
Internal Revenue Service finally and conclusively determines that the 280G Cap is actually lower
than calculated by the Consultant, the 280G Cap will be recalculated by the Consultant. Any
payment over that revised 280G Cap will then be repaid by Executive to Company. If the Internal
Revenue Service finally and conclusively determines that the actual 280G Cap exceeds the amount
calculated by the Consultant, Company shall pay Executive any shortage, together with interest
thereon, from the date such amount should have been paid to the date of such payment, so that
Executive will have received or be entitled to receive the maximum amount to which Executive is
entitled under this Agreement. For purposes of this Section 9, the applicable interest rate shall
be the prime rate published by the Wall Street Journal on the date the amounts described in the
preceding sentence should have been paid to Executive.

Company has the right to challenge any determinations made by the Internal Revenue Service.
If Company agrees to indemnify Executive from any taxes, interest and penalties that may be imposed
upon Executive (including any taxes, interest and penalties on the amounts paid pursuant to
Company’s indemnification agreement), Executive must cooperate fully with Company in connection
with any such challenge. Company shall bear all costs associated with the challenge by Company of
any determination made by the Internal Revenue Service and Company shall control all such
challenges.

 

11

 

Executive must notify Company in writing of any claim or determination by the Internal Revenue
Service that, if upheld, would result in the payment of excise taxes. Such notice shall be given
as soon as possible but in no event later than 15 days following Executive’s receipt of notice of
the Internal Revenue Service’s position.

(d) Effect of Repeal or Inapplicability. In the event that the provisions of Sections
280G and 4999 of the Code are repealed without succession, this Section 9 shall be of no further
force or effect. Moreover, if the provisions of Sections 280G and 4999 of the Code do not apply to
impose the excise tax to payments under this Agreement, then the provisions of this Section 9 shall
not apply.

(e) Exception. The Consultant selected pursuant to this Section 9 will calculate
Executive’s “Uncapped Benefit” and Executive’s “Capped Benefit.” The limitations of this Section 9
will not apply if Executive’s “Uncapped Benefit” minus the excise taxes that will be imposed on
Executive pursuant to Section 4999 of the Code exceeds Executive’s “Capped Benefit.” For this
purpose, Executive’s “Uncapped Benefit” is equal to the Basic Payments to which Executive will be
entitled pursuant to this Agreement, or otherwise, without regard to the limitations of this
Section 9. Executive’s “Capped Benefit” is the amount to which Executive will be entitled pursuant
to Section 9 of this Agreement after the application of the limitations of this Section 9.

10. INTELLECTUAL PROPERTY.

(a) Proprietary Information. Executive and Company hereby acknowledge and agree that
in connection with the performance of Executive’s services, Executive shall be provided with or
shall otherwise be exposed to or receive certain proprietary information of Company. Such
proprietary information may include, but shall not be limited to, information concerning Company’s
customers and products, information concerning certain marketing, selling, and pricing strategies
of Company, and information concerning methods, manufacturing techniques, and processes used by
Company in its operations (all of the foregoing shall be deemed “Proprietary Information” for
purposes of this Agreement). Executive hereby agrees that, without the prior written consent of
Company, any and all Proprietary Information shall be and shall forever remain the property of
Company, and that during Executive’s employment with Company, and at all times thereafter,
Executive shall not in any way disclose or reveal the Proprietary Information other than to
Company’s executives, officers and other employees and agents in the normal course of Executive’s
provision of services hereunder. The term “Proprietary Information” does not include information
that (1) becomes generally available to the public other than as a result of a disclosure by
Executive contrary to the terms of this Agreement, (2) was available on a non-confidential basis
prior to its disclosure, or (3) becomes available on a non-confidential basis from a source other
than Executive, provided that such source is not contractually obligated to keep such information
confidential.

(b) Trade Secrets. Executive, prior to and during this Agreement, has had and will
have access to and become acquainted with various trade secrets that are owned by Company or by its
Affiliates and are regularly used in the operation of their respective businesses and that may give
Company or an Affiliate an opportunity to obtain an advantage over competitors who do not know or
use such trade secrets. Executive agrees and

 

12

 

acknowledges that Executive has been granted access to these valuable trade secrets only by
virtue of the confidential relationship created by Executive’s employment and Executive’s prior
relationship to, interest in, and fiduciary relationships to Company. Executive shall not disclose
any of the aforesaid trade secrets, directly or indirectly, or use them in any way, either during
Executive’s employment with Company or at any time thereafter, except as required in the course of
employment by Company and for its benefit.

(c) Ownership of Documents. Company shall own all papers, records, books, drawings,
documents, manuals, and anything of a similar nature (collectively, the “Documents”) prepared by
Executive in connection with Executive’s employment. The Documents shall be the property of
Company and are not to be used on other projects except upon Company’s prior written consent. Upon
termination of Executive’s employment with Company, Executive shall surrender to Company any and
all Documents or other property of whatsoever kind now or hereafter in Executive’s possession,
custody, or control that contain or reflect in any manner whatsoever Proprietary Information or
information that in any way relates to Company’s business.

(d) Company Defined. For purposes of this Section 10, “Company” shall be interpreted
to include Company and all of Company’s Affiliates.

11. RESTRICTIVE COVENANTS.

(a) Covenant Not to Compete. In consideration of Company’s agreements contained
herein and the payments to be made by it to Executive pursuant hereto, Executive agrees that during
the Restricted Period Executive will not, without prior written consent of Company, consult with,
engage in or act as an advisor to another company about activity that is a “Competing Business” of
such company in the Restricted Territory, as defined in this Section 11.

(b) Non-Solicitation. Executive recognizes that Company’s customers are valuable and
proprietary resources of Company. Accordingly, Executive agrees that during the Restricted Period
Executive will not directly or indirectly, through Executive’s own efforts or through the efforts
of another person or entity, solicit business in the Restricted Territory for or in connection with
any Competing Business from any individual or entity that obtained products or services from
Company at any time during Executive’s employment with Company. In addition, during the Restricted
Period Executive will not solicit business in the Restricted Territory for or in connection with a
Competing Business from any individual or entity that was solicited by Executive on behalf of
Company. Further, during the Restricted Period Executive will not solicit employees of Company who
would have the skills and knowledge necessary to enable or assist efforts by Executive to engage in
a Competing Business.

(c) Competing Business. For purposes of this Section 11, Executive shall be deemed to
be engaged in a “Competing Business” if, in any capacity, including proprietor, shareholder,
partner, officer, director or employee, Executive engages or participates, directly or indirectly,
in the operation, ownership or management of the activity of any proprietorship, partnership,
company or other business entity which activity is competitive with the then actual business in
which Company or its operating subsidiaries and Affiliates are engaged on the date of, or any
business contemplated by such entities’ business plans in effect on the date of notice

 

13

 

of, Executive’s termination of employment. Nothing in this Section 11(c) is intended to limit
Executive’s ability to own equity in a public company constituting less than 1% of the outstanding
equity of such company, when Executive is not actively engaged in the management thereof. If
requested by Executive, Company shall furnish Executive with a good-faith written description of
the business or businesses in which Company is then actively engaged or that is contemplated by
Company’s current business plan within 30 days after such request is made, and only those
activities so timely described in which Company is, in fact, actively engaged or which are so
contemplated may be treated as activities that are directly competitive with Company.

(d) Restricted Period. For purposes of this Section 11, the “Restricted Period” shall
include the time during which Executive is employed by Company and a period of one year (or in the
event any reviewing court finds this period to be over-broad or unenforceable, for a period of nine
months; or in the event any reviewing court finds this period to be over-broad or unenforceable,
for a period of six months) following the termination of Executive’s employment with Company for
any reason.

(e) Restricted Territory. Executive and Company understand and agree that Company’s
business is not geographically restricted and in some respects at least is unrelated to the
physical location of Company facilities or the physical location of any Competing Business, due to
extensive use of the power grid, Internet, telephones, facsimile transmissions and other means of
electronic information and product distribution. Executive and Company further understand and
agree that Executive will, in part, work toward expanding Company’s markets and geographic business
territories and will be compensated for performing this work on behalf of Company.

Accordingly, Company has a protectable business interest in, and the parties intend the
Restricted Territory to encompass, each and every geographical location from which Executive could
engage in a Competing Business. If, but only if, this Restricted Territory is held to be invalid
on the ground that it is unreasonably broad, the Restricted Territory shall be limited to any
geographical location that is within 10 miles of any geographical location in which Company is in
fact carrying out its business operations or, pursuant to Company’s business plans, is
contemplating conducting business operations on the date of Executive’s termination of employment.
If, but only if, this Restricted Territory is held to be invalid on the ground that it is
unreasonably broad, the Restricted Territory shall be any location within a 50 mile radius of any
Company office in existence or, pursuant to Company’s business plans, intended to be opened at the
time of Executive’s termination of employment.

(f) Remedies; Reasonableness. Executive acknowledges and agrees that a breach by
Executive of the provisions of this Section 11 will constitute such damage as will be irreparable
and the exact amount of which will be impossible to ascertain and for that reason agrees that
Company will be entitled to an injunction to be issued by any court of competent jurisdiction
restraining and enjoining Executive from violating the provisions of this Section 11. The right to
an injunction shall be in addition to and not in lieu of any other remedy available to Company for
such breach or threatened breach, including the recovery of damages from Executive.

 

14

 

Executive expressly acknowledges and agrees that: (1) the Restrictive Covenants contained
herein are reasonable as to time and geographical area and do not place any unreasonable burden
upon Executive, (2) the general public will not be harmed as a result of enforcement of these
Restrictive Covenants, and (3) Executive understands and hereby agrees to each and every term and
condition of the Restrictive Covenants set forth in this Agreement.

Executive also expressly acknowledges and agrees that Executive’s covenants and agreements in
this Section 11 shall survive this Agreement and continue to be binding upon Executive after the
expiration or termination of this Agreement, whether by passage of time or otherwise.

(g) Company Not in Default. Company agrees that the restrictions described in this
Section 11 apply only so long as Company is continuously not in material default of its obligations
to provide payments or employment-type benefits to Executive hereunder or under any other
agreement, covenant or obligation.

(h) Company Defined. For purposes of this Section 11, “Company” shall be interpreted
to include Company and all of Company’s Affiliates.

12. NO MITIGATION.

The payment of Change in Control Severance Benefits will not be affected by whether Executive
seeks or obtains other employment. Executive will have no obligation to seek or obtain other
employment and Executive’s Change in Control Severance Benefits will not be impacted by Executive’s
failure to “mitigate.” As provided in Section 2(b)(v), however, Company’s obligation to provide
continued health, life, disability and other insurance benefits will cease with respect to a
particular type of coverage when and if Executive becomes eligible to receive substantially similar
coverage with a successor employer.

13. SUCCESSORS.

Company will require any successor (whether direct or indirect, by purchase, merger,
consolidation or otherwise) to all or substantially all of the business and/or assets of Company or
any Affiliate to expressly assume and agree to perform this Agreement in the same manner and to the
same extent that Company or any Affiliate would be required to perform it if no such succession had
taken place. Failure of Company to obtain such assumption and agreement prior to the effectiveness
of any such succession shall be a material breach of this Agreement.

14. BINDING AGREEMENT; ASSIGNMENT.

This Agreement shall inure to the benefit of and be binding upon Company, its successors and
assigns, including, but not limited to, any company, person, or other entity which may acquire all
or substantially all of the assets and business of Company or any company with or into which
Company may be consolidated or merged, and Executive, Executive’s heirs, executors, administrators,
and legal representatives. Nevertheless, the obligations, rights and benefits of Executive
hereunder are personal and may not be delegated, assigned or transferred in any manner whatsoever,
nor are such obligations, rights or benefits subject to involuntary
alienation, assignment or transfer. This Agreement shall be assigned automatically to any
entity merging with or acquiring Company or its business.

 

15

 

15. NOTICE.

All notices hereunder shall be in writing and delivered personally or sent by United States
registered or certified mail, postage prepaid and return receipt requested:

	 	 	 
	If to Company, to:

	 	UniSource Energy Corporation

One South Church Avenue, Suite 1820

Tucson, Arizona 85701

	 	 	 
	If to Executive, to:

	 	Michael DeConcini

Mail Stop UE182

Tucson Electric Power Company

P.O. Box 711

Tucson, AZ 85702-0711
	 
	 	 
	 

	 	with an additional copy to:
	 
	 	 
	 

	 	Michael DeConcini

1042 E. Rudasil Rd.

Tucson, AZ 85718

Either party may change the address to which notices are to be sent to it by giving ten days
written notice of such change of address to the other party in the manner above provided for giving
notice.

Notices will be considered delivered on personal delivery or on the date of deposit in the
United States mail in the manner provided for giving notice by mail.

16. MISCELLANEOUS.

No provision of this Agreement may be modified, waived or discharged unless such waiver,
modification or discharge is agreed to in writing and signed by Executive and the Chief Executive
Officer of Company or his designee. No waiver by either party hereto at any time of any breach by
the other party hereto of, or compliance with, any condition or provision of this Agreement to be
performed by such other party shall be deemed a waiver of similar or dissimilar provisions or
conditions at the same or at any prior or subsequent time. Any payments provided for hereunder
shall be paid net of any applicable withholding required under federal, state or local law. The
obligations of Company that arise prior to the expiration of this Agreement shall survive the
expiration of the term of this Agreement.

 

16

 

17. SEVERABILITY.

If any term or provision of this Agreement is declared by a court or tribunal of competent
jurisdiction to be invalid or unenforceable for any reason, this Agreement shall remain
in full force and effect, and either (a) the invalid or unenforceable provision shall be
modified to the minimum extent necessary to make it valid and enforceable or (b) if such a
modification is not possible or permitted by law, this Agreement shall be interpreted as if such
invalid or unenforceable provision were not a part hereof.

18. COUNTERPARTS.

This Agreement may be executed in several counterparts, each of which shall be deemed to be an
original but all of which together will constitute one and the same instrument.

19. ALTERNATIVE DISPUTE RESOLUTION.

(a) The parties agree that any controversy, dispute or claim arising out of or relating to the
Agreement or breach thereof, including without limitation Executive’s employment with or separation
of employment from Company, compensatory and punitive damages, and to the extent allowable by law,
all claims that Company or any of its representatives engaged in conduct prohibited on any basis
under any federal, state, or local statute, including federal or state discrimination statutes or
public policy (collectively the “Dispute”), shall be resolved in accordance with the procedures
described in this Section, which shall be the sole and exclusive procedures for resolution of any
Dispute. The parties shall bear their own attorneys’ fees and costs, unless provided otherwise by
an arbitration award, and share equally the cost thereof of all Dispute Resolution procedures
described in the Section.

(b) The parties shall initially try in good faith to settle the Dispute through non-binding
mediation. A party seeking mediation shall make a written request for mediation by certified mail,
return receipt requested, setting forth with reasonable specificity the basis for the Dispute and
the relief requested. A neutral third party mediator shall be agreed upon by the parties. If,
within 14 days after a party makes a written request for mediation or within any longer period
mutually agreed upon by the parties, the parties have not agreed upon the identity of the mediator
and the procedure for mediation, the mediation shall be held in Tucson, Arizona, and administered
by the American Arbitration Association (“AAA”) under its Employment Arbitration and Mediation
Procedures formally known as the National Rules for Resolution of Employment Disputes (“Rules”)
currently in effect. Unless otherwise agreed, the parties shall select a mediator as provided by
the Rules. A good faith attempt at mediation shall be a condition precedent to the commencement of
arbitration, but is not a condition precedent to any court action for injunctive or other interim
relief pending the outcome of these Dispute Resolution procedures.

(c) If the parties are unable to resolve the dispute by mediation in a timely manner (which,
in any case, shall not exceed 60 days from the first notice of mediation or such longer period
mutually agreed upon by the parties), the Dispute shall be resolved by final, binding and
conclusive arbitration with a sole arbitrator in Tucson, Arizona. The parties shall initiate
arbitration by filing a written notice of intention to arbitrate at any office of the AAA. The
selection of the arbitrator and the arbitration shall proceed pursuant to the Rules and judgment
upon the award rendered by the arbitrator may be entered in any court having jurisdiction thereof.

 

17

 

(d) The arbitrator shall award Executive his attorneys’ fees and costs if Executive prevails
on at least one material issue in the Dispute, including the attorneys’ fees Executive incurs in
connection with any appeal or the enforcement of any award. “Attorneys’ fees and costs” mean all
reasonable pre-award expenses, administrative fees, travel expenses, out-of-pocket expenses such as
copying and telephone costs, witness fees and attorneys’ fees. Any award of attorneys’ fees and
costs to Executive shall be paid by Company within 60 days following the award of such fees and
costs by the arbitrator, but in no event later than December 31 of the calendar year following the
year of the conclusion of the arbitration.

A party may apply to the arbitrator for injunctive or other equitable relief until the
arbitration award is rendered or the matter is otherwise resolved. A party may, without waiving
the Dispute Resolution procedures under the Agreement, seek from any court having jurisdiction any
interim or provisional relief, including a temporary restraining order, an injunction both
preliminary and final, and any other appropriate equitable relief, that is necessary to protect the
rights or property of that party, pending the final decision of the arbitrator on all issues
related to the injunctive relief.

20. PAYMENT OBLIGATIONS ABSOLUTE.

Company’s obligation to pay Executive the compensation and to make the arrangements in
accordance with the provisions herein shall be absolute and unconditional and shall not be affected
by any circumstances. All amounts payable by Company in accordance with this Agreement shall be
paid without notice or demand. If Company has paid Executive more than the amount to which
Executive is entitled under this Agreement, Company shall have the right to recover all or any part
of such overpayment from Executive or from whomsoever has received such amount.

21. ENTIRE AGREEMENT.

This Agreement sets forth the entire agreement between Executive and Company concerning the
subject matter discussed in this Agreement and supersedes all prior agreements, promises,
covenants, arrangements, communications, representations or warranties, whether written or oral, by
any officer, employee or representative of Company. Any prior agreements or understandings with
respect to the subject matter set forth in the aforementioned agreements are hereby terminated and
canceled.

22. STATUTORY REFERENCES.

All references to sections of the Code shall be deemed also to refer to any successor
provisions to such sections. All references to sections of the final regulations issued pursuant
to Section 409A shall be deemed also to refer to any successor provisions of such regulations or
rulings or other guidance that clarify such regulations.

23. DEFINITIONS.

A number of terms have been defined throughout this Agreement. These defined terms are
identified by the capitalization of the first letter of each word or the first letter of each
substantive word of a phrase. Whenever these terms are capitalized they shall be given the
defined meaning.

 

18

 

24. PARTIES.

This Agreement is an agreement between Executive and Company. In certain cases, though,
obligations imposed upon Company may be satisfied by an Affiliate of Company. Any payment made or
action taken by an Affiliate of Company shall be considered to be a payment made or action taken by
Company for purposes of determining whether Company has satisfied its obligations under this
Agreement.

25. NO RIGHTS IN ANY PROPERTY OF COMPANY.

The undertakings of Company constitute merely the unsecured promise of Company to make
payments as provided for herein. No property of Company shall, by reason of this Agreement, be
held in trust for Executive, Executive’s spouse or any other person, and neither Executive nor
Executive’s spouse or any other person shall have, by reason of this Agreement, any rights, title
or interest of any kind in any property of Company.

26. NOT AN EMPLOYMENT AGREEMENT.

Nothing in this Agreement shall be construed as an offer or commitment by Company to continue
Executive’s employment with Company for any period of time.

27. CONSTRUCTION.

This Agreement is the result of negotiation between Company and Executive and both have had
the opportunity to have this Agreement reviewed by their legal counsel and other advisors.
Accordingly, this Agreement shall not be construed for or against Company or Executive, regardless
of which party drafted the provision at issue. The language in all parts of this Agreement shall
in all cases be construed as a whole according to its fair meaning and not strictly for or against
either party. The Section headings contained in this Agreement are for reference purposes only and
will not affect the meaning or interpretation of this Agreement in any way. Whenever the words
“include,” “includes,” or “including” are used in the Agreement, they shall be deemed to be
followed by the words “without limitation.”

28. GOVERNING LAW.

This Agreement shall be governed in all respects by the laws of the State of Arizona,
excluding the conflicts of law principles, and except as preempted by or governed solely by Federal
law.

29. AMENDMENTS.

This Agreement may be amended at any time by a written agreement executed by Company and
Executive. No amendment that will result in a violation of Section 409A of the Code, or any other
provision of applicable law, may be made to this Agreement and any such amendment shall be void ab
initio.

 

19

 

IN WITNESS WHEREOF, Company and Executive have executed this Agreement on this       day of
                     2010.

	 	 	 	 	 
	 	UNISOURCE ENERGY CORPORATION

 	 
	 	
 	 
	 	By:      Kevin P. Larson 	 
	 	Its  Senior Vice President and Chief Financial Officer	 
	 

	 	 	 	 	 
	 	EXECUTIVE

 	 
	 	
 	 
	 	Michael J. DeConcini 	 
	 	 	 
	 

 

20

 

Schedule of other officers who are covered by substantially identical agreements as Michael J. DeConcini.

Kevin P. Larson, Senior Vice President, Chief Financial Officer and Treasurer

Raymond S. Heyman, Senior Vice President and General Counsel

Karen G. Kissinger, Vice President, Controller and Chief Compliance Officerexv10w12wa

Exhibit 10.12A

BIGBAND NETWORKS, INC.

TRANSITION SERVICES AGREEMENT

          This Transition Services Agreement (the “Agreement”) is entered into as of March 5, 2010 (the
“Effective Date”) by and between BigBand Networks, Inc., having a principal place of business at
475 Broadway Street, Redwood City, California 94063 (the “Company”) and Maurice Castonguay (“Mr.
Castonguay”, and collectively with the Company, the “Parties”).

          WHEREAS, the Company has employed Mr. Castonguay since March 12, 2008; and

          WHEREAS, the Parties have agreed to terminate his employment with the Company on May 1,
2010 (the “Termination Date”); and

          WHEREAS, Mr. Castonguay and the Company desire to provide for a smooth transition of
the services currently provided by Mr. Castonguay to another person;

          NOW THEREFORE, in consideration of the foregoing, the Parties agree as follows:

     1. Release Agreement. In consideration of the benefits conferred pursuant to Section
2 hereof, on the Effective Date, Mr. Castonguay shall execute a release agreement substantially in
the form attached hereto as Exhibit A, and on the Termination Date, Mr. Castonguay shall
execute a supplemental release substantially in the form attached hereto as Exhibit B in exchange for the consideration outlined in Exhibit B.

     2. Consulting Services.

          2.1 Scope of Work. Following the Termination Date until termination of this Agreement
by either Party (the “Consulting Period”), Mr. Castonguay will provide transitional consulting
services (the “Services”) to the Company as designated by Amir Bassan-Eskenazi, including making
himself available to the Company for no more than 10 hours per week. Mr. Castonguay shall use his
reasonable efforts to perform any such services in a professional and workman-like manner.

          2.2 Amount. During the Consulting Period, the Company shall pay Mr. Castonguay a
retainer of $5,000 per month, plus Mr. Castonguay shall continue to be a ‘service provider’ under
the Company’s stock incentive plans and all options and restricted stock units granted to Mr. Castonguay shall continue to
vest during the Consulting Period. Mr. Castonguay shall be solely liable for any federal, state,
or local withholding, or other payroll taxes relating to performance of the Services under this
Section 2. Mr. Castonguay shall be reimbursed for all reasonable travel and living expenses
incurred in the performance of said services hereunder to the extent such expense has been
authorized by the Company’s chief executive officer in advance.

          2.3 Independence. From and after the Termination Date through the end of the
consulting under this Agreement, Mr. Castonguay’s relationship with the Company will be that of an
independent contractor and not that of an employee. Mr. Castonguay shall have control over the
method, manner, and means of the performance of Services, subject to the express provisions of this
Agreement. Mr. Castonguay will not be eligible for any employee benefits, nor will the Company
make deductions from payments made to Mr. Castonguay for taxes, all of which will be Mr.
Castonguay’s responsibility. During the term of the consulting arrangement, Mr. Castonguay will
have no authority to enter into contracts that bind the Company or create obligations on the part
of the Company without the prior written authorization of the Company.

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     3. Term and Termination.

          3.1 Term. Mr. Castonguay shall serve as a consultant to the Company commencing on the
May 2, 2010 and terminating on August 31, 2010, unless terminated earlier pursuant to Section 3.2
hereof.

          3.2 Termination. After the Effective Date, Mr. Castonguay  may terminate this Agreement
at any time on 10 days’ written notice; and the Company may
terminate this Agreement at any time on 60 days’ written notice.
In the event of any early termination pursuant to this Section 3.2,
Mr. Castonguay shall be entitled to compensation for Services
performed under this Agreement prior to the effective date of such
termination. Mr. Castonguay’s obligations relating to confidentiality
pursuant to Section 5 hereof shall survive termination of this Agreement.

     4. Consulting or Other Services for Competitors. Mr. Castonguay represents and
warrants that he will not, during the term of this Agreement, perform any consulting or other
services for any company, person or entity whose business or proposed business in any way involves
products or services that could reasonably be determined to be competitive with the products or
services or proposed products or services of the Company.

     5. Confidentiality. Mr. Castonguay understands that the Company possesses and will
possess Confidential Information that is important to its business and may disclose information in
the course of this Agreement that is considered to be trade secrets, highly confidential, or
sensitive. As a result, during the term of this Agreement, Mr. Castonguay hereby agrees that,
during the term of this Agreement and the performance of Services under Section 2 hereof, he will
continue to be bound by and acquit himself in accordance with that certain At Will Employment,
Confidential Information, Invention Assignment and Arbitration Agreement between the Company and
himself dated March 13, 2008 (“Proprietary Rights Agreement”), a copy of which is attached hereto
as Exhibit C, including, but not limited to, the non-competition and non-solicitation
provisions thereof.

     6. Miscellaneous.

          6.1 Amendments and Waivers. Any term of this Agreement may be amended or waived only
with the written consent of both parties.

          6.2 Sole Agreement. This Agreement, including the Exhibits hereto, constitutes the
sole agreement of the parties and supersedes all oral negotiations and prior writings with respect
to the subject matter hereof.

          6.3 Notices. Any notice required or permitted by this Agreement shall be in writing
and shall be deemed sufficient upon receipt, when delivered personally or by a
nationally-recognized delivery service (such as Federal Express or UPS), or 48 hours after being
deposited in the U.S. mail as certified or registered mail with postage prepaid, if such notice is
addressed to the party to be notified at such party’s address as set forth above or as subsequently
modified by written notice.

          6.4 Choice of Law. The laws of the State of California shall govern the validity,
interpretation, construction and performance of this Agreement, without giving effect to the
principles of conflict of laws.

          6.5 Severability. If one or more provisions of this Agreement are held to be
unenforceable under applicable law, then such provision shall be excluded from this Agreement, the
balance 

2

 

of the Agreement shall be interpreted as if such provision were so excluded and the balance
of the Agreement shall be enforceable in accordance with its terms.

          6.6 Arbitration. Any dispute or claim arising out of or in connection with any
provision of this Agreement, excluding Sections 5 hereof, will be finally settled by binding
arbitration in accordance with the rules of the American Arbitration Association by one arbitrator
appointed in accordance with said rules; the party deemed by the arbitrator to have lost the
arbitration shall be responsible for all expenses of such arbitration. The arbitrator shall apply
California law, without reference to rules of conflicts of law or rules of statutory arbitration,
to the resolution of any dispute. Judgment on the award rendered by the arbitrator may be entered
in any court having jurisdiction thereof. Notwithstanding the foregoing, the parties may apply to
any court of competent jurisdiction for preliminary or interim equitable relief, or to compel
arbitration in accordance with this paragraph, without breach of this arbitration provision.

The parties have executed this Agreement on March 5, 2010.

	 	 	 	 	 	 	 
	BigBand Networks, Inc.	 	 	 	Maurice Castonguay
	 
	 	 	 	 	 	 
	By:

	 	/s/ Rob Horton
	 	 	 	/s/ Maurice Castonguay
	 

	 	 
	 	 	 	 
	 

	 	Name: Rob Horton	 	 	 	 
	 

	 	Title:   Sr. VP and General Counsel	 	 	 	 

3

 

EXHIBIT A

GENERAL RELEASE OF CLAIMS

     1. Maurice Castonguay (“Employee”) and BigBand Networks, Inc., a Delaware corporation
(“BigBand”), entered into an offer letter dated March 12, 2008 (the “Employment Agreement”).
Employee and BigBand, intending to be legally bound hereby, agree to the terms set forth in the
Transition Services Agreement and this General Release of Claims (the “Agreement”). This Agreement
will become effective on the eighth day after it is signed by Employee (the “Effective Date”),
provided that Employee has not revoked this Agreement (by written notice to BigBand’s General
Counsel or a similarly situated executive officer of BigBand) prior to that date.

     2. In exchange for the release of the claims provided for herein, BigBand will provide
Employee with the consulting arrangement under the Transition Services Agreement.

     3. In exchange for the benefits under this Agreement to which Employee is not otherwise
entitled, Employee, for himself and his respective legal successors and assigns, forever releases,
discharges and acquits BigBand and its respective current and former parent companies and
predecessors, and each of its and their respective divisions, subsidiaries, shareholders, officers,
directors, current and former employees, insurers, attorneys, accountants, agents, affiliates,
legal successors and assigns (collectively the “Released Parties”), from any and all claims,
demands, damages, debts, liabilities, actions and causes of action (collectively, “Claims”) of
every kind and nature whatsoever, whether now known or unknown, which Employee now has, or ever
had, against any of those Released Parties based upon or arising out of any matter, cause, fact,
thing, act or omission whatsoever occurring or existing at any time up to and including the date on
which Employee signs this Agreement, including, without limitation, (i) all claims related to his
employment with BigBand or the termination of that employment; (ii) any contract or tort claims,
including, without limitation, claims for breach of contract, breach of the implied covenant of
good faith and fair dealing, wrongful termination, retaliation, fraud, defamation or infliction of
emotional distress; and (iii) any claims for national origin, race, sex, age, sexual orientation,
medical condition, disability, or other discrimination or harassment arising under the California
Fair Employment and Housing Act (as amended), the Civil Rights Act of 1964 (as amended), the Age
Discrimination in Employment Act (as amended) (“ADEA”), the Americans With Disabilities Act, or any
other law or statute (all of which are hereinafter referred to as and included within the “Released
Matters”).

     4. Employee understands and agrees that this Supplemental Release is intended to cover and
does cover all claims or possible claims of every nature and kind whatsoever, whether known or
unknown, suspected or unsuspected, or hereafter discovered or ascertained, and all rights under
section 1542 of the Civil Code of California are hereby expressly waived. Employee hereto
acknowledges that he is familiar with section 1542, which reads as follows:

A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR
SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN
BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE DEBTOR.

     Employee hereto expressly, knowingly, and intentionally waives and relinquishes any and all
rights that he has under section 1542, as well as under any other similar state or federal statute
or common law principle.

4

 

     5. THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS
 OF THE STATE OF CALIFORNIA, WITHOUT REGARD TO THE CONFLICTS OR CHOICE OF LAW RULES OF SUCH STATE OR
OF ANY OTHER JURISDICTION.

     6. This Agreement shall inure to the benefit of the successors of BigBand and shall be binding
upon the Employee, his heirs, executors, administrators and successors.

     7. Employee acknowledges and agrees that he shall continue to be bound by and comply with the
terms of the At Will Employment, Confidential Information, Invention Assignment and Arbitration
Agreement between BigBand and Employee dated March 13, 2008 (“Proprietary Rights Agreement”).

     8. Employee agrees that he will not, at any time in the future, (i) make any statements to any
person who is not an Affiliate of BigBand that could reasonably be deemed to be critical or
disparaging with respect to any of the Released Parties or any products or services developed,
marketed or sold by BigBand or any subsidiary or affiliate of BigBand, or (ii) participated in
tortuous interference with the contracts and relationships of BigBand. BigBand (in the person of
the CEO, the members of the executive staff and the Board of Directors) agrees that it will not, at
any time in the future, make any statements to any person to third parties that could reasonably be
deemed to be critical or disparaging of Employee.

     9. Employee agrees that for a period of one (1) year following the Separation Date, he will
not, without the prior written consent of BigBand, on behalf of himself or any other person or
entity, directly or indirectly, encourage or solicit any employee of BigBand or any of its
subsidiaries or affiliates to terminate his or his employment with BigBand or any of its
subsidiaries or affiliates.

     10. Employee agrees that he will not voluntarily provide assistance, information or advice of
any kind, directly or indirectly (including through agents or attorneys), to any person or entity
in connection with such person or entity’s assertion of any claim or cause of action of any kind,
in court, arbitration or otherwise, against any of the Released Parties, and he shall not suggest,
induce or encourage any person or entity to do so. The foregoing sentence shall not prohibit
Employee from testifying truthfully under subpoena or providing other assistance under compulsion
of law.

     11. Employee hereby agrees to direct all inquiries, demands, requests for information or other
communications regarding this Agreement to the General Counsel of BigBand Networks, Inc. Employee
shall not contact any employee of BigBand other than the individual listed above with regard to the
contents hereof.

     12. Employee agrees to respond to BigBand’s reasonable requests in connection with any
existing or future litigation, arbitrations, mediations, claims or investigations brought by or
against or involving BigBand or any of its affiliates, agents, officers, directors or employees,
whether internal, administrative, civil or criminal in nature, in which BigBand reasonably deems
Employee’s cooperation necessary or useful. In such matters, Employee agrees to provide BigBand
with advice, assistance and/or information, including explaining matters of a factual nature,
providing sworn statements, participating in discovery and trial preparation, and giving testimony.
Employee also agrees to promptly send BigBand copies of all correspondence and documents (for
example, but not limited to, subpoenas) Employee receives in connection with any such legal
proceeding or other matters related to BigBand. Employee further agrees to act in good faith to
furnish the information and cooperation required by this paragraph. BigBand will act in good faith
so that the requirement to furnish such information and cooperation does not create an undue
hardship for Employee.

     13. In the event of any dispute or claim relating to or arising out of Employee’s employment
relationship with BigBand, this Agreement, or the termination of Employee’s employment with
BigBand, Employee and BigBand agree that all such disputes shall be fully, finally and exclusively
resolved by

5

 

binding arbitration conducted by a single arbitrator in San Mateo County, California,
and further agreed that the party deemed by the arbitrator to have lost the arbitration shall be
responsible for all expenses of such arbitration. . Employee and BigBand hereby knowingly and
willingly waive their respective rights to have any such disputes or claims tried to a judge or
jury. Notwithstanding the foregoing provisions of this Section 13, Employee covenants and agrees
not to assert any Claims against the Released Parties, in any forum or proceeding, which Employee
has released pursuant to Section 3 above.

     14. This Agreement constitutes the entire agreement between the parties with respect to the
subject matter hereof and supersedes all prior agreements (except the change of control provisions
included in Employee’s offer letter and option acceleration provisions and features that will
remain in effect until the Termination Date (as defined in the Transition Services Agreement)),
understandings, negotiations, promises, representations and warranties, both written and oral,
except for the Proprietary Rights Agreement between BigBand and Employee and any stock option
agreements between Employee and BigBand. To the extent that provisions of this Agreement conflict
with any other agreement between Employee and BigBand, the provisions of this Agreement shall
govern. This Agreement may not be modified or amended, except by a document signed by a duly
authorized executive officer of BigBand and Employee.

     15. In the event that any provision or portion of this Agreement is determined to be invalid
or unenforceable for any reason, in whole or in part, the remaining provisions of the Agreement
shall be unaffected thereby and shall remain in full force and effect to the fullest extent
permitted by applicable law.

     16. EMPLOYEE UNDERSTANDS THAT HE SHOULD CONSULT WITH AN ATTORNEY PRIOR TO SIGNING THIS
AGREEMENT AND THAT HE IS GIVING UP ANY LEGAL CLAIMS HE HAS AGAINST BIGBAND RELEASED ABOVE BY
SIGNING THIS AGREEMENT. EMPLOYEE FURTHER UNDERSTANDS THAT HE MAY HAVE UP TO 21 DAYS TO CONSIDER
THIS AGREEMENT, THAT HE MAY REVOKE IT AT ANY TIME DURING THE 7 DAYS AFTER HE SIGNS IT, AND THAT IT
SHALL NOT BECOME EFFECTIVE UNTIL THAT 7-DAY PERIOD HAS PASSED. EMPLOYEE ACKNOWLEDGES THAT HE IS
SIGNING THIS AGREEMENT KNOWINGLY, WILLINGLY AND VOLUNTARILY IN EXCHANGE FOR THE CONSIDERATION
PROVIDED FOR IN SECTION 2.

	 	 	 	 	 
	Dated:  March 5, 2010 	BIGBAND NETWORKS, INC.

 	 
	 	By:  	/s/ Rob Horton
 	 
	 	 	Rob Horton, General Counsel 	 
	 	 	 	 
	 
	Dated:  March 5, 2010 	EMPLOYEE

 	 
	 	/s/ Maurice Castonguay
 	 
	 	Maurice Castonguay 	 
	 	 	 

6

 

	 	 	 	 	 

EXHIBIT B

SUPPLEMENTAL RELEASE OF CLAIMS

     1. This supplemental release between BigBand Networks, Inc. (“BigBand”) will become
effective on the eighth day after it is signed (the “Effective Date”) by Maurice Castonguay
(“Employee”), provided that Employee has not revoked this Agreement (by written notice to BigBand’s
General Counsel or a similarly situated executive officer of BigBand) prior to that date.

     In exchange for the release of the claims provided for herein, BigBand will provide Employee
with the following:

	 	a)	 	a lump sum severance payment of $120,000.04, less applicable taxes and
other withholdings as determined by BigBand’s payroll department; such severance
payment will be made to Employee within five business days after the Effective
Date;
	 
	 	b)	 	the premiums necessary to continue the group health insurance coverages
(medical, vision and dental, but not disability or life) for Employee and his
dependents through the earlier of (i) April 30, 2011, if Employee timely elects to
continue such coverages under federal COBRA law (it being understood that such
payments will be made to the BigBand’s health insurance provider), or (ii) the date
on which Employee first becomes enrolled in a new group health insurance program
with another employer; and
	 
	 	c)	 	up to three months of outplacement services. In order to initiate and
utilize this service Employee must contact his local HR representative.

     Consistent with BigBand’s practice, Employee will receive his final paycheck (including
payment for any accrued but unused vacation) on the last date of employment. Employee acknowledges
and agrees that, except for consideration outlined in this Section 1, BigBand has paid to Employee
on May 1, 2010 (the “Separation Date”) all compensation, including, but not limited to, any and all
wages, commissions, bonuses, and accrued but unused vacation, that Employee earned during his
employment with BigBand until and including the Separation Date. Employee further acknowledges and
agrees that he will cease to accrue vacation as of the Separation Date. The Employment Agreement is
hereby terminated and is of no further force or effect, and Employee shall not be entitled to any
further monetary payments, other remuneration or other benefits of any kind, including, but not
limited to, any stock option grants, stock option vesting or other equity-based compensation from
BigBand or from any other person or entity that acts or has acted on BigBand’s behalf, other than
(i) as expressly set forth in this Section 1 or (ii) as outlined in that certain Transition
Services Agreement dated March 5, 2010.

     2. Employee agrees that, within ten (10) days after the Separation Date, he will submit his
final documented expense reimbursement statement reflecting all business expenses he incurred
through the Separation Date, if any, for which he seeks reimbursement. BigBand will reimburse
Employee for these expenses pursuant to its regular business practices.

     3. With respect to any stock options previously granted to Employee by BigBand those options
and restricted stock units will (i) cease vesting on the date that Employee is no longer deemed a ‘service provider’ under the
Company’s stock incentive plans and (ii) continue to be subject to and governed by the terms and
conditions of any applicable stock option and restricted stock unit agreements between Employee and BigBand, and the
governing equity incentive plans.

     4. In exchange for the benefits under this Agreement to which Employee is not otherwise
entitled, Employee, for himself and his respective legal successors and assigns, forever releases,
discharges

7

 

and acquits BigBand and its respective current and former parent companies and
predecessors, and each of its and their respective divisions, subsidiaries, shareholders, officers,
directors, current and former employees, insurers, attorneys, accountants, agents, affiliates,
legal successors and assigns (collectively the “Released Parties”), from any and all claims,
demands, damages, debts, liabilities, actions and causes of action (collectively, “Claims”) of
every kind and nature whatsoever, whether now known or unknown, which Employee now has, or ever
had, against any of those Released Parties based upon or arising out of any matter, cause, fact,
thing, act or omission whatsoever occurring or existing at any time up to and including the date on
which Employee signs this Agreement, including, without limitation, (i) all claims related to his
employment with BigBand or the termination of that employment; (ii) any contract or tort claims,
including, without limitation, claims for breach of contract, breach of the implied covenant of
good faith and fair dealing, wrongful termination, retaliation, fraud, defamation or infliction of
emotional distress; and (iii) any claims for national origin, race, sex, age, sexual orientation,
medical condition, disability, or other discrimination or harassment arising under the California
Fair Employment and Housing Act (as amended), the Civil Rights Act of 1964 (as amended), the Age
Discrimination in Employment Act (as amended) (“ADEA”), the Americans With Disabilities Act, or any
other law or statute (all of which are hereinafter referred to as and included within the “Released
Matters”).

     5. Employee understands and agrees that this Supplemental Release is intended to cover and
does cover all claims or possible claims of every nature and kind whatsoever, whether known or
unknown, suspected or unsuspected, or hereafter discovered or ascertained, and all rights under
section 1542 of the Civil Code of California are hereby expressly waived. Employee hereto
acknowledges that he is familiar with section 1542, which reads as follows:

A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR
SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN
BY HIM MUST HAVE MATERIALLY AFFECTED HIS SETTLEMENT WITH THE DEBTOR.

Employee hereto expressly, knowingly, and intentionally waives and relinquishes any and all rights
that he has under section 1542, as well as under any other similar state or federal statute or
common law principle.

     6. Employee agrees to return to BigBand, not later than the Separation Date, all BigBand
documents (and all copies thereof) and other BigBand property that Employee has had in his
possession at any time (other than those materials that Ravi Narula deems immaterial to BigBand’s
business), including, without limitation, BigBand files, notes, notebooks, correspondence,
memoranda, agreements, drawings, records, business plans, forecasts, financial information,
specifications, computer-recorded information, and tangible property (including, without
limitation, company-issued laptop computer, credit cards, entry cards, identification badges and
keys), and any materials of any kind that contain or embody any proprietary or confidential
information of BigBand (and all reproductions thereof in whole or in part).

     7. THIS AGREEMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED
IN ACCORDANCE WITH AND GOVERNED BY THE LAWS OF THE STATE OF CALIFORNIA, WITHOUT REGARD TO THE
CONFLICTS OR CHOICE OF LAW RULES OF SUCH STATE OR OF ANY OTHER JURISDICTION.

     8. This Agreement shall inure to the benefit of the successors of BigBand and shall be binding
upon the Employee, his heirs, executors, administrators and successors.

     9. Notwithstanding the termination of the Employment Agreement, Employee acknowledges and
agrees that he shall continue to be bound by and comply with the terms of the At Will Employment,

8

 

Confidential Information, Invention Assignment and Arbitration Agreement between BigBand and
Employee dated March 13, 2008 (“Proprietary Rights Agreement”).

     10. Employee agrees that he will not, at any time in the future, (i) make any statements to
any person who is not an Affiliate of BigBand that could reasonably be deemed to be critical or
disparaging with respect to any of the Released Parties or any products or services developed,
marketed or sold by BigBand or any subsidiary or affiliate of BigBand, or (ii) participated in
tortuous interference with the contracts and relationships of BigBand. BigBand (in the person of
the CEO, the members of the executive staff and the Board of Directors) agrees that it will not, at
any time in the future, make any statements to any person to third parties that could reasonably be
deemed to be critical or disparaging of Employee.

     11. Employee agrees that, for a period of one (1) year following the Separation Date, he will
not, without the prior written consent of BigBand, on behalf of himself or any other person or
entity, directly or indirectly, encourage or solicit any employee of BigBand or any of its
subsidiaries or affiliates to terminate his or his employment with BigBand or any of its
subsidiaries or affiliates.

     12. Employee agrees that he will not voluntarily provide assistance, information or advice of
any kind, directly or indirectly (including through agents or attorneys), to any person or entity
in connection with such person or entity’s assertion of any claim or cause of action of any kind,
in court, arbitration or otherwise, against any of the Released Parties, and he shall not suggest,
induce or encourage any person or entity to do so. The foregoing sentence shall not prohibit
Employee from testifying truthfully under subpoena or providing other assistance under compulsion
of law.

     13. Employee hereby agrees to direct all inquiries, demands, requests for information or other
communications regarding this Agreement to the General Counsel of BigBand Networks, Inc. Employee
shall not contact any employee of BigBand other than the individual listed above with regard to the
contents hereof or any other request for information or cooperation.

     14. Employee agrees to respond to BigBand’s reasonable requests in connection with any
existing or future litigation, arbitrations, mediations, claims or investigations brought by or
against or involving BigBand or any of its affiliates, agents, officers, directors or employees,
whether internal, administrative, civil or criminal in nature, in which BigBand reasonably deems
Employee’s cooperation necessary or useful. In such matters, Employee agrees to provide BigBand
with advice, assistance and/or information, including explaining matters of a factual nature,
providing sworn statements, participating in discovery and trial preparation, and giving testimony.
Employee also agrees to promptly send BigBand copies of all correspondence and documents (for
example, but not limited to, subpoenas) Employee receives in connection with any such legal
proceeding or other matters related to BigBand. Employee further agrees to act in good faith to
furnish the information and cooperation required by this paragraph. BigBand will act in good faith
so that the requirement to furnish such information and cooperation does not create an undue
hardship for Employee.

     15. In the event of any dispute or claim relating to or arising out of Employee’s employment
relationship with BigBand, this Agreement, or the termination of Employee’s employment with
BigBand, Employee and BigBand agree that all such disputes shall be fully, finally and exclusively
resolved by binding arbitration conducted by a single arbitrator in San Mateo County, California,
and further agreed that the party deemed by the arbitrator to have lost the arbitration shall be
responsible for all expenses of such arbitration. . Employee and BigBand hereby knowingly and
willingly waive their respective rights to have any such disputes or claims tried to a judge or
jury. Notwithstanding the foregoing provisions of this
Section 15, Employee covenants and agrees not to assert any Claims against the Released
Parties, in any forum or proceeding, which Employee has released pursuant to Section 4 above.

9

 

     16. In the event that any provision or portion of this Agreement is determined to be invalid
or unenforceable for any reason, in whole or in part, the remaining provisions of the Agreement
shall be unaffected thereby and shall remain in full force and effect to the fullest extent
permitted by applicable law.

     17. EMPLOYEE UNDERSTANDS THAT HE SHOULD CONSULT WITH AN ATTORNEY PRIOR TO SIGNING THIS
AGREEMENT AND THAT HE IS GIVING UP ANY LEGAL CLAIMS HE HAS AGAINST BIGBAND RELEASED ABOVE BY
SIGNING THIS AGREEMENT. EMPLOYEE FURTHER UNDERSTANDS THAT HE MAY HAVE UP TO 21 DAYS TO CONSIDER
THIS AGREEMENT, THAT HE MAY REVOKE IT AT ANY TIME DURING THE 7 DAYS AFTER HE SIGNS IT, AND THAT IT
SHALL NOT BECOME EFFECTIVE UNTIL THAT 7-DAY PERIOD HAS PASSED. EMPLOYEE ACKNOWLEDGES THAT HE IS
SIGNING THIS AGREEMENT KNOWINGLY, WILLINGLY AND VOLUNTARILY IN EXCHANGE FORTHE CONSIDERATION
PROVIDED FOR IN SECTION 1.

The parties have executed this Agreement on May ___, 2010.

	 	 	 	 	 	 	 
	BigBand Networks, Inc.	 	 	Maurice Castonguay
	 
	 	 	 	 	 	 
	By:
	 	  
	 	 
	 

	 	Name:	 	 	 	 
	 

	 	Title:	 	 	 	 

10

 

Exhibit C

Proprietary Rights Agreement

11

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