Document:

EX-10.11

 Exhibit 10.11 
 EXECUTION VERSION 
 OGE TRANSITIONAL SECONDING AGREEMENT 

THIS OGE TRANSITIONAL SECONDING AGREEMENT is made and is effective as of May 1, 2013 (the “Effective Date”),
by and between OGE Energy Corp, an Oklahoma corporation (“OGE”), and CenterPoint Energy Field Services LP, a Delaware limited partnership (the “Company”). OGE and the Company may sometimes be referred
to in this Agreement individually as a “Party” and collectively as the “Parties.” 
 WHEREAS, pursuant to that certain Master Formation Agreement, dated as of March 14, 2013 (“Master Formation Agreement”), by and among OGE, CenterPoint Energy Inc., a Texas
corporation (“CNP”) Bronco Midstream Holdings, LLC, a Delaware limited liability company (“Bronco I”), and Bronco Midstream Holdings II, LLC, a Delaware limited liability company (together with Bronco
I, the “Bronco Group”), OGE, CNP and the Bronco Group have agreed through a series of transactions to contribute to the Company all of their respective ownership interests in Enogex (as defined in the Employee Transition
Agreement) by OGE and the Bronco Group and in the CNP Midstream Entities (as defined in the Employee Transition Agreement) by CNP, and CNP OGE GP LLC, a Delaware limited liability company (“GP”), shall be the general partner
of LP; 
 WHEREAS, pursuant to the Master Formation Agreement, OGE and CNP have agreed to second certain employees to the
Company and its Subsidiaries (“Company Group”) to exclusively perform certain services for the Company Group until the Company Group has its own employees; 

WHEREAS, OGE and the Company desire to set forth their agreements with respect to the employees seconded by OGE in accordance with the
terms hereof; 
 NOW, THEREFORE, in consideration of the premises set forth above and the respective representations,
warranties, covenants, agreements and conditions contained in this Agreement, as well as other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereto agree as follows: 

 

	1.	DEFINITIONS 

“Affiliate” has the meaning set forth in Article I of the Employee Transition Agreement.

 “Agreement” means this OGE Transitional Seconding Agreement, and any exhibits,
attachments, or schedules hereto, as the same may be amended from time to time. 
 “Additional
Employee” has the meaning set forth in Section 2.1(h) of the Employee Transition Agreement. 

“Board of Directors” has the meaning set forth in the Employee Transition Agreement. 

“Company Group” has the meaning set forth in the Preamble to this Agreement. 

 “Disclosing Party” has the meaning set forth in
paragraph 8.1. 
 “Effective Date” has the meaning set forth in the Preamble to this
Agreement. 
 “Employee Transition Agreement” means the Employee Transition Agreement by
and among OGE, CNP and GP, dated as of the Effective Date. 
 “Employment Costs” means
all costs other than Severance Costs or Termination Costs incurred or accrued by Member or related to an event that occurs during the term of this Agreement, without any mark-up or profit margin, with respect to any Seconded Employee or group of
Seconded Employees, for any period, including, but not limited to those costs specifically listed in Exhibit B attached to and made a part of this Agreement. 

“Employee Transfer Date” means the date on which a Seconded Employee’s employment with Member
ends and the Seconded Employee becomes an employee of the Company or a Subsidiary of the Company. 

“GP” has the meaning set forth in the Preamble to this Agreement. 

“Master Formation Agreement” has the meaning set forth in the Preamble to this Agreement.

 “Member” means OGE or, where the context requires, the Subsidiary of OGE that employs
the Seconded Employees. 
 “Member Equity Incentive Plans” means the equity-based
incentive compensation plans sponsored by OGE. 
 “OGE” has the meaning set forth in the
Preamble to this Agreement. 
 “Replacement Employee” has the meaning set forth in
Section 2.1(h) of the Employee Transition Agreement. 
 “Seconded Employee” means
the employees listed in Exhibit A attached to and made a part of this Agreement. Exhibit A may be revised and amended from time to time by the mutual agreement of the Parties. 

“Seconded Employee Cost Estimate” has the meaning set forth in paragraph 2.7 of this Agreement

 “Secondment Termination Date” means: (a) with respect to all Seconded Employees,
the effective date of the termination of this Agreement as specified in Section 10 below; or (b) with respect to an individual Seconded Employee, (i) the date the employment of the Seconded Employee with Member is terminated, or
(ii) provided that either the Company or Member gives ninety (90) days’ written notice to the other Parties of its intent to end such Seconded Employee’s seconding assignment to the Company Group, the effective date of
termination of such Seconded Employee’s seconding assignment. 

  
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 “Severance Costs” has the meaning set forth in the
Employee Transition Agreement. 
 “Subsidiary” or “Subsidiaries”
has the meaning set forth in Article I of the Master Formation Agreement. 
 “Termination
Costs” has the meaning set forth in the Employee Transition Agreement or liabilities covered under paragraph 6.2 of this Agreement. 
 “Transferred Employee” means each Seconded Employee who accepts the Company’s or its Subsidiary’s offer of employment and who becomes an employee of the Company or such
Subsidiary. 
 “Work Product” has the meaning set forth in Section 9. 

Capitalized terms not otherwise defined in this Section 1 or elsewhere in this Agreement shall have the meaning ascribed to such term
in the Employee Transition Agreement. 
  

	2.	SECONDMENT OF SECONDED EMPLOYEES TO COMPANY GROUP 

  

	 	2.1	Member shall second to the Company Group the Seconded Employees to conduct business on behalf of the Company Group, beginning on the Effective Date or, if later, the
individual’s employment date (with the dates specified for each individual in Exhibit A, as amended from time to time) and continuing until the earlier of the Employee Transfer Date or the Secondment Termination Date in respect to
each Seconded Employee. During the period of secondment to the Company Group, the Seconded Employee shall work full-time for the Company Group and shall be expected to perform his or her work for the Company Group in its best interest. Member has
granted authority to the Company Group to exercise sufficient direction and control over the Seconded Employees assigned to the Company Group by Member as is necessary to conduct the Company Group’s business, discharge any of the Company
Group’s fiduciary responsibilities, or comply with any legal requirements applicable to the Company Group. The Seconded Employees shall be considered agents of the Company Group and not of Member while under such direction and control. The
Company Group agrees that it shall be responsible for any matters that arise in the course of performance of such work. Only Member has the right to hire and fire the Seconded Employees; provided, however, that the Company Group has the right to
refuse to have any or further services performed on its behalf by a Seconded Employee, in which case the Company Group shall be responsible for reimbursement of all Severance Costs and Termination Costs incurred by Member in respect of such Seconded
Employee. It is the intent of the Parties that the Seconded Employees remain Member’s employees during the period of secondment. All services provided by the Seconded Employees shall be provided pursuant to this Agreement for the benefit of the
Company Group. 

  
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 Member will administer and/or provide the following employer services regarding the Seconded
Employees: paying payroll/wages; payroll processing services; assignment of employees to the Company Group; administering and providing benefits; administering required federal, state and local employee payments or withholdings from wages, as well
as required employer remittances of employment taxes to federal, state and local taxing authorities. The Seconded Employees assigned to the Company Group will be paid from Member’s payroll and accounts; and, any benefits to be provided and all
taxes will be paid under Member’s federal, state and local tax identification numbers. Member shall obtain workers’ compensation insurance for all covered Seconded Employees and shall keep such coverage in force and effect at all times for
all of the covered Seconded Employees. 
  

	 	2.2	During the term of this Agreement, the Seconded Employees seconded to the Company Group hereunder: 

 

	 	(a)	shall be employed by Member; 

  

	 	(b)	shall remain subject to the terms of employment with Member as Member shall establish from time to time (including without limitation Member’s code of business
conduct and policies concerning confidential and proprietary information) and Member shall manage such employment relationship, including direction and control over the hiring and firing of the Seconded Employees; 

 

	 	(c)	shall be eligible for participation in all Member benefit plans for which they would be eligible absent their secondment to the Company Group under this Agreement; and

  

	 	(d)	shall receive base salary and other compensation as Member shall determine consistent with past practice, subject to consultation with the Board of Directors.

  

	 	2.3	The normal working hours for the Seconded Employees shall be the normal working hours of the Company Group at the Company Group site or location to which the Seconded
Employees are assigned by the Company Group. 

  

	 	2.4	At the inception of the secondment period, Member and the Company have determined and set forth in Exhibit A each Seconded Employee’s current base
salary, which comprises only a portion of the total cost of a Seconded Employee. For expense planning purposes, by September 30 of each year and otherwise upon request of the Company, Member will provide a non-binding Seconded Employee cost
estimate for each Seconded Employee (the “Seconded Employee Cost Estimate”) for the next year. The sole purpose of the Seconded Employee Cost Estimate is to provide the Company with an estimated projection of future expenses
for inclusion in the Company’s annual budget. 

  

	 	2.5	Member and the Company Group shall each comply with all applicable national, state and local laws, regulations, and orders, including but not limited to national,
state, and local tax, social legislation, civil rights laws and any other employment-related laws, regulations and orders affecting, directly or indirectly, the Seconded Employees and each member of the Company Group shall be responsible for all
time-keeping records relating to hours worked. 

  
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	 	2.6	Member shall have the right and responsibility to terminate the Seconded Employees, to evaluate each Seconded Employee’s performance for performance management
purposes, and, in consultation with the Company, to determine the amount of compensation and benefits to be provided to the Seconded Employees. In consultation with the Company, Member may hire Replacement Employees to replace terminated Seconded
Employees or add Additional Employees for the Company Group’s staffing or expansions or additional projects. Member will amend Exhibit A to show those Replacement Employees or Additional Employees hired and those Seconded Employee
terminated. During the period of secondment to the Company Group, the Seconded Employees shall have no authority to enter into contracts or otherwise engage in any business transactions on behalf of Member. The Company will provide the Seconded
Employees with (i) a suitable workplace which complies with all applicable safety and health standards, statutes, and ordinances, (ii) all necessary information, training, and safety equipment with respect to hazardous substances, and
(iii) adequate instruction, assistance, direction, and time to perform the services requested of them during the period of their secondment to the Company Group. 

 

	 	2.7	Prior to the Employee Transfer Date, the Board of Directors or its designee shall select which, if any, of the Seconded Employees will be offered employment with the
Company Group as of the Employee Transfer Date in accordance with Section 2.1(i) of the Employee Transition Agreement. 

  

	 	2.8	All Seconded Employees will abide by the Company Group’s policies applicable to the Seconded Employees. In addition, all Seconded Employees will abide by
Member’s code of business conduct, its policies concerning business travel and confidential and proprietary information, and other similar Member policies applicable to the Seconded Employees. Any discipline of the Seconded Employees under any
Company Group policies or practices will be handled by mutual agreement of Member and the Company. 

  

	 	2.9	During the term of this Agreement, Member shall add the members of the Company Group as an additional insured under its applicable insurance policies.

  

	3.	PAYMENT OF COSTS FOR SECONDED EMPLOYEE SERVICES 

  

	 	3.1	The Company shall be obligated to reimburse Member for all Employment Costs incurred by Member in connection with Seconded Employees, regardless of whether specifically
listed in Exhibit B.  

  

	 	3.2	With respect to the equity-related compensation awards described in Sections 3.3(a) and 3.3(b) of the Employee Transition Agreement, the Company will reimburse Member
for the amount of expense recorded on Member’s financial statements with respect to such awards and relating to the period following the Effective Date. 

  
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	 	3.3	Member shall keep and maintain books and records in accordance with its standard accounting practices and procedures which books and records shall be sufficient to
enable an independent auditor to verify the accuracy of the costs billed by Member to the Company under the terms of this Agreement. 

  

	 	3.4	Except as otherwise provided in this Section 3, Member shall invoice the Company by the fifteenth (15th) workday of each calendar month for the Employment
Costs paid by Member during the prior month. Invoices shall be supported by appropriate documentation. For the protection of personal employee data, Employment Costs supporting details will be delivered only to the Company representative noted in
paragraph 12.2 below. 

  

	 	3.5	Invoices to the Company will be payable by wire transfer or other mutually agreed upon method of payment, within thirty (30) days from the date of invoice.

  

	 	3.6	If the Company has any questions or disagreement regarding the amount due under this Section 3, it shall provide Member with the nature and details of the dispute
within sixty (60) days after the date of invoice, after which time the Company will be deemed to have accepted all undisputed amounts included in such invoice, subject to the Company’s right to conduct an audit pursuant to Section 4.
The Parties shall then negotiate in good faith, each bringing forward supporting information. Such information is subject to audit and verification by the other Party. If the Parties resolve the dispute at this level, the resolution and agreed upon
action shall be documented for the Parties. 

 If the Parties cannot resolve the dispute, the matter shall be
escalated to the management of Member and the Company for review. If the dispute cannot be resolved to the satisfaction of the Parties at this level, the issue may be presented to senior officers of Member and the Board of Directors or its designee
for resolution. If the dispute involves an audit report or audit finding (which audit will be conducted and completed pursuant to, and in accordance with, Section 4), such audit will be made available to all members of the Board of Directors or
its designee. 
 The invoice amount not in dispute must be paid according to the terms of this Section 3, and only the
amount in dispute may be withheld subject to good business judgment and pending resolution of the dispute. 
  

	 	3.7	The Parties acknowledge that Member is a party to that certain Transition Services Agreement dated as of the Effective Date, pursuant to which Member provides certain
general and administrative services on behalf of the Company Group. Notwithstanding anything in this Agreement to the contrary, Member shall not be entitled to receive payment for the same services performed both hereunder and under such Transition
Services Agreement. 

  
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	4.	AUDITS 

  

	 	4.1	The Company, through its authorized representatives, upon fifteen (15) days’ advance notice in writing to Member, shall have the right to conduct and complete
an audit of the books and records of Member relating to the financial and operating activities (including contractors and vendors supplying materials and/or services to Member) hereunder for any calendar year, for the sole purpose of determining the
accuracy of the Seconded Employee costs billed to the Company, within twelve (12) months following the end of such calendar year, utilizing a third-party independent auditor acceptable to Member, which acceptance shall not be unreasonably
withheld; provided, however, that the Company may not exercise such right more than once every six (6) months. The complete audit report from such audits shall be made available to Member. The audit expense incurred under this
Section 4 shall be borne by the Company. 

  

	 	4.2	The auditor shall be subject to reasonable conditions of confidentiality which shall be provided to the independent auditor by Member and which independent auditor will
be required to sign prior to beginning the audit. The Company’s independent auditor and Member’s internal auditors shall cooperate with each other to facilitate an accurate and efficient audit. 

 

	5.	DISCLAIMER BY MEMBER 

 There are
no representations or warranties made by Member hereunder, express or implied, at law or in equity, with respect to the subject matter hereof. By way of example and not by way of limitation, Member does not warrant the quality or competence of any
of the Seconded Employees or that the secondments of the Seconded Employees will permit the Company Group to achieve any specific or general results, nor does Member, except as provided in Section 6 hereof, accept any obligation or liability
whatsoever for the acts, omissions and/or other performance of the Seconded Employees, and in no event shall Member be liable to the Company for special, indirect, incidental, consequential or punitive damages in respect thereof. 

 

	6.	INDEMNITIES 

  

	 	6.1	 Except as provided in paragraph 6.2, the Company shall defend, indemnify and hold harmless Member, its Subsidiaries and Affiliates (other than the
Company Group), and their respective officers, directors, employees and agents, from, against and with respect to any and all costs, lawsuits, proceedings, demands, assessments, penalties, fines, administrative orders, claims, losses, expenses,
liabilities, obligations, and damages (including without limitation reasonable attorneys fees, costs and expenses incidental thereto) which in any way arise out of, result from, or relate to (i) the acts, omissions and/or other performance of
services (including without limitation any negligent or intentional acts or omissions) by the Seconded Employees during periods from and after the Effective Date, (ii) any negligent or intentional act or omission on the part of the Company or
any member of the Company Group or their respective officers, 

  
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employees (including without limitation the Seconded Employees), or agents, (iii) any personal injury, death, or damage claim by, on behalf of, or related to a Seconded Employee to the
extent attributable to periods of time from and after the Effective Date, (iv) the Company’s or any member of the Company Group’s failure to comply with all applicable laws, including applicable labor and employment laws, regulations
or orders with respect to the Seconded Employees, or (v) any breach of this Agreement by the Company. 

  

	 	6.2	Member shall defend, indemnify and hold harmless the Company and the members of the Company Group and their respective officers, directors, employees and agents, from,
against and with respect to any and all costs, lawsuits, proceedings, demands, assessments, penalties, fines, administrative orders, claims, losses, expenses, liabilities, obligations, and damages (including without limitation reasonable attorneys
fees, costs and expenses incidental thereto) which in any way arise out of, result from, or relate to (i) any negligent or intentional act or omission on the part of Member, its officers or employees (excluding the Seconded Employees) or agents
which creates any violation of applicable labor or employment laws, (ii) any personal injury, death, or damage claim by, on behalf of, or related to a Seconded Employee to the extent attributable to periods of time prior to the Effective Date,
(iii) the Member’s or its Subsidiaries’ or Affiliates’ (other than the Group Members) failure to comply with all applicable laws, including applicable labor and employment laws, regulations or orders with respect to the Seconded
Employees, (iv) any claim, demand or cause of action which may be brought by any Seconded Employee or his or her heirs for personal injury to, or death of such Seconded Employee to the extent covered by Member’s statutorily required
workers compensation coverage or employer’s liability coverage applicable to such Seconded Employee and attributable to periods of time prior to the Employee Transfer Date, or (v) any breach of this Agreement by Member.

  

	 	6.3	Except as provided in paragraph 6.2, upon and after the Employee Transfer Date, the Company shall be solely responsible for (and shall defend, indemnify and hold
harmless Member, its Subsidiaries and Affiliates (other than the Company Group), and their respective officers, directors, employees and agents, from, against and with respect to) any and all costs, lawsuits, proceedings, demands, assessments,
penalties, fines, administrative orders, claims, losses, expenses, liabilities, obligations, and damages (including without limitation reasonable attorneys fees, costs and expenses incidental thereto) arising from or related to events occurring on
or after the Employee Transfer Date and that are related to the Seconded Employees who become employees of the Company Group. 

  

	 	6.4	 The Company and Member agree (i) to notify each other in writing of any asserted claim for indemnification pursuant to this Section 6 within
thirty (30) days of either discovery of the occurrence upon which the claim may be based or learning of such claim, whichever occurs first, and (ii) to permit Member or the Company, as the case may be, to defend the claim at the option of
the Party against whom the claim is asserted, with counsel acceptable to such Party, which 

  
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consent will not be unreasonably refused. Except with respect to workers compensation and employer’s liability claims, no Party will pay or agree to pay any asserted claim under this
Agreement without prior written approval from the Party against whom the claim is asserted, which approval will not be unreasonably withheld. 

  

	 	6.5	In the event that a Party is obligated to indemnify and hold another Party harmless under this Article 6, the amount owing to the indemnified Party will be reduced by
the amount of any insurance claims made or proceeds received by such indemnified Party under the policies described in Section 2.9. 

  

	 	6.6	THE FOREGOING INDEMNITIES ARE INTENDED TO BE ENFORCEABLE AGAINST THE PARTIES IN ACCORDANCE WITH THE EXPRESS TERMS AND SCOPE THEREOF NOTWITHSTANDING ANY EXPRESS
NEGLIGENCE RULE OR ANY SIMILAR DIRECTIVE THAT WOULD PROHIBIT OR OTHERWISE LIMIT INDEMNITIES BECAUSE OF THE SOLE, CONCURRENT, ACTIVE OR PASSIVE NEGLIGENCE, STRICT LIABILITY OR FAULT OF ANY OF THE INDEMNIFIED PARTIES. 

 

	7.	FORCE MAJEURE 

 No Party shall be
liable to the other Party hereto for its failure or delay in performing its obligations hereunder (other than its obligations to pay money) due to Force Majeure. “Force Majeure” means any labor dispute, including but not
limited to strikes, work stoppages, or slowdowns, (whether or not beyond the reasonable control of the affected Party) and other circumstances reasonably beyond the control of the affected Party, including, without limitation, acts of God, fire,
flood, war, terrorism, accident, explosion, breakdowns or embargoes or other import or export restrictions, shortage of or inability to obtain energy, equipment, transportation, products or good faith compliance with applicable law or any request
(whether ultimately valid or invalid) made by any governmental authority. 
  

	8.	CONFIDENTIALITY 

  

	 	8.1	 Member and the Company each acknowledge that during the term of this Agreement, the Seconded Employees may receive, or otherwise acquire, information
that the Party disclosing such information (the “Disclosing Party”) considers proprietary and confidential, or which the Disclosing Party is obligated to keep in confidence pursuant to an agreement with a third party. Except
as otherwise provided to the contrary in any general confidentiality agreements between Member and the Company, Member agrees to instruct the Seconded Employees to maintain any and all such proprietary and confidential information transmitted to
them as a result of the performance of services for the Company by the Seconded Employees or being present on the Disclosing Party’s premises, in strict confidence. All business and technical information received, developed, observed, or
otherwise acquired by the Seconded Employees, as a result of performing services for the Company, or being present at the Disclosing Party’s 

  
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premises, is presumed to be confidential. The obligations of confidence described in this paragraph 8.1 shall not apply to any information that (i) is known to the Seconded Employees prior
to the Seconded Employees’ acquiring such information, (ii) is or becomes known to the public through no fault of the Seconded Employees, (iii) the Seconded Employees are legally required by statute, subpoena, or other valid court
order, to disclose by a governmental agency or court having competent jurisdiction (provided that the Seconded Employee has given the Company written notice and the opportunities to contest such requirement). 

 

	 	8.2	Member and the Company will give the Seconded Employees an Employment Status and Information Non-Disclosure Notice substantially in the form of Exhibit C
attached to and made a part of this Agreement. 

  

	9.	WORK PRODUCT OWNERSHIP 

 Except
as otherwise provided to the contrary in any license or other similar agreements between Member and the Company, all rights of ownership applicable to any data, documents, information, inventions, and information-bearing media, generated, observed,
or discovered by the Seconded Employees, during the performance of services for the Company under this Agreement (the “Work Product”), shall belong solely to the Company, either by operation of the “work for hire”
doctrine, to the extent it is applicable, or by assignment from Member. In this regard, Member hereby assigns to the Company, its nominee, successor or assign, all rights, title and interest in and to such inventions, discoveries, improvements,
developments and other creative work, including both the United States and foreign rights that were conceived, discovered and/or made by a Seconded Employee solely or jointly with others while performing services for the Company or Company Group
relating to or connected with the business of the Company or its Subsidiaries. Member shall also execute, upon request by the Company, its nominee, successor, or assign any papers necessary or desirable to register a copyright, or apply for and
obtain a letter of patent from the United States or foreign countries, to maintain, enforce or defend any such copyrights or patents or other legal protection available to protect such inventions, discoveries, improvements, developments and all
other creative work, and to vest complete title to such patents, copyrights and other legal protection in the Company, its nominee, successor, or assign, including without limitation any papers relating to inferences, oppositions, conflicts,
re-issues, divisions, continuation-in-parts, or litigation relating to any such inventions, discoveries, improvements, developments, and all other creative work. Member shall retain no proprietary interest in such Work Product, or any patents,
copyrights, trade secrets or other intellectual property based on such Work Product. Under no circumstances shall such Work Product be conveyed, disclosed, released or exploited for the benefit of Member, its employees, or any third party without
the prior written consent of the Company. 

  
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	10.	TERM AND TERMINATION 

  

	 	10.1	The term of this Agreement shall begin on the Effective Date and end on the last Employee Transfer Date of any Seconded Employee covered by this Agreement, unless
sooner terminated by either Party pursuant to paragraph 10.2. 

  

	 	10.2	The Company may terminate this Agreement upon ninety (90) days’ written notice to OGE. Either Party may terminate this Agreement immediately upon notice to
the other in the event that: (i) the Parties mutually agree to do so; (ii) the other Party materially breaches the Agreement and fails to cure such material breach within ninety (90) days following written notice of such breach; or
(iii) the other Party becomes insolvent. 

  

	 	10.3	If this Agreement is terminated, the Parties agree to promptly negotiate in good faith to determine the amount of Employment Costs for which Member has not received
reimbursement. Any amount owing to Member shall be paid within fourteen (14) days of the reconciliation of the Employment Costs as described above, or within thirty (30) days of the effective date of the termination, whichever is later.

  

	11.	RELATIONSHIP OF THE PARTIES 

  

	 	11.1	Nothing in this Agreement shall create or be deemed to create a partnership, joint venture, agency, or any other relationship between the parties or otherwise alter the
independent contractor relationship of the parties, except as expressly set forth in this Agreement. No prior course of dealing between Member and the Company shall be of any affect to modify in any respect either Party’s status under this
Agreement as an independent contractor. 

  

	 	11.2	For the period beginning on the Effective Date and ending on the date that is two years after the Effective Date, OGE and its Affiliates shall not, in any manner
directly or indirectly or by assisting another person, unless acting in accordance with the Company’s prior written consent, solicit for employment or other similar relationship, or hire, any Transferred Employee, other than such employee who
(i) independently responded to a general solicitation for employment not directed at such employee or (ii) is a bona fide referral to OGE or its Subsidiary or Affiliates by a professional search firm. 

 

	12.	MISCELLANEOUS 

  

	 	12.1	Neither Party may assign or otherwise transfer its rights or delegate or otherwise transfer its obligations hereunder without the prior written consent of the other
Party hereto, which consent shall not be unreasonably withheld. Any attempted assignment or transfer in violation hereof shall be void. 

  
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	 	12.2	Any notice or request specifically provided for or permitted to be given under this Agreement must be in writing and may be delivered by hand delivery, mail, courier
service or facsimile, and shall be deemed effective as of the time of actual delivery thereof to the addressee (except that any notice by facsimile received after the close of business of the recipient shall be deemed received the next business
day). For purposes of notice, the address of the parties shall be as follows: 

 If to Member, addressed to:

 OGE Enogex Holdings LLC 
 321 North Harvey 
 P.O. Box 321 

Oklahoma City, Oklahoma 73101-0321 
 Attention: Sean Trauschke 
 Fax: (405) 553-3760 

with a copy to: 

Jones Day 
 717
Texas Avenue, Suite 3300 
 Houston, Texas 77002 
 Attention: James E. Vallee 
 Fax: (832) 239-3600 

If to the Company, addressed to: 
 CenterPoint Energy, Inc. 
 1111 Louisiana Street 

Houston, Texas 77002 
 Attention: Chief Financial Officer 
 Fax: (713)-207-9680 

with a copy to: 

Baker Botts L.L.P. 
 910 Louisiana Street 
 Houston, Texas 77002 

Attention: David Kirkland 
 Fax: (713) 229-1522 
 and 

OGE Enogex Holdings LLC 
 321 North Harvey 
 P.O. Box 321 

Oklahoma City, Oklahoma 73101-0321 
 Attention: Sean Trauschke 
 Fax: (405) 553-3760 

  
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 with a copy to: 
 Jones Day 
 717 Texas Avenue, Suite 3300 

Houston, Texas 77002 
 Attention: James E. Vallee 
 Fax: (832) 239-3600 

Each Party named above may change its address and that of its representative for notice by giving of notice thereof in the manner
hereinabove provided. 
  

	 	12.3	Seconded Employees are at-will employees. Nothing in this Agreement shall be construed as an employment contract or as creating any contractual obligation enforceable
by any individual Seconded Employee against any of Member, the Company, a member of the Company Group or any Affiliate of them, or prevent Member or the Company from making decisions regarding the continued employment of any individual by Member or
the Company during or after that Seconded Employee’s period of secondment to the Company under this Agreement. 

  

	 	12.4	No change in, modification of, addition to or waiver of any of the terms and conditions of this Agreement shall be effected by the acknowledgment or acceptance of
requests containing additional or different terms and conditions. No waiver of any of the provisions hereof shall be effective unless in writing and signed by the Party against whom asserted and no waiver made shall bind either Party to a waiver of
any succeeding breach of the same or any other provisions hereof. 

  

	 	12.5	The provisions of Section 10.2 (Governing Law; Jurisdiction; Waiver of Jury Trial) of the Master Formation Agreement shall apply to this Agreement as if fully set
forth herein and shall survive any termination or expiry of such agreement. 

  

	 	12.6	The headings and captions to the Sections and paragraphs of this Agreement have been inserted for convenience of reference only and shall not affect or be deemed to
affect the construction of this Agreement. 

  

	 	12.7	If any provision of this Agreement is held invalid, such invalidity shall not affect other provisions of this Agreement. To the extent reasonably possible, the parties
agree to promptly negotiate in good faith to cure any invalid provision consistent with the intent and spirit of this Agreement. 

  

	 	12.8	In the event of termination or expiry of this Agreement pursuant to paragraphs 10.1 or 10.2, Section 3 (Payment of Costs for Seconded Employees Services),
Section 6 (Indemnities), Section 8 (Confidentiality), and Section 9 (Work Product Ownership) shall survive. 

  

	 	12.9	This Agreement may be executed in multiple counterparts which shall be deemed an original and all of which shall constitute one instrument. 

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

									
	CENTERPOINT ENERGY FIELD SERVICES LP	  		  	OGE ENERGY CORP.
	By:	 	CNP OGE GP LLC,	  		  		  	
		 	Its General Partner	  		  		  	
					
	By:	 	 /s/ David M. McClanahan
	  		  	By:	  	 /s/ Sean Trauschke

	Name: David M. McClanahan	  		  	Name: Sean Trauschke
	Title: Interim Chairman	  		  	Title: Vice President and Chief Financial Officer
		 		  		  		  	

 EXHIBIT B 
 EMPLOYMENT COSTS 
 Pursuant to paragraph 3.1 of the Agreement, the Employment Costs to be
reimbursed by the Company to Member shall include, but not be limited to, the following specified costs for each Seconded Employee: 
  

	 	•	 	 Compensation 

  

	 	•	 	 Base salary or wages 

  

	 	•	 	 Overtime, shift premium, and other similar payments 

  

	 	•	 	 All short and long-term incentive compensation, such as performance awards, incentive awards or sales commissions 

 

	 	•	 	 Cost of Living Allowance (COLA) 

  

	 	•	 	 Reimbursement of business expenses, including travel and entertainment, incurred in carrying out work under the direction of the Company.

  

	 	•	 	 Member’s share of federal, state and local taxes incurred with respect to each Seconded Employee. 

 

	 	•	 	 Member’s share of all employee retirement, welfare and fringe benefits costs, including but not limited to: 

 

	 	•	 	 Medical 

  

	 	•	 	 Dental 

  

	 	•	 	 Prescription drugs 

  

	 	•	 	 Vision 

  

	 	•	 	 Pension and non-qualified excess plans (SERPs) 

  

	 	•	 	 Post-retirement benefits affecting secondment period 

  

	 	•	 	 Employer matching and other contributions to savings plan programs such as 401(k) plans, non-qualified excess benefits plans (SERPs) and deferred
compensation plans 

  

	 	•	 	 Group travel insurance 

  

	 	•	 	 Group life insurance 

  

	 	•	 	 Long term disability insurance 

  

	 	•	 	 Long term care 

  

	 	•	 	 Employee assistance plan 

  

	 	•	 	 Educational reimbursement expense 

  

	 	•	 	 Any and all Seconded Employee relocation costs, both at the commencement and conclusion of assignment, including but not limited to:

  
 B-1

	 	•	 	 House Hunting Trip 

  

	 	•	 	 Travel, including the final move 

  

	 	•	 	 Loss on Home Sale 

  

	 	•	 	 Any Home Sale Bonus 

  

	 	•	 	 Guarantee House Purchase 

  

	 	•	 	 Any Lump Sum Payments 

  

	 	•	 	 Temporary Living Expenses 

  

	 	•	 	 Move Day Expenses 

  

	 	•	 	 Household goods movement and storage Costs 

  

	 	•	 	 Goods Shipment Cost to/from Member to the Company 

  

	 	•	 	 Home Sales Assistance 

  

	 	•	 	 Duplicate Housing Expenses 

  

	 	•	 	 All Cancellation Expenses 

  

	 	•	 	 Home Buying Expenses 

  

	 	•	 	 Rental/Leasing Assistance 

  

	 	•	 	 High Cost Assistance 

  

	 	•	 	 Career Assistance for Spouses 

  

	 	•	 	 Miscellaneous Relocation Moving Costs Allowance 

  

	 	•	 	 All direct costs of any claim, demand or cause of action which may be brought by any Seconded Employee or his or her heirs for personal injury to, or
death of such Seconded Employee during the term of this Agreement, or for any employment-related claims that relate to conduct during the term of this Agreement, including, but not limited to, costs under Member’s workers compensation insurance
coverage and which are (i) attributable to personal injury or death of such Seconded Employee during the term of this Agreement and (ii) are a direct obligation of Member or are subject to reimbursement by Member to any third party claim
administrator or insurer, including third party claim administrator claim management costs and other costs incurred in the management and defense of any such claim, demand, or cause of action. Costs, however, do not include costs which are fully
insured and which are not a direct obligation of Member or subject to reimbursement by Member. 

  

	 	•	 	 All other direct costs relating to the continuing employer-employee relationship, such as workers’ compensation and unemployment compensation
premiums, payments to employees or claims cost and any taxes imposed on Member by any governmental authority on account of the Seconded Employee. 

  
 B-2

 EXHIBIT C 
 Employment Status and Information Non-Disclosure Notice 
 As you know, OGE
Energy Corp., an Oklahoma corporation (“OGE”), CenterPoint Energy, Inc. (“CNP”) and affiliates of Arclight Capital Partners, LLC, entered into an agreement that resulted in the formation of CenterPoint
Energy Field Services LP (the “Company”). In connection with the agreement, OGE and CNP agreed to assign some of their employees and the employees of their respective affiliated companies (“Assigned
Employees”) to the Company for the purpose of assisting the Company in its operations and allowing the Company adequate time to develop, among other things, compensation and benefits for its own employees. This assignment is expected to
end not later than December 31, 2014, subject to extension by agreement of OGE and CNP. 
 Because you are among those
Assigned Employees whom OGE and CNP have provided to the Company to assist the Company during this transition period, it is important that you read this Employment Status and Information Non-Disclosure Notice (this “Notice”).
For purposes of simplicity, your current employer, whether it is OGE, CNP or one of their affiliated companies, will be referred to in this Notice as your “Member Company.” 

 

	1.	Employment Status. 

 In
its agreement with OGE and CNP, the Company agreed to give notice to the Assigned Employees concerning various aspects of their employment during the temporary period in which they are assigned by their Member Company to provide services for the
Company. Accordingly, please take notice of the following facts concerning your assignment: 
  

	 	•	 	 Your Member Company may assign you to provide services to the Company. While providing such services to the Company, you will remain an employee of
your Member Company. However, you will be given assignments by the Company and be subject to the instruction of the Company as to certain aspects of the details, means, and methods of performing such assignments. 

 

	 	•	 	 While assigned by your Member Company to provide services to the Company, you must comply with all the Company rules, policies, and related orders
and/or requests including without limitation those relating to alcohol, drugs, safety, security, smoking, controlled substances, and weapons. 

  

	 	•	 	 While assigned to the Company, you will remain on the payroll of your Member Company, and you will be covered by Workers’ Compensation insurance
maintained by your Member Company for the benefit of your Member Company and the Company. The responsibility, if any, of the Company for injuries or death will be limited to benefits available from your Member Company under applicable workers’
compensation laws. 

  

	 	•	 	 While you are assigned to provide services to the Company, you will participate in the benefits plans, programs, and policies of your Member Company,
to the extent that you are eligible, and you will not be eligible to participate in or be eligible for any benefits or rights under the Company’s benefit plans, programs, or policies, if any. 

  
 C-1

	2.	Information Non-Disclosure. 

 The agreements between the Company and OGE and CNP require that you be given notice of your obligations concerning the nondisclosure of certain information. From time to time, you may have access to the
Company’s confidential information, including information previously acquired by (i) OGE or its affiliated companies with respect to the OGE businesses and operations and research, development, and demonstration activities related
primarily thereto and (ii) CNP or its affiliated companies with respect to the CNP businesses and operations and research, development, and demonstration activities related primarily thereto. You will keep confidential and refrain from
disclosing such confidential information, without the Company’s prior written permission, to any party other than the Company’s employees, officers and representatives, or use such confidential information in a manner inconsistent with
your assignments. 
 Your obligations of non-disclosure and non-use contained herein, however, do not apply to:
(i) information which at the time of disclosure is, or subsequently becomes, published or generally known from a source other than you; (ii) information that you can demonstrate was in your possession prior to the date of your assignment
to the Company other than through your employment with your Member Company or any companies affiliated with your Member Company, and which was not acquired, directly or indirectly, from the Company, your Member Company, or any companies affiliated
with your Member Company; or (iii) information that you can demonstrate was lawfully received by you from a third party after the time of disclosure hereunder and which third party did not require you to hold in confidence. 

Information that is specific to a Company process or job assignment is not deemed to be in the public knowledge or literature or in your
possession merely because it is embraced in general disclosures in the public knowledge or literature. 
 Confidential
information includes business, technical, or financial information and other work product that is developed by you during your employment with your Member Company or its affiliated companies, and that the ownership and rights to use such information
are governed by the contractual relationships between OGE and the Company and CNP and the Company. 
  

	3.	At-Will Employment Status. 

Your Member Company and the Company are at-will employers. As such, your employment with your Member Company is on an employment-at-will
basis, and future employment, if any, with the Company, will be on an employment-at-will basis, which may be terminated by your employer at any time, and the Company may at any time discontinue your assignment to provide it services. Neither your
status as an Assigned Employee nor this Notice is a contract of employment, nor does either alter your employment-at-will status with your Member Company. 

  
 C-2EX-10.12

 Exhibit 10.12 
 EXECUTION VERSION 
 REGISTRATION RIGHTS AGREEMENT 

This REGISTRATION RIGHTS AGREEMENT (this “Agreement”) is made and entered into as of May 1, 2013, by and among
CenterPoint Energy Field Services LP, a Delaware limited partnership (the “Partnership”), CenterPoint Energy Resources Corp., a Delaware corporation (“CERC”), OGE Enogex Holdings LLC, a Delaware limited liability
company (“OGEH”), and Enogex Holdings LLC, a Delaware limited liability company (“Bronco”). CERC, OGEH and Bronco are referred to collectively herein as the “Initial Holders.” The Partnership and
the Initial Holders are referred to collectively herein as the “Parties.” 
 WHEREAS, the Initial Holders have
acquired, and may (together with their respective Affiliates) acquire in the future, certain Registrable Securities; and 

WHEREAS, as an inducement to the willingness of the Initial Holders to hold certain Registrable Securities, the Parties desire to provide
certain registration rights to the Initial Holders with respect to any Registrable Securities held by them or their Affiliates upon the terms and subject to the conditions set forth herein. 

NOW, THEREFORE, IN CONSIDERATION of the mutual covenants and agreements contained in this Agreement, and for other good and valuable
consideration, the receipt and adequacy of which are hereby acknowledged, the Parties hereby agree as follows: 
 1.
Definitions. 
 (a) As used in this Agreement, the following terms shall have the respective meanings set forth in
this Section 1: 
 “Adverse Disclosure” means public disclosure of material non-public information relating
to a significant transaction, which disclosure (i) would be required to be made in any Registration Statement filed with the Commission by the Partnership so that such Registration Statement would not contain any untrue statement of a material
fact or omit to state any material fact required to be stated therein or necessary to make the statements therein not misleading; (ii) would not be required to be made at such time but for the filing of such Registration Statement; and
(iii) would, in the good faith judgment of the Partnership’s Board of Directors, have a material adverse effect upon the Partnership’s ability to complete such significant transaction or upon the terms on which such significant
transaction could be completed. 
 “Affiliate” has the meaning set forth in the Partnership Agreement.

 “Agreement” has the meaning set forth in the preamble. 

“Automatic Shelf Registration Statement” means an “automatic shelf registration statement” as defined under
Rule 405. 
 “Board of Directors” has the meaning set forth in the Partnership Agreement. 

“Bronco” has the meaning set forth in the preamble. 

 “Business Day” has the meaning set forth in the Partnership Agreement.

 “CERC” has the meaning set forth in the preamble. 

“CERC Contribution Agreement” has the meaning set forth in the Master Formation Agreement. 

“CNP” means CenterPoint Energy, Inc., a Texas corporation. 

“CNP Services Agreement” has the meaning set forth in the Master Formation Agreement. 

“CNP Transitional Seconding Agreement” has the meaning set forth in the Master Formation Agreement. 

“Commission” means the Securities and Exchange Commission. 

“Common Units” has the meaning set forth in the Partnership Agreement. 

“Conflicts Committee” has the meaning set forth in the Partnership Agreement. 

“Delaying Event” means a significant negative development in the capital markets conditions that causes the Board of
Directors, in good faith, to conclude that the consummation of an Initial Public Offering would have a material adverse effect on the Partnership. 
 “Demand Notice” has the meaning set forth in Section 2(b)(ii). 
 “Demand Registration” has the meaning set forth in Section 2(b)(ii). 
 “Effective Date” means the time and date that a Registration Statement is first declared effective by the Commission or otherwise becomes effective. 

“Effectiveness Period” has the meaning set forth in Section 2(b)(iii). 

“EH II LLC Agreement” has the meaning set forth in the Master Formation Agreement. 

“EH Contribution Agreement” has the meaning set forth in the Master Formation Agreement. 

“Employee Transition Agreement” has the meaning set forth in the Master Formation Agreement. 

“Exchange Act” means the Securities Exchange Act of 1934, as amended. 

“Filing Date” means the date that an IPO Registration Statement is filed with the Commission (or, if applicable,
submitted to the Commission confidentially). 
 “General Partner” has the meaning set forth in the Partnership
Agreement. 

  
 2 

 “General Partner Interest” has the meaning set forth in the Partnership
Agreement. 
 “GP LLC Agreement” has the meaning set forth in the Master Formation Agreement. 

“Group Member” has the meaning set forth in the Partnership Agreement. 

“Holder” means (i) any Initial Holder who holds Registrable Securities; or (ii) any holder of Registrable
Securities to whom the registration rights conferred by this Agreement have been transferred in compliance with Section 9(g) hereof. 
 “Incentive Distribution Right” has the meaning set forth in the Partnership Agreement. 
 “Indemnified Persons” has the meaning set forth in Section 6(a). 
 “Initial Bronco Amount” has the meaning set forth in the Partnership Agreement. 
 “Initial Holders” has the meaning set forth in the preamble. 

“Initial Public Offering” means the registration by the Partnership of any Partnership Interests, including Common
Units, pursuant to a Registration Statement that is filed and declared effective under the Securities Act. 

“Initiating Holder” has the meaning set forth in Section 2(b)(ii). 

“IPO Date” means the pricing of the first sale of Common Units in the Initial Public Offering. 

“IPO Filing Deadline” means the first anniversary of the date of this Agreement. 

“IPO Registration” has the meaning set forth in Section 2(a)(i). 

“IPO Registration Statement” has the meaning set forth in Section 2(a)(i). 

“Lock-Up Period” has the meaning set forth in Section 3(o). 

“Losses” has the meaning set forth in Section 6(a). 

“Master Formation Agreement” means that certain Master Formation Agreement dated as of March 14, 2013 among CNP,
OGE, Bronco Midstream Holdings, LLC, a Delaware limited liability company, and Bronco Midstream Holdings II, LLC, a Delaware limited liability company, and to which the General Partner, the Partnership and Bronco are bound, as it may be further
amended, supplemented or restated from time to time. 
 “OGE” means OGE Energy Corp., an Oklahoma corporation.

 “OGE Services Agreement” has the meaning set forth in the Master Formation Agreement. 

  
 3 

 “OGE Transitional Seconding Agreement” has the meaning set forth in the
Master Formation Agreement. 
 “OGEH” has the meaning set forth in the preamble. 

“Omnibus Agreement” has the meaning set forth in the Master Formation Agreement. 

“Parties” has the meaning set forth in the preamble. 

“Partnership” has the meaning set forth in the preamble. 

“Partnership Agreement” means the First Amended and Restated Agreement of Limited Partnership of the Partnership, dated
as of the date hereof, as it may be further amended, supplemented or restated from time to time. 
 “Partnership
Group” has the meaning set forth in the Partnership Agreement. 
 “Partnership Interest” has the
meaning set forth in the Partnership Agreement. 
 “Person” has the meaning set forth in the Partnership
Agreement. 
 “Piggyback Notice” has the meaning set forth in Section 2(c)(i). 

“Piggyback Registration” has the meaning set forth in Section 2(c)(i). 

“Piggyback Request” has the meaning set forth in Section 2(c)(i). 

“Proceeding” means any action, claim, suit, proceeding or investigation (including a preliminary investigation or
partial proceeding, such as a deposition) pending or known to the Partnership to be threatened. 
 “Prospectus”
means the prospectus included in a Registration Statement (including a prospectus that includes any information previously omitted from a prospectus filed as part of an effective Registration Statement in reliance upon Rule 430A, Rule 430B
or Rule 430C promulgated under the Securities Act), as amended or supplemented by any prospectus supplement, with respect to the terms of the offering of any portion of the Registrable Securities covered by a Registration Statement, and all
other amendments and supplements to the Prospectus, including post-effective amendments, and all information incorporated by reference or deemed to be incorporated by reference in such Prospectus. 

“Registrable Securities” means any Partnership Interest other than the General Partner Interest and the Incentive
Distribution Rights; provided, however, that “Registrable Securities” shall not include any such securities (i) that have been sold or disposed of in accordance with an effective Registration Statement covering such
Registrable Securities; (ii) are held by any Group Member; (iii) that have been sold or disposed of in accordance with Rule 144; or (iv) that have been sold or disposed of in a private transaction in which the registration rights
conferred by this Agreement have not been transferred in compliance with Section 9(g) hereof. 

  
 4 

 “Registration Expenses” has the meaning set forth in Section 5.

 “Registration Statement” means a registration statement in the form required to register the sale or resale
of the Registrable Securities under the Securities Act, and including any Prospectus, amendments and supplements to each such registration statement or Prospectus, including pre- and post-effective amendments, all exhibits thereto, and all
information incorporated by reference or deemed to be incorporated by reference in such registration statement (other than a registration statement relating solely to an employee benefit plan, an offering relating to a transaction on Form S-4 or an
offering on any registration statement form that does not permit secondary sales). 
 “Rule 144”, “Rule
158”, “Rule 405”, “Rule 415”, “Rule 424”, “Rule 430A”, “Rule 430B” and “Rule 430C” mean, in each case, such rule promulgated by the
Commission pursuant to the Securities Act, as such rule may be amended from time to time, or any similar rule or regulation hereafter adopted by the Commission having substantially the same effect as such rule. 

“Securities Act” means the Securities Act of 1933, as amended. 

“Selling Expenses” means all underwriting discounts, selling commissions and stock transfer taxes applicable to the sale
of Registrable Securities and, except as provided herein, fees and disbursements of counsel or any other advisor for any Holder. 
 “Selling Holder” means a Holder who is selling Registrable Securities pursuant to the procedures set forth herein. 

“Shelf Registration Statement” means a “shelf” Registration Statement providing for the registration of, and
the sale on a continuous or delayed basis by the Holders, of the Registrable Securities pursuant to Rule 415. 

“Sponsor Party” has the meaning set forth in the Partnership Agreement. 

“Sponsor Party Demand Notice” has the meaning set forth in Section 2(b)(i). 

“Sponsor Party Demand Registration” has the meaning set forth in Section 2(b)(i). 

“Sponsor Party Holder” means each of CERC and OGEH and any holder of Registrable Securities to whom the
registration rights conferred by this Agreement have been transferred by CERC or OGEH in compliance with Section 9(g) hereof. 
 “Sponsor Party Initiating Holder” has the meaning set forth in Section 2(b)(i). 
 “Suspension” has the meaning set forth in Section 2(d)(iv). 

“Trading Market” means the principal national securities exchange on which the Common Units are or will be listed or
admitted to trading, as determined by the Board of Directors. 

  
 5 

 “Transaction Documents” means, collectively, the Master Formation
Agreement, the CERC Contribution Agreement, the CNP Services Agreement, the CNP Transitional Seconding Agreement, the Employee Transition Agreement, the EH II LLC Agreement, the GP LLC Agreement, the OGE Services Agreement, the OGE Transitional
Seconding Agreement, the Omnibus Agreement, the Partnership Agreement, the Letter Agreement re: Initial Budget and the EH Contribution Agreement. 
 “WKSI” means a “well known seasoned issuer” as defined under Rule 405. 
 (b) The following rules of construction will govern the interpretation of this Agreement: (i) “days,” “months,” and “years” will mean calendar days, months and years
unless otherwise indicated; (ii) “include,” “includes” and “including” shall be deemed to be followed by the words “without limitation”; (iii) article and section titles do not affect interpretation;
(iv) “hereof,” “herein,” and “hereunder” and words of similar meaning refer to this Agreement as a whole and not to any particular provision of this Agreement; (v) “$” means United States dollars;
and (vi) the schedules and annexes attached to this Agreement are hereby incorporated by reference into this Agreement and form part hereof. 
 (c) The Parties have participated jointly in the negotiation and drafting of this Agreement. No provision of this Agreement will be interpreted in favor of, or against, any of the Parties by reason of the
extent to which any such Party or its counsel participated in the drafting thereof or by reason of the extent to which any such provision is inconsistent with any prior draft of this Agreement, and no rule of strict construction will be applied
against any Party. This Agreement will not be interpreted or construed to require any Person to take any action, or fail to take any action, if to do so would violate any applicable law. 

2. Registration. 
 (a) Registration. 
 (i) As soon as practicable following the date of this
Agreement, but in any event prior to the IPO Filing Deadline, the Partnership shall prepare and file with the Commission a Registration Statement (an “IPO Registration Statement”) on Form S-1 (or any appropriate registration form
under the Securities Act selected by the Partnership) for an Initial Public Offering (“IPO Registration”). 

(ii) Subject to Section 2(c)(ii), (A) the Holders shall be permitted to include for registration in the IPO Registration
Statement, on the same terms and conditions as the primary Common Units proposed to be offered and sold for the account of the Partnership, the number of Registrable Securities as they may request and (B) if the Initial Public Offering
contemplates an “over-allotment option,” Bronco shall be permitted to include in such over-allotment option a number of Registrable Securities held by Bronco up to 100% of the securities subject to such over-allotment option. Bronco’s
rights for inclusions of its Registrable Securities in the Initial Public Offering shall have priority over the inclusion of securities of any Sponsor Party. 

  
 6 

 (iii) The Partnership shall use reasonable best efforts to cause the IPO Registration
Statement to become effective under the Securities Act and to consummate the Initial Public Offering (including registering the Common Units under the Exchange Act and causing the Common Units to be listed on the Trading Market) as promptly as
reasonably practicable, but (except in the case of a Delaying Event as set forth in Section 2(a)(iv)) not later than 180 days following the Filing Date. 
 (iv) Notwithstanding any other provision of this Section 2(a), the Partnership shall not be required to consummate an Initial Public Offering pursuant to this Section 2(a) for so long as a
Delaying Event has occurred and is determined to be continuing, provided that the Delaying Event shall not delay the consummation of the Initial Public Offering for more than 90 days past the IPO Filing Deadline, without the prior written consent of
Bronco (which shall not be unreasonably withheld). To exercise an extension due to a Delaying Event, the General Partner shall provide to Bronco a certificate executed by a senior executive officer of the General Partner stating that the Board of
Directors has determined in good faith that a Delaying Event has occurred. Once the Delaying Event no longer exists, the Partnership shall use reasonable best efforts to promptly cause the IPO Registration Statement to become effective. During the
extended period caused by the Delaying Event, the Partnership shall use reasonable best efforts to continue to update the IPO Registration Statement and work with the Commission so that the IPO Registration Statement can be declared effective
promptly upon the expiration of the extended period. 
 (b) Demand Registration Rights. 

(i) Demand Registrations of Sponsor Party Holders. At any time following the date that is 180 days after the IPO Date, any Sponsor
Party Holder that holds Registrable Securities (the “Sponsor Party Initiating Holder”) shall have the option and right, exercisable by delivering a written notice to the Partnership (a “Sponsor Party Demand
Notice”), to require the Partnership to, pursuant to the terms of and subject to the limitations contained in this Agreement, prepare and file with the Commission a Registration Statement registering the offering and sale of all or any
portion of such Sponsor Party Holder’s Registrable Securities, which may, at the option of the Initiating Holder, be a Shelf Registration Statement (the “Sponsor Party Demand Registration”). 

(ii) Demand Registrations of Bronco. At any time following the date that the Partnership is first eligible to file a registration
statement under Form S-3 (or any equivalent or successor form under the Securities Act), Bronco, for as long as it holds Registrable Securities (together with any Sponsor Party Initiating Holder, an “Initiating Holder”), shall have
the option and right, exercisable by delivering a written notice to the Partnership (together with a Sponsor Party Demand Notice, a “Demand Notice”), to require the Partnership to, pursuant to the terms of and subject to the
limitations contained in this Agreement, prepare and file with the Commission a Registration Statement registering the offering and sale of all or any portion of Bronco’s Registrable Securities, which may, at the option of Bronco, be a Shelf
Registration Statement (an “Bronco Demand Registration” and, together with a Sponsor Party Demand Registration, a “Demand Registration”). 
 (iii) Within ten Business Days of the receipt of the Demand Notice, the Partnership shall give written notice of such Demand Notice to all other Holders that hold the same class of securities as the
Registrable Securities and shall, subject to the limitations of this 

  
 7 

 
Section 2(b), use reasonable best efforts to file a Registration Statement covering all of the Registrable Securities that such Holders shall in writing request (such request to be given to
the Partnership within ten Business Days of written receipt of such notice of the Demand Notice given by the Partnership pursuant to this Section 2(b)(iii)) to be included in such Demand Registration as promptly as reasonably practicable as
directed by the Initiating Holder in accordance with the terms and conditions of the Demand Notice and use reasonable best efforts to cause such Registration Statement to become effective under the Securities Act and remain effective under the
Securities Act for not less than six months following the Effective Date or such longer period ending when all Registrable Securities covered by such Registration Statement have been sold (the “Effectiveness Period”). 

(iv) Subject to the other limitations contained in this Agreement, the Partnership shall not be obligated hereunder to effect more than
(A) one Demand Registration pursuant to Section 2(b)(ii) in any 12-month period, (B) three Demand Registrations on Form S-3 (or any equivalent or successor form under the Securities Act) pursuant to Section 2(b)(i) or
(C) two Demand Registrations on Form S-3 (or any equivalent or successor form under the Securities Act) pursuant to Section 2(b)(ii). 
 (v) Notwithstanding any other provision of this Section 2(b), the Partnership shall not be required to effect a registration or file a Registration Statement pursuant to this Section 2(b):
(A) during the period starting with notice to the Holder of the intent to file a Registration Statement under Sections 2(b)(iii) or 2(c)(i) (which shall occur no earlier than 60 days prior to a good faith estimate, with the approval of the
Board of Directors, of the date of filing of such Registration Statement) and ending on a date 90 days after the effective date of, a Partnership-initiated registration; provided that the Partnership uses reasonable best efforts to cause such
registration statement to become effective; (B) for a period of up to 90 days after the date of a Demand Notice for registration pursuant to this Section 2(b) if at the time of such request the Partnership is currently engaged in a
self-tender or exchange offer and the filing of a Registration Statement would cause a violation of the Exchange Act; or (C) for a period of up to 90 days, if the Conflicts Committee, proceeding in good faith, determines that the filing of a
Registration Statement would require an Adverse Disclosure; provided, that, in such event, the Holders requesting such Demand Registration may withdraw such request and, if withdrawn, such request will not count as one of the permitted Demand
Registrations hereunder and the Partnership will pay all expenses (including reasonable attorneys fees) in connection with such registrations; provided, further, that the Partnership may delay a Demand Registration hereunder only once in any 12
month period. 
 (vi) Notwithstanding any other provision of this Section 2(b), if (A) the Holders intend to distribute
the Registrable Securities covered by a Demand Registration by means of an underwritten public offering and (B) the managing underwriter or managing underwriters of such offering advise the Partnership in writing that, in their opinion, the
inclusion of all of such Holders’ Registrable Securities in the subject Registration Statement would have a material adverse effect on the marketability of the offering, then the Partnership shall so advise all Holders of such Registrable
Securities that would otherwise be underwritten pursuant hereto, and the number of Registrable Securities that may be included in the underwriting shall be reduced to equal the number of Registrable Securities that such managing underwriter or
managing underwriters advise the Partnership can be sold without having such material adverse 

  
 8 

 
effect. The aggregate number of Registrable Securities to be included in such Demand Registration as a result of the reduction described in the immediately preceding sentence shall be (A) in
the case of a Sponsor Party Demand Registration, reduced pro rata among the Holders seeking to include their Registrable Securities in the underwriting, based, for each such Holder, on the percentage derived by dividing (x) the number of
Registrable Securities owned by such Holder by (y) the total number of Registrable Securities owned by all the Holders seeking to include their Registrable Securities in the underwriting, or (B) in the case of a Bronco Demand Registration,
allocated first to Bronco based on the number of Registrable Securities proposed to be sold by Bronco. If there remains availability for additional Registrable Securities to be included in such Bronco Demand Registration, the aggregate number of
Registrable Securities to be included in such Bronco Demand Registration shall be allocated among the Holders other than Bronco seeking to include their Registrable Securities in the underwriting on a pro rata basis based on the percentage derived
by dividing (x) the number of Registrable Securities owned by such Holder by (y) the total number of Registrable Securities owned by such other Holders (excluding Bronco) seeking to include their Registrable Securities in the underwriting.
Any Registrable Securities excluded or withdrawn from such underwriting shall be withdrawn from the registration. 
 (vii) The
Partnership may include in any such Demand Registration other Partnership securities for sale for its own account or for other Holders as provided herein; provided that if the managing underwriter for the offering determines that the number
of securities proposed to be offered in such offering would have a material adverse effect on the marketability of such offering, then the Registrable Securities to be sold by the Holders shall be included in such registration before any Partnership
securities proposed to be sold for the account of the Partnership or any other Person. 
 (viii) Subject to the limitations
contained in this Agreement, the Partnership shall effect any Demand Registration on Form S-3 (except if the Partnership is not then eligible to register for resale the Registrable Securities on Form S-3, in which case such Demand Registration shall
be effected on another appropriate form for such purpose pursuant to the Securities Act) and if the Partnership becomes, and is at the time of its receipt of a Demand Notice, a WKSI, the Demand Registration for any offering and selling of
Registrable Securities through a firm commitment underwriting shall be effected pursuant to an Automatic Shelf Registration Statement, which shall be on Form S-3 or any equivalent or successor form under the Securities Act (if available to the
Partnership). 
 (ix) Without limiting Section 3, in connection with any Demand Registration pursuant to and in accordance
with this Section 2(b), the Partnership shall (A) promptly prepare and file or cause to be prepared and filed: (1) such additional forms, amendments, supplements, prospectuses, certificates, letters, opinions and other documents, as
may be necessary or advisable to register or qualify the securities subject to such Demand Registration, including under the securities laws of such states as the Holders shall reasonably request; provided, however, that no such
qualification shall be required in any jurisdiction where, as a result thereof, the Partnership would become subject to general service of process or to taxation or qualification to do business in such jurisdiction solely as a result of registration
and (2) such forms, amendments, supplements, prospectuses, certificates, letters, opinions and other documents as may be necessary to apply for listing or to list the Registrable Securities subject to such Demand

  
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Registration on the Trading Market and (B) do any and all other acts and things that may be necessary or appropriate or reasonably requested by the Holders to enable the Holders to
consummate a public sale of such Registrable Securities in accordance with the intended timing and method or methods of distribution thereof. 
 (x) In the event a Holder transfers Registrable Securities included on a Registration Statement and such Registrable Securities remain Registrable Securities following such transfer, at the request of
such Holder, the Partnership shall amend or supplement such Registration Statement or related Prospectus as may be necessary in order to enable such transferee to offer and sell such Registrable Securities pursuant to such Registration Statement.

 (c) Piggyback Registration. 
 (i) If the Partnership shall at any time propose to file a Registration Statement, other than pursuant to a Demand Registration, for an offering of Common Units for cash (whether in connection with a
public offering of Common Units by the Partnership, a public offering of Common Units by unitholders, or both, but excluding an offering relating solely to an employee benefit plan, an offering relating to a transaction on Form S-4 or an offering on
any registration statement form that does not permit secondary sales), the Partnership shall promptly notify all Holders of such proposal reasonably in advance of (and in any event at least ten Business Days before) the anticipated initial filing
date of such Registration Statement (the “Piggyback Notice”). The Piggyback Notice shall offer the Holders the opportunity to include for registration in such Registration Statement the number of Common Units constituting
Registrable Securities as they may request (a “Piggyback Registration”). The Partnership shall use reasonable best efforts to include in each such Piggyback Registration such Registrable Securities for which the Partnership has
received written requests within five Business Days after mailing of the Piggyback Notice (“Piggyback Request”) for inclusion therein. If a Holder decides not to include all of its Common Units constituting Registrable Securities in
any Registration Statement thereafter filed by the Partnership, such Holder shall nevertheless continue to have the right to include any Registrable Securities in any subsequent registration statement or registration statements as may be filed by
the Partnership with respect to offerings of Common Units, all upon the terms and conditions set forth herein. 
 (ii) If the
Registration Statement under which the Partnership gives notice under this Section 2(c) is for an underwritten offering, the Partnership shall so advise the Holders of Registrable Securities. In such event, the right of any Holder to be
included in a registration pursuant to this Section 2(c) shall be conditioned upon such Holder’s participation in such underwriting and the inclusion of such Holder’s Registrable Securities in the underwriting to the extent provided
herein. If the managing underwriter or managing underwriters of such offering advise the Partnership that, in their opinion, the inclusion of all of such Holders’ Registrable Securities in the subject Registration Statement would have a
material adverse effect on the marketability of the offering, then the Partnership shall so advise all Holders of Registrable Securities that would otherwise be underwritten pursuant hereto, and the number of Registrable Securities that may be
included in the underwriting shall be reduced to equal the number of Registrable Securities that such managing underwriter or managing underwriters advise the Partnership can be sold without having such material adverse effect. The aggregate number
of Registrable Securities to be included in such underwriting as a result of the reduction described 

  
 10 

 
in the immediately preceding sentence shall be allocated (i) first to Bronco based on the number of Registrable Securities proposed to be sold by Bronco, and, subject to the
Partnership’s need for capital and without reducing the number of Common Units to be issued by the Partnership in such underwritten offering, Bronco shall have the right to include a number of Registrable Securities equal to 25% of the total
number of Common Units proposed to be sold, and (ii) second, among the other Holders seeking to include their Registrable Securities in the underwriting on a pro rata basis based on the percentage derived by dividing (x) the number of
Registrable Securities owned by such Holder by (y) the total number of Registrable Securities owned by such other Holders (excluding Bronco) seeking to include their Registrable Securities in the underwriting. If any Holder disapproves of the
terms of any such underwriting, such Holder may elect to withdraw therefrom by written notice to the Partnership and the managing underwriter(s) delivered on or prior to the time of pricing of such offering. For the avoidance of doubt, the
securities to be sold for the account of the Partnership pursuant to this section 2(c) shall be included in such underwriting before any Registrable Securities to be sold by any Holders or any other Person. Any Registrable Securities excluded or
withdrawn from such underwriting shall be withdrawn from the registration. 
 (iii) The Partnership shall have the right to
terminate or withdraw any registration initiated by it under this Section 2(c) prior to the Effective Date of such Registration Statement whether or not any Holder has elected to include Registrable Securities in such Registration Statement.
The registration expenses of such withdrawn registration (including reasonable attorneys fees of the Holders that elected to include Registrable Securities in such Registration Statement) shall be borne by the Partnership in accordance with
Section 5 hereof. 
 (d) General Provisions. 
 (i) All registration rights granted under this Section 2 shall continue to be applicable with respect to any Holder for so long as may be required for each such Holder to sell all of the Registrable
Securities held by such Holder as provided in this Agreement. 
 (ii) Any Demand Notice or Piggyback Request shall
(i) specify the Registrable Securities intended to be offered and sold by the Holder making the request, (ii) express such Holder’s present intent to offer such Registrable Securities for distribution, (iii) describe the nature
or method of the proposed offer and sale of Registrable Securities, and (iv) contain the undertaking of such Holder to provide all such information and materials and take all action as may reasonably be required in order to permit the
Partnership to comply with all applicable requirements in connection with the registration of such Registrable Securities. 

(iii) The Partnership has not entered into any agreement which (a) conflicts with the provisions hereof in any material respect or
(b) would allow any Holder to include Registrable Securities in any Registration Statement filed by the Partnership on a basis that is superior or more favorable in any material respect to the rights granted to the Holders hereunder.

 (iv) Notwithstanding any provision of this Agreement to the contrary, the Partnership may voluntarily suspend the
effectiveness of any Shelf Registration Statement or may otherwise require the discontinuance of offers under the Shelf Registration Statement for a period of up to 90 days if the Conflicts Committee, proceeding in good faith, determines the

  
 11 

 
offering of any Registrable Securities pursuant to such Shelf Registration Statement would require an Adverse Disclosure (a “Suspension”); provided, however, that in no
event shall the Partnership effect Suspensions under this Section 2(d)(iv) for more than an aggregate of 180 days in any 12-month period. The Partnership shall notify each Holder eligible to sell
Registrable Securities under such Shelf Registration Statement promptly of any Suspensions and, upon receipt of such notice, each such Holder shall forthwith discontinue disposition of such Registrable Securities under such Shelf Registration
Statement until such Holder’s receipt of the copies of the supplemental Prospectus or amended Shelf Registration Statement or until it is advised in writing by the Partnership that the use of the applicable Prospectus may be resumed, and, in
either case, has received copies of any additional or supplemental filings that are incorporated or deemed to be incorporated by reference in such Shelf Registration Statement. In addition, the Partnership shall promptly notify each Holder of the
termination or lifting of any such Suspension. 
 3. Registration Procedures. The procedures to be followed by the
Partnership and each Holder electing to sell Registrable Securities included in a Registration Statement pursuant to this Agreement, and the respective rights and obligations of the Partnership and such Holders, with respect to the preparation,
filing and effectiveness of such Registration Statement, are as follows: 
 (a) The Partnership will, at least five Business Days
prior to the anticipated filing of a Registration Statement or any related Prospectus or any amendment or supplement thereto (other than amendments and supplements filed principally for the purpose of naming Holders and providing information with
respect thereto), (i) furnish to such Holders copies of all such documents proposed to be filed and (ii) give good faith consideration to such comments as any Holder reasonably shall propose. 

(b) The Partnership will use reasonable best efforts to (i) prepare and file with the Commission such amendments, including
post-effective amendments, and supplements to each Registration Statement and the Prospectus used in connection therewith as may be necessary under applicable law to keep such Registration Statement continuously effective with respect to the
disposition of all Registrable Securities covered thereby for its Effectiveness Period and, subject to the limitations contained in this Agreement, prepare and file with the Commission such additional Registration Statements in order to register for
resale under the Securities Act all of the Registrable Securities held by the applicable Holders; (ii) cause the related Prospectus to be amended or supplemented by any required prospectus supplement, and as so supplemented or amended to be
filed pursuant to Rule 424; and (iii) respond to any comments received from the Commission with respect to each Registration Statement or any amendment thereto and provide such Holders true and complete copies of all correspondence from
and to the Commission relating to such Registration Statement that pertains to such Holders as Selling Holders. 
 (c) The
Partnership will comply in all material respects with the provisions of the Securities Act and the Exchange Act with respect to the Registration Statements and the disposition of all Registrable Securities covered by each Registration Statement.

  
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 (d) The Partnership will use reasonable best efforts to notify such Holders promptly: (i)(A)
when the Commission notifies the Partnership whether there will be a “review” of such Registration Statement and whenever the Commission comments in writing on such Registration Statement (in which case the Partnership shall provide true
and complete copies thereof and all written responses thereto to each of such Holders and in good faith consider such Holder’s comments in the Registration Statement); and (B) with respect to each Registration Statement or any
post-effective amendment thereto, when the same has been declared effective; (ii) of any request by the Commission or any other federal or state governmental authority for amendments or supplements to a Registration Statement or Prospectus or
for additional information that pertains to such Holders as sellers of Registrable Securities; (iii) of the issuance by the Commission of any stop order suspending the effectiveness of a Registration Statement covering any or all of the
Registrable Securities or the initiation of any Proceedings for that purpose; (iv) of the receipt by the Partnership of any notification with respect to the suspension of the qualification or exemption from qualification of any of the
Registrable Securities for sale in any jurisdiction, or the initiation or threatening of any Proceeding for such purpose; and (v) of the occurrence of (but not the nature or details concerning) any event or passage of time that makes any
statement made in such Registration Statement or Prospectus or any document incorporated or deemed to be incorporated therein by reference untrue in any material respect or that requires any revisions to such Registration Statement, Prospectus or
other documents so that, in the case of such Registration Statement or the Prospectus, as the case may be, it will not contain any untrue statement of a material fact or omit to state any material fact required to be stated therein or necessary to
make the statements therein, in the light of the circumstances under which they were made, not misleading (provided, however, that no notice by the Partnership shall be required pursuant to this clause (v) in the event that the
Partnership either promptly files a prospectus supplement to update the Prospectus or a Form 8-K or other appropriate Exchange Act report that is incorporated by reference into the Registration Statement, which in either case, contains the requisite
information that results in such Registration Statement no longer containing any untrue statement of material fact or omitting to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were
made, not misleading). 
 (e) The Partnership will use reasonable best efforts to avoid the issuance of, or, if issued, obtain
the withdrawal of (i) any order suspending the effectiveness of a Registration Statement, or (ii) any suspension of the qualification (or exemption from qualification) of any of the Registrable Securities for sale in any jurisdiction, at
the earliest practicable time, or if any such order or suspension is made effective during any Suspension period, at the earliest practicable time after the Suspension period is over. 

(f) During the Effectiveness Period, the Partnership will furnish to each such Holder, without charge, at least one conformed copy of each
Registration Statement and each amendment thereto and all exhibits to the extent requested by such Holder (including those incorporated by reference) promptly after the filing of such documents with the Commission; provided, that the
Partnership will not have any obligation to provide any document pursuant to this clause that is available on the Commission’s EDGAR system. 

  
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 (g) The Partnership will promptly deliver to each Holder, without charge, as many copies of
each Prospectus or Prospectuses (including each form of Prospectus) and each amendment or supplement thereto as such Holder may reasonably request during the Effectiveness Period. The Partnership consents to the use of such Prospectus and each
amendment or supplement thereto by each of the Selling Holders in connection with the offering and sale of the Registrable Securities covered by such Prospectus and any amendment or supplement thereto. 

(h) The Partnership will have caused or will cause, as the case may be, all Registrable Securities registered pursuant to this Agreement
to be listed on the Trading Market and will have provided or will provide, as the case may be, a transfer agent and registrar for Registrable Securities covered by a Registration Statement not later than the Effective Date of such Registration
Statement and for as long as Registrable Securities covered by a Registration Statement remain outstanding. 
 (i) The
Partnership will cooperate with such Holders to facilitate the timely preparation and delivery of certificates representing Registrable Securities to be delivered to a transferee pursuant to a Registration Statement, which certificates shall be free
of all restrictive legends indicating that the Registrable Securities are unregistered or unqualified for resale under the Securities Act, Exchange Act or other applicable securities laws, and to enable such Registrable Securities to be in such
denominations and registered in such names as any such Holder may request in writing. 
 (j) Upon the occurrence of any event
contemplated by Section 3(d)(v), as promptly as reasonably possible, the Partnership will prepare a supplement or amendment, including a post-effective amendment, if required by applicable law, to the affected Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to be incorporated therein by reference, and file any other required document so that, as thereafter delivered, no Registration Statement nor any Prospectus will contain an
untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading. 

(k) Such Holders may distribute the Registrable Securities by means of an underwritten offering; provided that (i) such
Holders provide written notice to the Partnership of their intention to distribute Registrable Securities by means of an underwritten offering, (ii) the right of any Holder to include such Holder’s Registrable Securities in such
registration shall be conditioned upon such Holder’s participation in such underwriting and the inclusion of such Holder’s Registrable Securities in the underwriting to the extent provided herein, (iii) the managing underwriter or
managing underwriters thereof shall either be one of the lead underwriters of the Initial Public Offering or otherwise be subject to the approval of the Partnership (which shall not be unreasonably withheld), (iv) each Holder participating in
such underwritten offering agrees to enter into an underwriting agreement in customary form and sell such Holder’s Registrable Securities on the basis provided in any reasonable underwriting arrangements approved by the Partnership and
(v) each Holder participating in such underwritten offering completes and executes all questionnaires, powers of attorney, indemnities, underwriting agreements and other documents reasonably and customarily required under the terms of such
underwriting arrangements, provided, that, no Holder included in any underwritten registration shall be required to make any representations or warranties to the Partnership or the 

  
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underwriters (other than representations and warranties regarding such Holder) or to undertake any indemnification obligations to the Partnership or the underwriters except as provided in
Section 6. The Partnership hereby agrees with each Holder that, in connection with any underwritten offering in accordance with the terms hereof, it will negotiate in good faith and execute all indemnities, underwriting agreements and other
documents reasonably required under the terms of such underwriting arrangements, including using reasonable best efforts to procure customary legal opinions and auditor “comfort” letters. 

(l) In the event such Holders seek to complete an underwritten offering, for a reasonable period prior to the filing of any Registration
Statement and throughout the Effectiveness Period, the Partnership will make available upon reasonable notice at the Partnership’s principal place of business or such other reasonable place for inspection by the Selling Holder and the managing
underwriter or managing underwriters selected in accordance with Section 3(k) such financial and other information and books and records of the Partnership, and cause the officers, employees, counsel and independent certified public accountants
of the Partnership to respond to such inquiries, as shall be reasonably necessary (and in the case of counsel, not violate an attorney-client privilege in such counsel’s reasonable belief) to conduct a reasonable investigation within the
meaning of Section 11 of the Securities Act. 
 (m) In connection with any registration of Registrable Securities pursuant
to this Agreement, the Partnership will take such reasonable best actions as are necessary or advisable in order to expedite or facilitate the disposition of Registrable Securities by such Holders, including using reasonable best efforts to cause
appropriate officers and employees to be available, on a customary basis and upon reasonable notice, to meet with prospective investors in presentations, meetings and road shows. 

(n) The Partnership will have no obligation to include in a Registration Statement or Piggyback Registration Registrable Securities of a
Holder who has failed to timely furnish such information requested in writing by the Partnership no less than 10 days prior to the effective date of the Registration Statement, which, in the opinion of counsel to the Partnership, is reasonably
required in order for the Registration Statement or related Prospectus to comply with the Securities Act, provided that if the Registration Statement is not yet effective, the Partnership agrees to amend the Registration Statement to include the
Registrable Securities of a Holder when such information is provided. 
 (o) In connection with any Initial Public Offering of
Common Units, each Holder hereby agrees that such Holder shall enter into a standard lock-up agreement covering such Registrable Securities and for a period specified by the managing underwriter or managing underwriters (the “Lock-Up
Period”); provided, however, that the Lock-Up Period with respect to Bronco shall not exceed 180 days following the closing date of the offering of Common Units. In addition, if (A) during the last 17 days of the Lock-Up Period,
the Partnership issues an earnings release or material news or a material event relating to the Partnership occurs or (B) prior to the expiration of the Lock-Up Period, the Partnership announces that it will release earnings results during the
16-day period beginning on the last day of the Lock-Up Period, then the restrictions imposed by this Section 3(o) shall continue to apply until the expiration of the 18-day period beginning on the issuance of the earnings release or the
announcement of the material news or the occurrence of the material event. Each Holder agrees to execute and deliver such 

  
 15 

 
other agreements as may be reasonably requested by the Partnership or the underwriter which are consistent with the foregoing or which are necessary to give further effect thereto. In addition,
if requested by the Partnership or the representative of the underwriters of Common Units, each Holder shall provide, within five Business Days of such request, such information as may be reasonably and customarily required by the Partnership or
such representative in connection with the completion of any public offering of the Common Units pursuant to a Registration Statement, unless such Holder reasonably believes that such information constitutes material and non-public information or
such Holder is otherwise subject to confidentiality obligations with respect to the requested information. The obligations described in this Section 3(o) shall not apply to a registration relating solely to employee benefit plans on Form S-1 or
Form S-8 or similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that may be promulgated in the future. The Partnership may impose stop-transfer instructions with
respect to the Common Units subject to the foregoing restriction until the end of the Lock-Up Period. 
 (p) The Partnership will
use its reasonable best efforts to comply with the securities laws of the United States and other applicable jurisdictions and all applicable rules and regulations of the Commission and comparable governmental agencies in other applicable
jurisdictions and make generally available to the Holders, in each case as soon as practicable after the Effective Date (it being understood that the Partnership shall have until at least 410 days or, if the fourth quarter following the fiscal
quarter that includes the Effective Date is the last fiscal quarter of the Partnership’s fiscal year, 455 days after the end of the Partnership’s then-current fiscal quarter), an earnings statement of the Partnership (which need not be
audited) complying with the provisions of Section 11(a) of the Securities Act (including, at the option of the Partnership, Rule 158). 
 4. Bronco IPO Consultation. The Board of Directors will determine all matters related to the Initial Public Offering and the related registration process. The Parties acknowledge and agree
that the Sponsor Parties and Bronco each desire for the Initial Public Offering to be implemented upon terms and conditions that are consistent with prevailing market terms for the public offering of equity securities of comparable master limited
partnerships at the time such Initial Public Offering is implemented. In furtherance of this desire, the Sponsor Parties, the General Partner and the Partnership agree that such IPO Registration shall be implemented in good faith at such prevailing
market terms, including with respect to the applicable distribution coverage ratio, as determined in consultation with the managing underwriter at the time of the Initial Public Offering. For so long as Bronco holds at least the Initial Bronco
Amount, Bronco shall be involved in planning and negotiating the terms of the Initial Public Offering or such other registration process, including, without limitation, in determining the percentage of the Partnership to be offered to the public and
the valuation metrics associated with the Initial Public Offering or such registration process. To that end, Bronco will be included in any applicable working group list with respect to an Initial Public Offering and will be given notice of, and an
opportunity to participate in, all discussions between the Partnership and/or any Sponsor Party or Affiliate of a Sponsor Party and any banker, underwriter or other third party regarding management preparation, pricing and other material matters
related to the Initial Public Offering and the related registration process. Notwithstanding anything in this Agreement to the contrary, the rights provided to Bronco in the two immediately preceding sentences shall not be transferable in connection
with any transfer of Registrable Securities by Bronco. 

  
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 5. Registration Expenses. All Registration Expenses incident to the
Parties’ performance of or compliance with their respective obligations under this Agreement or otherwise in connection with any IPO Registration, Demand Registration or Piggyback Registration (excluding any Selling Expenses) shall be borne by
the Partnership, whether or not any Registrable Securities are sold pursuant to a Registration Statement. “Registration Expenses” shall include, without limitation, (i) all registration and filing fees (including fees and
expenses (A) with respect to filings required to be made with the Trading Market, (B) in connection with any filings required to be made with the Financial Industry Regulatory Authority, Inc. and (C) in compliance with applicable
state securities or “Blue Sky” laws), (ii) printing expenses (including expenses of printing certificates for Common Units and of printing prospectuses if the printing of prospectuses is reasonably requested by a Holder included in
the Registration Statement), (iii) messenger, telephone and delivery expenses, (iv) fees and expenses of counsel (including local and special), auditors and accountants (including the expenses of any “cold comfort” letters
required or incidental to the performance of such obligations) for the Partnership, (v) Securities Act liability insurance, if the Partnership so desires such insurance, (vi) fees and expenses of all other Persons retained by the
Partnership in connection with the consummation of the transactions contemplated by this Agreement, (vii) the costs and expenses related to investor presentations on any road show undertaken in connection with the marketing of the Common Units,
including, expenses associated with any electronic road show, travel and lodging expenses of the officers and employees of the General Partner or any Group Member, (viii) the costs and expenses of qualifying the Common Units for inclusion in
the book-entry settlement system of the DTC and (ix) the fees and expenses of the transfer agent and registrar. Except as provided herein, all Selling Expenses shall be borne by the Selling Holders pro rata in proportion to the number of
Registrable Securities sold by each Selling Holder or as they may otherwise agree; provided, however, that any and all reasonable fees and expenses of counsel incurred by Bronco in connection with the IPO Registration shall be borne by
the Partnership, provided that such reimbursed fees and expenses shall not, in the aggregate, exceed $250,000 if the IPO Date occurs on or before December 31, 2013, which amount shall increase by $25,000 per quarter (and partial quarter) after
December 31, 2013 until the IPO Date occurs. 
 6. Indemnification. 

(a) By the Partnership. If underwriters are engaged in connection with any registration referred to in Section 2, the
Partnership shall provide indemnification, representations, covenants, opinions and other assurances to the underwriters in form and substance reasonably satisfactory to such underwriters and the Partnership. In the event of a registration of any
Registrable Securities under the Securities Act pursuant to this Agreement, in addition to and not in limitation of the Partnership’s obligations under Section 7.7 of the Partnership Agreement, to the fullest extent permitted by applicable
law, the Partnership shall indemnify and hold harmless each Selling Holder, its officers, directors and each Person who controls the Holder (within the meaning of the Securities Act), and any agent thereof (collectively, “Indemnified
Persons”) from and against any and all losses, claims, damages, liabilities, joint or several, expenses (including legal fees and expenses), judgments, fines, 

  
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penalties, interest, settlements or other amounts arising from any and all claims, demands, actions, suits or proceedings, whether civil, criminal, administrative or investigative, in which any
Indemnified Person may be involved, or is threatened to be involved, as a party or otherwise, under the Securities Act or otherwise (collectively, “Losses”), based upon, arising out of or resulting from any untrue statement or
alleged untrue statement of any material fact contained in the Registration Statement, preliminary prospectus, final prospectus or issuer free writing prospectus under which any Registrable Securities were registered or sold by such Selling Holder
under the Securities Act, or arising out of, based upon or resulting from the omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading; provided,
however, that the Partnership shall not be liable to any Indemnified Person to the extent that any such Loss arises out of, is based upon or results from an untrue statement or alleged untrue statement or omission or alleged omission so made in
such Registration Statement, preliminary prospectus, final prospectus or issuer free writing prospectus in reliance upon or in conformity with written information furnished to the Partnership by or on behalf of such Selling Holder specifically for
use in the preparation thereof. 
 (b) By Each Selling Holder. Each Selling Holder agrees, to the fullest extent permitted
by law, to severally and not jointly, indemnify and hold harmless the Partnership, the General Partner’s officers and its directors and each Person who controls the Partnership (within the meaning of the Securities Act) and any agent thereof to
the same extent as the foregoing indemnity from the Partnership to the Selling Holders, but only with respect to information regarding such Selling Holder furnished in writing by or on behalf of such Selling Holder expressly for inclusion in such
Registration Statement, preliminary prospectus, final prospectus or free writing prospectus and any indemnification hereunder will be limited to the amount of net proceeds received from the sale of Registrable Securities by such Holder under such
Registration Statement. 
 7. Facilitation of Sales Pursuant to Rule 144. 

(a) Upon effectiveness of a Registration Statement with the Commission, the Partnership shall use reasonable best efforts to timely file
the reports required to be filed by it under the Exchange Act or the Securities Act (including the reports under Sections 13 and 15(d) of the Exchange Act referred to in subparagraph (c)(1) of Rule 144), and take such further action as any Holder
may reasonably request, all to the extent required from time to time to enable the Holders to sell Registrable Securities without registration under the Securities Act within the limitations of the exemption provided by Rule 144. 

(b) The Parties agree that, as of the date of this Agreement, it is the intent of the Parties that the ownership, operation and management
of the Partnership will be structured so that Bronco will not be considered an “affiliate” (as such term is defined in Rule 144) of the Partnership. In connection therewith on or before the 91st day following the IPO Closing Date, subject
to compliance with applicable law and so long as Bronco together with its Affiliates (i) owns less than 15% of the Common Units, and (ii) has no right to designate any member of the Board of Directors, the Partnership will remove any
transfer restrictions with respect to Common Units owned by Bronco, including providing such authorizations, directions and legal opinions as may be reasonably requested by the transfer agent that authorize the removal of any restrictive legends on
such Common Units and/or directing the transfer agent to issue such Common Units without any such legend upon sale by Bronco of such Common Units. 

  
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 8. Limitation on Subsequent Registration Rights. From and after the date
hereof, the Partnership shall not, without the prior written consent of Bronco (for so long as it is a Holder) and the Holders of a majority of the then outstanding Registrable Securities, enter into any agreement with any current or future holder
of any securities of the Partnership that would allow such current or future holder to require the Partnership to include securities in any registration statement filed by the Partnership on a basis that is senior in any way to the registration
rights granted to the Initial Holders hereunder. 
 9. Miscellaneous. 

(a) Discontinued Disposition. Each Holder agrees by its acquisition of such Registrable Securities that, upon receipt of a notice
from the Partnership of the occurrence of any event of the kind described in clauses (ii) through (v) of Section 3(d), such Holder shall forthwith discontinue disposition of such Registrable Securities under the Registration Statement
until such Holder’s receipt of the copies of the supplemental Prospectus or amended Registration Statement or until it is advised in writing by the Partnership that the use of the applicable Prospectus may be resumed, and, in either case, has
received copies of any additional or supplemental filings that are incorporated or deemed to be incorporated by reference in such Prospectus or Registration Statement. The Partnership may provide appropriate stop orders to enforce the provisions of
this Section 9(a). 
 (b) Recapitalization, Exchanges, etc. Affecting the Common Units. The provisions of this
Agreement shall apply to the full extent set forth herein with respect to any and all Partnership Interests or any successor or assign of the Partnership (whether by merger, consolidation, sale of assets or otherwise) which may be issued in respect
of, in exchange for or in substitution of, the Registrable Securities, including any equity securities that may be issued in exchange for Registrable Securities in connection with any merger, consolidation or other business combination involving the
Partnership and any of its subsidiaries, and shall be appropriately adjusted for combinations, recapitalizations and the like occurring after the date of this Agreement. The Partnership will not take any action, or permit any change to occur, with
respect to the terms of its securities that would materially and adversely affect the ability of the Holders to include Registrable Securities in a registration undertaken pursuant to this Agreement or that would adversely affect the marketability
of such Registrable Securities in any such registration. 
 (c) Change of Control. The Partnership shall not merge,
consolidate or combine with any other Person unless the agreement providing for such merger, consolidation or combination expressly provides for the continuation of the registration rights specified in this Agreement with respect to the Registrable
Securities or other equity securities issued pursuant to such merger, consolidation or combination. 
 (d) Specific
Performance. Damages in the event of breach of this Agreement by a Party may be difficult, if not impossible, to ascertain, and it is therefore agreed that each such Party, in addition to and without limiting any other remedy or right it may
have, will have 

  
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the right to an injunction or other equitable relief in any court of competent jurisdiction, enjoining any such breach, and enforcing specifically the terms and provisions hereof, and each of the
Parties hereby waives any and all defenses it may have on the ground of lack of jurisdiction or competence of the court to grant such an injunction or other equitable relief (including the requirement to post bond). The existence of this right will
not preclude any such Party from pursuing any other rights and remedies at law or in equity which such Party may have. 
 (e)
Amendments. This Agreement may be amended only by means of a written amendment signed by (i) the Partnership, (ii) the Holders of 66 2/3% of the then-outstanding Registrable Securities and (iii) for so long as it is a Holder,
Bronco; provided, however, that no such amendment shall adversely affect the rights of any Holder hereunder without the consent of such Holder. 
 (f) Notices. All notices, demands, requests and other communications required or permitted to be given or made under this Agreement shall be in writing and shall be deemed given or made when
delivered in person or when sent by first class United States mail or by other means of written communication to the Person at the address described below: 
 (i) if to a Holder, at (A) the most current mailing or email address given by such Holder to the Partnership in accordance with the provisions of this Section 9(f), which addresses initially
are, with respect to the Holders, set forth opposite each Holder’s name on the signature page hereto; 
 (ii) if to a
transferee of a Holder, to such Holder at the mailing address or email address provided pursuant to this Section 9(f); and 

(iii) if to the Partnership, to each of the following: (A) 1111 Louisiana Street, Houston, Texas 77002 or Email:
Gary.Whitlock@CenterPointEnergy.com, Attention: Chief Financial Officer and (B) 321 North Harvey, P.O. Box 321, Oklahoma City, Oklahoma 73101-0321 or Email: trauscrs@oge.com, Attention: Sean Trauschke, notice of which is given in accordance
with the provisions of this Section 9(f). 
 The terms “in writing,” “written communications,” “written
notice” and words of similar import shall be deemed satisfied under this Agreement by use of email and other forms of electronic communication. All such notices and communications shall be deemed to have been received (i) at the time
delivered by hand, if personally delivered; (ii) the date of transmission, if such notice or communication is delivered via facsimile or email prior to 5:00 p.m. Central Time on a Business Day; (iii) the first Business Day after the date
of transmission, if such notice or communication is delivered via facsimile or email (A) on a day other than a Business Day or (B) later than 5:00 p.m. Central Time on a Business Day and earlier than 11:59 p.m. Central Time on such date;
or (iv) when actually received, if sent by any other means. 
 (g) Successors and Assigns. This Agreement shall be
binding upon and inure to the benefit of the Parties hereto and their heirs, executors, administrators, successors, legal representatives and permitted assigns. Except as provided in this Section 9(g), this Agreement, and any rights or
obligations hereunder, may not be assigned without the prior written consent of 

  
 20 

 
the Partnership and the Holders. Notwithstanding anything in the foregoing to the contrary (but subject to the last sentence of Section 4), the registration rights of a Holder
pursuant to this Agreement with respect to all or any portion of its Registrable Securities may be assigned without such consent (but only with all related obligations) with respect to such Registrable Securities (and any Registrable Securities
issued as a dividend or other distribution with respect to, in exchange for or in replacement of such Registrable Securities) by such Holder to a transferee of such Registrable Securities; provided (i) the transfer of the underlying
Registrable Securities was made in accordance with the terms of the Partnership Agreement; (ii) the Partnership is, promptly after such transfer, furnished with written notice of the name, mailing address and email address of such transferee or
assignee and the Registrable Securities with respect to which such registration rights are being assigned; and (iii) such transferee or assignee agrees in writing to be bound by and subject to the terms set forth in this Agreement. The
Partnership may not assign its respective rights or obligations hereunder without the prior written consent of each of the Holders. 
 (h) Counterparts. This Agreement may be executed in counterparts, all of which together shall constitute an agreement binding on all the Parties, notwithstanding that all such Parties are not
signatories to the original or the same counterpart. Each Party shall become bound by this Agreement immediately upon affixing its signature hereto. 
 (i) Applicable Law; Forum, Venue and Jurisdiction. This Agreement shall be construed in accordance with and governed by the laws of the State of Delaware without regard to the principles of
conflicts of law that would request an application of another state’s laws. Each of the Parties: 
 (i)
irrevocably agrees that any claims, suits, actions or proceedings (A) arising out of or relating in any way to this Agreement (including any claims, suits or actions to interpret, apply or enforce the provisions of this Agreement or the duties,
obligations or liabilities among the Parties, or the rights or powers of, or restrictions on, the Parties) or (B) asserting a claim arising pursuant to any provision of the Delaware Act shall be exclusively brought in the Court of Chancery of
the State of Delaware (or, if such court does not have subject matter jurisdiction, any other court located in the State of Delaware with subject matter jurisdiction), in each case regardless of whether such claims, suits, actions or proceedings
sound in contract, tort, fraud or otherwise, are based on common law, statutory, equitable, legal or other grounds, or are derivative or direct claims; 
 (ii) irrevocably submits to the exclusive jurisdiction of such courts in connection with any such claim, suit, action or proceeding; 

(iii) agrees not to, and waives any right to, assert in any such claim, suit, action or proceeding that (A) it is not
personally subject to the jurisdiction of such courts or of any other court to which proceedings in such courts may be appealed, (B) such claim, suit, action or proceeding is brought in an inconvenient forum, or (C) the venue of such
claim, suit, action or proceeding is improper; 

  
 21 

 (iv) expressly waives any requirement for the posting of a bond by a party
bringing such claim, suit, action or proceeding; and 
 (v) consents to process being served in any such claim,
suit, action or proceeding by mailing, certified mail, return receipt requested, a copy thereof to such party at the address in effect for notices hereunder, and agrees that such services shall constitute good and sufficient service of process and
notice thereof; provided, nothing in clause (v) hereof shall affect or limit any right to serve process in any other manner permitted by law. 
 (j) Cumulative Remedies. The remedies provided herein are cumulative and not exclusive of any remedies provided by law. 
 (k) Invalidity of Provisions. If any provision or part of a provision of this Agreement is or becomes for any reason, invalid, illegal or unenforceable in any respect, the validity, legality and
enforceability of the remaining provisions and/or parts thereof contained herein shall not be affected thereby and this Agreement shall, to the fullest extent permitted by law, be reformed and construed as if such invalid, illegal or unenforceable
provision, or part of a provision, had never been contained herein, and such provisions and/or part shall be reformed so that it would be valid, legal and enforceable to the maximum extent possible. 

(l) Facsimile Signatures. The use of facsimile or electronic signatures affixed in the name and on behalf of the Party executing is
expressly permitted by this Agreement. 
 (m) Entire Agreement. This Agreement, together with the other Transaction
Documents, constitute the entire agreement among the Parties with respect to the subject matter hereof and supersede all prior contracts or agreements with respect to the subject matter hereof and the matters addressed or governed hereby or in the
other Transaction Documents, whether oral or written. Without limiting the foregoing, each of the Parties acknowledges and agrees that (i) this Agreement is being executed and delivered in connection with each of the other Transaction Documents
and the transactions contemplated hereby and thereby, (ii) the performance of this Agreement and the other Transaction Documents and expected benefits herefrom and therefrom are a material inducement to the willingness of the Parties to enter
into and perform this Agreement and the other Transaction Documents and the transactions described herein and therein, (iii) the Parties would not have been willing to enter into this Agreement in the absence of the entrance into, performance
of, and the economic interdependence of, the Transaction Documents, (iv) the execution and delivery of this Agreement and the other Transaction Documents and the rights and obligations of the parties hereto and thereto are interrelated and part
of an integrated transaction being effected pursuant to the terms of this Agreement and the other Transaction Documents, (v) irrespective of the form such documents have taken, or otherwise, the transactions contemplated by this Agreement and
the other Transaction Documents are necessary elements of one and the same overall and integrated transaction, (vi) the transactions contemplated by this Agreement and by the other Transaction Documents are economically interdependent and
(vii) such Party will cause any of its successors or permitted assigns to expressly acknowledge and agree to this Section 9(m) prior to any assignment or transfer of this Agreement, by operation of law or otherwise. 

  
 22 

 [Signature Pages Follow] 

  
 23 

 IN WITNESS WHEREOF, the Parties have executed this Agreement as of the date first written
above. 
  

					
		 	CENTERPOINT ENERGY FIELD SERVICES LP
			
		 	By:	 	CNP OGE GP LLC,
		 		 	its General Partner
			
		 	By:	 	 /s/ David M. McClanahan

		 		 	Name: David M. McClanahan
		 		 	Title: Interim Chairman
		
	 1111 Louisiana Street
	 	CENTERPOINT ENERGY RESOURCES CORP.
	 Houston, TX 77002
	 		 	
	 Attention: Chief Financial Officer
	 	By:	 	 /s/ Gary L. Whitlock

	 Fax: 713.207.9680
	 		 	Name: Gary L. Whitlock
	 Gary.Whitlock@CenterPointEnergy.com
	 		 	Title: Executive Vice President and Chief
		 		 	 Financial Officer

		
	 321 North Harvey
	 	OGE ENOGEX HOLDINGS LLC
	 P.O. Box 321
	 		 	
	 Oklahoma City, Oklahoma 73101-0321
	 	By:	 	OGE Energy Corp., its Sole Member
	 Attention: Sean Trauschke
	 		 	
	 Fax: 405.553.3760
	 	By:	 	 /s/ Sean Trauschke

	 trauscrs@oge.com
	 		 	Name: Sean Trauschke
		 		 	Title: Vice President and Chief Financial Officer
		
	 c/o ArcLight Capital Partners, LLC
	 	ENOGEX HOLDINGS LLC
	 200 Clarendon Street, 55th Floor
	 		 	
	 Boston, Massachusetts 02117
	 	By:	 	 /s/ Robb E. Turner

	 Attention: Christine M. Miller
	 		 	Name: Robb E. Turner
	 Fax: 617.867.4698
	 		 	Title: Vice President
	 cmiller@arclightcapital.com
	 		 	

 [Signature Page to Registration Rights Agreement]

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