Document:

Exhibit 4.4

TGI

TRANSPORTADORA DE GAS

DEL INTERIOR S.A. E.S.P.

BOGOTA ENERGY GROUP

Tax ID No. 900.134.459-7

 

SUPPLEMENTARY AGREEMENT No. 01 TO CONTRACT
ESTF-029-2008

 

CONTRACT INFORMATION

 

	Purpose of the Supplementary Agreement	:	Contracting of new transportation capacity subject to expansion of the Ballena-Barrancabermeja gas pipeline.
	 	 	 
	Estimated Value of the Supplementary Agreement	:	USD 30,054,886 plus $53,553,541,610.
	 	 	 
	Term of the Supplementary Agreement	:	December 31, 2020.
	 	 	 
	TRANSPORTER’S INFORMATION	 	 
	 	 	 
	Company Name	:	TRANSPORTADORA DE GAS DEL INTERIOR S.A. E.S.P. – TGI S.A. E.S.P.
	 	 	 
	Tax Identification No.	:	900.134.459-7
	 	 	 
	Legal Representative	:	JORGE ARMANDO PINEDA SÁNCHEZ
	 	 	 
	Identification	:	91.241.552 from Bucaramanga
	 	 	 
	Address	:	Carrera 34 No. 41-51
	 	 	 
	City	:	Bucaramanga
	 	 	 
	Telephone	:	632-0002
	 	 	 
	Fax	:	632-5525
	 	 	 
	SHIPPER’S INFORMATION:	 	 
	 	 	 
	Company Name	:	ECOPETROL S.A.
	 	 	 
	Tax Identification No.	:	899.999.068-1
	 	 	 
	Authorized Representative	:	CAMILO MARULANDA LÓPEZ
	 	 	 
	Identification	:	10.008.868 from Pereira
	 	 	 
	Address:	:	Carrera 13 A No. 87-10
	 	 	 
	City:	:	Bogota, Capital District
	 	 	 
	Telephone:	:	(57) (1) 234-4437
	 	 	 
	 	 	[initials]

 

SUPPLEMENTARY AGREEMENT NO. 01 to ESTF-029-2008

CARRERA 34 No. 41 – 51

PBX 57 (7) 632 00 02 FAX 57 (7) 632 55
25

BUCARAMANGA – COLOMBIA S.A.

www.tgi.com.co

 

[ISO Certification in English], Accredited

 

    	Page 1 of 3

    	 

    

 

TGI

TRANSPORTADORA DE GAS

DEL INTERIOR S.A. E.S.P.

BOGOTA ENERGY GROUP

Tax ID No. 900.134.459-7

 

SUPPLEMENTARY AGREEMENT No. 01 TO NATURAL
GAS TRANSPORTATION CONTRACT

 ESTF-029-2008

 

The undersigned parties, namely: JORGE
ARMANDO PINEDA SÁNCHEZ, who is of legal age, identified as appears below his signature, acting as First Alternate to
the President on behalf and as legal representative of TRANSPORTADORA DE GAS DEL INTERIOR S.A. E.S.P. – TGI S.A. E.S.P.,
a Corporate Provider of Public Services created on February 16, 2007 by means of Notarial Instrument No. 067 executed at the office
of Notary eleven (11) of the Bucaramanga circuit, with business registration number 05-138524-04, hereinafter referred to as the
TRANSPORTER; and CAMILO MARULANDA LOPEZ, of legal age, identified as appears below his signature, in his capacity as
Vice President of Supply and Marketing, exercising the authority contained in the Delegation Manual, acting in name and on behalf
of ECOPETROL S.A., a federal decentralized agency created by Law 165 of 1948, with Tax Identification No. 899-999-068-1,
organized as a Joint Venture Entity in accordance with the provisions of Article 2 of Law 1118 of 2006, under the Ministry of Energy
and Mines, with its primary domicile in Bogota, Capital District, whose Bylaws are contained in their entirety in Notarial Instrument
No. 5314 of December 14, 2007 and the successive amendments thereof, all executed in the Second Notary's Office of the Notarial
District of Bogota, Capital District, duly registered in the Chamber of Commerce of Bogota, Capital District, hereinafter referred
to as the SHIPPER; have agreed to execute this supplementary agreement, in accordance with the following:

 

WHEREAS:

 

1. On October 1, 2008, Ecopetrol S.A. and
TGI S.A. E.S.P. executed Natural Gas Firm Transportation Contract No. ESTF-029-2008, hereinafter the Contract, in force from December
1, 2012 through December 31, 2020.

 

2. The subject matter of the Contract established
that the transportation capacity contracted by the SHIPPER on the Ballena-Barrancabermeja route would be available as of the Service
Commencement Date established in numeral 5.2 of Section I ESTF of the Contract, once the TRANSPORTER placed the facilities in operation
that will permit the increase in the capacity of the Ballena-Barrancabermeja gas pipeline, which it agreed to do by no later than
June first (1st), 2010.

 

3. This expansion will take the rated capacity
of the Ballena-Barrancabermeja gas pipeline to 260 MCFD, which was made viable with the execution of the firm transportation contracts
subject to this expansion on October 1, 2008.

 

4. Once the contracts mentioned in the
preceding clause were executed, transportation capacity was made available via the Ballena-Barrancabermeja gas pipeline, which
was offered by the TRANSPORTER to the SHIPPER and to the other shippers who signed contracts on the specified date, under the same
conditions as the contracts signed at that time.

 

5. The TRANSPORTER offered the SHIPPER
the additional quantities shown below for the period from December 2012 to December 2020.

 

	Period	 	Additional kcfd	 
	From December 1, 2012 to December 31, 2012	 	 	28,714	 
	From January 1, 2013 to December 31, 2020	 	 	16,500	 

 

6. The SHIPPER accepted the capacity offered
by the TRANSPORTER.

 

7. The TRANSPORTER’S Commercial Committee
No. 13 of 2008 recommended the execution of this Supplementary Agreement.

 

8. In the Bulletin of Fiscal Debtors prepared
and published by the General Government Accounting Office of the Republic, the SHIPPER verified that the TRANSPORTER is not listed
as one of the persons against whom a final tax liability decision has been issued and who has not paid the obligation contained
therein.

 

[initials]

 

SUPPLEMENTARY AGREEMENT NO. 01 to ESTF-029-2008

CARRERA 34 No. 41 – 51

PBX 57 (7) 632 00 02 FAX 57 (7) 632 55
25

BUCARAMANGA – COLOMBIA S.A.

www.tgi.com.co

 

[ISO Certification in English], Accredited

 

    	Page 2 of 3

    	 

    

 

TGI

TRANSPORTADORA DE GAS

DEL INTERIOR S.A. E.S.P.

BOGOTA ENERGY GROUP

Tax ID No. 900.134.459-7

 

9. The TRANSPORTER evidences, via a certification
issued by its internal auditor within the month prior to the date of signing of this supplementary agreement, that it has satisfied
its obligations vis-à-vis health systems, occupational hazards, pensions and contributions to the Family Subsidy Funds,
Colombian Institute of Family Welfare and National Apprenticeship Service, with respect to all its employees.

 

10. Prior to the signing of this supplementary
agreement, the SHIPPER’s Gas Department implemented Asset Laundering Prevention Control Mechanisms and developed the Instruments
for Proper Application thereof, in compliance with its General Policy for the Prevention and Control of Asset Laundering from May
2007.

 

11. Neither the SHIPPER nor the TRANSPORTER
is affected by the disqualifications or incompatibilities provided for in the Law for entering into this supplementary agreement.

 

12. Both the TRANSPORTER’s and the
SHIPPER’s representatives have the necessary authorization to sign this supplementary agreement.

 

In keeping with the foregoing, the Parties
have agreed to amend the Contract in the following manner:

 

CLAUSE ONE: Amend numeral
6.1 “Firm Capacity Contracted (kcf/d)” of Section I-ESTF of the Contract, so that henceforth it will read as follows:

 

6.1. Firm Capacity Contracted (kcf/d)

 

	From December 1, 2012 to December 31, 2020	Point 1: 101,500
	Point 2: 15,000
	Total: 116,500

 

Paragraph: As soon as it has more information
about the distribution of the quantities required at each exit point, the SHIPPER will report this in a timely manner by sending
a letter to the TRANSPORTER, which will be made official by means of a supplementary agreement to the contract.

 

CLAUSE TWO: Amend numeral 7.6 “Estimated
Value of the Contract” of Section I-ESTF of the Contract, so that it will henceforth read as follows:

 

	7.6 Estimated Value of the Contract	 	USD	 	 	$	 
	From December 1, 2012 to December 31, 2020	 	 	210,568,296	 	 	 	375,202,814,819	 

 

CLAUSE THREE: All other stipulations
of the Contract remain in force and unchanged.

 

This document is signed for the record
on the fifth (5th) day of the month of December of the year two thousand eight (2008).

 

	TRANSPORTADORA DE GAS DEL INTERIOR	 	ECOPETROL S.A.
	S.A. E.S.P.	 	 
	 	 	 
	[signature]	 	[signature]
	 	 	 
	JORGE ARMANDO PINEDA SÁNCHEZ	 	CAMILO MARULANDA LÓPEZ
	National Identity Card No. 91.241.552	 	National Identity Card No. 10.008.868
	from Bucaramanga	 	from Pereira
	[handwritten initials]	 	[handwritten initials]

 

	Prepared by:	María C. Gómez [initials]
	Reviewed by:	Sonia R. Sanabria M. [initials]
	 	Elaine Soto B.
	Approved by:	Jorge A. Pineda S.

 

SUPPLEMENTARY AGREEMENT NO. 01 to ESTF-029-2008

CARRERA 34 No. 41 – 51

PBX 57 (7) 632 00 02 FAX 57 (7) 632 55
25

BUCARAMANGA – COLOMBIA S.A.

www.tgi.com.co

 

[ISO Certification in English], Accredited

 

    	Page 3 of 3Exhibit 4.5

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

SUPPLEMENTARY AGREEMENT No. 02 TO CONTRACT
ESTF-029-2008

 

CONTRACT INFORMATION

 

	Purpose of the Supplementary Agreement	:	To add an Entry Point and an Exit Point and amend the contracted capacity.
	Estimated Value of the Supplementary 	 	 
	 	 	 
	Agreement	:	$4,673,691,634.
	 	 	 
	Term of the Contract	:	December 31, 2020.
	 	 	 
	TRANSPORTER’S INFORMATION	 	 
	 	 	 
	Company Name	:	TRANSPORTADORA DE GAS INTERNACIONAL S.A. E.S.P. – TGI S.A. E.S.P.
	 	 	 
	Tax Identification No.	:	900.134.459-7
	 	 	 
	Legal Representative	:	RICARDO ROA BARRAGÁN
	 	 	 
	Identification	:	19.451.246 from Bogotá
	 	 	 
	Address	:	Carrera 34 No. 41-51
	 	 	 
	City	:	Bucaramanga
	 	 	 
	Telephone	:	632-0002
	 	 	 
	Fax	:	632-5525

 

SHIPPER’S INFORMATION:

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 1 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

	Company Name	:	ECOPETROL S.A.
	 	 	 
	Tax Identification No.	:	899.999.068-1
	 	 	 
	Authorized Representative	:	CLAUDIA L. CASTELLANOS R.
	 	 	 
	Identification	:	63.314.635 from Bucaramanga
	 	 	 
	Address:	:	Calle 37 No. 8-43, 3rd floor, Bogotá
	 	 	 
	City:	:	Bogotá, Capital District
	 	 	 
	Telephone:	:	2344438

 

SUPPLEMENTARY AGREEMENT No. 02 TO NATURAL
GAS TRANSPORTATION CONTRACT ESTF-029-2008

 

The undersigned parties, namely: RICARDO
ROA BARRAGÁN, who is of legal age, identified as appears below his signature, acting as President in name and legal
representation of TRANSPORTADORA DE GAS INTERNACIONAL S.A. E.S.P. – TGI S.A. E.S.P., (formerly Transportadora de Gas
del Interior S.A. ESP), Sociedad Anónima y Empresa Prestadora de Servicios Públicos, created via Notarial Instrument
No. 67 dated February 16, 2007, executed at the Office of Notary 11 of the Notarial District of Bucaramanga-Santander, registered
in the Chamber of Commerce of the same city on February 19, 2007 under No. 69863, with trade registration number 05-000138524-04
and Tax Identification No. 900.134.459-7 and primary domicile in the city of Bucaramanga, hereinafter referred to as the TRANSPORTER;
and CLAUDIA L. CASTELLANOS, who is of legal age, identified as appears below her signature, in her capacity as Vice President
of Supply and Marketing, exercising the authorization contained in the Delegation Manual, acting in name and on behalf of ECOPETROL
S.A., a federal decentralized agency created by Statute 165 of 1948, with Tax Identification No. 899.999.068-1, organized as
a Joint Venture Entity in accordance with the provisions of Article 2 of Statute 1118 of 2006, under the Ministry of Energy and
Mines, with its primary domicile in Bogotá, Capital District, whose Bylaws are contained in their entirety in Notarial Instrument
No. 5314 of December 14, 2007 and the successive amendments thereto, all executed in the Office of Notary Two of the Notarial District
of Bogotá, Capital District, and registered in the Chamber of Commerce of Bogotá, Capital District, hereinafter referred to as
the SHIPPER; have agreed to execute this supplementary agreement, in accordance with the following:

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 2 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

  

WHEREAS:

 

1. On October 1, 2008, Ecopetrol S.A. and
TGI S.A. E.S.P. executed Natural Gas Firm Transportation Contract No. ESTF-029-2008, hereinafter the Contract, in force from December
1, 2012 through December 31, 2020.

 

2. On December 5, 2008, Ecopetrol and TGI
S.A. E.S.P. signed Supplementary Agreement No. 1 to the Contract, amending the firm capacity contracted and the estimated value
of the Contract, expanding the capacity initially contracted by the Parties.

 

3. In a letter dated January 13, 2012,
the SHIPPER requested to be informed of the maximum natural gas firm transportation capacity and the respective assignment it would
have in the Cusiana Porvenir – Exit Point 1 (CIB) route from the Contract, from December 1, 2012 through December 2014.

 

4. For the gas from Cusiana/Cupiagua to
be able to physically arrive at the Barrancabermeja Refinery and, therefore, for the capacity to be contracted from Cusiana Porvenir
to be Firm, some changes must be made to the TRANSPORTER’S Transportation System. For this purpose, the Parties signed Supplementary
Agreement No. 5 to Contract ESTF-004-2006, in which they included the terms under which these changes would be made once the Certificate
to which Clause Five of the Supplementary Agreement in question makes reference was signed.

 

5. The TRANSPORTER has stated that it is
expanding the Cusiana-El Porvenir-La Belleza-Vasconia transportation system (hereinafter "Phase II").

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 3 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

6. The SHIPPER requested that, while the
changes are being made to facilitate physically receiving gas from Cusiana/Cupiagua at the Barrancabermeja Refinery and until
these are operational, the firm capacity assigned on the Cusiana Porvenir – Exit Point 1 (CIB) route be contracted for the
Cusiana – Barranca E route, starting December 1, 2012.

 

7. The TRANSPORTER’S Commercial Committee
No. 04 of 2012 recommended the execution of this Supplementary Agreement.

 

8. In the Fiscal Debtor Bulletin prepared
and published by the General Government Accounting Office of the Republic, the SHIPPER verified that the TRANSPORTER is not listed
in this bulletin as one of the persons against whom a final tax liability decision has been issued and who has not paid the obligation
contained therein.

 

9. The TRANSPORTER evidences, via a certification
issued by its internal auditor within the month prior to the date of signing of this supplementary agreement, that it has satisfied
its obligations vis-à-vis health systems, occupational hazards, pensions and contributions to the Family Compensation Funds,
Colombian Institute of Family Welfare and National Apprenticeship Service, with respect to all its employees.

 

10. Prior to the signing of this supplementary
agreement, the SHIPPER’S Gas Department implemented Asset Laundering Prevention Control Mechanisms and developed the Instruments
for Proper Application thereof, in compliance with its General Policy for the Prevention and Control of Asset Laundering from May
2007.

 

11. Neither the SHIPPER nor the TRANSPORTER
is affected by the disqualifications or incompatibilities provided for in the Law for entering into this supplementary agreement.

 

12. Both the TRANSPORTER’S and the
SHIPPER’S representatives have the necessary authorization to sign this supplementary agreement.

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 4 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

In keeping with the foregoing, the Parties
have agreed to amend the Contract in the following manner:

 

CLAUSE ONE: Amend numerals 4.1 “Entry
Hub,” 4.2 “Exit Hub,” 4.3 “Entry Point” and 4.4. “Exit Point” of Section I-ESTF of the
Contract, starting on December 1, 2012, provided that Phase II of the capacity expansion from Cusiana has become operational, as
follows:

 

	4.1 Entry Hub	 	4.2 Exit Hub
	
         

        Ballena and Cusiana Porvenir
	 	
        1. CIB.

        2. Gas turbine

        3. Barranca E.

 

	4.3 Entry Point	 	4.4 Exit Point
	
         

        Ballena: Outlet flange of the meter located at the Ballena
        Station at Centragas.

         

        Cusiana Porvenir: Physical interconnection point between
        the facilities of the partners to the Santiago de las Atalayas contract in Cusiana and the Cusiana el Porvenir Gas Pipeline.
	 	
        1.  CIB: The outlet
        flange of the meters located on the 16” line at COGB.

        2.  Gas turbine: Hot
        tap installed on the 20” Gas line between Centragas and COGB located on Petrosantander property, which carries Gas to the
        gas turbine of the Barrancabermeja Refinery Facility (GRB) owned by the Shipper.

        3.  Barranca E: Outlet
        flange of the Centragas meters in Barrancabermeja.

 

CLAUSE TWO: Amend numeral 6.1 “Firm
Capacity Contracted (kcf/d)” of Section I-ESTF of the Contract, provided that Phase II of the capacity expansion from Cusiana
has become operational, as follows:

 

6.1. Firm Capacity Contracted (kcf/d)

 

	Route	 	December 2012	 	 	January to 
 December 2013	 	 	January to August 
 2014	 	 	September 2014 
 to December 2020	 
	Ballena – Exit Point 1 (CIB)	 	 	79,394	 	 	 	79,394	 	 	 	80,867	 	 	 	101,500	 
	Ballena – Exit Point 2 (GAS TURBINE)	 	 	15,000	 	 	 	15,000	 	 	 	15,000	 	 	 	15,000	 
	Cusiana Porvenir – Exit Point 1 (CIB)*	 	 	24,762	 	 	 	25,613	 	 	 	25,613	 	 	 	-	 

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 5 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

* Until such time as the modifications
that will make it possible to receive gas from Cusiana/Cupiagua at Exit Point 1 (CIB) of the Contract are operational, the firm
capacity contracted on the Cusiana Porvenir – Exit Point 1 (CIB) route will be assigned to the Cusiana Porvenir – Exit
Point 3 (Barranca E) route. This capacity will be firm, using the Structure of Charges contained in the table for the Cusiana Porvenir
– Exit Point 3 (Barranca E) route, established in number 7 of Section I-ESTF.

 

In addition, when it is technically and
operationally feasible, the TRANSPORTER will allow for the possibility of diverting the firm capacity contracted from Cusiana-Porvenir,
from Exit Point 3 (Barranca E) to Exit Point 1 (CIB).

 

CLAUSE THREE: Amend numerals 7.2 “Fixed
Charge (USD/KCFD/Year),” 7.3 Variable Charge (USD/KCF),” 7.4 Fixed Charge for Administration, Operation and Maintenance
($/KCFD/Year)” and 7.6 “Estimated Value of the Contract” from Section I-ESTF of the Contract, provided that Phase
II of the capacity expansion from Cusiana has become operational, as follows:

 

	Route	 	7.2 Fixed Charge 
 (USD/KCFD-Year)	 	 	7.3 Variable Charge 
 (USD/KCF)	 	 	7.4 Fixed Charge for 
 Administration, 
 Operation and 
 Maintenance ($/KCFD-

Year)	 
	Ballena – Exit Point 1 (CIB)	 	 	239,771	 	 	 	0	 	 	 	468,179	 
	Ballena – Exit Point 2 (GAS TURBINE)	 	 	239,771	 	 	 	0	 	 	 	468,179	 
	Cusiana Porvenir – Exit Point 1 (CIB)	 	 	300,255	 	 	 	0	 	 	 	324,745	 
	Cusiana Porvenir – Exit Point 3 (Barranca E)	 	 	300,255	 	 	 	0	 	 	 	324,745	 

*Charges from December 2011 applicable to
2012

 

7.6 Estimated Value of the Contract

 

	USD	 	$
	230,236,653	 	437,853,718,767

 

CLAUSE FOUR: Amend point 2.3 of
numeral 2 “Charges” of Chapter IV of the Contract, provided that Phase II of the capacity expansion from Cusiana has
become operational, as follows:

 

2.3 In the event that the TRANSPORTER authorizes
average daily transportation for one Gas Day greater than the Firm Capacity Contracted as established in 

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

[handwritten:] [initials]

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 6 of 7

    	 

    

 

TGI

BOGOTÁ ENERGY GROUP

Tax ID No. 900.134.459-7

 

Paragraph number 1 of this Chapter, the
transportation of this higher daily volume will incur an additional fee in dollars and an additional fee in pesos corresponding
to the maximum tariff of the “0% fixed, 100% variable” structure defined in Resolution CREG 125 of 2003, or in any
resolution that amends, adds to or replaces it, as shown in the following table:

 

	Route	 	USD/KCF	 	 	$/ KCF	 
	Ballena – Exit Point 1 (CIB)	 	 	0.850	 	 	 	1,283	 
	Ballena – Exit Point 2 (GAS TURBINE)	 	 	0.850	 	 	 	1,283	 
	Cusiana Porvenir – Exit Point 1 (CIB)	 	 	1.220	 	 	 	890	 
	Cusiana Porvenir – Exit Point 3 (Barranca E)*	 	 	1.220	 	 	 	890	 

*Charges from December 2011 applicable to
2012

 

CLAUSE FIVE: All other stipulations of
the Contract remain in force and unchanged.

 

Signed for the record on the eleventh (11th)
of April of the year two thousand twelve (2012).

 

	TRANSPORTADORA DE GAS INTERNACIONAL	 	ECOPETROL S.A.
	S.A. E.S.P.	 	 
	 	 	 
	[signature]	 	[signature]
	 	 	 
	RICARDO ROA BARRAGAN	 	CLAUDIA L. CASTELLANOS R.
	National Identity Card No. 19.451.246	 	National Identity Card No. 63.314.635
	from Bogotá	 	from Bucaramanga
	 [initials]	 	 [three sets of initials]

 

	Prepared by:	María C. Gómez	 
	Reviewed by:	Sonia R. Sanabria M. 	 [four sets of initials]
	 	Laura M. Parra R.	 
	 	Nubia Prada S.	 
	Approved by:	Ricardo Roa B.	 

 

SUPPLEMENTARY AGREEMENT NO. 02 to ESTF-029-2008

 

	 	CARRERA 34 NO. 41 – 51	 
	 	PBX 57 (7) 632 00 02 FAX 57 (7) 632 55 25	[ISO Certification in English]
	 	BUCARAMANGA, COLOMBIA, S.A.	 
	 	WWW.TGI.COM.CO	 

 

    	Page 7 of 7

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