JOINT FILING AGREEMENT

Exhibit 1

JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13D and any amendments to it with respect to the 12,642,668 American Depositary Receipts, representing 63,213,340 Class “B” Shares, par value Ps.1, of Transportadora de Gas del Sur S.A., and further agree that this Joint Filing Agreement be included as an Exhibit to those joint filings.

Dated: October 2, 2009

		AEI
		By:		/s/ Xxxxxxx X. Xxxx
		Name:		Xxxxxxx X. Xxxx
		Title:		EVP, General Counsel
		XXXXXXX GROUP PLC
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Head of Legal
		XXXXXXX INVESTMENT MANAGEMENT LIMITED
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Head of Legal
		XXXXXXX INVESTMENTS (UK) LIMITED
		By:		/s/ Xxxxx Xxxxxxx
		Name:		Xxxxx Xxxxxxx
		Title:		Head of Legal

		XXXXXXX MANAGEMENT COMPANY LIMITED
		By:		/s/ Xxxxx Xxxxx
		Name:		Xxxxx Xxxxx
		Title:		Director
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 2 LIMITED
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Global Special Situations Fund 2 Limited
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 3 LIMITED PARTNERSHIP
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Global Special Situations Fund 3 Limited Partnership
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 4 LIMITED PARTNERSHIP
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Global Special Situations Fund 4 Limited Partnership
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory

		XXXXXXX GLOBAL SPECIAL SITUATIONS FUND 5 LIMITED PARTNERSHIP
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Global Special Situations Fund 5 Limited Partnership
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX EMERGING MARKETS LIQUID INVESTMENT PORTFOLIO
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Emerging Markets Liquid Investment Portfolio
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX EMERGING MARKETS GLOBAL INVESTMENT PORTFOLIO LIMITED
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Emerging Markets Global Investment Portfolio Limited
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX GROWING MULTI STRATEGY FUND LIMITED
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Growing Multi Strategy Fund Limited
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory

		XXXXXXX GLOBAL OPPORTUNITIES LIMITED
		By: Northern Trust (Guernsey) Limited as custodian for and on behalf of Xxxxxxx Global Opportunities Limited
		By:		/s/ Xxxx Xxxxxxx	/s/ Xxxxx Xxxxxxx
		Name:		Xxxx Xxxxxxx	Xxxxx Xxxxxxx
		Title:		Authorised Signatory	Authorised Signatory
		XXXXXXX SICAV EMERGING MARKETS DEBT FUND
		By: Northern Trust Global Services Limited, London (Royaume-Uni) Luxembourg Branch as custodian for and on behalf of Xxxxxxx SICAV in respect of Xxxxxxx SICAV Emerging Markets Debt Fund
		By:		/s/ Xxx Xxxxxx
		Name:		Xxx Xxxxxx
		Title:		Vice President
		EMDCD LTD.
		By: Northern Trust Company, London Branch, as custodian for and on behalf of EMDCD Ltd.
		By:		/s/ Xxx Xxxxxx
		Name:		Xxx Xxxxxx
		Title:		Vice President
		FCI LTD.
		By:		/s/ Xxxxxx Xxxx
		Name:		Xxxxxx Xxxx
		Title:		Director
		XXXXXXX CAYMAN SPC NO. 3 LIMITED ON BEHALF OF AND FOR THE ACCOUNT OF AEI SEGREGATED PORTFOLIO
		By:		/s/ Xxxxx Xxxxx
		Name:		Xxxxx Xxxxx FCCA
		Title:		Director