Bogotá D.C., December 1st, 2015.

THE HON. FRANK MCKENNA, QC Independent Chairman of the Board BROOKFIELD ASSET MANAGEMENT Brookfield place, Suite 300 181 bay street Toronto, Ontario M5J 2T3, Canada

SUBJECT: BUYING OPTION OF ISAGÉN S.A. STOCK.

Mr. Mckenna:

Regarding the interest of BROOKFIELD ASSET MANAGEMENT in the buying option ISAGÉN S.A. stock, we will like to arise certain issues surrounding this operation en Colombia. In this matter we will like to inform you that the below signing eighty senators and house representatives from different parties of Colombia oppose the bid and sell of ISAGÉN stock, and this is why we have presented a bill that restricts the sale of stock options in public owned companies such as ISAGÉN S.A. In addition to this, we have presented lawsuits against this bid and sell option; actions that have been supported by various coalitions of formers employees, NGO’s, as well as the union of ISAGÉN. ISAGÉN S.A. is a strategic asset of the Colombian State, as well as an environmental, corporate and administrative icon of our nation. This is why we strongly disagree with any kind of sale, bid or partition of this company, and we are using every legal tool in order to prevent this from happening, due to the effects this might cause in our public finances and the generation of energy. We respectfully ask that, in observance of the publicity and transparency that have to surround this type of operations in a serious company as BROOKFIELD ASSET MANAGEMENT, this concerns are presented to the board of directors and the shareholders, in order to enlighten the actual situation of this operation in Colombia. Sincerely yours, Copy to board members: MR. J. BRUCE FLATT, MR. BRIAN LAWSON, MR. JACK COCKWELL, MR. A. SILBER, MR. JEFFREY (JEFF) BLIDNER, MR. SAMUEL (SAM) POLLOCK, MR. ROBERT (BOB) HARDING, MR. DAVID KERR, MS. ANGELA BRALY, MR. MARCEL COUTU, MS. V. MAUREEN DARKES, LL.D., DR. SEEK NGEE HUAT, LANCE LIEBMAN, DR. PHILIP LIND, PH.D., YOUSSEF NASR, LORD O’DONNELL, MS. DIANA TAYLOR, GEORGE TAYLOR.

Bogotá D.C., 1° de diciembre de 2015

Señor JORGE BERNARDO LARRAIN MATTE Presidente de Junta Directiva COLBÚN Avenida Apoquindo 4775 piso 11 LAS CONDES 7580097 CHILE Asunto: Opción de compra de ISAGÉN S.A. Señor Larrain: En relación con el interés de COLBÚN de participar en la opción de compra de acciones de ISAGÉN S.A., nos gustaría plantearle algunos aspectos relacionados con esta operación en Colombia. En relación con esta operación, le manifestamos que 80 senadores y representantes a la cámara de diferentes partidos políticos de Colombia suscribimos una declaración de oposición a la venta de las acciones ISAGÉN, razón por la cual presentamos un proyecto de ley que restringe las opciones de venta de acciones de empresas de propiedad pública tales como ISAGÉN. Por otra parte, hemos presentado demandas contra esta opción de venta, acciones que han sido apoyadas por diversos sectores tales como la asociación de antiguos empleados de la empresa, organizaciones no gubernamentales y el sindicato de ISAGÉN. ISAGÉN S.A. es un activo estratégico del Estado colombiano, así como un ícono ambiental, corporativo y administrativo de nuestra nación. Por esta razón estamos en total desacuerdo con cualquier tipo de venta, licitación o participación de esta empresa, y utilizamos todas las herramientas legales a uestor alcance para evitar que esto suceda, debido a los efectos que esto podría causar en nuestras finanzas públicas y en la generación de energía en el país. Teniendo en cuenta estas circunstancias, respetuosamente le solicitamos que, en cumplimiento de los criterios de apertura y transparencia que deben rodear este tipo de operaciones por parte de una empresa responsable como COLBÚN, la información aquí referida sea puesta en conocimiento de su junta de directores y de sus accionistas, con el fin de clarificar la situación real de esta operación en Colombia. Atentamente, Copia a miembros de Junta Directiva: Sr. Ignacio Cruz Zabala, Sr. Luis felipe Gazitua Achondo, Sr. Sebastian moraga, Sra. Paula Martinez Osorio, Sr. Rodrigo Perez Stiepovic, Sr. Mauricio Cabello Cadiz, Sr. Javier Cantuarias Bozzo, Sr. Nicolas Cubillos Sigall, Sr. Eduardo Lauer Rodriguez, Sr. Juan Andres Morel Fuenzalida, Sr. Juan Eduardo Vásquez Moya, Sr. Juan Eduardo Correa García, Sr. Juan José Hurtado Vicuña, Sr. Arturo Mackenna Iniguez, Sr. Eliodoro Matte Larrain, Sr. Eduardo Navarro Beltrán, Sra. Vivianne Blanlot Soza, Sr. Sergio Undurraga Saavedra.

Bogotá D.C., December 1st, 2015.

MR. GERARD MESTRALLET Chief Executive Officer Engie S.A. – GDF SUEZ S.A. 1 Place Samuel de Champlain, Courbevoie 92400 France

SUBJECT: BUYING OPTION OF ISAGÉN S.A. STOCK.

Mr. Mestrallet:

Regarding the interest of ENGIE S.A. – GDF SUEZ S.A. in the buying option ISAGÉN S.A. stock, we will like to arise certain issues surrounding this operation en Colombia. In this matter we will like to inform you that the below signing eighty senators and house representatives from different parties of Colombia oppose the bid and sell of ISAGÉN stock, and this is why we have presented a bill that restricts the sale of stock options in public owned companies such as ISAGÉN S.A. In addition to this, we have presented lawsuits against this bid and sell option; actions that have been supported by various coalitions of formers employees, NGO’s, as well as the union of ISAGÉN. ISAGÉN S.A. is a strategic asset of the Colombian State, as well as an environmental, corporate and administrative icon of our nation. This is why we strongly disagree with any kind of sale, bid or partition of this company, and we are using every legal tool in order to prevent this from happening, due to the effects this might cause in our public finances and the generation of energy. We respectfully ask that, in observance of the publicity and transparency that have to surround this type of operations in a serious company as ENGIE S.A. – GDF SUEZ S.A., this concerns are presented to the board of directors and the shareholders, in order to enlighten the actual situation of this operation in Colombia. Sincerely yours, Copy to board members: MS. ISABELLE KOCHER, DR. JUDITH HARTMANN, MS. VALERIE BERNIS, MR. HENRI DUCRE, MR. JEAN-CLAUDE DEPAIL, MR. JEROME TOLOT, MR. PIERRE CHAREYRE, MR. PIERRE MONGIN, MR. DIDIER HOLLEAUX, MR. YVES LE GELARD, MR. DIDIER RETALI, MR. JEAN-LOUIS BLANC, MS. CLAIRE BRABEC-LAGRANGE, MR. MARC FLORETTE, MR. PHILIPPE JEUNET, MR. PAUL RORIVE, MR. EDOUARD SAUVAGE, MR. RAPHAEL SCHOENTGEN, MR. DENIS SIMONNEAU, MR. WILLEM VAN TWEMBEKE, MR. ALAIN BEULLIER, MR. BRUNO BEZARD, MS. CATHERINE GUILLOUARD, MS. MARIE-NOELLE JEGO-LAVEISSIERE, MR. PHILIPPE LEPAGE, MR. LAURENT MICHEL, MS. ASTRID MILSAN, MS. ANNE-MARIE MOURER, MS. STEPHANE PALLEZ, MS. CAROLINE SIMON, MS. FLORENCE TORDJMAN, PROF. DR. ANN-KRISTIN ACHLEITNER, MR. EDMOND ALPHANDERY, MR. JEAN-LOUIS BEFFA, MR. ALDO CARDOSO, MS. BARBARA KUX, MS. FRANCOISE MALRIEU, MS. MARIE-JOSE NADEAU, LORD SIMON OF HIGHBURY