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<PAGE>
Exhibit A-1
___________________________________________
| Reliant Energy, Incorporated |
|_________________________________________|
| 100%
___________________________________________
| Reliant Energy |
| International, Inc. |
|_________________________________________|
|
| 99%
___________________________________________
| Reliant Energy |
| Santiago del Estero, S.A. |
|_________________________________________|
|
| 90%
___________________________________________
| Empresa Distribuidora de |
|Electricidad de Santiago del Estero, S.A.|
|_________________________________________|
<PAGE>
Exhibit A-2
_____________________________
| Reliant Energy, |
| Incorporated |
|___________________________|
|
|
|
| 100%
______________|______________
| Reliant Energy, |
| International, Inc. |
|___________________________|
|
|
|
|
| 100%
______________|______________
| Reliant Energy, |
| Light, Inc. |
|___________________________|
|
|
____________________|
| |
| | 100%
| |
| _____________________________
| | Reliant Energy |
|_____| Cayman |
| | Holdings, Ltd. |
| |___________________________|
| |
| |
| |
| |
| |___________________
| 100% |
| _____________________________ |
| | Reliant Energy | |
|_____| Cayman | |
| Investments, Ltd. | |
|___________________________| |
| |
| |
| |
____________________| |
| 1% | 99% |
| ______________|______________ |
| | Reliant Energy | |
|_____| Cayman |____|
| | Acquisition, Ltd. | |
| |___________________________| |
| | |
| | |
____|___________________| |
| | 1% | 99% |
| | ______________|______________ |
| | | Reliant Energy | |
| |_____| Cayman, Ltd. |____|
| |___________________________|
| |
| |
| 1% | 12%
| ______________|______________
| | Light |
|_________| Servicos de |
| Electricidade S.A. |
|___________________________|
|
|
|
|___________________
| 99% |
______________|______________ |
| LightGas | |
| Ltda. |____|
|___________________________|
|
|
|
| 78%
______________|______________
| Eletropaulo- |
| Metropolitana |
| Eletricidade, de |
| Sao Paulo S.A. |
|___________________________|
<PAGE>
Exhibit A-3
Reliant Energy,
Incorporated
|
| 100%
___________|___________
| Reliant Energy |
| International, Inc. |
|_____________________|
|
|
___________________________|_________________________
| 100% 100% |
________|_________ ________|_________
| Reliant Energy | | Reliant Energy |
| Caribe Ltd. | | Colombia Ltd. |_____
|________________| |________________| |
| | |
| | |
| 50% | 50% |
| | |
________|_________ ________|_________ |
| HIEDC Holdings | | Valle Energy | |
| Ltd. | | Ventures, Inc. | |
|________________| |________________| |
| | |
| | |
| 100% | 45% |
________|_________ ________|_________ 6% |
| Caribe Energy | | EPSA |____|
| Holdings Ltd. | | |
|________________| |________________|
| |
| |
| |
| |
________|_____________________ |
| | |
70%| |69% |
____|___________ _________|_______ |
| Electrocosta | | Electricaribe | |
|______________| |_______________| |
|
|
|
|
_______________________________________________________|_____________
| 99% | 86% | 7% 5% | | 5%
____|______ ____|____ _____|__________ ___________|____ ____|___________
| Central | | CET | | Gases de | |Interconexion | |ISA Generacion|
| Hidro | | | |Occidente S.A.| |Electrica S.A.| | S.A.E.S.P. |
|_________| |_______| |______________| |______________| |______________|
<PAGE>
Exhibit A-4
____________________
| Reliant Energy |
| Incorporated |
|__________________|
|
|
|
| 100%
|
________|_____________ ____________________ ____________________
| Reliant Energy | | CEDC | | EDC |
|International, Inc. | | |----| |
|____________________| |__________________| |__________________|
| |
| |
| |
| 100% | 100%
________|_________________ _________|____________
| Reliant Energy Salvador| | EDC Energy |
| Holding Company Ltd. | |Ventures-El Salvado |
|________________________| |___________________ |
\ /
\ /
\ /
\ 50% 50% /
_\_____________/__
| El Salvador |
|Energy Holdings |
|________________|
/ \
/ \
/ \
/ 75% \ 89%
/ \
__________________/____ ___\________________
| Alumbrado | | Oriente |
|_____________________| |__________________|
|
|
|
98% |
________|______________
| Usulutan |
|_____________________|
<PAGE>
Exhibit A-5
__________________________
| Reliant Energy, |
| Incorporated |
|________________________|
|
| 100%
_____________|____________
| Reliant Energy |
| International, Inc. |
|________________________|
|
| 100%
_____________|____________
| Reliant Energy |
| International II, Inc. |
|________________________|
|
| 100%
_____________|____________
| Houston Industries |
| Energy-India, Inc. |
|________________________|
|
| 100%
_____________|____________
| Houston Industries |
| Energy-Rain, Inc. |
|________________________|
|
| 25%
_____________|____________
| Rain Calcining |
| Limited |
|________________________|
<PAGE>
Exhibit A-6
__________________________
| Reliant Energy, |
| Incorporated |
|________________________|
|
|
|
| 100%
_____________|____________
| Reliant Energy |
| Resources Corp. |
|________________________|
|
|
|
| 100%
_____________|____________
| Reliant Energy |
| Latin America, Inc. |
|________________________|
|
|
|
|
17% |
__________________________ |
| Gas Natural | |
| del Centro, |__________|
| S.A.E.S.P. | |
|________________________| |
|
|
|
|
17% |
__________________________ |
| Gas | |
| del Risaralda |__________|
| S.A. E.S.P. | |
|________________________| |
|
|
|
|
34% |
__________________________ |
| Gases del Norte | |
| del Valle S.A. |__________|
| E.S.P. | |
|________________________| |
|
|
|
25% |
__________________________ |
| Gases del | |
| Quindio S.A. |__________|
| E.S.P. |
|________________________|
<PAGE>
Exhibit A-7
__________________________
| Reliant Energy, |
| Incorporated |
|________________________|
|
|
|
| 100%
_____________|____________
| Reliant Energy |
| Resources Corp. |
|________________________|
|
|
|
| 100%
_____________|____________
| Reliant Energy |
| Latin America, Inc. |
|________________________|
|
|
| 100%
_____________|____________
| Reliant Energy |
| Tampico 1 Ltd. |
|________________________|
|
|
|
|______________________
100% |
__________________________ |
| Reliant Energy | |
| Tampico 2 Ltd. |_________|
|________________________| |
| |
| |
| |
0.1% | 99.9% |
_____________|____________ |
| HI Energy de | |
| Mexico, S. de |_________|
| R.L. de C.V. |
|________________________|
|
|
|
_____________________|
| 50%
| __________________________
| | Gas Natural del Rio |
|______ | Panuco S. de |
| | R.L. de C.V. |
| |________________________|
| |
| |
| |
| | 99%
| _____________|____________
| | Servicios |
|______ | GNP, S.A. de |
| C.V. |
|________________________|
<PAGE>
Exhibit A-8
<TABLE>
<CAPTION>
<S> <C>
________________________________
| Reliant Energy Incorporated |
|______________________________|
| 100%
________________|_______________
| Reliant Energy Power |
| Generation, Inc. |
|______________________________|
| 100%
________________|_______________
| Reliant Energy Capital |
| (Europe), Inc. |
|______________________________|
| 100%
________________|_______________
| Reliant Energy |
| Europe Inc. |
|______________________________|
|
_____________________|____________________
100% | | 100%
____________|________ __________|____________
| Reliant Energy | | Reliant Energy |
| Wholesale(Europe) | | Europe Inc. |
| Holdings BV | 99.5% | (Dutch Branch) |
|___________________| Limited Partner |_____________________|
| __\________________________/ |
0.5% | / \__________________________________ | 99.5%
General Partner | / 0.5% General Partner \ | Limited Partner
________________|___/______ _____\|___________________
|Reliant Energy Wholesale | | Reliant Energy |
|(Europe) Holdings II C.V.| | Wholesale (Europe) CV |
|________________________ | |________________________|
| |
48% | 52% |
| |
|________________________________|
| Reliant Energy UNA B.V. |
|________________________________|
|
|
|
|
|
|
| 100%
_______________|_______________
| UNA |
|_____________________________|
</TABLE>
|
|