Profile
Major Indicators
A Word from the CEO
Corporate Governance
Business of AES Tietê
Business Management
Intangible Assets
Economic and
Financial Performance
Capital Markets
Capital Expenditures
and Outlook
Environmental
Management
Social Management
Social Performance
Indicators
Financial Statements
Corporate Information
Home  Business Management
Economic Environment
In 2005, Brazil’s GDP grew 2.6%, according to estimates of the Central Bank. The unemployment
rate declined slightly, going from 10.2% in January/05 to 9.6% in December/05, according to
data from the Brazilian Institute of Geography and Statistics (IBGE). The consumption of energy rose
4.6% compared to 2004, driven by the commercial segment, which posted an increase of 7.2%.
This growth led the consumption of electric energy to return to the levels seen before rationing was
instituted in 2001 for the first time.
Electric Power Consumption| GWh
Jan|79 to Nov|05
Power Plant
 
 
Selic (1) (Basic Domestic Interest Rate)
Exchange Rate (1)
Local Currency(Real) Appreciation (1)
IPCA (Extended Consumer Price Index) (2)
IGP-M (General Price Index– Market) (2)
2004
 
18.00    
2.34    
11.82%
5.69%
1.21%
2005
 
17.75   
2.65   
8.13%
7.60%
12.42%
(1) End of Period
(2) Accumulated in the Period
The IGP-M (General Price Index – Market) and the IPCA (Extended Consumer Price Index),
which are part of the readjustment calculation for electric energy contracts ended 2005 with
accumulated rates of 1.12% (lowest annual rate of the historical series that began in 1989) and
5.69%, respectively. AES Tietê is only influenced by the IGP-M, because both the price of the
sale of its power as well as its financial commitments are pegged to this index.

The Selic, which is the basic interest rate for the economy, ended the year at 18.0% p.a.
The exchange rate for the U.S. dollar, which was R$ 2.67 on January 3, 2005, reached the
end of the year at R$ 2.34. Accumulated over 2005, the appreciation of the real was 11.8%.
The foreign exchange situation and of the Selic reflected a combination of factors, most notably
the real interest rates practiced in the country, the strong international liquidity, the setting
of consecutive trade balance records and the large volume of external funding operations by
public and private companies.
Business Performance
AES Tietê’s operations are regulated and inspected by Aneel. According to its concession contract,
the Company has a quota of 1,275 average MW of assured energy — an amount available for
sale in long-term contracts, generated by its 10 hydroelectric power plants.

In 2005, the Company sold 12,800 GWh of power, of which 11,200 GWh were sold through
Initial and Bilateral contracts, which is sufficient to supply more than 5 million homes.
The Bilateral Contract signed in 2000 with AES Eletropaulo absorbed 75% of this total.
Complying with the process for the deregulation of the energy sector, the Initial Contracts were
gradually reduced, as of 2003, by 25% in the annual volume of supply. In this process, 75% of the
assured energy in 2003 was destined for the distributors contracted before privatization;
50% of the production obtained in 2004; and 25% of the total generated in 2005. As of 2006,
all of the available energy for sale will be supplied to AES Eletropaulo under the Bilateral Contract.
Operational Management
The generation of 12,800 GWh during 2005 exceeded the volume registered the previous year
by 7.6%, and was 15% higher than the 11,100 GWh of assured energy determined by Aneel.

This performance was a consequence of an intense preventive maintenance program to
guarantee that the power plants maintained their reliability rates, one of the best in the
Brazilian electricity sector.
Commercial Strategy
In the commercial area, AES Tietê chose to keep a single contract for commercializing 1.268 MW,
nearly the totality of the assured energy established by Aneel. This option made the process simpler
and more predictable as the long-term supply conditions are determined by a single bilateral
contract, approved by the regulatory bodies. From the financial side, the guarantee of sales allows
the Company to develop long-term strategies without credit risks.

The price practiced by the contract with AES Eletropaulo was determined when it was signed
in 2000, having the normative value defined by Aneel as a reference, and thereafter it has been
adjusted by inflation. Nevertheless, the energy auctions held in 2005 presented prices lower than
the one contracted between AES Tietê and AES Eletropaulo reflecting the excess of energy available
since the last crisis, which shall not be maintained over the medium and long terms.

Therefore, having a pre-agreed price through 2015 means guaranteed revenues for AES Tietê and a
price hedge both for the generator, distributor and its consumers. The comfort on selling in the
long term grants the Company the availability of funds necessary to meet its financial commitments
generate value to its shareholders and carry out capital expenditures.
Risk Management
AES Tietê has adopted some procedures and initiatives to mitigate the risks inherent to the business,
always looking forward to increase, improve and add new methodologies, procedures and tools that
can reduce its exposure. Among these actions, the following are noteworthy:
Operational Risks
Product Risk
New coming generators into the Brazilian Interconnected System will not affect the performance of
the Company, which has its assured energy contracted until 2015.

Market Risk
The Bilateral Agreement works as a hedge, both for the volumes as well as for prices. There is a
risk of unexpected expenses, typical of the activities of the Company, but the operational margin
allows the Company to absorb any eventual need for extra disbursements, without major impacts.

Operational Risk
Operational failures may occur, with an impact both on equipment and volume of power generated;
but the financial consequences can be mitigated. The Company carries an insurance policy for
those dams that present greater hydrological risk and for its equipment, besides the
Energy Reallocation Mechanism (MRE). The MRE is a financial mechanism for risk sharing through
which all the volume generated above the assured energy by each power plant is “transferred” to
other plants whose performance was under the assured level at a minimum cost.
The liquidation is invoiced by the Electric Energy Wholesale Market (CCEE) at the end of each
accounting period.

Environmental Risk
There is a risk of contamination of the rivers due to oil spills and/or the incorrect disposal of wastes
during the operation and maintenance of the power plants. These risks are controlled by the
Environmental Management System implemented in 2002, and use of state-of-the-art technology.
In terms of its real estate holdings, the border of its reservoirs, considered to be Permanent
Preservation Areas, run the risk of invasion. In order to avoid this problem, the Company has a
Geographic Information System that allows the follow up and inspection of eventual
occupation of its land.

Climate/Disaster Risk
The risks stemming from climate change are considerably minimized by contingency plans,
insurance or backup systems. In the case of natural disasters, such as flooding that could damage
structures, an action plan is in place for opening up spillways. In situations of catastrophes,
there are no other feasible contingency plans. In order to reduce eventual losses of such risks,
the Company has insurance coverage for Operational Risks that protects equipment and
installations, and Civil Responsibility, which seeks to minimize damages caused to third parties.

System, Management or Control Risk
There is also the risk of failure in support systems, both operational and management. In such cases,
generating units can be operated via local panels, independent of Operations Center coordination.
Financial Risks
Interest and Inflation
The cost of AES Tietê’s debt is determined by fixed interest rates and its principal amount is
adjusted according to the IGP-M performance. The fluctuation of interest rates on the
domestic market has no direct influence on the results of the Company.
The Bilateral Contract is readjusted by the IGP-M, representing a natural protection for the
cost of the debt.

Liquidity
Since AES Tietê is a strong cash generator and as has a low need for capital expenditures,
its cash situation is comfortable, what minimizes liquidity risk.

Foreign Currency
The Company’s total debt is denominated in local currency as are overall revenues.
The exchange risk is associated only to investments denominated in foreign currency –
accounting for approximately 12% of total cash & equivalents, as of December 31, 2005.