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Home  Economic and Financial Performance
Revenues
AES Tietê posted a record-breaking performance during 2005. With full operational stability
and all assured energy contracted, consolidated gross operating revenues reached R$ 1.3 billion,
an amount that was 28.1% higher than in 2004. Over 2005, the Bilateral Contract, with a
tariff higher than the Initial Contracts, represented 74.5% of the sales volume and 81% of the
Company’s gross revenues. Also contributing to the good performance during the period were the
annual readjustments of the Initial and Bilateral energy sales contracts, of 7.5% on an average;
the reversal of a provision of R$ 43.7 million and the recognition of regulatory assets regarding
the Initial Contracts.

Net revenues totaled R$ 1.2 billion, surpassing the mark of R$ 1 billion for the first time,
representing an increase of 24.4% over 2004. The increase of PIS and Cofins tax rates, which took
effect on the dates of the readjustment of the Initial and Bilateral Contracts during 2004,
raised the deductions on gross revenues from R$ 69.5 million in 2004 to R$ 124.9 million in 2005.
As a result of this change in tax rates, the increase in net revenues over the year was lower
than the increase in gross revenues.
Operating Costs
Operating costs totaled R$ 344.9 million in 2005, an increase of 28.8% compared to 2004.
The main changes were the result of:
— Operating Provisions: totaling R$ 76.6 million in 2005, these provisions refer to the
registration of possible losses of credits related to the Extraordinary Tariff Reset (RTE),
investments with Banco Santos and the renegotiation of an equipment supply contract.

— Financial Compensation for the Use of Water Resourcess: with an increase of the
reference tariff rate by 19.2% and rise of 7.6% in the volume of power generated,
this account rose R$ 10.0 million, or 28.2% compared to 2004.

— Personnel: the rise in the number of employees and the increase mandated by a
collective bargaining agreement applied as of July 2005 led to R$ 5.0 million (19.1%)
higher payroll costs in 2005.

— Other Costs: partially compensating for the increase of some items in the Company’s costs,
the ending of the obligation to pay the Public Asset Use Fee made it possible to reduce the
this account by R$ 15.9 million, or 46.2%.
Ebitda
Operating cash flow generation as measured by EBITDA (earnings before interest, taxes,
depreciation and amortization) totaled R$ 939.1 million in 2005, an increase of 20.9%
compared to the previous year. The posting of higher operating provisions permitted a
reduction of 2.2 percentage points in the EBITDA margin, which reached 77.0%.
Financial Performance
AES Tietê’s net financial expenses in 2005 declined 78.1% over the previous fiscal year,
totaling R$ 64.2 million. This performance was influenced both by the reduction in
expenses as well as the increase in income.

Accrued financial expenses totaled R$ 166.3 million, which was the equivalent to a 49.4%
reduction over 2004, mainly reflecting the decline in monetary variation,
from R$ 170.8 million in 2004, to R$ 6.1 million in 2005. The strong variation was a
consequence of the decline in the IGP-M, the index that adjusts the Company’s main debt,
which went from 12.4% in 2004 to 1.2% in 2005.

Simultaneously, financial income grew 189.9%, going from R$ 35.2 million in 2004 to
R$ 102.0 million in 2005, due to the increase in investments in securities linked to the
CDI (Interbank Deposit Certificate ) and the high yield rates during 2005.
The balance of financial income also included gains through monetary adjustment of the
RTE receivables, in the amount of R$ 31.0 million.
Net Income
Net earnings in 2005 totaled R$ 556.1 million, an increase of 90.7% compared to in the
R$ 291.5 million reported the previous year. The net margin was 45.6%, which represented an
increase of 15.9 percentage points over 2004.
Cash Flow
AES Tietê’s characteristic of strong cash generation led to a cash balance at the end of 2005 of
R$ 794.5 million, which was 62.4% higher than the position at December 31, 2004,
after the payment of all of the Company’s obligations. The principal disbursements during the year
included payment of R$ 321.1 million as compensation to shareholders and R$ 130.9 million
regarding debt amortization.
Debt

By the end of the year, the Company’s net debt totaled R$ 676.5 million, with a reduction of
R$ 419.8 million compared to the position at December 31, 2004. This decline was the result of the
settlement of a debt inherited from the Fundação Cesp (FunCesp II) at the time of privatization and
greater volume of funds due to the strong generation of cash and increase in the volume of
investments on the financial market. The reduction of the debt and associated increase in the
EBITDA in 2005 led to a strong decline in the Company’s leveraging, represented by the
net debt/EBITDA ratio.

AES Tietê carries no bank financing on its books. Its major debt consists of a loan agreement
with Eletrobrás, a legacy from the privatization process maturing in 2013 whose balance was
R$ 1.5 billion at the end of 2005. Interest is 10% annually, with the principal amount
adjusted annually according to the variation in the IGP-M.

The Company also maintains another obligation, also inherited from privatization,
with the institutions that manages its benefits plan (Fundação Cesp). The FunCesp III debt,
deriving from the debt assumption for financing the actuarial deficit of the Settled Proportional
Supplementary Benefit (BSPS), will mature in 2017. The balance of this loan is adjusted
according to the actuarial cost variation or the general price index (IGP-DI), whichever is the
higher, plus annual interest of 6%. On December 31, 2005, the balance of this debt totaled
R$ 17.2 million, of which 91.7% matures over the long-term.