CEARÁ I

State of Ceará - Brazil

IMPSA is the most important developerof Wind Farms in Latin America

Wind Farms

We believe in the Power of Nature

(Praias de Parajurú, Praias do Morgado, Volta do Rio)

The project CEARA I is composed by three wind farms: Praias de Parajurú, Praias do Morgado and Volta do Rio, totalizing

100 MW. The wind farms are located in the CEARA state, region where the best winds of Brazil are found. Praias de Parajurú is located in Beberibe at about 280 Km from Fortaleza; Praias do Morgado is in Acaraú, at 280 Km from Fortaleza; finally Volta do Rio is also located in Acaraú, at about 220 Km from Fortaleza.

The undertaking was developed by Energimp, and IMPSA Energy's subsidiary, within the framework of PROINFA program (Program for the Promotion of Alternative Sources) in Brazil. The total investment amounts to R$ 550 millions.

Description

All the energy generated by these wind farms feeds the distribution grid in accordance with the Connection Contract

to the Transmission System (CCT). Praias de Prarajurú counts with two 69 kV transmission lines, one of 31.7 km

connected to the Aracatí substation and the other of 35.1 km long to the Beberibe substation. Praia do Morgado counts with one 69 KV transmission line of 22 km of extension, connected to the Acaraú II Substation and a 230 KV transmission line of 92 km long, connected to the Sobral III substation. Volta do Rio counts with one 69 KV transmission line, of 23 km long, connected to the Acaraú II substation, propriety of Volta do Rio and Praia do Morgado, and one 230 kV transmission line of 92 km long, connected to the Sobral III substation.

Praias de Parajurú Praias do Morgado Volta do Rio

Superficie ocupada (has)

Nº de aerogeneradores

Potencia unitaria (MW)

325

19

1.5

375

19

1.5

378

28

1.5

The main goal is to increase the offer of energy coming from sustainable sources. Its output allows providing power to more than 320,000 families, and prevents the consumption of 700,000 equivalent barrels of oil per year and avoids the emission of 34,000 tons of CO2 during the same period.

The wind generators of the three projects are distributed in such a way to maximize the wind in f luence , decreas ing aerodynamic losses. The area where the wind farms are established has a costal strip of land with northeast to southeast orientation with an extension of 3; 7.4 and 8 km approximately. Its direction is of

o130 related to the north, which is the opt imum or ienta t ion regard ing predominant alisios winds in the region. The terrain has a relatively simple relief with small dunes elevations with a height smaller than 20 m.

(*) Build, Operate, Own

Name

Country

Client

Scope of supply

Rated Installed Capacity

Average Year Production

Equivalent Energy

Volta do Rio

Brazil

ELETROBRÁS

BOO(*)

42.0 MW

174,963 MWh

305,400 BEP año

Praias do Morgado

Brazil

ELETROBRÁS

BOO(*)

28.8 MW

125,481 MWh

219,000 BEP año

Praias de Parajurú

Brazil

ELETROBRÁS

BOO(*)

28.8 MW

112,604 GWh

196,600 BEP año

The project's funding is made through private contribution, the credit coming from a financial institution and the signing

of a contract of buying and selling energy.

The stockholders of the project are IMPSA Energy (51%) and CEMIG (49%). Between the two companies were

invested R$ 550 M, R$ 175 M from their own capital and the rest through the financing with a 12 year loan at TJLP rate of

+2.5% granted by the Caixa Economica Federal .

IMPSA Energy develops power generation from renewable sources and CEMIG is the electric company of Minas Gerais,

one of the largest groups of electric energy of Latin America and the world leader in sustainability according to the

homonymous Dow Jones index of the New York stock exchange.

The funding base of this initiative is the 20 year Contract of Buying and Selling Energy (CCVE), signed with Centrales

Elétricas Brasileiras S.A. ELETROBRÁS, that regulates the purchasing and selling of the total annual energy generated in

accordance with the terms and conditions of the supply legally set forth by the PROINFA.

Funding

Engineering, Procurement,& Construction (EPC)

IMPSA Wind supplies wind farms under EPC conditions

and provides the related equipment under turn-key

conditions, wind generators, engineering and the

integration of the balance of plant. The farms are equipped

with wind turbines from IMPSA Wind of 1.5 MW, 77 m in

diameter and 85 m in height each. The project demanded

the provision of 66 units.

IMPSA Wind is the only manufacturer of high-power wind

turbines using proprietary technology in Latin America.

Nowadays IMPSA is one of only two providers of total

solutions for wind generation and hydropower worldwide.

Social and Economic AspectsRegarding social and economic terms, this initiative is deemed of relevant interest for municipalities and towns it will cover,

besides contributing to increase the demand of local labor manpower and strengthening the Gross Domestic Product

(GDP) of the region, highlighting the following benefits:

This project is yet another example of IMPSA's commitment to providing integrated

solutions for renewable power generation.

The construction of these wind farms has created about 2,000 jobs.

The Operation and Maintenance are carried out by IMPSA Wind. In order to achieve such purpose, the company has not

only skilled personnel but also a monitoring policy letting to acquire the status condition indexes of the generators and

performs a predictive maintenance that maximizes the generated energy of the wind farm. IMPSA's technology makes

possible the transmission of operating and status data of the generating units anywhere in the world, thereby enabling the

monitoring of its machines from the technology research center (CIT).

The experience in Latin America in these kind of projects indicates that one of the largest problems to achieve the

expected utilization factor is the availability of the wind generators. This situation is degraded due to the fact that the

necessary technical assistance and the spare parts are not supplied on time and in the right way. IMPSA Wind solves this

problem by means of the production centers located in Brazil, Argentina and Malaysia, providing the services needed by

the Client in the shortest delivery period, putting at disposition of the Client the services he requires in a time compatible

with the importance of supporting the wind farm energy offer in the awaited levels.

Operation and Maintenance (O&M)

Growth of the infrastructure;

Attraction of economic activities;

Creation of new direct jobs, increase of the regional income level;

Specialization of the regional manpower through training;

Contribution by means of the energy offer to the program “Light for Everybody”, which will supply electric energy to

12 million of Brazilians;

Improvement of the living conditions through the social benefit offered.

Characteristics Technical

Three independent systems of pitch control

Hydraulic, for rotor stop

Manually

Passive rectifying bridge (diodes). Three phase inverter commutated by IGBT's

45 - 65 Hz

620 Vac (1.5 MW)

- Characteristic LVRT- Internal/external Order of reactive power (variable power factor)- Breaking switch line side and generator side.

<5%

All specifications are subject to modification without prior notice.

Active System

Electric Motors

Exterior gear

3

0.5 º/s

360º

Yaw System Type

Design Concept

Bearings

Mechanisms quantity

Speed of the yaw

Operating range

77 / 77 / 70 m 24,657 / 4,657 / 3,848m

Clockwise

3

37.25 / 37.25 / 34.00 m

Glass Fiber and resin with protection against ultraviolet rays and atmospherics discharges

Variable Pitch

Rotor

Diameter

Swept Area

Direction of rotation

Blade's quantity

Blade's Length

Blade's Material

Power Control

Tubular steel, concrete or combined

85 / 85 / 65 m

4 / 4 / 3

Paint

Tower

Type

Height of the generator shaft

Sections

Anticorrosive Protection

DDPM (Direct Drive Permanent Magnet)

1,580 kW

Y 690 V

Passive system with air, IP 23 (EN-60529)

F

Generator

Type

Rated Power

Voltage

Cooling

Insulation Class

Design IMPSA - V

Microprocessed Monitoring and Control

Aerodynamic Brake

Mechanical Brake

Rotor lock

Braking System

Type

Line Frequency

Line Voltage

Power Filter with THD (Total Harmonic Distortion)

Others

Frequency Converter

Power Curve

Function

Control System

Design Concept

Reserve of Energy

Pitch

Independent drives with servomotors

Ultra-capacitors

1.5 MW

13 / 13 / 11.7 m/s

52.5 / 52.5 / 59.5 m/s

GL; IEC 61400-1

II-C / II-C / IC

General Data

Rated Power

Rated Speed

Survival Speed

Design Standards

Class

IMPSA V77 / V77 / V70Model

0.0

200.0

400.0

600.0

800.0

1000.0

1200.0

1400.0

1600.0

0 5 10 15 20 25

Pow

er

[KW

]

Wind speed [m/s]

V 77 / 77 / 70

Praias de Parajurú / Praias do Morgado / Volta do Río

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