Hitachi Energy wins order to upgrade world-record high-voltage direct current transmission system

Hitachi Energy, a global technology leader that is advancing a
sustainable energy future for all, announced it won an order to provide Taesa, one of
Brazil’s largest private electric energy transmission groups, with an extensive upgrade of the
Garabi high-voltage direct current (HVDC) converter station in Brazil. The link can transmit up
to 2,200 megawatts of electricity, making it the most powerful “back-to-back”1 HVDC system in
the world

This order underlines Hitachi Energy Service’s commitment to trusted long-term partnerships
and builds on our proven track record of delivering innovative and reliable energy service
solutions.

The Garabi converter station enables power exchange between Argentina and Brazil, which is
normally not possible as Argentina’s power system operates at 50 Hz, and Brazil’s operates at
60 Hz. The transmission system comprises 490 kilometers of alternating current overhead
lines between the substations in northern Argentina and southern Brazil and the HVDC
converter station at Garabi in Brazil, near the border.

The station began full commercial operation in 2000 and, after more than 20 years of operation,
the control and protection system will be upgraded with the latest MACH™ technology2 from
Hitachi Energy, which provides unequaled calculation capacity and enables a high degree of
integration and handling for all control and protection functions. This will be the first HVDC
upgrade in Brazil and will secure the electricity supply for the future while increasing reliability
and availability.

“Our transmission systems have been helping to secure power in Brazil for decades,” said
Niklas Persson, Managing Director at Hitachi Energy’s Grid Integration business. “We are
proud to support Taesa by providing our cutting-edge HVDC control system and Hitachi Energy
Service solutions, making the link more secure. Based on almost 70 years of experience, our
services will extend the system lifetime and improve its availability and reliability.”

“Our mission is to connect Brazil with safe and reliable electricity, generating value for society
and transmitting energy with excellence and quality,” said Emmanuel Pasqua de Moraes,
Expansion Planning and Engineering Executive Manager of Taesa. “Cross-border
interconnections such as Garabi are a key part of that mission and this Hitachi Energy HVDC
system is an important part of securing power for the Brazilian National Interconnected System
and with international connections increasing the energy security of our system.”

HVDC systems are commonly used for large-scale transmission and exchange of electricity
over large distances between two HVDC converter stations, but the Garabi HVDC converter
station is a back-to-back system in a single location.1 Back-to-back stations utilize the
sophisticated, digital controllability of an HVDC system to precisely manage the flow and
properties of the electricity supply, providing many benefits for grid control and stability.