An investment of over US$450M, the Chacayes run-of-river power plant was officially opened in October 2011. The plant is able to generate enough clean energy to supply more than 300,000 Chilean homes.

“Our team is very proud to receive this accolade,” said Pacific Hydro CEO Rob Grant. “This award recognises the sustainable development measures we put in place in the early design stages of the project to comply not only with Chilean environmental regulation and our own Health, Safety and Sustainability policy, but also with the Equator Principles and the Kyoto Protocol Clean Development Mechanism eligibility requirements.”

The innovative environmental initiatives at the Chacayes project represented an investment of over US$10M and included:

• Utilisation of low height intakes, instead of large dams, in line with the Kyoto Protocol standards;

• Tunnelling works using a tunnel boring machine (TBM) to minimise environmental impacts;

• Continuous monitoring of the native fauna during the construction of the project and also during the operations phase;

• Implementation of a Community Management Plan to anticipate, avoid or mitigate social impacts and also to manage complaints in neighbouring rural and urban areas;

• Development of a nursery fully managed by community members for reforestation, which created training and employment opportunities and allowed the production of approximately 400,000 native plants and trees;

• Construction of a 66kV power line which allowed the supply of electricity throughout the construction stage from another run-of-river hydro project to minimize the use of diesel generators;

• Construction of new access roads and widening of an existing bridge that improved access to the remote region where the project activity took place;

• Construction of a 2.6km tunnel instead of a free flow canal to connect the two intakes of the project to minimize the impact on a National Reserve, which added US$5 million to the cost of the project; and

• Painting of some of the transmission line towers to mitigate visual impacts.

In addition to its commitment to the environment, Pacific Hydro has created positive outcomes for the local communities.

“At the peak of its construction, the Chacayes project created approximately 2,000 direct and 3,000 indirect jobs,” explained Grant. “We also developed an annual training program for the community and created an ongoing community fund called Creciendo Juntos to sponsor projects in education, health and the welfare of the local communities.”

Hosted by the New Civil Engineer and Ground Engineering magazines, the International Tunnelling Awards showcase and reward outstanding projects and achievements in the global tunnelling industry.