In April 2017, a ceremony was held to celebrate the
commissioning of the Dariali Hydropower Project in the Republic of Georgia.
Many attended the ceremony marking the first carbon-neutral hydropower project
in the world, including Georgian Prime Minister, Giorgi Kvirikashvili. The
power station, an independent power project (IPP) developed through Dariali
Energy Ltd, was a joint venture involving three other firms: Georgian private
companies Peri Ltd and Energy LLC, and state-owned Georgian Energy Development
Fund (GEDF). The Dariali HPP gathers water from the Tergi River and directs it
through the headrace tunnel to the power house located near the
Russian—Georgian border. Each year, the site will generate 500 GWhs of
carbon-neutral energy, with 70 percent of power production occurring during the
country’s summer months.
Robbins also invested in the project by gaining equity
through supplying tunneling equipment and services in consortium with
contractor Peri. “Robbins understood the risk in the tunneling portion of the
project and we were compensated for taking on part of the risk. Peri is a
long-time customer, as we supplied a TBM to them 15 years ago for a small
project in Georgia. It was great to be invited to invest and risk share on this
project, and to work together again,” said Robbins President Lok Home. The 5 km
(3 mi) long headrace tunnel for the power station was bored with the use of a
5.5 m (18 ft) diameter Robbins Main Beam TBM starting in February 2012.
Due to the remote and mountainous location of the jobsite
160 km (100 mi) from the capital Tbilisi, the machine was shipped in pieces to
contractor Peri’s workshop, where they were refurbished under Robbins
supervision and then delivered to the site to be assembled. Each piece was
transported by truck down narrow, winding roads that eventually gave way to
dirt paths. Assembly at the jobsite was difficult, as the project site at a
1,700 m (1.0 mi) altitude was blanketed in snow and components arrived in
December. Bone-chilling temperatures often reached negative 15 degrees Celsius
(5ºF), and 40 below with the wind chill factor. Once the machine had launched,
it encountered difficult ground including slate, sandstone, limestone and malms
with fault zones.
“The main challenges we faced were boring the tunnel at a 6
percent incline and having restricted access to service the machine. There were
also two major landslides that delayed the project for over a year,” said Home.
After the first landslide, the access tunnel, which had allowed mud and water to
enter the power station, had to be relocated at a higher elevation and facing
away from the river valley. When the machine was nearing the end of its bore, a
second landslide blocked the exit portal for the machine as well as access to
the main highway. Despite these challenges, tunneling crews persevered and the
machine successfully holed through in October 2014.
Throughout the construction process, careful steps were
taken to minimize the carbon footprint. Although the plant’s energy production
is carbon emission free, construction of the plant was not. To offset these
emissions, 7,000 seedlings are being planted all around the area in a
reforestation effort. In years to come,
the trees will absorb enough carbon dioxide to compensate for the emissions
produced during the construction of the hydropower plant.
Overall, said Home, there is much to celebrate as the
project has immense benefits: “Not only does it provide affordable electrical
power for the country with essentially no pollution effects, but it also
provided jobs during construction and will continue providing jobs during its
operation and maintenance.” Visit www.therobbinscompany.com .20/17.