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September 25, 2021

A performance for Romanian hydropower:The longest headrace tunnel

• The tunnel is 16.6 km long and has a diameter of 4 meters * Hidroelectrica’s investment stands at EUR 150 M

The inauguration of the longest headrace tunnel built in Romania after 1984 is taking place today, September 10, at the Pruncea intake point that is part of the Surduc-Siriu hydropower project. The Surduc-Siriu Hydropower Project spans the Buzau, Basca Mare, Basca Mica and Zabala rivers in the Buzau, Covasna and Vrancea counties and started in 1981.
The Surduc-Nehoiasu headrace tunnel brings water from the Surduc dam to the Nehoiasu hydropower plant and has a length of approximately 16.6 km, a discharge capacity of 40 cubic metres per second and a diameter of 4 meters. The tunnel has a concrete lining that is 30-35 centimetres thick. The construction of the tunnel was tackled through 8 worksites located in Basca Mare, Titilau, Pruncea, Trestia and Castel. The breakthrough of the last section of the tunnel (Trestia-Castel) is currently taking place, marking the completion of the 16.6-km tunnel that runs through the Buzau Mountains.
The completion of the Surduc-Nehoiasu branch will allow Hidroelectrica to install within the Nehoiasu Hydropower Plant the biggest electricity production capacity since the early the 1990s, the hydropower plant’s generator having an installed power of 55 MW and an estimated electricity production capacity of 171.8 GWh during an average hydrological year.
The Nehoiasu I Hydropower Plant has been operational, as part of the Surduc-Siriu Hydropower Project, since 1988, having 2 generators with a total installed capacity of 42 MW and an average production of 120.6 GWh per year.

Hidroelectrica to invest EUR 1.3 bln in development and technological upgrade in 2015-202

The investment in the Siriu-Surduc Hydropower Project is part of Hidroelectrica’s investment plan for 2015-2020.

The budget allocated by Hidroelectrica for the development-upgrading-maintenance works during 2015-2020 surpasses EUR 1.3 bln. They will be distributed as follows:
New hydropower plants: EUR 450 M for ongoing projects (Siriu-Surduc, Racovita, Bretea, Rastolita, Dumitra-Bumbesti etc.);
Technological upgrading of already existing hydropower plants: EUR 305 M for upgrading 4 high-capacity hydropower plants: Stejaru (210 MW), Vidraru (installed capacity 220 MW), Raul Mare Retezat (installed capacity 335 MW), Mariselu (installed capacity 220 MW) and modernization of hydropower plant generators;
Maintenance works on already existing hydropower plants: EUR 240 M;
Purchase and implementation of new production capacity from other renewable sources (wind, solar, biomass): EUR 300 M invested in new production capacities from renewable sources

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