The project will deliver a new 76.9 MWe plant, with a headrace tunnel of about 16 km, an intake chamber with gate shaft and gate at the upstream end, and an underground powerhouse cavern at the downstream end with a tailrace tunnel that feeds out to the lake Kangerluarsunnguup Tasersua, which also is the intake reservoir for the existing Buksefjorden plant (HPP1).
The contractor must prepare a project proposal and a construction project for the client to comment on and obtain approvals from all relevant authorities. The project proposal must include all important conditions related to the construction of the hydropower plant, including all associated temporary and permanent structures, constructions, and mechanical and electrical installations.
The contractor must ensure that HPP3 is designed and constructed to maximize the present energy consumption value for the first 25 years of operation and meet the electricity needs of the city of Nuuk. The contractor will be responsible for the overall project design and execution, and comprising the construction of various buildings and civil engineering structures, including roads, portal buildings, tunnels, intake and gate shaft, the powerhouse as well as demolish existing dams, and must supply, install and test the mechanical and electrical equipment, including turbines, generators, GIS-transformers and other high voltage equipment, switchgear, and control and protection systems.
The contractor must also design and construct a new 132 kV overhead transmission line connecting HPP3 to the existing HPP1, which must be capable of transmitting the generated power to HPP 1 and to Nuuk.
The contract is based on the general conditions for design and build contracts (ABT 18) issued by the Danish Ministry of Transport, Building and Housing in June 2018.
This expansion aims to increase the peak output from 45 MWe to 120.9 MWe by adding 75.9 MWe (three units of 25.3 MWe). The project includes the construction of a new ~16 km headrace and tailrace tunnel between the Isortuarsuup Tasia (ISTA) and Kangerluarsunnguup Tasersua (KANG) reservoirs, which will increase the average projected available water volume to KANG storage from 352 x 106m3 to 1248 x 106m3.
HPP3 will be positioned approximately 34 km east of HPP1 and will connect to HPP1 through a new transmission line and a new gas insulated switchgear (GIS) substation near HPP1. The new line and substation is also part of the project. The current overhead transmission line from HPP1 to Nuuk has a design capacity of 100 MVA, and with a new HPP3 the energy potential will rise from 255 GWh/year to a maximum of 660 GWh/year with the existing overhead transmission line.
The tender notice can be viewed on the EU’s procurement platform, at: https://ted.europa.eu/en/notice/-/detail/751709-2024. Information about restricted documents can be downloaded from: https://field.dalux.com/client/da-dk/public/tender/TID-36258. The address for submissions is: https://field.dalux.com/client/da-dk/public/tender/TID-36258.
For further information, contact: Erlingur J Leifsson, NunaGreen Construction A/S, c/o NunaGreen A/S, Indaleeqqap Aqqutaa 12, kld., Nuuk 3900, Greenland Tel: +2 99552595; Email: ejl@nunagreen.gl; Website: www.nunagreen.gl
