With the professionalism and efforts of Construction Joint Stock Company 47 and the supervision and construction units … Phase 1 of Bac Ai Pumped-Storage Hydropower project is the work cluster of Discharge gate which is now complete in terms of key work items and expected to be inspected in mid-March 2021, 15 days ahead of schedule.

Bac Ai Pumped-Storage Hydropower Plant is on the list of power source projects approved by the Prime Minister in Decision No. 428 / QD-TTg dated March 18, 2016 Approving the adjusted electricity development planning for the period 2011 – 2020 with a vision to 2030 (Power Development Plan VII adjusted). This is the first pumped hydropower project in Vietnam, invested by Vietnam Electricity (EVN).

The project is implemented in 2 phases, in which the outlet cluster is the Phase 1 of the project, approved by EVN in Decision No. 398 / QD-EVN dated October 9, 2019. Phase 1 has a total investment of 185 billion VND, started construction from January 2020; Construction Joint Stock Company 47 is the main construction contractor. All the items of this discharge outlet cluster are located in the riverbed of Cai River which is the lower lake of pumped – storage hydropower plant. Phase 1 is planned to be completed in the first quarter of this year in order to ensure synchronism with the progress of the reservoir impoundment of Cai River’s lake under the Tan My Irrigation System project invested by the Ministry of Agriculture and Rural Development (Cai River’s lake will start water storage in early April 2021).

Despite many challenges due to the COVID-19 epidemic in 2020 along with many years of experience in the fields of Hydropower, Industrial construction … Construction Joint Stock Company 47 has closely coordinated with the consulting unit of supervision, construction, representative of the investor … to follow the set progress. During the Tan Suu Lunar New Year holiday in 2021, the units also gathered human resources, conducted 3 consecutive shifts to complete the project on schedule. Thanks to that professionalism and efforts, 100% of the main work items such as: Discharge hatch, outlet, forcebay and downstream discharge channel have been completed. The project is completing the remaining works: Return the work site, complete the landfill area; relocation of tents, auxiliary, concrete mixing plant … It is expected that the discharge gate cluster will be completed in mid-March 2021, 15 days ahead of schedule.

Phase 2 of the project is the key work items; and the remaining synchronous works will be constructed in early 2022 to ensure the progress of power generation in December 2026. The entire Bac Ai Pumped-Storage Hydropower project is expected to be completed by the end of 2028. Currently, the survey and bidding to choose the technical design consultant for phase 2 has been completely prepared.

Bac Ai Pumped-Storage Hydropower Project with a capacity of 1,200 MW – is the largest pumped-storage hydropower project in Southeast Asia, with a total investment of about VND 21,100 billion. The project uses the water source of Cai River’ lake belonging to Tan My irrigation system to pump up the lake to accumulate water for electricity generation through 2 parallel tunnels with a diameter of 5.5-7.5m with a total length each tunnel is more than 2.7km. When put into operation, the plant will help reduce the difference in the load chart when mobilizing pump capacity during off-peak hours and generating electricity at peak hours, thereby helping to stabilize the system and ensure the national electricity system to be in stable, safe and reliable operation. This is very meaningful in the context of rapidly growing renewable energy sources, many solar and wind power plants with large installed capacity continue to be invested and put into operation.

By the end of February 2021, regarding Tan My Irrigation Project, Construction Joint Stock Company 47 (the leader of Joint Venture) has completed key work items in the project: conducting the roller compacted concrete of the main dam right and left abutment to the EL.197.20 meters; executing lining concrete of the main dam right abutment from the 11^th to 24^th compartment and the 1^st to the 10^th compartment for the main dam left abutment, concrete of the spillway dam and the whole systems of diversion drainage, upstream wall, downstream wall and the back yard of the main dam.

In the future, Construction Joint Stock Company 47 will make consistent concentration on manpower and construction equipment to set up pin pillars, adjacent piers of the spillway dam; finish beam casting and installation for transportation bridges; complete construction of operation house, diversion drainage and remaining items in order to put the project in operation.

On January 10, 2021, the Commencement ceremony of Hoa Binh Hydropower Plant was held in Hoa Binh. This is a special grade project, built on the main stream of Da River, in Hoa Binh city. Prime Minister Nguyen Xuan Phuc attended and issued a groundbreaking order.

Attending the ceremony were Mrs. Truong My Hoa – Former Secretary of the Party Central Committee, former Vice President of the Socialist Republic of Vietnam; On behalf of Central leaders, there were representatives of leaders of the Government Office, Central Ministries, Departments, Branches, State Capital Management Committee in enterprises. Regarding the leaders of Hoa Binh province, there were: Mr. Ngo Van Tuan – Secretary of Hoa Binh Provincial Party Committee; leaders and former leaders of the Provincial Party Committee, the People’s Council, the People’s Committee, departments, and departments of Hoa Binh province; On the side of Vietnam Electricity, there were: Mr. Duong Quang Thanh – Secretary of the Party Committee, Chairman of the Board of Members; Mr. Thai Phu Ne – Former Member of the Party Central Committee, Former Minister of Energy; On the side of Construction Joint Stock Company 47 (Contractor consortium member), there were Mr. Truong Nhat Quang – Advisor to the Board of Management (BOM); Mr. Le Trung Nam – Chairman of the Board of Management; Mr. Pham Nam Phong – Vice Chairman of the Board of Management; Mr. Ta Nam Binh – Member of the Board of Management cum Head of Internal Audit Committee; Mr. Duong Minh Quang – Member of the Board of Management cum General Director, Mr. Nguyen Huu Hai – Member of the Board of Management cum Deputy General Director; Head and Deputy Head of functional departments of the Company; Unit Representatives of Design Consulting, Supervisory Consulting and inhabitants in the project area.

The Hoa Binh Hydropower Plant Expansion Project is built on the right bank of the existing Hoa Binh hydroelectric dam. The Powerhouse is in the territory of Phuong Lam ward. The Intake gate and inlet canal are located in Thai Binh ward, Hoa Binh city, Hoa Binh province. The project has been approved by the Prime Minister in terms of the Pre-Feasibility Study Report, invested by Vietnam Electricity (EVN), and assigned Power Project Management Unit 1 to represent the Investor. The project has a total capacity of 480MW, including 2 units, each with a capacity of 240 MW. The average annual power generation output is about 488.3 million kWh / year. The project is predicted to bring about efficiency after its completion and on the operation such as: Increasing the capacity of generating peak coverage capacity for the national power system, creating favorable conditions maximize the annual discharge of excess water in the flood season of the existing Hoa Binh hydropower plant to generate electricity; Improving frequency regulation and stability capacity of the national power system; contributing to cost reduction of the system; Reducing the working intensity of the existing units, thereby prolonging the life of equipment, saving maintenance and repair costs.

To participate in the construction of this project, Construction Joint Stock Company 47 previously participated in the construction of numerous key national projects, invested by Vietnam Electricity, as follows: Dong Nai 4 Hydropower Project (Dak Nong Province); Srepok 4 Hydropower Project (Dak Lak Province); Da Nhim Hydropower Plant Expansion Project (Lam Dong and Ninh Thuan Provinces); Thuong Kon Tum Hydropower Project (Kon Tum province); Song Bung 2, Song Bung 4A and Song Bung 5 (Quang Nam province); A Luoi Hydropower Plant (Thua Thien Hue province); Trung Son Hydropower Project (Thanh Hoa province) … The works are highly appreciated by the Investor for quality, progress and art.

According to the projected progress, Unit 1 of the project will generate electricity in the third quarter of 2024, unit 2 will generate electricity and be completed in the fourth quarter of 2024. After completion, The Existing and the new hydropower plants will reach the capacity of 2400 MW.

* / A series of photos of Construction Joint Stock Company 47 at Commencement Ceremony

On December 16^th, 2020, the Break-through Ceremony of Da Nhim Hydropower Plant Expansion Project took place at D’Ran Town, Don Duong Commune, Lam Dong Province with participation of reprentatives from Da Nhim – Ham Thuan – Da Mi Hydropower Joint Stock Company under Electricity Generation 1, Construction Joint Stock Company 47, and oher related-parties.

The Da Nhim Hydropower Plant Expansion Project contributes a design capacity of 80MW, increasing the total capacity of Da Nhim Hydropower Plant from 160MW to 240MW. The amount of electricity will rise an annual average of 99 million kWh. According to the approved plan, the project will keep the existing reservoir, spillway dam and construct additional work items such as: Inlet Channel – Intake; Pressure Tunnel, Surge Tank; Valve House; Penstocks; Powerhouse – Renovation of Outlet Channel; Expansion of the Current Switchyard.

In accordance with the design of Da Nhim Hydropower Plant Expansion Project, the Supply Channel has 4.885 meters in length (constructed by TBM technology). However, after having bored 3.739 meters, the construction process encountered geologic difficulties, therefore the remaining tunnel was executed by the Drilling and Blasting Method (DBM), starting from February 2020. After 10 months, the tunnel breakthrough was eventually completed on 14/12/2020, two months earlier than expected, with volume of 929 md. This event marks a fundamental milestone signifying the begining of permanent support phase. The project is expected to be completed by 7/2021.