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Bui Dam
View on WikipediaThe Bui Dam is a 400-megawatt (540,000 hp) hydroelectric project in Ghana. It is built on the Black Volta river at the Bui Gorge, at the southern end of Bui National Park. The project was a collaboration between the government of Ghana and Sino Hydro, a Chinese state-owned construction company. Construction on the main dam began in December 2009. Its first generator was commissioned on 3 May 2013,[4] and the dam was inaugurated in December of the same year.[5]
Key Information
Bui is the second largest hydroelectric generating plant in the country after the Akosombo Dam. The reservoir flooded about 20% of the Bui National Park and impacted the habitats for the rare black hippopotamus as well as a large number of wildlife species. It required the resettlement of 1,216 people,[6] and affected the lives and livelihoods of many more.
History
[edit]The Bui hydro-electric dam had first been envisaged in 1925 by the British-Australian geologist and naturalist Albert Ernest Kitson when he visited the Bui Gorge. The dam had been on the drawing board since the 1960s, when Ghana's largest dam, the Akosombo Dam, was built further downstream on the Volta River. By 1978 planning for the Bui Dam was advanced with support from Australia and the World Bank. However, four military coups stalled the plans. At the time Ghana began to be plagued by energy rationing, which has persisted since then. In 1992, the project was revived and a first feasibility study conducted by the French firm Coyne et Bellier.[7]

In 1997 a team of students from Aberdeen University carried out ecological investigations in the area to be flooded by the reservoir.[8] The Ghanaian environmental journalist Mike Anane,[9] who was included in UNEP’s Global 500 Roll of Honour for 1998, called the dam an "environmental disaster" and a "textbook example of wasted taxpayer money".[10] In his article he quoted the investigation team, but apparently somewhat exaggerated the environmental impact of the dam. The leader of the investigation team, the zoologist Daniel Bennett, clarified that "the opinions (Anane) attributes to our team are unfair and misleading". He added that "Contrary to Mr Anane's claims, we are unaware of any globally endangered species in Bui National Park, nor did we claim that the dam would destroy the spawning runs of fish."[11] Although Bennett always maintained a neutral stance towards the construction of the dam, in April 2001 the government of Ghana banned him from doing further research on the ecology of the Bui National Park. The government stated that the issue was "very sensitive" and Bennett's "presence in the National Park was no longer in the national interest". One of the journalist who criticized the government for banning Bennett was Mike Anane.[12]
In 1999 the Volta River Authority, the country's power utility, signed an agreement with the US firms Halliburton and Brown and Root to build the dam without issuing a competitive bid.[7] In December 2000 President Jerry Rawlings, who had ruled the country for the two previous decades, did not contest in elections (as per the constitution) and his party lost to the opposition led by John Kufuor. In October 2001 the new government shelved the dam project. According to Charles Wereko-Brobby, then President of the Volta River Authority, Bui Dam was not considered the least–cost option and could not meet "immediate" energy needs. Instead gas-powered thermal power plants were to be built, producing electricity at what was said to be half the cost of Bui. Furthermore, a severe drought in 1998 exacerbated the energy crisis due to low water levels in Akosombo Dam. As a consequence, the government wanted to reduce its dependence on hydropower at the time.[13]
However, in 2002 the project was revived. An international call for tender was issued, but only a single company submitted a bid and the tender was cancelled. In 2005 the Chinese company Sinohydro submitted an unsolicited bid for the dam together with funding from the Chinese Exim Bank. The government accepted the bid and the Ministry of Energy signed contracts for an environmental impact assessment in December 2005, as well as for an updated feasibility study in October 2007. The government created the Bui Power Authority in August 2007 to oversee the construction and operation of the project and the associated resettlement. Responsibility for the dam was thus transferred from the Volta River Authority, which until then had been responsible for the development and operation of all power projects in Ghana.[7] Coyne et Bellier is the consulting engineer for the dam.[14]
Field investigations for the dam began in October 2007. In January 2008 preparatory construction began and in May 2008 the first people were resettled. In December 2008 the river was diverted and a year later construction on the main part of the dam began. The filling of the reservoir began in June 2011.[15] Unit 3 was connected to the grid on 3 May 2013; Units 2 and 1 were commissioned by the end of November 2013.[16] The dam and power station were inaugurated in December 2013 by President John Mahama.[5]
To boost the Bui dam's overall electricity generation without affecting the water reservoir, a 50-megawatt (MW) solar power plant was built on land 3km from the dam. The solar plant was commissioned in November 2020.[17]
Design
[edit]The Bui Dam is a gravity roller-compacted concrete-type with a height of 108 metres (354 ft) above foundation and 90 metres (300 ft) above the riverbed. The crest of the dam is 492 metres (1,614 ft) meters long and sits at an elevation of 185 metres (607 ft) above sea level (ASL). The main dam's structural volume is 1 million cubic metres (35×106 cu ft). Southwest of the dam two saddle (or auxiliary) dams maintain pool levels and prevent spillage into other areas of the basin. The first and closest to the main dam is Saddle Dam 1. It is 500 metres (1,600 ft) southwest of the main dam and is a rock-fill embankment dam. The dam rises 37 metres (121 ft) above ground level and has a crest length of 300 m (984 ft). 1 kilometre (0.62 mi) southwest of the main dam is Saddle Dam 2. This dam is a zoned earth-fill type with a height of 7 metres (23 ft) ASL and a crest length of 580 m (1,903 ft). Both saddle dams have a crest elevation of 187 metres (614 ft) ASL.[3]
The dam's spillway near the right bank consists of five radial gates, each 15 metres (49 ft) wide. The spillway sits at an elevation of 169 metres (554 ft) and has a maximum discharge of 10,450 cubic metres per second (369,000 cu ft/s) which correlates to a 1-in-10,000 year flood. The dam's outlet works consist of a single outlet on the right bank converted from one of the diversion tunnels.[3]
Reservoir
[edit]The reservoir that the main and saddle dams create will have a maximum capacity of 12,570 million cubic metres (10,190,000 acre⋅ft) of which 7,720 million cubic metres (6,260,000 acre⋅ft) is useful for power generation and irrigation. The reservoir's maximum operating level will be 185 metres (607 ft) ASL and the minimum 167 metres (548 ft) ASL. At the maximum level, the reservoir will have a surface area of 440 square kilometres (170 sq mi) while at the minimum it will be 288 square kilometres (111 sq mi). The reservoir's volume at minimum level is 6,600 million cubic metres (5,400,000 acre⋅ft). The average length of the reservoir will be 40 kilometres (25 mi) with an average depth of 29 metres (95 ft) and a maximum 88 metres (289 ft).[3]
Bui Hydropower Plant
[edit]Just downstream of the dam on the left bank is the dam's powerhouse. The intake at the reservoir feeds water through three penstocks to the three separate 133 MW Francis turbine-generators. Each turbine-generator has a step-up transformer to increase the voltage to transmission level. A fourth unit, with a penstock on the spillway, will provide four megawatts for station service and black start power, and will provide minimum flow to maintain river levels if the main units should be shut down. The power station will have an installed capacity of 400 megawatts and an estimated average annual generation of 980 gigawatt-hours (3,500 TJ). The power station's switchyard is located 300 metres (980 ft) downstream. Four 161 kV transmission lines connect the substation to the Ghana grid.[2][3]
Benefits
[edit]The Bui hydropower plant will increase the installed electricity generation capacity in Ghana by 22%, up from 1920 MW in 2008 to 2360 MW.[18] Together with three thermal power plants that are being developed at the same time, it will contribute to alleviate power shortages that are common in Ghana. Like any hydropower plants, the project avoids greenhouse gas emissions that would have occurred if thermal power plants had been built instead. An additional expected benefit is the irrigation of high-yield crops on 30,000 hectares of fertile land in an "Economic Free Zone".[19] The current status of the irrigation project is unclear.
Cost and financing
[edit]The total project costs are estimated to be US$622 million. It is being financed by the government of Ghana's own resources (US$60m) and two credits by the China Exim Bank: a concessional loan of US$270 million at 2% interest and a commercial loan of US$292 million. Both loans have a grace period of five years and an amortization period of 20 years. The proceeds of 30,000 tons per year of Ghanaian cocoa exports to China, which are placed in an escrow account at the Exim Bank, serve as collateral for the loan. Once the dam becomes operational, 85% of the proceeds of electricity sales from the hydropower plant will go to the escrow account. If not all the proceeds are needed to service the loan, the remainder reverts to the government of Ghana.[18]
Environmental and social impact
[edit]
An Environmental and Social Impact Assessment (ESIA) for the dam was completed in January 2007 by the US consulting firm Environmental Resources Management (ERM).[3] During its preparation hearings were held in Accra and in five localities near the project area, such as Bamboi. However, no hearings were conducted in the project area itself. Once completed, an independent panel appointed by the Environmental Protection Agency (EPA) of Ghana reviewed the ESIA. The latter was revised in the important aspects, including the following: "compensation" had to be provided for the inundated area of Bui National Park, a "rescue plan" for the hippos was required and it had to be specified how resettlement would be carried out. When the EPA issued the environmental permit for the dam, it required the Bui Power Authority to present within 18 months an Environmental Management Plan based on the revised ESIA. Construction and resettlement began in 2008, but no environmental management plan had been submitted as of July 2010.[20]
Environmental impact
[edit]The Bui National Park will be significantly affected by the Bui Dam. 21% of the park will be submerged. This will affect the only two populations of black hippopotamus in Ghana, whose population is estimated at between 250 and 350 in the park.[8] It is unclear if hippos can be relocated and if there is any suitable habitat near the area to be inundated. Even if there were such a "safe haven", it is not clear if the country's game and wildlife department has the means to rescue the animals.[21] The Environmental and Social Impact Assessment states that hippos will be vulnerable to hunting during the filling period of the reservoir. It also claims that they would ultimately "benefit from the increased area of littoral habitat provided by the reservoir".[3]
The dam could also have other serious environmental impacts, such as changing the flow regime of the river which could harm downstream habitats. A survey by the University of Aberdeen has revealed that the Black Volta River abounds with 46 species of fish from 17 families.[8] None of these species is endangered. Nevertheless, these fish communities could be severely impacted by changes to water temperature, turbidity and the blocking of their migration. Waterborne disease could also occur. Schistosomiasis in particular could become established in the reservoir, with severe health risks for local people.[3][21]
Social impact
[edit]The Bui dam project requires the forced relocation of 1,216 people, of which 217 have been resettled as of June 2010.[22] In order not to slow down the construction of the dam, the Bui Power Authority has opted for a quick resettlement process. It neglected the recommendations of a study, the "Resettlement Planning Framework", that it had contracted itself. In theory, all affected people are expected to be moved to a new locality called Bui City. However, as of 2010 the city does not exist and there is not even a schedule for its construction. Instead, the first 217 relocated people have been moved to a temporary settlement called Gyama Resettlement Township, which has dilapidated infrastructure. Fishers were resettled on dry land and lost their livelihoods. Although the study had recommended to establish an independent body to monitor the resettlement, no such body has been set up.[23]
See also
[edit]References
[edit]- ^ Bui Power Authority:Frequently Asked Questions Archived July 24, 2011, at the Wayback Machine, Retrieved on May 7, 2011
- ^ a b c d e f g h i Bui Power Authority:Bui Hydroelectric Project:Project Features Archived July 26, 2011, at the Wayback Machine, retrieved on May 7, 2011
- ^ a b c d e f g h i Environmental Resources Management (ERM):Environmental and Social Impact Assessment of the Bui Hydropower Project Archived 2012-03-08 at the Wayback Machine, Final Report, January 2007, retrieved on May 7, 2011, posted on the website of the Regional Dialogue on large hydraulic infrastructures in the Economic Community of West African States (ECOWAS)
- ^ "President Mahama inaugurates the Bui Hydro electricity project". Modern Ghana. 5 May 2013. Retrieved 4 February 2024.
- ^ a b "Ghana: Bui Dam Comes Alive - Ghana Energy Problems Now Over". All Africa. 20 December 2014. Retrieved 11 December 2014.
- ^ "Background of the Bui Resettlement". Bui Power Authority. 7 May 2011. Archived from the original on 24 July 2011. Retrieved 4 February 2024.
- ^ a b c Oliver Hensengerth:Interaction of Chinese Institutions with Host Governments in Dam Construction:The Bui dam in Ghana Archived October 4, 2011, at the Wayback Machine, German Development Institute, Discussion Paper 3/2011, p. 9-13, retrieved on May 7, 2011 (full version not available on-line)
- ^ a b c Bennett, D. and B. Basuglo.D. 1998. Final Report of the Aberdeen University Black Volta Expedition 1997. Viper Press, Aberdeen, Scotland. ISBN 978-0-9526632-3-2
- ^ Global 500 Forum:Adult Award Winner in 1998: Mike Anane Archived July 23, 2011, at the Wayback Machine, retrieved on May 9, 2011
- ^ Anane, Mike. "Courting Megadisaster: Bui Dam May Cause Havoc". United Nations Environment Programme. Archived from the original on 4 June 2011. Retrieved 7 May 2011.
- ^ Daniel Bennett, Aberdeen University Black Volta Project, letter to newspaper editor re. articles about Bui Dam, 8 November 1999, retrieved on May 9, 2011
- ^ Anane, Mike. "British Researcher Thrown Out of Ghana, May 8, 2001". International Rivers. Archived from the original on 11 September 2009. Retrieved 9 May 2011.
- ^ "Africa: Other Projects". International Rivers Network. Archived from the original on 2011-08-12. Retrieved 7 May 2011.
- ^ "Project Participants". Bui Power Authority. Archived from the original on 26 July 2011. Retrieved 7 May 2011.
- ^ Bui Power Authority:Project Milestones and Completion Schedule Archived July 26, 2011, at the Wayback Machine, Retrieved on May 7, 2011
- ^ http://www.modernghana.com/news/462096/1/president-mahama-inaugurates-the-bui-hydro-electri.html President Mahama Inaugurates the Bui Hydroelectricity Project retrieved 2013 June 5
- ^ Yakubu, Rahimat Oyiza; Ijeoma, Muzan Williams; Yusuf, Hammed; Abdulazeez, Abdulazeez Alhaji; Acheampong, Peter; Carbajales-Dale, Michael (2024-06-19), Performance Analysis of a 50 MW Solar PV Installation at BUI Power Authority: A Comparative Study Between Sunny and Overcast Days, doi:10.20944/preprints202406.1325.v1, retrieved 2024-06-21
- ^ a b Oliver Hensengerth:Interaction of Chinese Institutions with Host Governments in Dam Construction:The Bui dam in Ghana Archived October 4, 2011, at the Wayback Machine, German Development Institute, Discussion Paper 3/2011, p. 37f., retrieved on May 7, 2011 (full version not available on-line)
- ^ Bui Power Authority:Bui Hydroelectric Project:Bui Irrigation Project Archived March 23, 2012, at the Wayback Machine, retrieved on May 7, 2011
- ^ Oliver Hensengerth:Interaction of Chinese Institutions with Host Governments in Dam Construction:The Bui dam in Ghana, German Development Institute, Discussion Paper 3/2011, p. 22-24, retrieved on May 7, 2011 (full version not available on-line)
- ^ a b "Ghana: A dam at the cost of forests". World Rainforest Movement. January 2006. Archived from the original on 18 May 2011. Retrieved 7 May 2011.
- ^ Bui Power Authority:Background of the Bui Resettlement Archived July 24, 2011, at the Wayback Machine, retrieved on May 7, 2011
- ^ Oliver Hensengerth:Interaction of Chinese Institutions with Host Governments in Dam Construction:The Bui dam in Ghana Archived October 4, 2011, at the Wayback Machine, German Development Institute, Discussion Paper 3/2011, p. 27-33 and p. 43, retrieved on May 7, 2011 (full version not available on-line)
Bui Dam
View on GrokipediaThe Bui Dam is a concrete gravity hydroelectric dam situated on the Black Volta River in Ghana's Bono Region, featuring an installed capacity of 404 megawatts from four turbine units.[1][2] Constructed by China's Sinohydro Corporation under an engineering-procurement-construction contract, the project commenced in late 2008 and achieved full operation by December 2013, following decades of planning that originated in the early 20th century.[2][3] With a maximum structural height of 108 meters and a crest length of 492.5 meters, the dam creates a reservoir supporting annual electricity generation of approximately 1 billion kilowatt-hours while enabling irrigation for up to 30,000 hectares of land.[1][3][2] As Ghana's second-largest hydropower facility after the Akosombo Dam, it addresses chronic power shortages but has drawn scrutiny for ecological disruptions in the adjacent Bui National Park, including habitat fragmentation for species like hippopotamuses and the resettlement of over 1,000 local residents.[4][3] The initiative, financed largely through Chinese loans totaling around $622 million, exemplifies Beijing's resource-for-infrastructure diplomacy in Africa, influencing subsequent Sino-Ghanaian economic ties.[3][5]
Historical Development
Planning and Feasibility Studies
The planning phase for the Bui Dam involved multiple feasibility studies assessing technical, economic, and hydrological viability for a hydroelectric project on the Black Volta River in Ghana. Initial reconnaissance surveys occurred in the 1960s, followed by a comprehensive feasibility study in December 1976 conducted by the Snowy Mountains Engineering Corporation (SMEC) of Australia, which identified the Bui Gorge site as suitable for power generation with an estimated capacity of around 400 megawatts.[6][7] The project gained renewed momentum in 1992 when the French engineering firm Coyne et Bellier (now part of Tractebel Engineering) performed an updated feasibility study, confirming the site's geological stability and potential for reservoir formation despite seasonal flow variations in the Black Volta.[3] This was supplemented by another Coyne et Bellier study in 1995, which incorporated economic analyses projecting benefits for Ghana's national grid amid growing electricity demand.[6] By October 2006, the 1995 study was revised by Coyne et Bellier to address updated hydrological data and project economics, enabling progression to financing and construction preparations; this revision estimated construction costs at approximately $622 million and emphasized integration with existing hydropower infrastructure like the Akosombo Dam.[8] Parallel to technical assessments, the Ghanaian government commissioned an Environmental and Social Impact Assessment (ESIA) in the mid-2000s, allocating about $2 million for evaluations of biodiversity effects in the adjacent Bui National Park and resettlement needs for roughly 1,216 affected individuals, with findings submitted to the Environmental Protection Agency for review.[9][6] These studies collectively validated the project's feasibility but highlighted risks such as downstream flow alterations and habitat inundation spanning 21% of the national park.[10]Approval and Initial Opposition
The Bui Dam project, first conceptualized in the 1920s as part of broader Volta River development plans, saw renewed governmental interest in the late 1990s under the National Democratic Congress administration, with the vice president announcing intentions to construct it in mid-1999.[11] However, following a change in government in 2001, the project was initially shelved, as confirmed by Volta River Authority president Charles Wereko-Brobby, amid competing priorities and fiscal constraints.[12] Initial opposition emerged primarily from environmental advocates and international NGOs, who highlighted risks to the Bui National Park, including habitat disruption for endangered species such as hippopotamuses and potential increases in greenhouse gas emissions from reservoir-induced decomposition.[13] [14] A 2000 report by a government-commissioned panel, influenced by the World Commission on Dams' global critique of large hydropower, portrayed the project negatively, amplifying calls for alternatives like thermal power or smaller-scale renewables.[13] Local and international researchers faced restrictions, exemplified by the 2001 expulsion of a British academic studying ecological impacts, signaling governmental sensitivity to critiques that challenged the dam's viability.[11] Resettlement needs, though limited to 1,216 people compared to over 80,000 for prior Ghanaian dams, still raised social equity concerns among affected communities.[13] Opposition waned after 2006 when a loan from the Chinese government provided critical financing, bypassing earlier funding hurdles and enabling parliamentary approval of the Bui Power Authority's creation in 2007, separating it from the Volta River Authority to oversee the project.[12] [15] The Engineering, Procurement, and Construction contract was signed on April 19, 2007, between the Ghanaian Ministry of Energy and Sinohydro Corporation, followed by a groundbreaking ceremony on August 24, 2007, led by President John Agyekum Kufuor.[1] [16] This marked formal approval, with the Chinese Exim Bank's $293.5 million buyer's credit facilitating progress despite lingering environmental debates.[17]Construction Timeline
The construction of the Bui Dam commenced with a ceremonial groundbreaking on 24 August 2007, officiated by Ghanaian President John Agyekum Kufuor at the site on the Black Volta River.[18] Preparatory activities, including field investigations, began in October 2007, with initial construction works starting in January 2008.[19] The project was managed by the Bui Power Authority, with Sinohydro Corporation Limited of China serving as the primary contractor responsible for engineering, procurement, and construction.[3] Main dam construction, involving roller-compacted concrete for the 108-meter-high gravity structure, initiated in December 2009 following site clearance and resettlement efforts.[20] The overall timeline targeted completion by early 2012 to address Ghana's growing energy demands, but delays pushed this milestone.[21] By January 2013, the project reached 97% completion, encompassing the dam, powerhouse, and associated infrastructure such as spillways and saddle dams.[22] The first of three 133 MW turbine units was commissioned in May 2013, delivering initial power to the national grid and providing approximately one-third of the facility's 400 MW capacity.[23] The full hydropower plant became operational with the inauguration of the dam on 19 December 2013 by President John Dramani Mahama.[1] Although commercially operational from 2013, formal handover from Sinohydro to the Bui Power Authority occurred on 28 November 2016 after final testing and defect rectification.[17]Technical Specifications
Dam Design and Engineering
The Bui Dam features a roller-compacted concrete (RCC) gravity structure as its primary component, designed to withstand the hydraulic pressures of the Black Volta River while optimizing material efficiency.[3][8] The main dam reaches a maximum height of 108 meters above the foundation (90 meters above the riverbed) and has a crest length of 492 meters, with a total concrete volume of one million cubic meters.[3][1] Auxiliary saddle dams on the right bank supplement the main structure: one constructed with rock-fill and the other with earth-fill, both elevated to a crest height of 187 meters above sea level to fully impound the reservoir.[3] These elements ensure comprehensive containment of the 12.57 billion cubic meter reservoir at full supply level.[3] The spillway is integrated into the main dam body with five bays, each equipped with a 15-meter-wide radial gate, positioned at 169 meters elevation and engineered for a maximum discharge capacity of 10,450 cubic meters per second during extreme flood events.[3][1] Three intake structures are also embedded in the dam crest to channel water to the downstream powerhouse, incorporating features for sediment control and operational flexibility.[1] The RCC construction technique, executed by Sinohydro Corporation Limited as the turnkey contractor, facilitated layered placement and compaction of concrete, enhancing construction speed and seismic resilience in the region's geological context.[8][3] This design prioritizes gravitational stability over arch effects, relying on the dam's mass to resist water thrust.[1]Reservoir Formation and Hydrology
The Bui Reservoir was formed by impounding the Black Volta River following the closure of the dam's main structure, with the filling process commencing on June 8, 2011.[24] This marked a key milestone in the project, with water levels rising progressively over the subsequent years; by March 2013, the reservoir had accumulated sufficient volume to support initial hydropower operations, coinciding with the dam's commissioning in December of that year.[25] The impoundment submerged approximately 444 km² of land at full supply level (FSL), extending the reservoir's average length to about 40 km upstream.[3] At FSL of 183 meters above sea level, the reservoir attains a surface area of 444 km² and a total storage capacity of 12,600 million cubic meters, enabling regulation of seasonal flows from the Black Volta basin.[26] The minimum operating level is maintained to preserve ecological and operational functions, though specific thresholds vary with hydrological conditions and management protocols. Sedimentation from upstream inflows has begun accumulating in the reservoir, potentially affecting long-term storage efficiency, as observed in comparable impoundments on sediment-laden rivers.[27] Hydrologically, the reservoir intercepts annual inflows from the Black Volta catchment, which exhibit variability influenced by upstream land use changes and precipitation patterns, with modeled water yields increasing from 3.25 million cubic meters in 2000 to 4.75 million cubic meters in 2020.[28] Outflows are regulated primarily for hydropower generation, resulting in attenuated peak discharges during wet seasons and augmented base flows in dry periods, which alters downstream flow regimes and reduces the frequency of extreme events.[29] This management has implications for water availability, with remote sensing analyses confirming shifts in reversal frequencies, flow change rates, and minimum discharges post-impoundment.[28]Hydropower Infrastructure
The Bui Hydropower Station features an installed capacity of 404 MW, comprising three main Francis turbines each rated at 133.33 MW and one auxiliary 4 MW turbinette.[1] The Francis turbines, housed in the main powerhouse, are designed for high-head operation and fed by water from the reservoir via three intake structures and associated penstocks, enabling efficient conversion of hydraulic energy to electricity.[30][31] The turbinette, located in a separate mini powerhouse, utilizes minimum environmental flow releases to generate supplemental power, ensuring compliance with ecological requirements while contributing to overall output.[1] The powerhouse infrastructure supports peaking operations, with the station capable of rapid startup and load adjustments to stabilize Ghana's grid.[30] Electric generators synchronized with the turbines, supplied by GE Renewable Energy, deliver power at 161 kV through a 500 MVA switchyard equipped with five bays for interconnection.[31] A 241 km transmission line evacuates generated electricity to key substations at Sawla, Kintampo, Techiman, and Sunyani, facilitating integration into the national grid.[30] Annual energy production averages 969 GWh, with peaks reaching 1,547 GWh in high-inflow years like 2022, reflecting variability tied to seasonal Black Volta River flows.[30] The system's design emphasizes reliability, providing ancillary services such as frequency regulation amid Ghana's reliance on hydropower for baseload and peak demand.[30]Financing and International Partnerships
Project Costs and Funding Sources
The total cost of the Bui Dam project was initially estimated at US$622 million in the mid-2000s.[3] A cost review conducted in 2012 increased this figure by US$168 million, bringing the final project cost to US$790 million.[3][1] Funding was primarily secured through loans from the Export-Import Bank of China (China Exim Bank), with the Government of Ghana providing a smaller equity contribution. The financing structure included a concessional loan of approximately US$263.5 million at a low interest rate of 2% and a 20-year repayment term including a five-year grace period, alongside a buyer's credit facility of US$298.5 million tied to procurement from Chinese contractors.[32] The concessional loan was approved and disbursed starting in 2007, while the buyer's credit was formalized in September 2007 to support engineering, procurement, and construction by Sinohydro Corporation Limited.[33] Ghana's contribution amounted to US$60 million in public funds, covering about 10% of the initial estimated costs and allocated toward local components and contingencies.[3]| Funding Source | Amount (US$) | Type | Key Terms |
|---|---|---|---|
| China Exim Bank (Concessional Loan) | 263.5 million | Loan | 2% interest, 20-year term, 5-year grace period[32] |
| China Exim Bank (Buyer's Credit) | 298.5 million | Loan | Tied to Chinese procurement; disbursed 2007–2013[32][33] |
| Government of Ghana | 60 million | Equity | Public spending for project equity and overruns[3] |