The Integrated Hydropower Sustainability Assessment in Tajikistan: A Case Study of Rogun Hydropower Plant

Tajikistan has formulated the strategy to rejuvenate the country through hydropower.(eRogun hydropower plant (HPP) is designed as the highest hydropower station, while its sustainability is also questioned due to a lack of comprehensive sustainability evaluation. Considering that the external environment of Rogun HPP is complex and changeable, its sustainable performance will be fragile and inconstant. To comprehensively assess the sustainable performance, an integrated evaluation framework, covering the current and dynamic sustainable performance, is urgently established.(erefore, this paper firstly explored the hydropower sustainability assessment indicators which can conform to Tajikistan’s situations and further examined the current sustainable performance of Rogun HPP. (e case study found that Rogun HPP’s current financial viability, involuntary resettlement, the measures to prevent corruption, and information disclosure were seriously deficient. (e SWOTanalysis indicated the external factors, such as the Belt and Road Initiative, improving business environment, and easing geopolitical disputes, can eliminate weaknesses and improve the sustainable performance of Rogun HPP. At the same time, tight fiscal allocations and economic downturns will have negative influences on the sustainable performance.(e integrated evaluation tool established in this paper can not only evaluate the current sustainable performance but also consider the impact of external factors on sustainable performance from a dynamic perspective. (is paper contributes to the current knowledge system by establishing the hydropower sustainability assessment system which is suitable for Tajikistan’s conditions. Moreover, the results are informative for the decision-makers to have a better understanding of Rogun HPP’s current strengths and weaknesses, valuable opportunities, and potential threats.


Introduction
Hydropower remains the world's largest renewable energy source [1][2][3]. About 85% of global renewable electricity is generated in hydropower facilities [4]. Hydropower is widely considered to have mature technology, extraordinary durability and reliability, higher efficiency, obvious cost advantages, and lower maintenance costs than other forms of electricity generation [5,6]. At the same time, economists believe that hydropower dams can create jobs and boost economic growth. e urgent demand for clean energy, cheap electricity, and potential profits has directly contributed to the prosperity of hydropower in developing countries. Tajikistan has also formulated an ambitious plan for rejuvenating the country with hydropower and plans to achieve energy independence by 2030. e construction of new HPPs and the modernization of existing power stations are Tajikistan's strategic priorities. e benefits of hydropower, such as considerable power generation efficiency and high multiplier effects, are significant, but they are often accompanied by irreversible environmental and social damage [4,7]. Dam construction, especially for large dams, focuses on energy supply and economic development, while social and environmental damage is often overlooked or underestimated [8,9]. During the development process, the hydropower project exposed historical and cultural damage, reduced biodiversity, and ecological imbalances [10,11]. Besides, hydropower development is also accompanied by displacement [5,12,13], more susceptible to corruption [14], and unfair distribution of benefits [15,16]. Dams can also have a negative economic impact. e aging of the dam brings a decline in operating efficiency and increased safety risks, so the dam owner has to bear expensive maintenance costs [17]. Because the cost of repairing a small dam is three times the cost of demolition, some dam owners and managers choose to demolish the dam instead of performing expensive repairs or upgrades [18]. By 2019, Europe has demolished 3,500 dams [19]. e clean, low-carbon hydropower sources may have unsustainable effects. Improper planning of hydropower projects will have devastating consequences for society and the environment [20][21][22]. Sustainable development depends not only on how the potential change is selected but also how they are implemented [17]. With increasing awareness of environmental protection and human rights, people are reexamining hydropower and its role in national development. In 2000, the World Commission on Dams (WCD) issued a landmark report calling on hydropower development to focus on sustainability. Since then, the "low impact hydropower" certification, "green hydropower," and "hydropower sustainable development specification" certification have been proposed by the United States, Switzerland, and the International Hydropower Association (IHA), respectively. Hydropower development has evolved from simply meeting the requirements for acceptable hydropower to recognizing the core principles of sustainable development and striving to reduce or even eliminate negative economic, environmental, and social impacts [23].
At present, the efficient, equitable, and sustainable management of water resource is vital for Tajikistan. Tajikistan has invested in large-scale hydropower projects to fill the huge electricity gap. Tajikistan has abundant water resources with more than 900 rivers, 1300 lakes, and many mountain glaciers [24]. According to statistics, 60% of water resources in Central Asian countries are formed in the territory of Tajikistan, which can be used sustainably [25,26]. Tajikistan has invested in large-scale hydropower projects. Among these, the Rogun HPP is the most representative project, which is expected to generate an average of 17 billion kilowatt hours of electricity annually. When Rogun is built, Tajikistan will be the largest supplier of relatively cheap and environmentally friendly electricity, which will contribute to the growth of the economy and regional influence. However, the external tension in Central Asia on water resource disputes and the internal backward economy have made it difficult for sustainability development. e Rogun project is postponed due to some issues, which have undesirable impacts on the economy of Tajikistan. Meanwhile, the sustainability of the Rogun project has raised doubts among experts and scholars. Hence, it is necessary to explore the sustainability of Rogun HPP, which will have a better understanding of Rogun HPP and promote the sustainable development of hydropower.
It should be mentioned that the sustainable performance will change due to fluctuating external conditions. e existing sustainable evaluation often only focuses on sustainable performance at a certain moment, which leads to a static and one-side result. It is necessary to build an evaluation model that integrates current performance with potential future changes. Sustainability evaluation that combines static and dynamic perspectives can provide more informative reports and reveal more comprehensive advantages and challenges. Besides, the hydropower sustainability assessment focusing on Tajikistan is a research gap. e existing international hydropower sustainability assessment tool, such as the Hydropower Sustainability Guidelines and Hydropower Sustainability Assessment Protocol (HSAP), Low Impact Hydropower Certification scheme, and the Green Hydropower Certification scheme, cannot be directly employed to assess the sustainable performance of hydropower in Tajikistan. Firstly, due to the different social, cultural, and political conditions in different countries and regions, conducting assessments in an international context is particularly challenging. To increase the applicability, the abovementioned hydropower sustainable evaluation standards are mostly guiding and principled. However, hydropower projects are almost always site-specific in terms of scale, management, cost, and benefits, which indicates that it is difficult to assess the social and environmental impact of a hydropower project with a unified evaluation system [4]. Secondly, the existing standards do not fully reflect the prominent issues that Tajikistan may face in the sustainable development of hydropower, such as transboundary water governance, financing, and corruption. e sustainable assessment tool for hydropower projects that fits the national conditions is a prerequisite for accurate results of evaluation. erefore, the Tajikistanspecific evaluation criteria should be established to check hydropower sustainability. e objective of this paper is to explore the sustainability performance of Rogun HPP using an integrated method from the perspective of dynamic development. is paper first provides the basic situation of Tajikistan's power supply and sustainable development and then establishes a checklist of sustainable hydropower assessment that is suitable for Tajikistan's national conditions. Based on this, a systematic review of Rogun HPP covering economic, environmental, and social aspects and risk management will be conducted. Finally, based on the SWOT, this article discusses potential opportunities and threats for the sustainable development of Rogun HPP from the dynamic perspective. As a result, this research will provide insight into the current sustainable performance of the Rogun HPP and potential change in the future.

Hydropower Ambitions and Sustainable
Development in Tajikistan 2.1. Underutilized Water Resources. As the heart of water reserves in Central Asia, Tajikistan is rich in lakes and reservoirs and its water surface is approximately 1005 km 2 of which the top 22 lakes in Tajikistan cover an area of about 625 km 2 . According to statistics, 60% of water resources in Central Asian countries are formed in the territory of Tajikistan, which can be used sustainably [25,26]. However, the lack of reservoirs and hydropower plants in Tajikistan leads to underutilization of renewable energy resources and a series of problems such as electricity shortage in winter [27], which greatly increase the difficulties in the development of the economy. In terms of potential hydropower reserves, Tajikistan ranks 8th in the world behind China, Russia, the United States, Brazil, Zaire, India, and Canada. Specifically, it ranks 1st and 2nd around the world in terms of hydropower generation capacity per square kilometer (36,699,000 kWh/km 2 /year) and per capita (65,900 kWh/person/year). Besides, it is expected that Tajikistan's hydropower potential can provide sufficient energy security for Central Asia, at 527 billion (kWh/year) equivalent to three times the current electricity consumption in Central Asia [28]. erefore, the effective development of hydropower in Tajikistan not only plays an important role in the domestic energy security but also affects the economic development and energy distribution of Central Asia.
However, hydropower in Tajikistan is not fully utilized. In 2018, its total installed capacity of HPPs was only 29th in the world with 5795 MW, and its power generation capacity was only 30th in the world with 17.7 TWh. Although Tajikistan continues to build large hydropower projects such as the Rogun HPP and ranks 6th in the world with the newly installed hydropower capacity of 605 MW, as shown in Figure 1, such installed capacity and power generation scale are still far from sufficient for Tajikistan and Central Asia [29].

Electricity Shortages.
Tajikistan's energy supply mainly comes from hydropower, coal, and oil. Although hydropower generation has not increased significantly since the 1990s, its consumption is much greater than any other type of energy consumption, remaining as high as at 60% after 2000 and reaching a maximum of 75.8% in 2010, as shown in Figure 2 [30].
Today, over 95-99% of Tajikistan's electricity generation is based on hydropower, while only 5% of this hydropower potential of about 4,412.7 MW has been being used. e total installed capacity of Tajikistan's hydropower in 2018 was 5,795 MW. Fortunately, the installed capacity of the newly built Logon HPP in 2019 reaches 3,600 MW, which may greatly increase the hydropower capacity of Tajikistan and Central Asia [29].
Nevertheless, Tajikistan's power production is still insufficient to meet domestic demand throughout the year.
ere are two reasons for this issue. On the one hand, the power equipment currently used in Tajikistan is a product leftover from the Soviet era. e equipment is severely aging, with poor performance and safety levels so that the loss rate in Tajikistan's power grid is as high as about 15%. For example, Nurek HPP, which accounts for about 70% of Tajikistan's total annual energy demand, has an installed capacity of more than 3,000 MW and has an operating efficiency of only 77% since its commissioning in 1972 [31]. On the other hand, seasonal differences in Tajikistan's power system are so significant that 70% of its residents suffer from severe power shortages during the winter despite Tajikistan can export a large amount of electricity to other Central Asian countries. is is because that the average river flow in Tajikistan during the severe winter period (December to March of the following year) is only 25% of the annual average flow, with its power shortage in autumn and winter accounting 3 to 3.5 billion kWh [32].
In the past decade, Tajikistan has a population growth of 53.4% to 9.53 million people, and a GDP growth of 46% to 7.523 billion, as one of the fastest-growing countries in the CIS. e rapid increase in population and economic scale may force Tajikistan to develop infrastructure, ensure energy security, and respond to public needs.

Hydropower Strategy.
For Tajikistan, energy security after the collapse of the Soviet Union is a serious issue that needs to be solved urgently. In particular, unbalanced energy production capacity may restrict the improvement of people's living standards and industrial development. erefore, how to obtain sustainable energy support, especially hydropower, can be an important national policy, which may promote domestic industries, expand the rural nonagricultural sectors, and accelerate sustainable development in Tajikistan.
Within the Sustainable Energy for All framework, Tajikistan released an assessment report, pointing out that by 2030, 5.6 million people living in rural areas of Tajikistan should be guaranteed access to regular and reliable electricity in the energy supply aspect, and in terms of energy efficiency, reducing energy losses up to 10% in power grids [33].
To achieve the above goals and realize energy independence, Tajikistan has invested in large-scale hydropower projects and power transmission network projects. Currently, 12 public energy projects with a total investment of 16.1 billion TJS (about $1.6 billion) are under implementation. e  most representative is Rogun HPP and Central Asia-South Asia Electricity Transmission and Trade Project (CASA-1000). is is based on the consideration of increasing electricity generation and electricity import and export, respectively, so that Tajikistan may avoid the crisis of energy shortage even in the winter.
e Rogun HPP is expected to generate an average of 17 billion kWh annually, which will increase Tajikistan's electricity generation by at least 50%. Meanwhile, CASA-1000 may facilitate the exporting of surplus power energy from Kyrgyzstan and Tajikistan to Pakistan through Afghanistan by building up a power transmission line [34]. Hence, it is necessary to study the development of these projects and explore its sustainability. is will gain insight into project sustainability and promote the development of Tajikistan.

Sustainable Hydropower.
ousands of dams are being demolished in developed countries. In contrast, developing countries that are plagued by power shortages are speeding up dam construction [8]. Large hydropower infrastructure has the characteristics of a long construction period, large capital requirements, and wide-ranging scope. erefore, once the project is not properly planned, it may have a significant negative effect on the economy, society, and ecology.
To reduce adverse effects, hydropower development must adhere to the principle of sustainable development [35]. e definition of sustainability based on the triple bottom line principle is widely adopted in studies related to sustainable development [36]. Sustainable hydropower has enormous potential to contribute to global sustainability goals. e objective to make energy systems sustainable has become a crucial policy-making priority. Inevitably, the government of Tajikistan faces the same challenges. Tajikistan, as a part of the international community, is also striving to achieve the goal of "a decade of sustainable energy for all" announced by the United Nations General Assembly in 2014-2024. e core goal of energy sustainable development is to ensure the supply of secure, sustainable, and affordable electricity [36]. Besides, with the public's concern about safety and environment, the environmental and social impacts of the project have become crucial factors affecting the success of the project [37].
Tajikistan faces many serious problems to achieve sustainable development of hydropower. e first is that the main rivers in Tajikistan are transboundary rivers and are upstream countries, which means that Tajikistan will affect downstream water-consuming countries when hydropower is generated. Also, no viable benefit distribution mechanism has been formed among Central Asian countries. is is an urgent issue for the sustainable development of Tajikistan's hydropower projects. e former Uzbekistan president was against the construction of Rogun HPP and argued this project will change the runoff pattern of the Amu Darya river, resulting in water shortage for irrigation in summer [38]. e opposition is not only due to the environmental issue, but also for political and economic considerations. Last but not least, it is also difficult for the government of Tajikistan to fully self-fund the cost of large-scale hydropower infrastructure.
e World Bank also expressed concerns about Tajikistan's financing methods [39].

Conceptual Framework of the Integrated Hydropower Sustainability Assessment.
e Checklist is a simple and practical evaluation tool [40]. Each hydropower project can choose appropriate indicators based on the project's unique natural resource issues and stakeholder priorities. It should be noted that the HPPs' sustainable evaluation, which is based on a checklist or MCDA, often only considers the impacts of the internal factors on sustainability. However, external factors are ignored. Due to the characteristics of a long construction period and capitalintensive nature, the sustainability performance of HPPs is easily affected by external factors such as macroeconomics and policies. In addition, the sustainability assessment that takes into account internal and external factors conduces comprehensively understand the current sustainable performance and possible changes in the future. e sustainable evaluation of HPPs should not only evaluate the current sustainable performance, but also consider the possible impact of external factors on the sustainable performance. Considering that SWOT analysis can integrate the internal or external factors of a project or enterprise, SWOT analysis was employed to comprehensively evaluate the sustainability of the project. In summary, the conceptual framework of this article is to build an integrated sustainable hydropower assessment model based on checklist and SWOT analysis. e specific steps are shown in Figure 3. Firstly, to form, a structured checklist and evaluation criteria were set according to the project situation. en, the current sustainable performance was evaluated by the checklist. e results of the current sustainability performance analysis are the basis for identifying the strengths and weaknesses of the project. en, external opportunities and threats were identified. Finally, a SWOT analysis of the sustainable development of the project was formed.

Selection of Indicators.
To fully understand the sustainable performance, Tajikistan needs to carry out sustainability assessments for hydropower projects. e sustainable assessment tool for hydropower projects that fits the national conditions is a prerequisite for a comprehensive and accurate evaluation of hydropower projects. Based on the general sustainable hydropower assessment, this study combined with Tajikistan's political, economic, and legal conditions to establish a sustainable assessment standard for hydropower projects in Tajikistan. ese indicators can be divided into four aspects: economic, environmental, social, and risk management. 4 Advances in Civil Engineering

Environmental Aspect
(1) Environmental Management Plan (EN1). Hydropower projects shall establish the environmental management system and implement relevant policies to meet legal requirements and other standards or policy requirements.
(2) Environment Impact Assessment (EN2). Environmental impact assessment (EIA) is essential for hydropower. In Tajikistan, the environmental impact assessment consists of two parts: (i) OVOS and (ii) state ecological expertise (SEE). e translation of OVOS into English appears as environmental impact assessment or EIA. In essence, OVOS is the material preparation stage, and SEE assumes a similar role as an environmental impact assessment. According to the domestic laws of Tajikistan, the new facilities and types of activities, which may have environmental impact, shall be made subject to OVOS and to mandatory SEE. is means that environmental impact assessments of hydropower projects must be carried out in Tajikistan. Also, the comprehensiveness and transparency of the content also should be included.
(3) Biodiversity (EN3). Poorly designed dams can cause irreversible damage to the environment [41]. To achieve environmental sustainability, plan should be made to reduce negative impacts on biodiversity and ecosystem.

(4) Pollution Prevention Measures (EN4).
Hydropower projects should adopt pollution prevention and control measures to protect public health during construction and operation. Such as monitoring and controlling waste, noise, dust, air quality, water quality, and hazardous substances.

(5) Soil Erosion and Sedimentation (EN5).
Tajikistan's hydropower stations are concentrated in the Vakhsh river basin which is characterized by high silt and sediment load. e average turbidity of the Vakhsh river exceeds 4000 g/m 2 . Sediment in the reservoir not only raises the water level, but also erodes turbine components and shortens the life of the power plant [42]. Tajikistan's largest Nurek hydropower, located in the Vakhsh river basin, is facing the challenge of high-load sedimentation. Once a large amount of sediment is deposited, it is difficult to clean up, so hydropower projects need to take measures to address soil erosion and sedimentation.

(6) Environmental Basic Flow Assessment (EN6).
HPPs may disrupt the water cycle and cause downstream ecological degradation. International good practice shows that if the discharge volume and discharge period under sluices are arranged rationally, HPPs can maintain the basic ecological water demand of rivers and lakes and even bring positive effects to the downstream during the dry season. Considering that domestic agriculture and downstream agriculture are highly dependent on water resources, hydropower stations in Tajikistan must examine ecological flow and discharge flow.

Economic Aspect
(1) Project Economic Evaluation (EC1). Project economic analysis is indispensable in economic sustainability assessment. Net present value and sensitivity analysis are the key indicators.
(2) Financial Viability (EC2). e economic risks of the project, especially the rationality of fundraising, cannot be ignored in the sustainable assessment. e large dam projects rely on huge funds, so that the company's balance sheet and even the government's balance of payments account may be affected [11]. International Rivers [

Advances in Civil Engineering
indicates that many hydropower projects are located in areas with high environmental and social risks because of the low environmental protection requirements, poor human rights protection, and corruption issues in their countries. Jadoon et al. [44] further point out if these countries are suffering from an energy shortage and financial crises, the sustainability performance of HPPs becomes even more serious, as financial pressures have led these countries to adopt cheaper but highly unsustainable solutions. Large dam infrastructure has also proved to be an economic burden for the government [45]. Since the collapse of the Soviet Union, the economic crisis and civil war have seriously damaged the country's national economy. Tajikistan's GDP in 2018 was $8.152 billion, ranking 146 out of 196 economies and last among the five Central Asian countries [46]. It can be seen that Tajikistan's economic development is not only relatively backward in the world, but also in the five Central Asian countries. erefore, the economic sustainability assessment of hydropower projects in Tajikistan should also focus on whether to pay all plans and commitments. Tajikistan is also committed to complying with World Bank policies on involuntary immigration [48].

Social Aspect
(2) Social Impact Assessment (SO2). Both the World Bank and the Asian Development Bank regard the social assessment as a critical condition for loan approval. e social evaluation report analyzes the possible risks of the project through in-depth systematic investigation and research, proposing countermeasures to eliminate adverse effects, which has the important effect on improving the sustainability. e social evaluation of hydropower projects involves natural resources, project acceptability, social risk, compensation, and stakeholder participation.
(3) Communication and Negotiation (SO3). Large hydropower infrastructure needs to establish the communication and coordination mechanism, which facilitates stakeholders to express their demands and questions. At the same time, the project can also solve the disputes with stakeholders through this mechanism.
(4) Benefit Sharing (SO4). In some cases, hydropower projects have become a means for elites to grab resources and profits. However, communities affected by the project lose land even without sufficient compensation [22,49,50].

Risk Management
e risks of corruption need to be considered in hydropower sustainability assessments. e huge investments in dam infrastructure projects increase the risk of corruption [51]. According to international good practice, corruption risk assessment is the most cost-effective corruption prevention measure. It can identify potential corruption risks in advance and develop preventive measures. Corruption risk assessments are primarily concerned with whether policies are in place to mitigate corruption and whether the procurement process is fair and transparent.
(2) Transboundary River Governance (RI2). e crossborder rivers have sparked many political conflicts. In the Central Asian region, the management of transboundary water resources is related to regional stability and economic development. To obviate the fear of negative downstream impacts, Tajikistan must set up practical and feasible cross-border water resources management around the three core aspects, namely, fair distribution of water quantity, a guarantee of water quality, and ecological balance. Specifically, firstly, Tajikistan should strictly abide a series of water agreements among the five Central Asian countries. Secondly, Tajikistan needs to establish transparent monitoring system and maintain information exchange with other countries. Finally, it is import for the project to assess the cross-border impact and risk on the scale of the river basin (3) Information Sharing (RI3). e project shall report risks to the affected communities on time, especially when environmental pollution accidents or other emergencies occur. Emergency measures must be taken promptly and properly. e residents who may be harmed by pollution shall be notified on time, and report to the local environmental protection administrative department shall be delivered immediately.
As shown in Table 1, 15 indicators with corresponding content were extracted from the literature review and finally formed a structural checklist for conducting hydropower sustainability assessment. ese indicators were divided into economic, environmental, social, and risk management. e scope of the indicator is defined by the content, which helps assessors understand the tasks.

RI3
Information sharing (i) Does the project regularly report to the community the most important risks and opportunities? [58] Advances in Civil Engineering 7

Case Background.
e Rogun HPP is located in the central part of the Vakhsh river, with comprehensive benefits of irrigation, power generation, and flood control of largescale water conservancy, as shown in Figure 4. e multiyear average flow rate is 645 m 3 /s, and the design flow rate is 5,750 m 3 /s. e total reservoir capacity is 13 billion m 3 . e six 600,000 kW mixed-flow hydropower generating units will be installed, with a total installed capacity of 3.6 million kW and an annual generating capacity of 13.1 billion kWh. A total investment of the US $2,198.7 billion will be required for the completion and operation of the Rogun HPP.
Tajikistan conducted the first feasibility study and design for the construction of the Rogun project from 1965 to 1978. Construction preparations began in 1976, and construction of the main body of the project began in 1982. It was interrupted several times by the collapse of the Soviet Union, a blocked diversion tunnel, a Russian control dispute, and a lack of funds. On July 1, 2016, Tajikistan and Italian company Salini Impregilo agreed to cooperate for $3.9 billion to continue the construction of the dam. e first unit of the HPP was connected to the grid in November 2018. e second hydropower unit completed and put into production in September 2019. All units are expected to be fully operational by 2024. e main parameters of the phased development scheme of Rogun HPP are listed in Table 2.
e Rogun HPP can not only expand the power production, but also regulate the river flow, cut the peak, and fill the valley so as to guarantee the agricultural water and power supply in winter. When completed, the Rogun HPP will surpass the Nurek hydropower station to become the largest hydropower station in Central Asia. e Rogun HPP could completely fill the power gap in Tajikistan and be able to export power to other countries, which will greatly foster the economic development of Tajikistan. Because of the huge potential of the Rogun HPP, the elites strengthen the political propaganda and the sense of national identity and patriotism through the Rogun HPP. After the civil war of 1997-2001, President Emomali Rahmon began to instill new national consciousness in Tajikistan. e Rogun HPP has become an important symbol of progress, patriotism, and success. e project is also directly related to energy competition between Tajikistan and Uzbekistan. Uzbekistan has severely criticized the project and expressed concern about the reduction of downstream agricultural irrigation water. Eshchanov et al. [45] argue that the ambitious Rogun HPP will increase the budget deficit and shake the macroeconomic stability.

Sustainable Performance Assessment of Rogun Hydropower.
A panel of 10 eminent hydropower experts in the design, construction, and operation was set up. According to the evaluation indexes listed above, they assessed the sustainable performance of Rogun HPP from four categories: economy, environment, society, and risk management. e purpose of this assessment was not to provide an overall score to judge whether the sustainability is acceptable, but to provide a systematic sustainability analysis report. However, to facilitate the discovery of advantages and disadvantages, each assessment theme will still be scored based on the implementation of the project to visually indicate the performance of each item. e scale of scoring is relative to Tajikistan's legal and policy requirements or basic good practice, not an acceptable level. When Tajikistan does not have a clear definition of the subject of an assessment, basic good practice will be referenced. Scores for each assessment topic range from 1 to 5. Level 3 and Level 5 provide an important and clear scale for dividing the other scores. Level 3 describes basic good practices on a sustainability assessment topic. e specific meaning of basic good practice is consistent with the Hydropower Sustainability Assessment Protocol, namely, all projects should be working toward such practice, even in regions with the minimal resources or capacity. Level 5 describes best practices that have been proven in most national contexts for a sustainability problem. However, these best practices are not easily achieved.
e specific scoring criteria are as follows: (1) ere are several significant gaps from basic good practices (2) Most of the relevant elements are in place, but there is one significant difference from basic good practice (3) Basic good practices that fully comply with the requirements of Tajikistan's legal and policy requirements or basic good practices (4) Reach a level of basic good practice, but with one significant difference from best practice (5) Proven best practices with no obvious need for improvement e original score of the 10 experts are shown in Table 3.
Next, the consistency of the data is checked. e individual ICC index was 0.711, and the average ICC was 0.961. e overall consistency of the data is verified. erefore, the average score of the 10 experts is considered as the sustainability score of each indicator. e project's performances and a score of each indicator are presented in Table 4. At the same time, Figure 5 intuitively shows the sustainable performance of each indicator.
(ii) e projected budget of $2.5 billion by May 2019 is exhausted. A total of 6 hydropower units need to be started, and one of them is successfully started [60,61].

3.0
Financial viability (EC2) (i) e project has not been able to pay its promised payments on time. e Rogun HPP arrears over 5 months [62]. (ii) In 2018 and 2019, 18.3% and 17% of government public expenditure were used to support the construction of the Rogun HPP, respectively. In the third quarter of 2018, the financial allocation of the Rogun HPP pushed the fiscal deficit to 4.9% of GDP (World Bank Group, 2018). (iii) In 2010, authorities raised $185 million through an extensive publicity campaign to sell shares to the public, companies, and institutions. Forced share sales occur when more than 60% of the population lives below the official poverty line. (iv) In 2010, the Rogun HPP was declared "the exclusive property of the state." e last request for financial assistance from the Tajikistan authorities to the World Bank for the construction of HPP was rejected.
(v) Masud Sobirov, a Tajikistan economist, also agrees that the government does not have the financial resources to complete the construction. " e first and second batch of projects may start, but without attracting foreign investment and investors, the continued construction of projects will continue for many years, which will be a heavy burden for the national budget," Sobirov said [ Soil erosion and sedimentation (EN5) (i) Aiming at the problems of soil erosion and sediment deposition, the project adopted a series of protective measures in the diversion stage, including partial salt replacement. In addition, grouting curtain and water injection well are arranged to maintain the balance of return water volume, hydrogeology, and water chemistry ratio. After the completion of the project, the agency will also implement a wide range of grouting curtain [60].

4.2
Environmental flows assessment (EN6) (i) e total catchment area of the Vakhsh basin is about 39,000 km 2 . About 30% of the catchment area is above 4,000 m above sea level and covered with snow and glaciers. Due to its mountainous landform, the river has a high sediment content. e annual runoff of the river at the dam site is about 20 km 3 , which is equivalent to the long-term average flow of 635 m 3 /s. Runoff is expected to remain largely intact and unaffected by global climate change until at least 2050 [60].

3.6
Social aspect 1.76 (ii) e Nurobod residents in flooded areas were forced to leave their homes. e inhabitants of these mountain villages will reside in the Danghara, Tursunzoda, and Faizobod valleys. e resettlement process is scheduled to be completed by 2040. In the meantime, 42,000 people from 40 villages will be moved elsewhere. e state has provided 200 million TJS (about $19.4 million) for the resettlement of the villagers. (iii) e principle of "compensation before relocation" was not observed. e living standards of those affected have declined significantly [63].
1 Social impact assessment (SO2) (i) Before the construction of the first and second phases of the project, social impact assessment has been conducted and released to the public.
(ii) e social impact assessment of the project conforms to factual information and seeks advice from local stakeholders and regulatory authorities. However, there are some differences between the social influence performance and the research.

2.5
Communication and negotiation (SO3) (i) e project did not hold a meeting involving the local public, and the opinions of the local residents could not be well reflected by the stakeholders and the local government. (ii) A certain level of communication and consultation has been established with the local community. In the first and second phases of the project, the contractor established a dispute appeal mechanism, but it did not play a good role [39].

1.8
Benefit sharing (SO4) (i) e Rogun HPP mainly meets the domestic power demand and exports surplus power. Apart from meeting electricity demand and reducing electricity price, no benefit sharing is involved. is also affects the score of social impact assessment (SO2). Before the construction of phase I and phase II projects, the social impact assessment has been completed and released to the public, but there is a big gap between the actual performance of involuntary resettlement and the assessment. Regarding communication and consultation (SO3), the website of the project and mainstream media are positive reports and political propaganda, while response to public doubts was lacking. e project team of Rogun HPP should draw lessons from other excellent resettlement practices. For example, the Bui hydropower project takes various measures to properly deal with the resettlement of migrants and the subsequent production and life. To expand agricultural production, improve the dam's catchment area, and improve food security across the country, the Bui project team envisions building a fishing port and launching an irrigation development plan of 30,000 hectares. e Chinese government, as a participant in the project, has agreed to buy 30,000 ton of Ghanaian cocoa from the day the dam began operating.
is would create a huge market for cocoa production, which in turn would increase foreign exchange earnings and improve the livelihoods of cocoa farmers. At the same time, the project will benefit the society and promote the local economy by improving social infrastructure, such as roads, schools, and hospitals. e average scores of economy and risk management were 2.05 and 1.79, respectively. e economic evaluation (EC1) provided a detailed evaluation of the economic benefits. After the second stage, the IRR of the project reaches 16%. But the financial viability (EC2) of the project is not sustainable. e salary arrears directly reflect the financial crisis of the project. Tajikistan was refused financial assistance from the World Bank, which directly increases the huge economic burden. e reasons for World Bank's rejection of Tajikistan's request for financial assistance were complicated, mainly because of water disputes between central Asian countries at the time and the energy dispute between the United States and Russia in central Asia. Moreover, the World Bank was not optimistic about Tajikistan's economic situation. It is important for Tajikistan to seek other funds to guarantee the construction of Rogun HPP. Risk management is another area that needs to be improved. Regarding the impact of Rogun HPP on downstream agriculture, Jalilov et al. [55] pointed out that the Rogun HPP will make agriculture in downstream countries  receive a certain loss, such as Uzbekistan. In the future, the shortage of water resources will cause Uzbekistan's annual economic loss of more than $ 609 million, while the GDP will drop by 2.2%. e World Bank analyzes the downstream impact of Rogun HPP from a more comprehensive perspective. It states although the Rogun HPP may reduce the downstream water supply in the summer, it can guarantee the downstream water supply during the dry season [39]. Anyway, the dam should be accompanied by more open communication and cooperation with downstream countries to create a win-win situation. Corruption is particularly serious. e use of inferior materials, the opacity of capital expenditure, and the huge corruption all lead to the collapse of engineering quality. Because of the water disputes, Tajikistan and its downstream countries are in a prisoner's dilemma. Although River Management has assessed cross-border impacts and risks, upstream and downstream countries cannot exchange information. Information sharing (RI3) also urgently needs to be strengthened. e project expenditure report and project fault report were not published.

SWOT Analysis.
e current sustainable performance has been evaluated by the checklist.
en the impact of external factors on the sustainability of the project was carried out through SWOTanalysis, by which one can form a prediction of the future sustainability of the project.

Strengths.
According to the results of the above project's sustainability performance, it can be concluded that the advantages of the project's sustainable development are comprehensive environmental assessment and environmental management plan, good environmental risk identification, and effective control measures.
Good environmental sustainability scores are due to the comprehensive and detailed environmental impact report of Rogun HPP. e environmental impact report of the Rogun HPP includes waste management, land management: soil conservation, erosion control, hazard management, and biodiversity, list of potential adverse environmental and social issues, Impact Assessment on Riparian countries of Rogun HPP, and hydrology and climate change impacts. Moreover, these reports are easily available online. To address the problems of soil erosion and silting, a series of appropriate protective measures were taken to maintain the hydrogeological balance.
e Central Asian Bureau for Analytical Reporting (CABAR) report states that most employees at Rogun HPP and its affiliates are facing unpaid salaries for five months [62]. e funding method of the Rogun HPP must be more diversified and robust. OJSC (Open Joint-Stock Company) Rogun HPP needs to strive to attract external investment, such as concessional loans, multilateral and commercial loans, and bonds. e authorities need to accelerate public financial reforms, improve the banking sector, and create a good investment environment to attract external investment and thereby achieve sustainable economy.
(2) Irregular Resettlement. e communities affected by the project have not received adequate compensation, and education, health care, and living standards have suffered a huge negative impact. In late May 2009, Tajikistan authorities relocated the first group of 232 families from three villages expected to flood the Rogun dam. More than 1,000 people from the rocky Nurabod district of the Rasht valley were transferred to the cotton-growing district of Danghara in southern Tajikistan. Resettled people have neither the opportunity to stay in their homeland nor the option to relocate.
(3) Blank Anticorruption Measures. At present, no effective anticorruption measures have been taken. President Rahmon stated in parliament's speech that "Compared to 2016, corruption among representatives of local authorities this year has increased by 25 percent" [64]. In the context of the high risk of corruption that Tajikistan is facing, the Rogun HPP with a total cost of about $3.9 billion must crackdown on corruption.
e project needs to strengthen financial transparency and strictly enforce public procurement laws. e financial reports need to be published to ensure the proper use of funds. To address the insufficient procurement process, the authorities also need to implement the electronic government procurement system as soon as possible to ensure fairness and transparency.
(4) Opaque Information System. e Rogun HPP also lacks the necessary information disclosure. Except for the World Bank report and the press release of Rogun HPP, no environmental and social risk warnings are announced on the website. e project company shall promptly report the environmental and social risks caused by the project to the community.

Opportunities
(1) e Belt and Road Initiative. In recent years, the Belt and Road Initiative has injected strong momentum into other developing countries in Asia. For example, e Chinese and Pakistani governments signed the "China-Pakistan Economic Corridor Energy Project Cooperation" agreement, dedicated to jointly tackle the shortage of power supply in Pakistan. Pakistan once faced a severe power shortage situation like Tajikistan, with a national power gap of 4500-5000 MW in 2012. e power gap has caused Pakistan's average annual GDP loss to reach $ 13.5 billion. However, due to prolonged war, political instability, and lagging economic development, it is difficult for Pakistan to independently invest in large power projects. After the launch of the China-Pakistan Economic Corridor, China actively built a consultation platform among the Advances in Civil Engineering 13 government, financial institutions, and enterprises to enable the project to obtain sufficient funds. As of April 2019, energy projects under the framework of the China-Pakistan Economic Corridor have added 3,340 MW of electricity to Pakistan, accounting for 11% of Pakistan's total installed electricity capacity, which has greatly alleviated Pakistan's power shortage [65]. e Belt and Road Initiative is an opportunity for Tajikistan. China is actively assisting countries along the Belt and Road to address energy problems through financial assistance, technical assistance, and geopolitics. Firstly, the Chinese government is increasing loans to foreign governments [66].
e Export-Import Bank of China is becoming a major funding provider for large dams around the world. Tajikistan can make full use of the Belt and Road investment to ease the financial burden. Besides, China can provide new solutions to Tajikistan's sustainable hydropower development in water conservation, thermal power generation, and clean energy power generation. Chinese hydropower companies, such as China Water Conservancy and Hydropower Construction Corporation and China Power Construction Corporation Overseas Investment Co., Ltd., are rapidly growing into a leader in hydropower construction. It is estimated that the market share of China Power Construction Corporation Overseas Investment Co., Ltd., accounts for 50%. Last but not least, the "community of common destiny for all mankind" can eliminate the barriers that restrict in the Central Asian region so that the five Central Asian countries can deepen cooperation with a more inclusive attitude. With China's increasing influence in Central Asia, China could provide constructive solutions for the Central Asia's water disputes.
(2) e Improving Business Environment. Tajikistan is improving the business environment through bank reform and informatization to attract foreign investment. Tajikistan was selected as one of the world's top ten business environment reformers in the Business Environment Report 2020 and has made significant progress in the fields of obtaining credit, developing new businesses, and promoting the export of commodities.
( 3) e Detente with Uzbekistan. Emomali Rahmon emphasized that expanding cooperation with Central Asian countries is one of Tajikistan's foreign policy priorities. After Shavkat Mirziyaev is selected as President of the Republic of Uzbekistan, a positive trend towards the development of multilateral regional cooperation emerged. In 2018, Tajikistan and the Republic of Uzbekistan handled most of the sensitive issues during the past two decades. e strategic partnership has formed.

reats
(1) Tightened Fiscal Appropriations. e Ministry of Energy and Water Resources of the Republic of Tajikistan established OJSC Rogun HPP with an authorized capital of 116 million TJS (about $11.3 million) for the construction of Rogun HPP. OJSC Rogun HPP and Italian general HPP construction contractor Salini Impregilo SpA estimated the total cost of the project to be $3.9 billion (approximately 40.2 billion TJS). Nearly 28 billion TJS (about $2.7 billion) has been invested in the construction of Rogun HPP. e government's financial allocation is the main source of funds. In 2018 and 2019, 18.3% and 17% of government public expenditure were used to support the Rogun HPP, respectively. In the third quarter of 2018, the financial allocation of the Rogun HPP pushed the fiscal deficit to 4.9% of GDP [67]. In Tajikistan, the high proportion of public investment in the energy sector has led to cuts and delays of public expenditure in other sectors. Furthermore, the government of Tajikistan supports capital intensive energy projects, such as Rogun HPP, at the cost of the massive deficit, which increases the debt risk. According to the report from the World Bank [68], it is roughly estimated that the Rogun HPP still needs at least 19 billion TJS (about $1.8 billion) to be put into operation. is means that Tajikistan will continue to face financial pressure from the Rogun HPP investments and growing debt service obligations. To alleviate the government's financial pressure and guarantee the construction of the Rogun HPP, the authorities of Tajikistan have tried other access to multichannel financing. In 2010, the authorities raised $ 185 million through a wide publicity sale of shares to Tajikistan's public, companies, and institutions. Since more than 60% of the population was living below the official poverty line at the time, the sale of shares was not entirely voluntary.
e World Bank advises authorities not to continue to force the sale of shares. In 2017 and 2018, the authorities raised $500 million (about 5.1 billion TJS) for the Rogun HPP by selling government bonds on the European market. Nevertheless, government funding is still the major source of funding for the construction of the Rogun HPP in terms of financing scale. e World Bank Group [67] pointed out that Tajikistan's debt scale is at a relatively high level in the context of increasing public debt and further pressure to support the construction of Rogun HPP. To avoid the country's debt crisis, Tajikistan's budget law in 2019 stipulates fiscal consolidation, and the national budget deficit is reduced to 3% of GDP. Besides, limited government deficits to the energy sector are also controlled. e government plans to increase budget allocations to the social sector (education, health, and social protection) and reduce expenditure in the energy sector, which may affect the financial viability of the Rogun HPP.
(2) Economic Downturn. During 2016-2019, although Tajikistan's GDP maintained a strong growth at 7%, the World Bank predicts that Tajikistan's GDP will enter a turning point in 2020 because of Russia's economic downturn and the decline of international commodity prices. Tajikistan's GDP growth is expected to slow to about 5.5-5.0% in 2020-2021 [69]. A downward economy is usually accompanied by a decline in revenue.
(3) Resource Nationalism. Resource nationalism refers to a policy in which the state is increasingly strengthening its resource sovereignty, controlling its resource flow, and strengthening its resource value. e fundamental purpose is to strengthen the leading position of the government in the resource sector and increase the country's share in the distribution of resource benefits. In a public speech, President Rahmon said that he did not want to raise funds for the construction of Rogun HPP by selling shares on the international market because, in this case, the Rogun HPP will be influenced by foreign countries, which will contradict the interests of the people. is speech hoped to accelerate the fundraising process by stimulating domestic resource nationalism. Resource nationalism has made some Tajik elites exclude foreign companies from participating in the development and use of their own energy.
(4) e Game between Powers. Besides, the Game between Powers has also affected the deep cooperation between China and Tajikistan. Since the independence of Central Asian countries, Central Asia has become the new venue for the game between the United States, Russia, and China. After the war in Afghanistan, American influence has declined, while China and Russia's influence has continued to rise. e foreign policy of the five Central Asian countries has gradually formed a pattern that economic development relies on China, while security protection mainly relies on the Russian-led Commonwealth of Independent States (CIS) collective security treaty organization. As the economic and trade relations between China and Tajikistan continue to deepen, Tajikistan's economic dependence on China has increased. Tajikistan and Russia maintain high levels of security cooperation, but economic cooperation has not made significant progress. With the fear of losing part of its political and economic sovereignty, Tajikistan has a waitand-see attitude towards joining the Eurasian Economic Union dominated by Russia. e economic crisis in Russia and China's One Belt One Road objectively weakened the expectations of Central Asian countries for Russian economic cooperation. But Tajikistan is still hesitating between the two.
(5) High Corruption Rate. e corruption rate in Tajikistan is high. e President of Tajikistan mentioned that "corruption by local government representatives has increased by 25% this year (2017) compared with 2016" [64]. e high rate of corruption in Tajikistan is an important reason for the lack of anticorruption measures in the Rogun HPP and the lack of transparency in financial information.

Discussion
It is expected that construction and filling of the Rogun HPP will take more than 15 years. e construction cycle is so long that the sustainable performance of the project is bound to change over time. erefore, it is necessary to integrate static and dynamic perspectives for sustainable evaluation. From the static perspective, the environmental sustainability of Rogun HPP is superior to economic sustainability and social sustainability. e Rogun HPP needs to improve its sustainability in financial viability, compensation and resettlement, corruption, and information disclosure. From the dynamic perspective, although preliminary environmental and social management plans have been developed for the project, they still need to be constantly updated to make them more specific for implementation. Moreover, current water allocation mechanisms and practices appear to be feasible and satisfactory to all parties in the current situation. In the long term, current allocations may not be sustainable as central Asian countries increasing demand for water. In the future, central Asian countries should reach consensus on water sharing as soon as possible and sign clear, understandable, transparent, monitored, and enforceable water agreements. e Rogun HPP is not a simple small hydropower project. Identifying external opportunities and challenges can help the project management team to analyze the dynamic change trend of sustainable performance and improve the sustainability of Rogun HPP with the help of external resources. Based on the above analysis, the strengths, weaknesses, opportunities, and threats for the sustainable development of the Rogun HPP are listed in Table 5. It can be seen from Table 5 that good performance in the environmental aspect has not been threatened or enhanced by external factors. At the same time, the weaknesses are faced with both opportunities and threats: Weaknesses and opportunities (WO): the Belt and Road initiative, improved business environment, and easing relations between Tajikistan and Uzbekistan are opportunities for sustainable development of Rogun HPP. Firstly, the Belt and Road initiative can provide the most urgent financial assistance for the project. Secondly, gradually improving business environment is conducive to attracting foreign investment. Finally, easing relations between Tajikistan and Uzbekistan will play a positive effect on the transboundary water resource information monitoring and sharing.
Weaknesses and threats (WT): the threats to sustainable development include tight fiscal allocation, expected GDP decline, resource nationalism, and the Game Between Powers. e tight financial allocation and expected GDP decline will aggravate the financial risk of the project. If the source of funds is not guaranteed, it will be more difficult to ensure that the involuntary resettlement will get adequate compensation. Attracting foreign investment is the most effective way to solve the current financial issues. But resource nationalism and the Game between Powers are obstacles to attracting foreign investment e Rogun HPP should have a clear understanding of the current sustainable performance and the possible positive or negative impact of external factors on hydropower sustainability. en Rogun HPP needs to take full advantage of the external opportunities to eliminate the current weaknesses and take measures to avoid the negative impact of external threats on sustainable development.
Advances in Civil Engineering 15

Conclusions
e purpose of this study was to explore the current sustainable performance of the Rogun HPP and the potential change in sustainability in the future. By conducting a comprehensive literature review, a checklist of 15 indicators that conform to the situation in Tajikistan was identified. Compared with the implementation performance of Rogun HPP and good practice, it is found that the project is facing financial issue, irregular resettlement, blank anticorruption measures, and opaque information system currently. When considering the impact of external factors on the sustainability in the integrated framework, it should be noted that external threats such as tight fiscal allocations and economic downturns could further reduce sustainability. At the same time, Tajikistan can seize opportunities such as the Belt and Road initiative and improve business environment to attract foreign investment, thereby solving the urgent financial issues. Besides, Tajikistan can take advantage of detente with Uzbekistan to enhance information sharing and benefit sharing, thus easing water disputes. is paper proposed an integrated model to assess the sustainability of hydropower projects, namely, considering both the static performance and the future changes.
Although the objectives of this study were achieved, some limitations were still present. First, the sustainability assessment in the model was based on a literature review. e field investigation cannot be carried out due to geographical restrictions. erefore, the gap between some policy expectations and actual performance may not be discovered and indicated. To increase the accuracy and reliability of the evaluation results, an expert group was established. ey scored the sustainable performance of the project based on the basic material of the Rogun HPP and their own rich experience. Also, the index listed in the evaluation model considered in this article may not cover all aspects, such as local political stability which they may beyond the control of project managers. Lastly, the purpose of this paper is to present the sustainable performance of each indicator, so the weight is not calculated. In the future, more exploration can be made in the weight of indicators. Nonetheless, the results of this research are still valuable for decisionmakers to have a more comprehensive understanding of hydropower projects and make full use of external resources to strengthen sustainability and reduce the negative environmental, social, and economic impacts. Furthermore, the checklist could be moved to other hydropower projects.

Data Availability
e data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest
e authors declare that there are no conflicts of interest regarding the publication of this paper.  16 Advances in Civil Engineering