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This article explores the trade-offs in the decarbonisation of the energy sector by analysing the legal arguments in favour of and against hydropower in EU law. It contends that the EU regimes in climate, energy and environmental law each value the advantages and disadvantages of energy production in different ways. In contrasting the approaches in these three areas of EU law, the article analyses how EU law governs the decarbonisation process in the context of hydropower. The analysis reveals a promising opportunity to reconcile the friction among climate, energy and environmental law while improving the ecological sustainability of hydropower production. [ABSTRACT FROM AUTHOR]

Climate change causes a problem for the energy system in Poland, which is based on the availability of water resources throughout the year. In situations of water scarcity resulting from increased demand or due to water deficits caused by the phenomenon of drought, it is necessary to develop efficient management methods that take into account the needs of all stakeholders and obtaining approval for new investments. The principles of Integrated Water Resources Management (IWRM) enable this efficiency to be achieved. The research used 51 questions in 3 surveys to assess the potential for IWRM implementation in 3 catchments located in an area of southern and south-western Poland with different topography, regional and socio-economic characteristics, i.e., the Białka (tourism domination), the Nysa Kłodzka (potential for hydropower) and the Widawa (lowland character). In order to interpret the results, the author's method of grouping survey questions from different sources was applied. The results of the study showed that there is considerable social potential and willingness to develop cooperation between different stakeholder groups but there are barriers related to the state of knowledge and its transfer between stakeholders. It is important not to ignore the stakeholders whose resistance can effectively delay investment processes. [ABSTRACT FROM AUTHOR]

The classification of a hydropower scheme as run-of-the-river (or run-of-river; ROR) evokes an image of a low-impact installation; however, examination of eight case studies worldwide shows that substantial negative societal and ecological impacts are tied to them, albeit in somewhat different ways. We conclude that ROR dams not only potentially displace communities, disrupt livelihoods, and degrade environments in surrounding areas, but they also divert water from areas of need, impact aquatic ecology through habitat destruction and disruption of fish migrations, emit non-trivial amounts of greenhouse gases over the lifespan of the project, and disrupt streamflow in downstream river sections. While these negative impacts vary on a case-by-case basis, medium and large ROR dams consistently have multiple and cumulative impacts, even when not having appreciable reservoirs. We contend that many impactful dams do not qualify as low-impact ROR projects, despite being defined as such. Such mislabeling is facilitated in part by the ambiguous definition of the term, which risks the ROR concept being used by proponents of impactful structures to downplay their negative effects and thus mislead the public or gain status, including within the Clean Development Mechanism in relation to mitigating climate change. [ABSTRACT FROM AUTHOR]

From less than three dozen in 1949, the number of small hydropower stations in the People's Republic of China grew to nearly ninety thousand by 1979. By the early 1980s, these stations were distributed across nearly 1,600 of China's 2,300 counties. In 770 counties, small hydropower was the primary source of rural electricity generation. This article offers a history and assessment of these developments, unsettling our traditional emphasis on large-scale hydroelectricity. The article begins by reconstructing the PRC's enormous investments in small hydropower from the 1950s to the early 1980s. This reconstruction, the first of its kind in the English language, not only helps reassess key periods and events in the history of the PRC but also establishes the position of small hydropower in the hydraulic history of the twentieth century. The article then turns to a discussion of the claimed impacts of small hydropower. As electricity became available for the first time in many parts of the Chinese countryside, it affected patterns of economic and social activity for hundreds of millions of people. Finally, the paper explores what the case of small hydropower can offer to conceptual and theoretical problems surrounding development, innovation, and the environment. Returning to the long-standing debate over scale and development, China's experience with small hydropower reminds us of the important role played by smaller-scale, appropriate, and self-reliant technologies in global energy history. [ABSTRACT FROM AUTHOR]

Fish biodiversity assessments are vital for understanding threats and aquatic ecosystem health. In the Poso River, Central Sulawesi, changes in biodiversity are influenced by habitat alteration, non-native species, and overfishing. This study evaluates fish and crustacean biodiversity in the Poso River system to address these challenges for improving fisheries management, conservation, and fish passage integration into hydropower development. The present biodiversity study utilized a comprehensive methodology that encompassed both traditional taxonomic approaches and DNA barcoding, specifically targeting the mitochondrial cytochrome c oxidase subunit-1 (COI) gene for accurate species identification and spatial boundary validation. The survey was conducted in the upstream, hydropower area and downstream areas of the river. We found 27 species of fish in the Poso River, including both native (e.g., Anguilla celebesensis, Oryzias nebulosus, Rhyacichthys aspro) and non-native species (e.g., Melanochromis auratus, Amphilophus trimaculatus, Oreochromis niloticus). Two International Union for Conservation of Nature (IUCN) red listed endangered species were also observed (e.g., Adrianichthys poptae and Mugilogobius sarasinorum). DNA barcoding was performed to examine species spatial boundaries. The fish population in the Poso River was dominated by non-native species, accounting for 85.70% of the total population. The upstream reaches had the highest fish abundance and diversity, while the downstream reaches had the lowest. There was, however, no significant difference in species richness and diversity across different locations and seasons. The dominance of non-native species in the Poso River necessitates the improvement of existing fishways within the hydropower dams potentially through the development of selective technology that can block the distribution of these non-native species. This research highlights the critical issue of non-native species proliferation and the potential threat they pose to native fish populations, providing valuable insights for conservation and management efforts in Indonesia and similar ecosystems worldwide. [ABSTRACT FROM AUTHOR]

Streamflow is significantly influenced by the increased temperature and rainfall inconsistency due to climate change. This study assesses the impacts of climate change on water availability and streamflow dynamics during the periods 2030–2069 and 2070–2099 for two greenhouse gas trajectories (SSP245 and SSP585) in the lower catchment of the Upper Sutlej River Basin (USRB). This study integrates data from the Coupled Model Inter-comparison Project Phase 6 (CMIP6) General Circulation Models (GCMs) with the SWAT hydrological model. This approach analyzes the complex interactions between climate variables and hydrological processes. NASA NEX-GDDP-CMIP6 Bias-corrected statistically downscaled data at 0.25° X 0.25° grid resolution are used. Under SSP245, projected streamflow for near future 2030 to 2069 shows increases up to 56.097% in December, while decreases reach -9.420% in August. For far future 2070 to 2099, increases are observed up to 41.846% in December, with decreases up to -25.670% in August. Under SSP585, for near future 2030 to 2069, decreases range from -7.616% in May to -13.614% in August. For far future 2070 to 2099, decreases range from -12.386% in October to -25.670% in August, while increases reach 46.211% in November. The insights derived are crucial information for assessing water resource vulnerability to climate change in mountainous regions. [ABSTRACT FROM AUTHOR]

Riverine habitat fragmentation by barriers, including impoundments, is common and their effects on obligate aquatic organisms are manifold. Organisms, such as Atlantic salmon (Salmo salar), that make extensive river migrations are particularly vulnerable to the effects of impoundments. In this study, we use acoustic telemetry to examine the migratory behaviour of Atlantic salmon, as they migrate to sea for the first time as juvenile 'smolts', in a river with a series of dams that form a complex hydropower scheme. We demonstrate that overall migration success in the River Dee catchment and particularly through standing waters was remarkably high. We speculate that high migration success in standing waters could be due to relative current speeds providing good quality directional cues to migrants. Migration success past the two dams in this study, was relatively high, although the number of unsuccessful passage attempts before a successful passage was also very high. The vast majority of smolts passed the dams when the turbines were operational. At one dam, smolts did not use an available fish pass but migrated through the generating turbines. These findings provide several routes through which generation could be managed to enhance the success of downstream smolt migration in rivers where there are similar patterns of hydrogeneration in place. [ABSTRACT FROM AUTHOR]

The current research aims to analyse the effect of the number and shape of the blades and the curvature of the flume bottom on the performance curves of undershot water wheels, based on experimental tests conducted in a fully instrumented laboratory facility. Six wheels are tested: four wheels with plane blades (16, 24, 36, 48) and two with 24 curved blades for two flume bottom configurations. Torque, mechanical power and mechanical efficiency performance curves are determined for several rotational speed and flow rate values. Results demonstrate that the maximum efficiency is achieved for the 36-plane blade wheel, the curved flume bottom reduces water losses under the wheel and increases efficiency, and the blades' shape strongly influences the wheel efficiency. Non-dimensional performance curves are provided to generalise the results. This research provides relevant contributions towards the development of a low-cost energy recovery solution to be applied in water infrastructures. [ABSTRACT FROM AUTHOR]

The relocation of the national capital from DKI Jakarta to the East Kalimantan region and its people migration requires energy escalation. This project will require an additional 1,555 MW of electricity from existing conditions. In line with Indonesia's clean energy transition, this need can be addressed by developing renewable energy infrastructure, particularly hydropower. This study evaluates the hydropower potential in the Mahakam River using a run-of-river scheme. Given the limited availability of hydro-climatological ground stations, satellite data such as CFSR-TRMM, SRTM DEM, DSMW, and land-cover data were utilized, supported by the SWAT rainfall-runoff model for hydrological analysis. Data calibration was applied, and discharge results were analyzed using a new diversion algorithm to estimate potential power output. Innovative resampling of headrace arrangements was introduced to mitigate potential hydropower conflict sites. Social factors, including protected areas and water transportation routes, were also incorporated to minimize land disputes. The study identified 25 mini-hydropower sites and 16 micro-hydropower sites with a total capacity of 105.4 MW and 9 MW, respectively. These small-scale hydropower systems could supply 3.4% of the projected electricity demand for the new capital city called Nusantara (IKN), and potentially reduce annual carbon emissions by approximately 480,000 tons. The use of satellite data requires meticulous attention to ensure that data acquisition and processing yield reliable results while accurately reflecting field conditions. This research position also provides an initial overview of energy transition strategies in the IKN area through hydropower development and the subsequent potential assessment. [ABSTRACT FROM AUTHOR]

Tibet, with its abundant hydraulic, solar, and wind resources, stands at the forefront of China's renewable energy development. This paper provides a comprehensive analysis of the current state of clean energy development in Tibet, highlighting the region's vast potential and the challenges it faces. We find that, while Tibet has made significant strides in harnessing its natural endowments, infrastructural limitations, seasonal fluctuations, and technological hurdles constrain the development of clean energy. This paper offers a multifaceted set of recommendations aimed at accelerating clean energy development in Tibet, including policy reforms, infrastructure enhancements, and technological innovations. Our study's unique contributions lie in its holistic approach to clean energy development, its detailed analysis of the regional energy policies, and its forward-looking recommendations that balance ecological protection with energy security. By adhering to the principle of ecological priority and conducting innovative research in clean energy development, Tibet can leverage its carbon sequestration capabilities for environmental protection while promoting sustainable economic and social development. This paper provides valuable insights for policymakers and scholars, offering a roadmap for the sustainable development of Tibet's economy and a reference for similar regions embarking on clean energy transitions. [ABSTRACT FROM AUTHOR]

The imperative of achieving net zero carbon emissions is driving the transition to renewable energy sources. However, this often leads to carbon tunnel vision by narrowly focusing on carbon metrics and overlooking broader sustainability impacts. To enable these broader impacts to be considered, we have developed a generic approach and a freely available assessment tool on GitHub that not only facilitate the high-level sustainability assessment of renewable energy projects but also indicate whether project-level decisions have positive, negative, or neutral impacts on each of the sustainable development goals (SDGs). This information highlights potential problem areas and which actions can be taken to increase the sustainability of renewable energy projects. The tool is designed to be accessible and user-friendly by developing it in MS Excel and by only requiring yes/no answers to approximately 60 diagnostic questions. The utility of the approach and tool are illustrated via three desktop case studies performed by the authors. The three illustrative case studies are located in Australia and include a large-scale solar farm, biogas production from wastewater plants, and an offshore wind farm. Results show that the case study projects impact the SDGs in different and unique ways and that different project–level decisions are most influential, highlighting the value of the proposed approach and tool to provide insight into specific projects and their sustainability implications, as well as which actions can be taken to increase project sustainability. [ABSTRACT FROM AUTHOR]

The El Niño-Southern Oscillation (ENSO) has diverse effects on the interannual variability of river flows in Colombia. Given that 70% of the country's electricity supply is provided by hydroelectric dams located in different regions and operated by different companies linked by a nationally integrated system, the decisions taken by operators in response to ENSO can be just as varied. The present study investigates the spatial and temporal distribution of the ENSO effects in four case studies, its relation to hydropower generation and prices, and assesses the reliability of global ENSO indices for monitoring and anticipating local effects. The results show ENSO-driven variations in streamflow and precipitation in all cases, but their intensity and duration are highly dependent on location. La Niña led to positive precipitation and stream flow anomalies, while El Niño led to negative anomalies. In two dams, Hidrosogamoso and Betania, the ENSO influence is stronger, and has a higher correlation with reservoir operations with lags greater than one month. Urra has more stationary annual operations given the reduced ENSO effects in the reservoir’s basin. On the whole, ENSO indices are insufficient in describing the local variations completely. And operator’s size, market share, and installed capacity contribute to increasing flexibility in operations while facing ENSO challenges. [ABSTRACT FROM AUTHOR]

Numerous sustainability studies often overlook the social dimension. This neglect arises from two main reasons: the scarcity of reliable social indicators and the qualitative nature of most of the available ones. This study offers a different perspective to address this gap by using data envelopment analysis (DEA), a method that can handle both quantitative and qualitative data. Unlike traditional DEA that aim to maximize output with minimal input, our approach aims to maximize positive perceptions of impacts (outputs) and the effectiveness of impact management strategies (inputs). We rely on data collected by our team, using Likert-scale surveys from 694 participants in two Colombian Andes river basins, representing the hydropower industry, policymakers, and local communities. DEA makes our analysis more objective, less influenced by biases of decision makers. Findings provide insights into the factors driving efficient sustainability perceptions and lay the groundwork for designing specific policies to improve sustainability while balancing social, economic, and environmental concerns, achieving a comprehensive approach to sustainability in Colombian hydropower. [ABSTRACT FROM AUTHOR]

This study investigates the feasibility of utilizing surplus hydropower from Ecuador's major hydroelectric plants to produce green hydrogen, a clean energy source that can be used to meet a large percentage of energy needs. Given Ecuador's significant hydropower infrastructure, this approach leverages untapped energy resources for hydrogen production, with potential impacts on decarbonization strategies. A Pareto analysis identified five key hydroelectric plants that contribute the most to the national surplus. Using historical data from 2019 to 2023, a stochastic model was applied to estimate future surplus availability through 2030. The findings indicate that although Ecuador's surplus hydropower peaked in 2021, the general trend shows a decline, suggesting an urgent need to capitalize on these resources efficiently. The results indicate a projected annual surplus of hydroelectric energy in Ecuador, ranging from 7475 to 3445 GWh over the next five years, which could be utilized for green hydrogen production. Ecuador thus has promising potential to become a green hydrogen producer, enhancing both regional energy security and carbon reduction goals. The reduction in energy availability for hydrogen production is attributed to the increasing energy demand and variable climatic conditions. [ABSTRACT FROM AUTHOR]

The integration of renewable energy sources into electrical power systems presents enormous challenges in technical terms, especially with energy storage. Battery electrochemical storage systems (BESSs) are becoming a crucial solution for reducing the intermittency of renewable energy supply and enhance the stability of power networks. Nonetheless, its extensive implementation confronts constraints, including expense, life expectancy, and energy efficiency. Simultaneously, these technologies present prospects for improved energy management, increase the hosting capacity of renewable energy, and diminish reliance on fossil fuels. This paper investigates the obstacles of integrating electrochemical storage into electrical power systems, explores solutions to use its promise for creating more resilient and sustainable grids, and presents a method for the size estimation and strategic allocation of electrochemical energy storage systems (EESSs). The aim is to improve grid voltage profiles, manage demand response, increase the adoption of renewable energy resources, enhance power transfer among various areas, and subsequently improve the stability of a power system during large disturbances. The methodology utilizes a multi-stage optimization process based on economic considerations supported by dynamic simulation. This methodology was tested employing a validated dynamic model of the Interconnected Electrical System of the Central American Countries (SIEPAC). The system experienced multiple significant blackouts in recent years, primarily due to the increasing amount of renewable energy generation without adequate inertial support and limited power transfer capabilities among countries. Based on the results of using the technique, EESSs can effectively lower the risk of instability caused by an imbalance between power generation and demand during extreme situations, as seen in past event reports. Based on economical constraints, it has been determined that the cost of installing EESSs for the SIEPAC, which amounts to 1200 MWh/200 MW, is 140.91 USD/MWh. [ABSTRACT FROM AUTHOR]

The rising demand for clean energy production due to climate change emphasizes the importance of optimizing water resources, particularly in countries with significant hydropower potential. Existing models for the Operational Planning of Hydropower Systems (HPSOP) typically focus on the natural flows of rivers, often overlooking the potential of water transfers between rivers and basins. To address this gap, this article employs an improved mathematical model of hydropower production, considering the adjustment of the water transfer in the operation schedule as an additional optimization variable. A customized meta-heuristic, named the Evolutionary Socio-Bio Inspired Technique (ESBIT), has been tailored to integrate water transfer mechanisms into the operational planning model. The proposed model was validated through a case study at the Henry Borden Complex in São Paulo, Brazil, using real power plant parameters and inflow data from the Brazilian system. The results obtained from the test case, both with and without water transfer, demonstrate that the proposed methodology effectively captures the operational characteristics of a system that allows water transfers between rivers or basins to optimize the available water resources and system costs. [ABSTRACT FROM AUTHOR]

Hydroelectric power is one of the most important renewable energy sources in the world. It currently generates more electricity than all other renewable technologies combined and, according to the International Energy Agency, it is expected to remain the world's largest source of renewable electricity generation into the 2030s. Thus, despite the increasing focus on more recent energy technologies, such as solar and wind power, it will continue to play a critical role in energy transition. The management of hydropower plants and future planning should be ensured through careful planning based on the suitable forecasting of the future of this energy source. Starting from these considerations, in this paper, we examine the evolution of hydropower with a forecasting analysis for a selected group of countries. We analyze the time-series data of hydropower generation from 1965 to 2023 and apply Innovation Diffusion Models, as well as other models such as Prophet and ARIMA, for comparison. The models are evaluated for different geographical regions, namely the North, South, and Central American countries, the European countries, and the Middle East with Asian countries, to determine their effectiveness in predicting trends in hydropower generation. The models' accuracy is assessed using Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), and Mean Absolute Percentage Error (MAPE). Through this analysis, we find that, on average, the GGM outperforms the Prophet and ARIMA models, and is more accurate than the Bass model. This study underscores the critical role of precise forecasting in energy planning and suggests further research to validate these results and explore other factors influencing the future of hydroelectric generation. [ABSTRACT FROM AUTHOR]

Copyright of LHB: Hydroscience Journal is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Regulatory audits have been judged as a vital instrument to ensure compliance with regulatory obligations. Similarity in understanding of the achievement of regulatory outcomes in both authorities and companies is a prerequisite to secure conformity to regulations. A divergent approach to audits suggests restricted effects of regulatory audits. We analysed nonconformity, documented in 153 audits of 113 Norwegian hydropower and aquaculture companies. Twenty companies were audited 2–12 times during 2012–2020. There were no indications that an audit resulted in improved awareness in the company. A major part of nonconformity is connected to financial interest, likely of significance to the company itself. In addition to the environmental consequences, the failure to uncover, correct, and prevent nonconformity is alarming, seen both from a risk governance and a financial perspective. Our study of water resource management and regulation shows that merely performing audits have no significant effect on improvement. We claim that it is futile to implement audits if they are not put into some systematic constructed programme theory in every single company. When stating nonconformity in regulatory audits, the rational way of following up by the authorities should focus on how the company and site managers in practice work with improving safety and quality. [ABSTRACT FROM AUTHOR]

Copyright of Österreichische Wasser- und Abfallwirtschaft is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Österreichische Wasser- und Abfallwirtschaft is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Recent studies in human geography and political ecology have examined the anticipatory politics of proposed infrastructure and their effects. Less work analyses how speculation and rumour are mobilised to promote or resist such infrastructures. In this paper, I examine how speculative ideas about long-proposed hydropower dams and transbasin water diversions in the Salween River Basin are strategically deployed by differently placed actors working towards project development or demise. I draw on empirical research on the proposed Yuam River water diversion project in Northwest Thailand and near the Thai–Myanmar border. I develop a conceptualisation of proposed infrastructures as amorphous as they constantly change form and enrol a shifting network of actors, and development plans and imaginaries. The Yuam diversion becomes amorphous through the contested 'facts' of the case and over time. I illustrate this using two longitudinal examples. First, infrastructure is made amorphous through protracted development processes for the Yuam diversion and earlier iterations. Second, I examine speculative ideas about how the Yuam diversion is intertwined with proposed dams in the Basin including the Hatgyi Dam in Myanmar. In this case, the lack of confirmed project developers and financiers for the Yuam diversion, and rumours of Chinese actors' involvement under the Belt and Road Initiative, creates strategic space for project promotion and resistance. What is at stake is not just theorising proposed infrastructures as speculative ideas but how the 'amorphous' qualities of infrastructure are deployed strategically, by whom, and to what effect. [ABSTRACT FROM AUTHOR]

This article examines how and by whom the future of glacial energy was imagined in Greenland between the 1950s and 1970s, with a specific emphasis on the intersection of discourses of energy and political autonomy. The focus lies on the years from 1953, marking the end of Greenland's colonial status and its integration into the realm of its former colonial authority, Denmark, until 1979, when the Greenland Home Rule Agreement was enacted. The futures of hydropower are explored through the lens of energy imaginaries, a notion that underscores the interconnectedness between different forms of energy and the organization of social structures. These imaginaries revolving around hydropower circulated in the public-political space in Greenland decades prior to when the first operational hydropower plant came online in 1993. Through a historical empirical analysis, this article identifies the energy imaginaries linked to envisioned hydropower and delineates key phases of their emergence. It also discusses these envisioned futures of hydropower in the historical context of Arctic oil exploration and Greenland's strivings toward political autonomy. The energy imaginaries of hydropower, especially glacial hydropower generated adjacent to Greenland's inland icesheet, built on a long-term timeline and autonomous society, in contrast to the oil development that was favoured by Danish authorities at the time. Ultimately, it was the considerations of the sources and scale of the necessary investments that deferred the implementation of hydropower until the late 1980s. However, the groundwork for viewing Greenland's water resources as a cornerstone for its future independence had been laid. [ABSTRACT FROM AUTHOR]

Renewable energy generation sector has grown rapidly over the past decade, driven by increasing investments, heightened political and public support, and advancements in technology. This review highlights recent technological developments in the sector and analyzes the state-of-the-art to uncover major overarching trends. The findings suggest that the main maturation directions for emerging renewable technologies are towards harnessing new untapped sources of renewables and combining energy generation with additional value creation for more versatile and effective land, infrastructure, or labor utilization. The overarching concept is clear: generating greater economic or environmental value with minimal investment. The key emerging technological trends were identified as the development of means for: distributed small-scale generation, large-scale land versatility, and accessing marine renewables. Notable examples of maturing technologies with significant deployment include agrivoltaics, floating photovoltaics, and floating wind, all of which are on track to becoming industrial standard practices. Looking ahead, the deployment of renewable energy technologies is expected to accelerate over the next decade, driven by rising demand, improved access to new energy resources, trends toward grid decentralization, expanding utility-scale energy storage solutions, and the economic benefits of co-located, multi-purpose installations.

Hydropower is the predominant renewable energy source globally and will play a key role in transitioning countries away from fossil fuels. Yet hydropower production is threatened by the effects of climate change, with significant implications for both energy security and the energy transition. In this policy brief, UC Berkeley PhD candidates Johnny Guy and Ishana Ratan, together with co-author Anthony Calacino, explore preliminary evidence from Brazil, Colombia, and Nepal that shows the multifaceted challenges hydropower-dependent nations face, and divergent responses governments have taken in response. They demonstrate why, in the face of increasing uncertainty, hydropower-dependent countries—already vulnerable to the impacts of seasonal disruptions to power supply—must develop robust strategies for load balancing and project risk management.

Intensifying extreme droughts are altering lentic ecosystems and disrupting services provisioning. Unfortunately, drought research often lacks a holistic and intersectoral consideration of drought impacts, which can limit relevance of the insights for adaptive management. This literature review evaluated the current state of lake and reservoir extreme drought research in relation to biodiversity and three ecosystem services. The study findings demonstrated that few articles linked or discussed drought implications with one or more ecosystem services, instead focusing primarily on biodiversity. Drought effects on biodiversity varied among species and taxonomic groups. In the limited literature that included ecosystem service provisioning, droughts had a general negative effect. Drinking water supply can decrease and become more costly. Decreasing water flow and volume can reduce hydropower generation. Degraded water quality can also impact recreation. Future intersectoral collaborations and research on intensifying droughts should support adaptive management efforts in mitigating drought impacts. [ABSTRACT FROM AUTHOR]

Hydroelectric power is one of the most important renewable energy sources in the world. It currently generates more electricity than all other renewable technologies combined and, according to the International Energy Agency, it is expected to remain the world’s largest source of renewable electricity generation into the 2030s. Thus, despite the increasing focus on more recent energy technologies, such as solar and wind power, it will continue to play a critical role in energy transition. The management of hydropower plants and future planning should be ensured through careful planning based on the suitable forecasting of the future of this energy source. Starting from these considerations, in this paper, we examine the evolution of hydropower with a forecasting analysis for a selected group of countries. We analyze the time-series data of hydropower generation from 1965 to 2023 and apply Innovation Diffusion Models, as well as other models such as Prophet and ARIMA, for comparison. The models are evaluated for different geographical regions, namely the North, South, and Central American countries, the European countries, and the Middle East with Asian countries, to determine their effectiveness in predicting trends in hydropower generation. The models’ accuracy is assessed using Mean Absolute Error (MAE), Root Mean Squared Error (RMSE), and Mean Absolute Percentage Error (MAPE). Through this analysis, we find that, on average, the GGM outperforms the Prophet and ARIMA models, and is more accurate than the Bass model. This study underscores the critical role of precise forecasting in energy planning and suggests further research to validate these results and explore other factors influencing the future of hydroelectric generation.

The 2280 km long Jinsha River has been blocked at least four times in the past 30 years. A landslide damming hazard chain can endanger communities and infrastructures hundreds of kilometers downstream from the damming site in alpine gorges. Past damming events have resulted in severe consequences, demanding a thorough assessment of damming threats along the entire Jinsha River. This study digitizes the Jinsha River and visualizes its topographic, tectonic, hydrologic, and climate characteristics in detail. A two-stage full-probability method is proposed for assessing the damming threats along this river, making it possible to identify potential damming hotspots and high-priority zones for hazard mitigation. It is found that the upper reach of the Jinsha River poses the greatest damming threat, and the threat level gradually decreases downstream. Approximately 33.4%, 36.7%, 20.5%, and 9.4% of the entire length of the Jinsha River are classified as low, moderate, high, and very high threat levels, respectively. Compared with existing hydropower projects, future projects in the upper reach are more likely to be exposed to landslide damming. We highlight the value of basin-scale spatial threat analysis and envisage that our findings will promote more targeted local-scale risk assessments for potential damming hotspots. These outcomes provide the basis for managing the risks of river damming and hydropower infrastructure along the Jinsha River.

Abstract The transboundary Arun River Basin (ARB) spreads across Nepal and Tibet. Nearly 95% of the basin lies in Tibet through which the Pumqu River flows, forming the Arun River once it enters Nepal. The ARB has five large hydropower projects undergoing construction or planned for the future. Rainfall and earthquake‐induced landslides, landslide‐dammed lakes and landslide‐induced glacial lake outburst floods pose major risks to smooth operation of these projects. To safeguard upcoming hydropower projects, areas susceptible to landslides in the ARB must be identified. We used high‐resolution satellite imagery and open‐source tools to generate a multitemporal landslide inventory for the basin. The rigorously quality‐controlled inventory represents a yearly record of landslides from 2011 to 2020. A data‐driven approach was used to map areas susceptible to landslides within the ARB. The multitemporal landslide inventory combined with other readily available Earth observation‐based variables was used to create a landslide susceptibility map. The susceptibility analysis provides a valuable initial estimate of where landslides are likely to initiate. These landslide products could form the basis of more comprehensive local studies to inform hydropower project development.

Small hydro technology is playing a crucial role in advancing sustainable, clean energy policies as part of the global hydro development strategy. Its contribution to social and economic development is becoming more prominent, particularly in ensuring electricity access for rural communities and supporting industrial expansion. The main causes of bulb turbine failures under high operating conditions are frequently attributed to variations in pressure in the draft tubes, which are aggravated when a spinning vortex rope is formed under load operation. Different fluid injection techniques, namely compressed air and water jet injection, address these issues and reduce the negative results of cavitation. The investigation covers the flow visualization on the suction side of a single hydrofoil utilizing a cavitation tunnel and a bulb turbine. This study assesses the effectiveness of compressed air injection in reducing vibration generated by cavitation in bulb turbines. Positive results of the experimental studies suggest a decrease in noise and vibration by air injection that prevents oscillations of the vortex rope. This research also considers how the hydrofoil design of bulb runner blades influences flow characteristics. Hence, it provides knowledge on cavitation structures in diverse cavitation numbers. Different studies that compare the original and modified hydrofoil designs reveal remarkable improvements that may be due to changes in the key parameters of the hydrofoil, such as later cavitation initiation and reduced intensity. To obtain the optimal output of a bulb turbine by considering air injection for vibration reduction and hydrofoil design changes to limit the negative effect of cavitation, the Reynolds number and cavitation number are to be defined. This multidisciplinary approach possesses enormous potential to increase the reliability and efficiency of bulb turbines in challenging operating conditions.

Operational water management is a critical global challenge, and decision making can be improved by using mathematical optimization. This paper provides an overview of optimization techniques, both exact and heuristic, used in water management. It focuses on the use of optimization techniques in the short term: operational planning in reservoir management, control of open channels, hydropower scheduling, and operation of polder drainage pumps. Principles of model predictive control, methods for optimization under forecast uncertainty, and approaches for conflict resolution are explained with the help of educational examples and practical cases. Challenges and research questions to be addressed in the future are presented as an outlook. This article is categorized under:Engineering Water > MethodsScience of Water > Water and Environmental ChangeWater and Life > Conservation, Management, and Awareness [ABSTRACT FROM AUTHOR]

Small hydro technology is playing a crucial role in advancing sustainable, clean energy policies as part of the global hydro development strategy. Its contribution to social and economic development is becoming more prominent, particularly in ensuring electricity access for rural communities and supporting industrial expansion. The main causes of bulb turbine failures under high operating conditions are frequently attributed to variations in pressure in the draft tubes, which are aggravated when a spinning vortex rope is formed under load operation. Different fluid injection techniques, namely compressed air and water jet injection, address these issues and reduce the negative results of cavitation. The investigation covers the flow visualization on the suction side of a single hydrofoil utilizing a cavitation tunnel and a bulb turbine. This study assesses the effectiveness of compressed air injection in reducing vibration generated by cavitation in bulb turbines. Positive results of the experimental studies suggest a decrease in noise and vibration by air injection that prevents oscillations of the vortex rope. This research also considers how the hydrofoil design of bulb runner blades influences flow characteristics. Hence, it provides knowledge on cavitation structures in diverse cavitation numbers. Different studies that compare the original and modified hydrofoil designs reveal remarkable improvements that may be due to changes in the key parameters of the hydrofoil, such as later cavitation initiation and reduced intensity. To obtain the optimal output of a bulb turbine by considering air injection for vibration reduction and hydrofoil design changes to limit the negative effect of cavitation, the Reynolds number and cavitation number are to be defined. This multidisciplinary approach possesses enormous potential to increase the reliability and efficiency of bulb turbines in challenging operating conditions. [ABSTRACT FROM AUTHOR]

Addressing the climate crisis requires renewable energy, however, developing renewable energy should be equitable. In this article, we analyze a 15-year-old transnational hydroelectric power development conflict involving Indigenous rights in Mapuche-Williche territory, Chile and a Norwegian state-owned company, Statkraft. We seek to advance the field of energy justice by evaluating injustices in this transnational conflict. At the heart of the conflict is a threatened Ngen Kintuantü (the spirit guardian Kintuantü), which is part of a ceremonial and pilgrimage site of utmost importance in Williche territory. We argue that epistemic justice – the radical inclusion of different ways of knowing – can be a central tenet to understanding and redressing the harms connected to energy development, especially via networks of solidarity with Indigenous rights claims. Yet currently, the right to consent for energy projects, – which is informed by the international legal mechanism Free, Prior, and Informed Consent and Chile's codification of a less stringent Indigenous consultation – is limited by its formation within liberal legality. Despite these limitations, the Traditional Organization of the Ayllarewe of Ngen Mapu Kintuantü, an organization of Mapuche-Williche communities, is crafting and demanding their own form of territorial consultation. Drawing from a solidarity network of research across the Global South and North, we find that existing tools like FPIC can and must be strengthened through Indigenous and local guidance, but that justice, in a broader sense, cannot be achieved without returning land and broader legal reforms. [ABSTRACT FROM AUTHOR]

The concept of just transition is often defined as a process of including particular kinds of fossil fuel workers in the transition towards low-carbon energy. Missing from such liberal framings of just transitions is an engagement with how the extraction of both fossil fuels and low-carbon energy is contingent upon state violence and the expropriation of Indigenous and frontline communities' lands. In contrast to liberal framings of just transition that focus on the inclusion of fossil fuel workers as stakeholders, this article calls for an investigation of 'violent transitions', which refers to the ways in which the expansion of fossil fuel and low-carbon energy infrastructures are predicated upon direct state-sanctioned violence – including the criminalization of dissent, protests, and mass mobilization through police violence and arrests – to facilitate processes of land expropriation. Drawing upon a comparative analysis of 121 coal and hydropower projects in India, the article argues that both coal and hydropower energy transitions are characterized by significant state-sanctioned violence. Such historical injustices must be redressed and repaired in India's emergent just transition policy frameworks. [ABSTRACT FROM AUTHOR]

This study analyzes the potential of cross-border electricity cooperation as an effective way to reduce the costs of renewable energy deployment in the South Asian region using a novel cooperation mechanism among countries. This paper studies the case of India, Bhutan, and Nepal. From the analysis, Bhutan and Nepal have a large under-exploited hydropower potential that presents a great opportunity for India's energy supply by developing cross-border electricity trading infrastructure and associated markets. For this, developing the infrastructure for power transmission and hydropower plants in each country is necessary to reduce investment in flexibility solutions, power system costs, and CO2 emissions. According to a previous analysis, in Nepal's case, the Cross-Border Electricity Market (CBEM) development would increase Nepal's Gross Domestic Product (GDP) by up to 39%. India would also benefit from this mechanism. Using this energy trade mechanism, India's power generation needs would be reduced by 2% and CO2 emissions would be reduced by 5.60% by 2045. The most important conclusions to highlight are that (i) there is an important opportunity to simultaneously enhance the economy sector in some undeveloped countries in the region when, at the same time, reducing carbon intensity in India; (ii) at the same time, there is a large barrier, as the analysis shows that despite these associated benefits there is a major risk in the lack of policy harmonization among all countries involved; and (iii) that one of the most important key aspects for success is the development of a coordinated regulation strategy. These results show the potential of CBEM systems in the region but also encourage researchers and policymakers worldwide to explore this mechanism as an effective way to enhance the decarbonization of power systems. [ABSTRACT FROM AUTHOR]

In light of challenges like climate change, pollution, and depletion of fossil fuel reserves, governments and businesses prioritize renewable energy sources such as solar, wind, and hydroelectric power. Renewable energy forecasting models play a crucial role for energy market operators and prosumers, aiding in planning, decision-making, optimization of energy sales, and evaluation of investments. This study aimed to develop machine learning models for hydropower forecasting in plants integrated into Water Distribution Systems, where energy is generated from water flow used for municipal water supply. The study involved developing and comparing monthly and two-week forecasting models, utilizing both one-step-ahead and two-step-ahead forecasting methodologies, along with different missing data imputation techniques. The tested algorithms—Seasonal Autoregressive Integrated Moving Average, Random Forest, Temporal Convolutional Network, and Neural Basis Expansion Analysis for Time Series—produced varying levels of performance. The Random Forest model proved to be the most effective for monthly forecasting, while the Temporal Convolutional Network delivered the best results for two-week forecasting. Across all scenarios, the seasonal–trend decomposition using the LOESS technique emerged as the most successful for missing data imputation. The accurate predictions obtained demonstrate the effectiveness of using these models for energy planning and decision-making. [ABSTRACT FROM AUTHOR]

Hydropower as a flexible regulation resource is a rare choice to suppress the ever-increasing penetration of wind power in electrical power systems. The complementary characteristics and performance improvement of a hydro–wind hybrid power system based on a mathematical model of the hybrid power system is studied in this paper. This established model takes into account the stochastic variation in wind speeds in the wind power subsystem and the hydraulic–mechanical–electrical coupling characteristics of the hydropower subsystem. The complementary analysis is conducted based on the evaluation variables outputted by the established model, such as the wind power, hydro-regulation power, hydraulic power, and frequency. To make full use of the regulation capability of the hydropower system, the optimization of parameter settings is also carried out to improve complementary performances of the hybrid power system. The results from the complementary analysis show the detailed characteristics of hydro–wind coordinated operation under different types of real wind speeds. Here, 95% of installed hydro-capacity is used to complement the power shortage of the intermittent wind energy under the low wind speed. Alternatively, only around 66% of the installed hydro-capacity can be utilized to cope with the fluctuation in wind power under the medium and high wind speeds before the optimization of parameter settings. The recommended values and change rules of the control, hydraulic, and electrical parameters for the hydropower system are subsequently revealed from the analysis of parameter settings to contribute to a stable and safe hybrid power system. The results show that the optimized parameter can increase the maximal regulating capacity of the hydropower system by nearly 9 MW, approximately a sixth of the total installed hydropower capacity. The method and results obtained in this paper provide theoretical and technical guidance for the safe and economical operation of power stations. [ABSTRACT FROM AUTHOR]

The artificial pulsed-flows impact associated with hydropower production on the downstream biological and physical processes has been extensively addressed, showing that it may cause fish drift while changing fish habitat selection toward lower water velocity patches, acting as refuge areas. We aimed to evaluate the attraction efficiency of two flow-refuges differing in their approaching angles, for Luciobarbus bocagei at an indoor experimental flume. We tested two flow-refuge insertion angles (45° and 70°), and two flow events (base 7 L/s and pulsed-flow 60 L/s) for each. To analyze flow-refuge efficiency, we quantified fish individual and group patterns, flow-refuge use, and permanence time, while measuring glucose and lactate responses. The results showed that the individual frequency of use during simulated pulsed-flow was higher, especially on the 45° flow-refuge. The simulated pulsed-flow condition did not disrupt group behavior for both approaching angles. Glucose and lactate analysis did not trigger physiological responses in the tested trials. The 45° flow-refuge was used more often than the 70°. The narrowing of the channel caused by the 45° flow-refuge, and the consequent higher flow homogeneity increased the attractiveness of the flow-refuge. Therefore, the flow-refuge insertion angle should be a decisive criterion in the construction and installation of flow-refuges for cyprinids, and be considered a potential indirect mitigation measure. [ABSTRACT FROM AUTHOR]

This paper presents research on the hydropower-displaced communities of the Middle Bhotekoshi and Arun-III projects in Nepal, focusing on the effects of different livelihood assets on their livelihood strategies. The study finds that certain assets, such as social and human capital, significantly affect livelihood strategy selection, while others, such as physical and financial capital, do not. Additionally, most households (66%) diversified their income away from agriculture. Although non-farm sources were the most viable strategy, the majority (67.77%) of people living below the international poverty line also used this strategy. The paper also explores the impact of the COVID-19 pandemic on hydropower-displaced people in Nepal, highlighting key challenges such as reduced household income, disrupted agricultural production, and inadequate access to medical care. Ultimately, the study underscores the need for targeted interventions to address the specific needs of hydropower-displaced people in Nepal, considering both their displacement and the ongoing pandemic. Plain Language Summary: This research fills the knowledge gap about the hydropower displacees situation in Nepal using sustainable livelihood framework. The findings reveal that a majority of households (66%) diversified their income sources beyond agriculture. Similarly, non-farm activities were the most viable strategy, but it was observed that a significant majority (67.77%) of people below the international poverty line also relied on this strategy. Additionally, it also draws attention to the additional hardships caused by the COVID-19 pandemic, underscoring the need for appropriate support measures to address the specific needs of these communities. Our findiings highligts the serious issues of dispalcement due to development projects and policy makers can use our findings improve the displacees conditions. [ABSTRACT FROM AUTHOR]

The urgent global challenges of climate change, energy security, and environmental degradation highlight the need for sustainable energy solutions. Renewable energy sources (RES) present a viable pathway towards sustainability by mitigating greenhouse gas emissions, reducing reliance on fossil fuels, and fostering economic resilience. Purpose: The purpose of this paper is to propose an advanced Multi-Criteria Decision-Making (MCDM) approach to evaluate various RES by integrating environmental, economic, technological, social acceptance, and resource availability criteria, to identify the most suitable RES for sustainable energy solutions. Methodology: The study employs a hybrid method combining Type-2 Neutrosophic Numbers (T2NN) with LOPCOW (Logarithmic Percentage Change Operator Weighting) and MAIRCA (Multi-Attributive Ideal-Real Comparative Assessment) to rank the suitability of different RES, including solar, wind, hydropower, and geothermal energy. Findings: The case study results reveal wind energy as the top-ranked alternative, supported by consistent findings across comparative methods such as COPRAS, MABAC, EDAS, and TOPSIS. Sensitivity analysis further confirms the stability of the proposed model under various scenarios. Originality: The originality of this study lies in the integration of T2NN, LOPCOW, and MAIRCA to address the limitations of traditional MCDM approaches in handling uncertainty and imprecision in data. The study demonstrates the efficacy of the proposed framework in providing a robust evaluation of RES, and its value lies in its potential to inform decision-making in the field of sustainable energy solutions. [ABSTRACT FROM AUTHOR]

Hydroelectric plants are of great importance for agricultural development by providing clean energy, supporting irrigation and contributing to the stability of the electrical grid, which directly benefits the productivity and sustainability of the agricultural sector. The present study was developed at the Small Hydroelectric Power Plant "Alzamiento de Jagüecito" in the Chambas Basin with the objective of developing a computer program for the design and evaluation of the Francis turbine. The methodology used consisted of a web system in the Python programming language from which the following parameters were calculated: power, rotation speed, specific speed, net jump height, absolute entry speed, tangential speed, impeller parameters and flow parameters. the metallic spiral chamber. The results showed that the INFO_FRANCIS computer program allows determining the power of the turbine, the electrical energy produced and the load factor from the behavior of the water levels in the reservoir. This program is useful to compare the results of the program with the data obtained from the Hydraulic Use Company and the Electrical Union of the province; in addition to helping to monitor the operation of the turbine, which prevents possible problems that may arise and suggests viable corrective measures that should be applied. [ABSTRACT FROM AUTHOR]

Atlantic salmon (Salmo salar), brown trout (Salmo trutta), and steelhead trout (Oncorhynchus mykiss) kelts have important conservation value for population resilience. Nonetheless, relative to other salmonid life-stages, knowledge on their behavior and survival is poor. This is especially true for kelt downstream migration in rivers fragmented by hydropower plants (HPP), even though the physiological and survival consequences are severe when functional connectivity is not provided. Here, the existing information about kelt downstream migration past HPP was summarized, beginning with an overview of iteroparous salmonid lifecycles. Then, the importance of kelts for conservation and the threats they encounter while migrating was discussed. Finally, the current corpus of peer-reviewed literature and reports focused on kelt migration in these systems was presented. Kelt studies have focused on five main themes: (1) postspawning survival, (2) migration delays before dam passage, (3) passage selection and guidance efficiency, (4) passage mortality, and (5) the swimming behaviors of kelts during migration. Overall, there was a paucity of information about kelts and several information gaps and needs for future research. This work should inform scientists and river managers on the conservation of salmonids in regulated rivers, including the development of passage solutions for safe downstream migration. [ABSTRACT FROM AUTHOR]