Research Publications

PEN@Hydropower empowers its members to engage in research through its well-established research networks, opportunities for scientific exchange, and collaborative networking activities. This section showcases the scientific achievements and contributions of PEN@Hydropower’s members.

2023

  • This concept paper aims to provide insight into the possibilities of determining hydropower potential of an ungauged watershed in Montenegro, through the development of a hydrological model of a larger watershed, under the premise of hydrological analogy.

    Paper can be found here.

2024

2025

  • Hydropower has been vital in Europe, providing safe, low-cost, and clean energy, and it accounts for 35% of renewable electricity generation. With the rise of unstable renewable sources, grid stability requires increased flexibility, where hydropower, especially through pumped storage, plays a crucial role. This paper highlights hydropower's evolving importance in ensuring grid stability, meeting 30% of flexibility demands, and modernizing with digital technologies. These findings underscore the need for supportive policies and markets to fully exploit hydropower's potential in Europe's energy transition.

    The publication can be found here

  • This paper presents the current state of hidden hydropower technologies and links them with possible applications in different hydropower potentials. Technologies and potential applications are structured within three main groups (pressurized systems, hydro storage, unpressurised systems), with their mutual interconnections analysed and displayed throughout the paper.

    The publication can be found here

  • Download the paper here

    Hydropower is key to the clean energy transition, leveraging retrofitting and unconventional opportunities in existing infrastructure to optimize resources, enhance resilience, and reduce emissions. Insights from examples in Czechia, South Africa, and Türkiye inform policies and innovations for sustainable energy.

  • Download the paper here

    The EU's 'Fit for 55' targets demand hydropower's flexibility to stabilize grids with 50% renewable energy by 2030. The PEN@Hydropower initiative drives sustainable solutions through innovation, digitalization, AI, and emerging technologies, advancing hydropower's role in EU decarbonization and sustainable energy transitions.

  • Double regulated water turbines offer flexibility due to the requirement of water turbines to operate in a wider operational range to compensate for the intermittency of other renewable energy sources such as wind or solar. In this work, numerical analysis of double regulated turbine has been conducted. In contrast to the Kaplan turbine, where double regulation is performed by changing position of guide vanes and runner blades with a constant number of revolutions of the runner, in this turbine double regulation is performed by changing position of the guide vanes and changing the number of revolutions of the runner. The planned power plant consists of three double regulated turbines of same characteristics, where in this work only the single one was analysed. The analysis is based on steady simulation of a full-scale turbine model, including water intake, guide vanes, runner, draft tube, and outflow section. To investigate turbine efficiency for different fluid flow rates the analysis has been conducted for four different guide vanes opening, namely 26°, 44°, 53°, and 58. Additionally, for 53° guide vanes opening additional investigation has been conducted for different runner rotational speeds. In this case the results indicate that the greatest efficiency is around 200 rpm. Future investigations are planned for other vanes openings.

    Publication can be found here.

  • The development of energy prices over time has depended on several factors. Difficulties and disruptions in local and global energy markets caused by climate change, pandemics and wars have accelerated the transition to clean energy. The overview of electricity generation in four countries (e.g. Lithuania, Italy, Iceland and Austria) is examined. The energy policy outlined in the REPowerEU program focuses on saving energy, producing clean energy and diversifying the energy supply at EU level and in the member states. However, more electricity production from non-dispatchable renewable energy sources has introduced a phenomenon of negative electricity prices, highlighting importance of energy storage. This paper focuses on the contribution that hydropower can bring to the energy market. Two contributions of hydropower assets are crucial in the European energy market for the regulation of the power grid. The flexibility and storage capabilities of reservoir and pumped storage power plants are unmatched by any other technology. These contributions of the hydropower sector to the energy market and the new challenges in the operation of hydropower plants are discussed involving critical analysis of four countries.

    Publication can be found here.

  • The six Western Balkan countries (WB6), which include Albania, Bosnia and Herzegovina, Kosovo, Montenegro, North Macedonia, and Serbia, are in a critical phase of their development and face various economic, political and environmental challenges. Political uncertainties, economic imbalances, and institutional weaknesses have hindered their progress in achieving sustainable development goals. Among these challenges, the energy sector stands out as a priority due to its signiicant impact on economic growth, climate change, and environmental sustainability. The energy landscape in the region is dominated by conventional and non-renewable energy sources, leading to concerns about energy security and environmental degradation. Dependence on fossil fuels exposes these countries to volatile energy prices and increases their contribution to greenhouse gas emissions. There is an urgent need to develop cleaner and sustainable energy sources to promote economic growth while mitigating the harmful effects of climate change. Hydropower capacity in the WB6 countries is estimated to be signiicant and offers the opportunity to generate clean energy. A comprehensive overview of the hydropower potential in the WB6 countries considers factors such as river systems, water availability, topography, and technical capabilities. The promotion of renewable energy, especially sustainable hydropower, is central to achieving a sustainable future in the WB6 countries. By harnessing their hydropower potential and addressing environmental and social concerns, these countries can boost their economic growth, combat climate change, and improve their energy security for a prosperous and sustainable future.

    Publication can be found here.

  • This study examines recent energy transition policies and the conceptual framework of energy justice, emphasising the role of hydropower, in ensuring the equitable distribution of energy services and burdens. The analysis focuses on the EU's energy mix, highlighting the capacity of hydropower and its impact on energy justice, and examines the relationship between migration and energy poverty in countries such as Poland, the Czech Republic and Turkey. In addition to their role as a source of renewable energy, hydropower offer a range of other benefits, including irrigation, flood control, water supply and fisheries. Despite these benefits, the construction of dams can also give rise to several social impacts, including environmental degradation, displacement of local communities and disruption to traditional livelihoods. The study concludes that hydropower remains critical to the EU's transition to a sustainable and equitable energy system and supports social justice through improved energy access and security.

    Link to the paper here.