Brussels, 20 November 2025 — ETIP HYDROPOWER released last thursday 20th November three new White Papers dedicated to biodiversity, focusing on some of the most relevant interactions between hydropower operations and river ecosystems: fish mobility, environmental flows and hydropeaking, and sediment dynamics.

Developed by experts from Working Group 2, the series compiles state-of-the-art knowledge, European practices, and recommendations to support hydropower operators, researchers, and policy makers in advancing environmentally sustainable hydropower.

White Paper on Enabling Fish Mobility at Hydropower Plants

This paper highlights the role of fish migration in maintaining river connectivity and biodiversity. It reviews current technologies and solutions to improve upstream and downstream passage, including nature-like and technical fishways, fish lifts, bypass systems, behavioural guidance structures, and fish-friendly turbines.

It stresses the need for:

• Comprehensive site-specific assessments combining hydraulic and biological perspectives. 
• Clear criteria and performance standards for both upstream and downstream measures. 
• Integration of monitoring and adaptive management to ensure effectiveness over time.
• The document also identifies research gaps in areas such as fish behaviour, cumulative impacts, and the performance of innovative downstream solutions.

Download the White Paper on Fish Mobility

White Paper on Environmental Flows and Hydropeaking

This paper explores how environmental flows (E-flows) and hydropeaking management can reconcile river ecosystem needs with flexible hydropower production. It summarises methodologies applied across Europe (from hydrological and habitat-based to integrative approaches) and provides guidance for their implementation.

Key recommendations include:

• Developing robust, transparent, and adaptive E-flow methods grounded in ecological evidence. 
• Implementing long-term monitoring of both hydrological and biological indicators. 
• Considering hydropeaking mitigation measures, such as ramping rate control, re-regulation basins, and coordinated operation of plants.
• The paper calls for harmonised European approaches and the integration of E-flow considerations in hydropower licensing and policy frameworks.

Download the White Paper on E-flow and Hydropeaking

White Paper on Sediment Dynamics

Sediment transport is essential to river morphology, habitats, and infrastructure resilience. This White Paper explains how hydropower operations alter sediment continuity and outlines a comprehensive set of management measures to address it: such as sediment flushing, sluicing, venting, bypassing, replenishment, and dredging.

Its main messages include:

• The importance of catchment-scale and multi-stakeholder planning for sediment management. 
• Promoting integrated monitoring systems to track sediment fluxes and ecological effects. 
• Encouraging research and innovation in emerging solutions such as sediment venting and robotic dredging.
• By re-establishing sediment continuity, these practices can deliver joint benefits for ecosystems and reservoir performance.

Download the White Paper on Sediment Dynamics

Together, the three White Papers illustrate practical ways to achieve “win-win” solutions between hydropower operation and river ecology. They provide knowledge that supports the objectives of the EU Water Framework Directive, the Nature Restoration Regulation, and the Renewable Energy Directive (RED III), contributing to Europe’s broader goals for a climate-resilient and nature-positive energy transition.

Piacenza, Italy — 30 November 2025. At the AQUAWATT Forum, a workshop titled “ETIP HYDROPOWER: Shaping the Future of Sustainable Hydropower in Europe” presented the European Technology and Innovation Platform on Hydropower (ETIP HYDROPOWER) to stakeholders from industry, research, and policy.

Hydropower remains a vital component of Europe’s clean energy transition, providing flexible, reliable, and renewable electricity. The workshop underscored how ETIP HYDROPOWER is designed to unify the sector’s voice, promote innovation and sustainability, and align strategic actions with EU climate and energy objectives.

Platform mission and governance

Antonella Frigerio, Vice Director at RSE and Co-Chair of the ETIP HYDROPOWER Governing Board, opened the session by outlining the platform’s mission, structure, and strategic priorities. She emphasised the need to reposition hydropower as a central pillar of the European Green Deal—able to deliver flexibility, storage, and climate resilience. Frigerio also highlighted the importance of Research and Innovation Agendas (RIA) and the Strategic Industrial Roadmap (SIR) to guide future developments, and called for stronger recognition of hydropower within EU policy frameworks.

Sector challenges and recommended actions

Jean-Jacques Fry, representing the ETIP HYDROPOWER Secretariat, identified three priority challenges for scaling hydropower deployment across Europe:

1. further minimising environmental impacts while meeting increasingly stringent EU regulations;
2. improving public and political awareness of hydropower’s role in the energy transition; and
3. enhancing competitiveness by ensuring appropriate remuneration for system and grid services.

To address these, Fry recommended:

• sustained dialogue with the European Commission through an Implementation Working Group on hydropower to advance the SET Plan;
• targeted awareness-raising among citizens and European decision-makers; and
• collaborative research to boost innovation within a sustainable framework, taking inspiration from approaches such as CEATI in North America

Preview of ETIP HYDROPOWER White Papers

The workshop also served as the exclusive preview of the ETIP HYDROPOWER White Papers developed by the platform’s Working Groups:

• WG1 – Flexibility and Storage: Leonardo Nibbi emphasized the urgent need to recognize hydropower’s unique ability to provide long-duration energy storage, especially through pumped storage, fast ramping to maintain grid stability, and black start capabilities. To fully unlock its potential, investments in innovation, fair market conditions, tailored support mechanisms, proper remuneration, and streamlined permitting by Member States are essential.
• WG2 – Biodiversity: Andrea Abbate and Marco Tangi highlighted three primary challenges: (1) enabling fish migration, (2) managing environmental flow and hydropeaking, and (3) understanding sediment dynamics. They emphasised the importance of integrating ecological considerations into hydropower planning and operations, referencing existing standards and regulations while advocating for unified and standardised strategies grounded in holistic, balanced and robust methods to safeguard river ecosystems.

• WG3 – Climate Change: Arianna Trevisiol, starting from climate projections and expected changes on hydrological cycle impacting on hydropower plants production and safety across Europe, highlighted hydropower’s dual function in mitigation and adaptation. Strengthening its resilience and contribution to climate-proof water and energy systems demands modernizing infrastructure, leveraging digital tools, predictive optimization and real-time monitoring to enhance the efficiency of power production and water management, adopting adaptive resource management strategies, fostering multi-actor collaboration to balance water and energy priorities, integrating science-based climate data into strategic planning, and enhancing cross-border cooperation to optimize benefits and mitigate risks.

In addition, a short video on hydropower’s flexibility potential was premiered, showcasing real-world examples of how hydropower assets across Europe are supporting the integration of variable renewables and enhancing system reliability.

World Hydropower Outlook 2025

Matteo Bianciotto of the International Hydropower Association (IHA) presented insights from the World Hydropower Outlook 2025, including:

• Over 24 GW of new hydropower capacity added globally in 2024, including 8.4 GW of pumped storage.
• Hydropower now supplies 14.3% of global electricity, with Europe contributing 680 TWh in 2024.
• A global pipeline of 1,075 GW, with 600 GW in pumped storage development.
• In Europe, a pipeline with around ten times more pumped storage capacity than conventional hydropower, indicating the region is approaching a point where pumped storage could add more capacity than conventional hydropower.

Policy momentum: the Paris Pledge

Bianciotto also introduced the Paris Pledge, a declaration signed by more than 50 European stakeholders calling for:

1. expansion of long-duration energy storage via pumped hydropower;
2. regulatory reforms to streamline permitting and incentivise investment; and
3. recognition of hydropower’s role in climate adaptation and water management.

The pledge was formally presented to the European Commission in Brussels on 11 September 2025, reinforcing the sector’s commitment to a resilient and decarbonised energy system.

The HYDRO 2025 Conference in Thessaloniki, Greece (22-24 October 2025), brought together over 1,000 participants to discuss innovation from almost 70 countries, to discuss topics ranging from dam safety and environmental management to climate resilience, artificial intelligence applications, and the growing role of pumped storage in renewable energy integration.

Anton Schleiss, Coordinator of ETIP HYDROPOWER, chaired the session on European initiatives supporting hydropower, where five presentations showcased the results of ongoing EU-funded R&I projects. Schleiss also lectured at the pre-conference workshop on pumped storage hydropower, presented the latest achievements of ETIP HYDROPOWER at the IEA Hydro TCP Executive Committee Meeting, joined a World Bank–led roundtable on sedimentation management, and delivered a technical talk on piano key weirs and wooden debris impacts in the Gates and Spillways session.

Denis Aelbrecht, Chair of the ETIP HYDROPOWER Governing Board, chaired the session on Climate change – risk and resilience, while Emanuele Quaranta, Chair of the Working Group on Promotion, Dissemination and Uptake of European R&I Projects, contributed to the Small Hydro session with a presentation on the potential and opportunities for small hydropower in the European Union and the role of emerging policies. He also introduced the European initiatives supporting hydropower session with reflections on how excellence in science and industrial innovation can jointly strengthen Europe’s hydropower sector and policy impact.

During the event, Anton Schleiss, Denis Aelbrecht, and Emanuele Quaranta met with representatives of the European Commission’s DG International Partnerships (Pau Guix Ruiz and Michel Caubet) to discuss ongoing initiatives under the Global Gateway strategy, exploring opportunities to promote public–private hydropower projects worldwide with European sector involvement.

Several other ETIP HYDROPOWER members contributed to the programme, including Sera Lazaridou and Klaus Jorde (Governing Board members) as well as Atle Harby, Cécile Munch Alligné, Luc Deroo, and Miroslav Marence (Scientific Advisory Board members).

Through active participation at HYDRO 2025, ETIP HYDROPOWER highlighted its continued efforts to develop sustainable hydropower solutions and to connect scientific, industrial, and policy perspectives across Europe.

On 17–18 September 2025, the SHF HydroES Conference in Grenoble, France, brought together experts and stakeholders to advance knowledge on hydropower and environmental sustainability. The event provided an important platform for presenting the latest work developed within the ETIP HYDROPOWER Working Groups.

Denis Aelbrecht, Chair of the Governing Board, opened the session with an introduction to ETIP HYDROPOWER and later offered closing reflections. Maryse François presented the White Paper on Flexibility, inviting participants to continue the conversation during the upcoming webinar scheduled for 8 October 2025. Agnès Barillier followed with a presentation of the main messages from the White Paper on E-flows and Biodiversity, while Benjamin Graff shared preliminary insights from the forthcoming White Paper on Climate Change, which will soon be made publicly available.

The two-day conference concluded with a series of technical visits that offered participants hands-on insights into hydropower innovation and sustainability. At the EDF Cheylas pumped storage plant, participants explored sediment management solutions developed by Watertracks through the Nessie technology. At the SuperGrid Institute, the group visited the TM1 Scaled Model test platform (IEC 60193) and the HydroPHIL transient platform, and took part in discussions on hybridisation with batteries, variable speed solutions and the economic value of hydropower in electricity markets. The programme also included a visit to the ARTELAB Modelling Laboratory, managed by Artelia.

At the International Forum on Pumped Storage Hydropower, one of the most anticipated sessions, “Innovating for Grid Flexibility: New Technology Showcase”, highlighted how pumped storage hydropower (PSH) is evolving to meet the demands of renewable-dominated power systems.

The session was co-moderated by Prof. em. Dr. Anton Schleiss, Coordinator of ETIP HYDROPOWER, together with Matteo Bianciotto, Policy and Research Director at the International Hydropower Association (IHA), which is also a partner of ETIP HYDROPOWER. Their moderation reflected ETIP HYDROPOWER’s active role in guiding Europe’s hydropower innovation agenda.

Innovation at the heart of PSH

The debate demonstrated that although PSH is a mature and proven technology, it is constantly adapting to address new challenges. Experts exchanged views on variable speed technology, battery–turbine hybridisation, hydraulic short circuit solutions, plant digitalisation, and design and construction challenges.

Case studies and perspectives

The panel brought together a wide range of international expertise:

• Alexander Speckle, Member of the Board of Directors at TIWAG
• Parveen Nanda, Executive Vice President at Greenko
• Elena Vagnoni, Head of Projects Group, PTMH, EPFL
• Romain Pellegrino, Chief Commercial and Strategy Officer, Hydropower, GE Vernova
• Danilo Moresco, Global Business Line Manager, ABB

Opening the session, Alexander Speckle presented the Kühtai 2 Pumped Storage Plant in Austria, which expands an existing facility to cover winter electricity shortages. He explained how the project integrates variable speed machines and a new reservoir to provide around 0.2 GWh of additional storage. He also underlined that more than €100 million have been invested in environmental mitigation to secure stakeholder trust.

During the debate, Romain Pellegrino stressed that hydropower “remains crucial to balance variable renewables” and warned that regulatory frameworks in Europe are not keeping pace with system needs. Elena Vagnoni shared findings from the XFLEX-HYDRO project, noting that digitalisation and real-time optimisation can “increase efficiency, reduce fatigue, and extend equipment lifetime.” Danilo Moresco emphasised ABB’s investment in innovation, highlighting the role of digital twins, cloud-based architectures, and AI, while underlining the need for “collaboration across utilities, startups, and universities.”

From India, Parveen Nanda presented the Pinnapuram Integrated Renewable Project, the world’s first large-scale combination of 4.5 GW of wind, solar, and PSH under a single grid connection. He explained that hybrid approaches, including batteries and advanced sensors, were essential to keep costs manageable while providing flexibility.

Looking ahead

The session confirmed that pumped storage is far from a “done and dusted” technology. From digitalisation and hybridisation to new partnership models, innovation is reshaping the sector worldwide.

By co-moderating this high-level debate, ETIP HYDROPOWER reaffirmed its leadership in advancing hydropower innovation in Europe, while connecting with global pioneers shaping the clean energy transition.

ETIP HYDROPOWER participated as BRONZE Partner at the International Forum on Pumped Storage Hydropower, held at UNESCO Headquarters in Paris. This high-level global event marked the culmination of a year-long campaign from the International Hydropower Association (IHA) to accelerate action on pumped storage hydropower: the “unsung hero” of the energy transition.

At the Forum, ETIP HYDROPOWER, together with Di-Hydro and STOR-HY, represented the ETIP HYDROPOWER Cluster on the exhibition hall, gathering together some of the most ambitious European projects dedicated to advancing hydropower technology and energy storage solutions. The cluster showcased the latest EU Horizon Europe projects, including: iAMP-Hydro, D-Hydroflex, SHERPA, HYDRO4U, ReHydro, RevHydro, XFLEX-HYDRO, HYPOSO, Store2Hydro, and H-HOPE. Together, these projects embody Europe’s leadership in developing sustainable, flexible, and environmentally responsible hydropower systems.

The Forum took place at a critical moment for global climate action. At COP29, 58 nations committed to the Global Energy Storage and Grids Pledge, setting the ambitious target of deploying 1,500 GW of energy storage, doubling grid investments, and expanding 25 million km of new grid infrastructure by 2030. Hydropower—and particularly pumped storage, which already accounts for around 90% of global long-duration energy storage—will play a decisive role in making these targets a reality.

Despite its proven value and relatively small environmental footprint, pumped storage remains largely unknown to the public. The IFPSH gathered Heads of State, Ministers, CEOs, financial institutions, intergovernmental organisations, and industry leaders to raise awareness and agree on the policies and practices needed to unlock new development.

ETIP HYDROPOWER has signed the Paris Pledge on Pumped Storage Hydropower by IHA and Eurelectric, becoming an official supporting partner of this important initiative presented at the International Forum on Pumped Storage Hydropower in Paris on the 9th of September 2025.

The Paris Pledge acknowledges the urgent and growing need for long-duration electricity storage to ensure a reliable, affordable, and sustainable energy system in Europe. As variable renewable energy sources are projected to reach 86% of Europe’s generation capacity by 2050, the demand for flexibility will increase sevenfold, exceeding 2,000 TWh annually compared to 310 TWh today.

Pumped storage hydropower (PSH), which already represents over 90% of global electricity storage capacity, is identified in the pledge as the most important, scalable, and cost-effective long-duration storage solution available today. Expanding Europe’s PSH capacity is described as essential to:

• Enable large-scale integration of wind and solar power, reducing curtailment (over 12 TWh of renewable electricity was curtailed in 2023, costing €4.3 billion)
• Stabilise electricity markets by lowering peak prices and system costs
• Enhance resilience and provide recovery capacity after blackouts
• Strengthen European supply chains and create economic opportunities;
• Contribute to climate adaptation through water management solutions

By supporting the pledge, ETIP HYDROPOWER reinforces its role in advancing evidence-based knowledge, innovation, and dialogue to accelerate the deployment of pumped storage hydropower in Europe.

“In his Research and Innovation Agenda as well as in the Strategic Industry Roadmap, ETIP HYDROPOWER has identified pumped storage hydropower as a vital contribution to the safe energy transition in Europe.”

-Anton Schleiss. 

You can read the full pledge here

The Di-Hydro Project is pleased to announce its First Project Workshop, an interactive online event dedicated to exploring how digital technologies can drive innovation within the hydropower sector. The workshop is designed to encourage knowledge-sharing and meaningful discussions on how digitalisation can support the development of hydropower both within the Di-Hydro Project and across the broader industry.

As part of its commitment to advancing the potential of hydropower plants and clusters, the Di-Hydro Project seeks to transform the operation of hydropower facilities through the integration of digital technologies—making them more intelligent, efficient, and environmentally sustainable.

Event Details:

• Date: 25 July 2025
• Time: 15:00–16:00 CEST
• Location: Online (Participation is free of charge; registration is required)

Professionals, researchers and stakeholders with an interest in hydropower and digitalisation are warmly invited to attend. The workshop will provide a valuable opportunity to exchange insights, explore current trends, and discuss future applications of digital solutions in the hydropower sector.

Registration is open until 24 July 2025 and can be completed via the following link: Register here.

The latest special issue of HYDROLINK (2/2025), published by the International Association for Hydro-Environment Engineering and Research (IAHR), sheds light on the vital and evolving role of pumped storage hydropower (PSH) in global energy systems. Over the past fifty years, PSH has expanded significantly—initially serving as a solution to store surplus energy from thermal and nuclear plants during low-demand periods, and more recently, as a flexible backup to address the intermittency of wind and solar generation.

Several experts from the ETIP HYDROPOWER Forum contributed their insights and research to this special edition, emphasizing PSH’s critical role in supporting a secure and sustainable energy transition:

• Pumped Storage Hydropower in Arid Climates: A Crucial Asset for Energy Transition. Benoît Houdant and Thomas Pinchard (EDF) explore how PSH projects in water-scarce regions can enhance grid stability while contributing to renewable integration. Read more. 
• Design Challenges in the Renaissance of Pumped-Storage Hydropower to Support the Energy Transition. Anton Schleiss (ETIP HYDROPOWER, EPFL) examines the engineering and environmental challenges driving modern PSH development. Read more.
• The Critical Role of Power Intake/Outlet Structures in Pumped Storage Schemes: Design Challenges and Optimization. Azin Amini and Giovanni De Cesare (EPFL) highlight the significance of hydraulic structures in optimizing PSH scheme efficiency and reliability. Read more.
• Pumped-Storage Technology: Fixed vs. Variable Speed. Michael Schmid (Andritz) analyzes the benefits and limitations of fixed and variable speed technologies in modern PSH plants. Read more.

This special issue underscores the strategic importance of pumped storage hydropower as a cornerstone technology for a decarbonized and resilient energy future. Access the full issue at HYDROLINK 2/2025.