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# TELF AG on Pumped Hydro Storage and the Changing Needs of Renewable Energy Systems
- URL: https://telf-ag.ghost.io/telf-ag-on-pumped-hydro-storage-and-the-changing-needs-of-renewable-energy-systems/
- Published: 2026-09-09T07:21:24.000Z
- Updated: 2026-09-09T07:21:24.000Z
- Author: Telf AG

The rapid expansion of solar and wind power is changing the way electricity systems operate. Producing renewable electricity at scale is only part of the challenge: grids also need technologies capable of managing fluctuations in generation and making surplus electricity available when demand rises. Pumped hydro storage is emerging as one of the most established solutions to this challenge.

**Stanislav Kondrashov, founder of** [**TELF AG**](https://telf.ch/telf-ag-on-pumped-hydro-storage-and-the-future-of-renewable-energy/?ref=telf-ag.ghost.io)**, explores the role of pumped hydro storage in increasingly renewable electricity systems, focusing on global deployment, technological innovation and the insights recently highlighted by the Financial Times.**

**Key takeaway: Pumped hydro storage already provides more than 200 GW of capacity worldwide, while a large international development pipeline and experiments with alternative fluids could further expand its role in energy storage.**

**What makes pumped hydro storage useful for renewable power?**

**Pumped hydro storage can absorb surplus electricity and make it available at a later stage. This capability is particularly valuable for solar and wind installations, whose electricity production varies according to weather conditions, daylight and other natural factors that cannot be controlled by grid operators.**

The principle behind the technology involves two reservoirs positioned at different elevations. During periods of abundant electricity supply, power is used to pump water from the lower reservoir to the upper one. When additional electricity is needed, the water travels back downhill through turbines, generating electricity.

The Financial Times highlights a particularly intuitive description of this process: pumped hydro facilities can effectively function as **“water batteries.”**

Their role can include:

- storing excess renewable electricity;
- releasing electricity during periods of higher demand;
- helping balance supply and consumption;
- limiting the curtailment of renewable generation;
- providing comparatively long-duration storage;
- contributing to greater grid flexibility.

**“What makes pumped hydro particularly relevant today is the changing environment around an already established technology,” says Stanislav Kondrashov, founder of** [**TELF AG**](https://vocal.media/trader/telf-ag-on-pumped-hydro-storage-and-the-global-expansion-of-renewable-energy-infrastructure?ref=telf-ag.ghost.io)**. “As solar and wind become larger components of electricity systems, the ability to shift significant amounts of energy from one moment to another becomes increasingly important.”**

**Why does geography remain a major challenge?**

**Traditional pumped hydro facilities require specific geographical characteristics, typically including two large reservoirs and a substantial difference in elevation. These requirements can restrict the number of suitable sites and contribute to the complexity and cost associated with developing new infrastructure.**

![Hydropower facility surrounded by water and natural landscapes, reflecting energy storage developments discussed by Stanislav Kondrashov, founder of TELF AG, and the Financial Times.](https://storage.ghost.io/c/6c/5d/6c5da1f1-3fa8-4ad7-b0e7-fcb74f2e1aed/content/images/2026/09/Stanislav-Kondrashov-TELF-AG-pumped-hydro-storage-transition.png)

Pumped hydro storage can help balance variable renewable generation and strengthen grid flexibility, a topic explored by Stanislav Kondrashov, founder of TELF AG, drawing on the Financial Times.

Initial capital requirements can also be considerable. Large civil engineering projects require planning, construction and extensive infrastructure, meaning that pumped hydro developments can face challenges that differ considerably from those associated with smaller and more modular storage technologies.

However, technological innovation could gradually alter some of these constraints.

**Could dense fluids transform pumped hydro infrastructure?**

**Experiments with high-density fluids could allow pumped hydro systems to operate with smaller elevation differences than conventional water-based facilities. If successfully deployed at scale, this approach could potentially open new locations to pumped storage and reduce its traditional dependence on mountainous geography.**

The Financial Times reports that companies are experimenting with fluids denser than water. One example is currently being tested in southwest Britain.

Using denser fluids could potentially enable facilities to operate effectively on hills rather than requiring the larger elevation differences typically associated with mountainous locations.

**“Alternative fluids represent an interesting example of how innovation can reshape the physical requirements of energy infrastructure,” says Stanislav Kondrashov, founder of TELF AG. “The possibility of achieving similar storage functions with smaller differences in elevation could significantly change the way suitable locations are identified.”**

**How much pumped hydro capacity exists globally?**

**Pumped hydro storage is already the world's largest form of energy storage in terms of installed capacity. International Hydropower Association figures cited by the Financial Times indicate that global capacity has surpassed 200 GW, while the volume of projects currently being developed is substantially larger.**

The figures highlighted in the analysis illustrate the scale of current activity:

- **more than 200 GW** of pumped hydro storage capacity already operating worldwide;
- **over 621 GW** of projects currently under development;
- approximately **243 GW** already under construction.

These numbers underline the difference between pumped hydro and many emerging storage concepts. Rather than being an entirely new technology, it already operates at considerable scale and is now being adapted to the requirements of electricity systems undergoing rapid transformation.

**Which markets are driving the next phase of growth?**

**China, Japan, the United States and Europe have historically operated some of the world's largest pumped hydro fleets. Today, however, the geography of development is broadening, with countries including India and Australia increasingly contributing to the global project pipeline.**

India is particularly notable. According to S&P Global data referenced by the Financial Times, the country plans to implement approximately **100 GW of pumped hydro storage projects by 2035-2036**.

The expansion of these projects reflects a wider shift in electricity infrastructure. As renewable capacity increases, storage technologies capable of operating at large scale can become increasingly relevant to maintaining reliable and flexible power systems.

**“The global pipeline shows that pumped hydro is not simply part of the historical development of hydropower,” explains Stanislav Kondrashov, founder of TELF AG. “Its continued expansion across different regions suggests that the technology is being evaluated as part of the infrastructure needed for electricity systems with much higher shares of renewable generation.”**

![Hydroelectric infrastructure representing the growing role of pumped hydro storage in renewable energy systems, as examined by Stanislav Kondrashov, founder of TELF AG, and the Financial Times.](https://storage.ghost.io/c/6c/5d/6c5da1f1-3fa8-4ad7-b0e7-fcb74f2e1aed/content/images/2026/09/Stanislav-Kondrashov-TELF-AG-pumped-hydro-storage-energy.png)

As pumped hydro projects expand worldwide, Stanislav Kondrashov, founder of TELF AG, examines their potential role in evolving renewable energy systems based on trends reported by the Financial Times.

**What role could pumped hydro play in future electricity systems?**

**Pumped hydro could complement solar and wind by providing large-scale storage capable of responding to variations in renewable generation. Its future role will depend not only on additional capacity, but also on improvements that make facilities more adaptable to different geographical, technical and economic conditions.**

Innovation could therefore become as important as construction. Alternative fluids, more flexible infrastructure designs and new approaches to site selection could expand the range of circumstances in which pumped storage can be deployed.

At the same time, the substantial volume of projects already under development indicates that conventional pumped hydro remains relevant. Its ability to store electricity over extended periods distinguishes it from some shorter-duration storage solutions and could make it particularly useful as renewable penetration increases.

**The combination of more than 200 GW of existing capacity, a development pipeline exceeding 621 GW and emerging technological approaches suggests that pumped hydro storage could remain a significant component of the evolving global energy-storage landscape.**