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The Unsung Hero of Renewable Energy: Pumped Hydro Storage

Posted on May 18, 2025 By Dante No Comments on The Unsung Hero of Renewable Energy: Pumped Hydro Storage

As the world continues to transition towards a more sustainable energy future, one technology has been quietly providing a vital service: pumped hydro storage. While solar and wind power get all the headlines, pumped hydro storage (PHS) is the behind-the-scenes workhorse that helps keep the lights on and the grid stable.

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So, what exactly is pumped hydro storage? In simple terms, it’s a way to store excess energy generated by renewable sources, like solar and wind power, and then release it back into the grid when it’s needed most. It works by pumping water from a lower reservoir to an upper reservoir during off-peak hours, using the excess energy. When the energy demand is high, the water is released back to the lower reservoir, generating electricity through hydroelectric turbines.

The benefits of PHS are numerous. For one, it’s a proven technology that’s been around for decades. It’s also highly efficient, with some systems reaching efficiencies of up to 90%. And, because it uses excess energy to pump water, it can be paired with renewable sources like solar and wind to create a reliable and dispatchable power source.

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But PHS isn’t just a niche technology for enthusiasts – it’s also a crucial component of the energy mix. In fact, it’s one of the largest sources of electricity storage globally, accounting for over 90% of the world’s total storage capacity. And as the global demand for energy storage grows, PHS is poised to play an even bigger role.

So, why hasn’t PHS gotten more attention? One reason is that it’s often associated with traditional hydroelectric power plants, which can be limited by geography and water supply. However, modern PHS systems are designed to be more flexible, and can be built in a variety of locations, including dry land.

Another reason is that PHS is often seen as a “baseload” technology – something that provides a steady, reliable source of power. But in reality, PHS can be adapted to meet changing energy demands, making it an ideal partner for variable renewable energy sources.

As the world continues to grapple with the challenges of climate change, energy security, and grid resilience, PHS is an unsung hero that deserves more recognition. It’s a proven technology that can help us transition to a more sustainable energy future, and it’s time to give it the spotlight it deserves.

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