As the world transitions to renewable energy sources, a stalwart ally has been quietly serving the grid for over a century: pumped hydro storage (PHS). But beneath its eco-friendly façade, PHS is hiding a dirty secret: it’s a major bottleneck to the widespread adoption of clean energy.
For decades, PHS has been hailed as the ultimate backup power source for intermittent renewables like solar and wind. By storing excess energy as compressed water in a reservoir, PHS can release it as needed to stabilize the grid. But this narrative has been perpetuated by the very same industries that stand to gain from the status quo. The reality is far more complex – and concerning.
The problem begins with the sheer scale of PHS. Currently, the world’s largest PHS facility, Austria’s Walchensee reservoir, has a capacity of just 1.2 GW. Compare that to the 20 GW of solar power that was installed in just the first quarter of 2022 alone. The numbers are staggering, and it’s clear that PHS is woefully inadequate to meet the demands of the renewable energy revolution.
Learn more: Riding the Solar Wave: The Rise of Floating Solar Farms
But size is just one issue – the environmental impact of PHS is another, often-overlooked concern. Building and maintaining PHS facilities requires massive amounts of concrete, steel, and other resources, resulting in significant greenhouse gas emissions. And when we consider the immense water requirements for PHS, the picture becomes even more dire. In California’s Imperial Valley, for example, a proposed PHS facility would divert over 100 million gallons of water per day – a staggering amount that could quench the thirst of entire cities.
So, what’s the holdup? Why aren’t we investing in more innovative, flexible, and sustainable energy storage solutions? The answer lies in the entrenchment of the traditional energy industry. Fossil fuel companies, utilities, and other stakeholders have a vested interest in maintaining the status quo – and they have the lobbying power to ensure that PHS remains the go-to solution.
But there’s hope on the horizon. Companies like Tesla and BMW are pioneering new energy storage technologies, like lithium-ion batteries and hydrogen fuel cells, that are poised to disrupt the PHS monopoly. These innovations offer the potential for decentralized, scalable, and virtually emissions-free energy storage. It’s time to rethink our assumptions about PHS and invest in a cleaner, more sustainable energy future.
The world needs a more nuanced conversation about the role of PHS in the transition to renewables. By acknowledging its limitations and exploring alternative energy storage solutions, we can unlock a more sustainable, equitable, and environmentally conscious energy landscape for all. The time to pump the brakes on PHS is now – and to accelerate the development of a cleaner, greener energy future.
