China's mountains turned to batteries: a solution to renewable energy overload?

China's relentless pursuit of megastructures has once again proven visionary, this time in the realm of renewable energy. The notion of transforming mountains into giant batteries may evoke images of science fiction, but experts say it's a logical solution to the country's solar and wind power surplus.

Renewable energy overload

By 2025, China had already exceeded its 2030 target of 1,200 gigawatts of renewable energy capacity, reaching 1,840 GW - nearly half of the nation's total energy consumption. The challenge now is managing this intermittent energy influx.

Unlike traditional power plants, renewable sources like solar and wind can't be simply turned on and off as demand fluctuates. This excess energy must be stored for later use, lest it be wasted. Enter China's innovative plan: harnessing its mountains as natural batteries.

The pumped hydro storage solution

Pumped hydro storage, a technology that's been around for decades, involves two reservoirs - one at a higher elevation and the other lower. When excess renewable energy is available, it's used to pump water from the lower reservoir up to the upper one, effectively storing energy in the form of potential gravitational power.

When demand spikes, the process reverses: the water is released, flowing back down through turbines to generate electricity. China's vast mountainous regions offer a prime canvas for this technology, with hundreds of potential sites.

According to the China Energy Storage Alliance, the country's storage capacity is projected to reach 291 GW by 2030 - a significant boost from current levels. However, as energy consumption continues to rise, driven by data centers and infrastructure growth, experts wonder if this will be enough to meet future demands.