Pumped Hydro Storage can Solve Intermittency from Renewable Power Sources.

How pumped hydro storage can help save the planet

In pumped hydro storage there is a tried-and-tested technology that not only fits the bill for future energy needs but has been doing the job for well over a century. Andrew Wade reports It's often assumed that to mitigate the worst effects of climate change we need an energy revolution incorporating a raft of new [...]

 Me, "Pumped Hydro can be used in many places as the UK and other places have found out."

From article, (It’s often assumed that to mitigate the worst effects of climate change we need an energy revolution incorporating a raft of new ideas. However, the core technologies needed to decarbonise the power sector already exist in the form of renewables, with wind and solar now the fastest-growing sources of new generation.

One major problem, as critics are quick to point out, is intermittency. If that problem could be solved, the energy sector could be transformed within a few short decades. And, as it happens, several countries are betting that we already have the answer.

In pumped hydro storage there is a tried-and-tested technology that not only fits the bill but has been doing the job for well over a century. First employed in the 1890s, pumped hydro makes up 97 per cent of energy storage worldwide, with around 168GW currently installed. Excess off-peak grid power – theoretically from renewables – is used to pump water uphill, where it’s stored as gravitational potential energy. When electricity demand is high, water is released downhill to power turbines, the elevated reservoirs essentially acting as giant batteries to help balance the grid.

Currently, the UK has four operational plants. When the youngest – Dinorwig in Snowdonia – was built over 30 years ago, it was the largest civil engineering contract ever awarded by the government. Today, just up the road in Glyn Rhonwy, a new pumped storage venture is being developed by private company Snowdonia Pumped Hydro (SPH). With 99.9MW of output and 700MWh of storage capacity, it won’t solve the climate change problem singlehanded. However, the process behind its selection also threw up hundreds of other viable UK sites. By exploiting just a handful of these, pumped hydro could be the last missing piece of the UK’s clean energy puzzle.

Located just to the north of Beijing, the Fengning Pumped Storage Power Station will have an installed capacity of 3,600MW, making it the largest pumped hydro facility in the world. Its generators will be fed by an upper reservoir holding nearly 49 million cubic metres of water – enough to fill about 19,500 Olympic pools. By comparison, each of Glyn Rhonwy’s reservoirs will hold just over 1 million cubic metres.

in Australia the planned Snowy Hydro 2.0 project will look to add pumped storage to the long-established hydro generation already in place. If completed, it will add generation capacity of 2,000MW and a massive 350GWh of storage. This year, a government-backed study by the Australian National University (ANU) into other viable locations identified 22,000 sites, the bulk of which are on the more densely populated east coast. Combined, these could provide around 67,000GWh of storage.)

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