Finding green energy when the winds are calm and the skies are cloudy has been a challenge. Storing it in giant concrete blocks could be the answer.
, by 2023 total installed wind and solar capacity will surpass that of natural gas. By 2024 it will shoot past coal and a year later renewables as a whole are set to become the single largest source of electricity generation worldwide. “If we are serious about trying to deal with climate change, we better be in a situation where we are moving towards a high renewables penetration system,” says Dharik Mallapragada, a research scientist at Massachusetts Institute of Technology’s Energy Initiative.
All of these problems are down to a fundamental quirk of electricity: It is impossible to store. A spark of electricity produced at a coal-fired power plant cannot stay still; it has to go somewhere. To keep networks in balance, grid operators are constantly matching supply and demand, but the more wind and solar you add to the grid, the more uncertainty you introduce into this balancing act.
The price of Energy Vault’s systems might not have so far to fall. Every facility will require the construction of a new building, although Gross says the team is already working on ways to cut costs by reducing the amount of material required and automating parts of the construction. One advantage it has is the weights. The several thousand 30-ton blocks in each EVx system can be made out of soil from the building site or other materials destined for landfill, plus a little binder.
Has the moment for gravity energy storage finally arrived? In the last decade, multiple gravity startups have launched, failed and then reappeared in different forms. None of them have yet sold and built a system for a customer, although Energy Vault has eight deals signed with several projects slated to begin by the middle of 2022.
France Dernières Nouvelles, France Actualités
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