{"id":363101,"date":"2025-12-23T04:27:10","date_gmt":"2025-12-23T04:27:10","guid":{"rendered":"https:\/\/www.newsbeep.com\/ca\/363101\/"},"modified":"2025-12-23T04:27:10","modified_gmt":"2025-12-23T04:27:10","slug":"this-giant-inflatable-dome-is-actually-a-co2-battery-designed-to-store-renewable-energy-for-a-full-day-heres-how-it-works","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/ca\/363101\/","title":{"rendered":"This Giant Inflatable Dome Is Actually a CO2 Battery Designed To Store Renewable Energy For a Full Day. Here\u2019s How It Works"},"content":{"rendered":"

\"\" <\/a>Credit: Energy Dome. <\/p>\n

On the Italian island of Sardinia, a strange, gleaming bubble rises from a patch of flat land. It\u2019s held upright not by steel or concrete but by a small imbalance in pressure. Inside it sits 2,000 tonnes of carbon dioxide. But this time, the greenhouse gas is not the by-product of some polluting activity. Rather than a climate crime waiting to happen, this humble-looking dome is doing a very important job.<\/p>\n

The structure belongs to a new kind of power plant, built by the Milan-based firm Energy Dome. Its purpose is deceptively simple: to hold on to electricity when there is too much of it, and give it back when there is not enough and the grid needs it most. In a world racing to replace coal and gas with wind and sunlight, that modest trick has become one of the hardest problems in energy science.<\/p>\n

The solution on Sardinia, known as the CO\u2082 Battery, relies on familiar physics rather than exotic chemistry seen elsewhere. Carbon dioxide is compressed, cooled, stored, and allowed to expand again using excess energy generated by solar panels during sunny days. In doing so, the gas turns turbines as it goes. <\/p>\n

If the idea sounds counterintuitive \u2014 using a greenhouse gas to help fight climate change \u2014 that\u2019s because it is. But it may also be one of the most practical answers yet to a stubborn problem that has slowed the global shift away from fossil fuels.<\/p>\n

The Storage Problem That Won\u2019t Go Away<\/p>\n

Solar panels and wind turbines generate clean power, but they can\u2019t do so around the clock like a coal- or gas-fired power plant. The sun sets and the wind stalls. Meanwhile, people still cook dinner, cool or heat their homes, and stream videos.<\/p>\n

\"3D <\/a>Rendering of an Energy Dome large-scale CO2 Battery project next to solar PV array. Image: Energy Dome.<\/p>\n

Today\u2019s most common solution is the lithium-ion battery. It works well for phones, cars, and short grid backups. But at large scale, lithium-ion systems usually provide only four to eight hours of power. That\u2019s not enough to get through a long night, let alone several days of cloudy weather.<\/p>\n

Engineers have tried many alternatives. They\u2019ve compressed air, heated sand, split water into hydrogen, stacked massive weights, and pumped water uphill. Speaking of which, pumped hydro remains the gold standard<\/a> for long-duration storage, but it requires specific landscapes, large reservoirs, and years of construction. You just can\u2019t do it anywhere. <\/p>\n

So right now this means the clean energy industry is still limited by this bottleneck. Renewable energy keeps getting cheaper and more abundant, yet grids still lean on gas and coal plants for reliability.<\/p>\n

That\u2019s the gap Energy Dome wants to fill.<\/p>\n

How a CO\u2082 Battery Actually Works<\/p>\n

At Energy Dome\u2019s commercial plant in Ottana, Sardinia, excess electricity from wind or solar power runs compressors that squeeze carbon dioxide gas until it turns into a liquid. That liquid CO\u2082 is stored in steel pressure tanks, each roughly the size of a school bus.<\/p>\n

When the grid needs power, the system reverses itself. The liquid CO\u2082 heats up, expands back into a gas, and rushes through a turbine. The spinning turbine generates electricity, which flows back to the grid. The gas then returns to the dome, ready for the next cycle.<\/p>\n

\u201cThis is incredible,\u201d said Emily Waltz, an editor at IEEE Spectrum<\/a> who visited the Sardinia plant. \u201cIt is. But it\u2019s physics,\u201d quipped her tour guide Mario Torchio, Energy Dome\u2019s global marketing director.<\/p>\n

The entire system is closed. The carbon dioxide never leaves. It simply shifts between gas and liquid, again and again. And that\u2019s indeed pretty elegant engineering. <\/p>\n

Unlike lithium-ion batteries, this setup can deliver power for 10 hours \u2014 or even up to a full day. According to Google<\/a>, which recently made a strategic investment in Energy Dome, the system can provide \u201ccompletely clean energy into the grid for up to a full 24 hours.\u201d<\/p>\n

Why Big Tech Is Paying Attention<\/p>\n

\"Image <\/a>\u00a0Artist\u2019s impression of Energy Dome\u2019s CO2\u00a0thermal energy storage battery<\/p>\n

Google is not known for dabbling lightly in infrastructure. Yet in July, the company announced a partnership \u2014 and an investment \u2014 with Energy Dome. The goal is to deploy CO\u2082 Batteries near Google data centers in Europe, the United States, and the Asia-Pacific region.<\/p>\n

\u201cWe\u2019ve been scanning the globe seeking different solutions,\u201d said Ainhoa Anda, Google\u2019s senior lead for energy strategy, speaking to IEEE Spectrum. \u201cSo standardization is really important, and this is one of the aspects that we really like\u201d about Energy Dome. \u201cThey can really plug and play this.\u201d<\/p>\n

Google has pledged to run all its operations on 24\/7 carbon-free energy by 2030. But if they\u2019re really serious, their promise has to go beyond buying renewable power on paper, though carbon credits or some other mechanism that only passes climate responsibility on to someone else\u2019s shoulders. It means matching clean electricity to every hour of demand, everywhere the company operates.<\/p>\n

Data centers consume enormous amounts of power, and they cannot simply shut down when the wind drops. Long-duration, climate-friendly storage offers a way to keep servers running without falling back on fossil fuels.<\/p>\n

\u201cGoogle is committed to powering our operations with clean energy, and Energy Dome\u2019s technologically proven and scalable long-duration energy storage solution can help us unlock rapid progress,\u201d said Maud Texier, Google\u2019s director of EMEA energy, in an earlier statement from July 2025. <\/p>\n

A Battery Built From Familiar Parts<\/p>\n

One reason Energy Dome\u2019s idea is so appealing is its simple yet effective engineering. The system uses compressors, turbines, steel tanks, and carbon dioxide. This is the kind of equipment already common in industrial settings.<\/p>\n

This battery doesn\u2019t require lithium, cobalt, or other critical minerals that strain global supply chains. It doesn\u2019t need mountains or deep caverns. It can be built almost anywhere with about five hectares of flat land.<\/p>\n

Energy Dome expects its systems to last nearly three times as long as lithium-ion batteries. The company also says larger installations get cheaper per unit of energy, not more expensive. According to IEEE Spectrum, Energy Dome estimates its technology will be about 30 percent cheaper than lithium-ion storage at scale.<\/p>\n

This economic profile has drawn interest far beyond Google. India\u2019s largest power producer, NTPC Limited, plans to build a CO\u2082 Battery at its Kudgi power plant by 2026. In Wisconsin, Alliant Energy has approval to construct one that could power 18,000 homes. Chinese firms are reportedly building similar dome-based systems in Xinjiang.<\/p>\n

\u201cThey are developing something very, very similar but quite large in scale,\u201d said Energy Dome founder and CEO Claudio Spadacini, speaking to IEEE Spectrum. Of his Chinese competitors, he added, \u201cThey are good, they are super fast, and they have a lot of money.\u201d<\/p>\n

What Could Go Wrong?<\/p>\n

The domes are hard to miss. They take up more land than lithium-ion batteries and rise high above the surrounding landscape. In some places, that visibility could trigger local opposition. Not in my back yard<\/a>, remember? <\/p>\n

Then there\u2019s the obvious fear: what happens if the dome ruptures?<\/p>\n

Spadacini says the structure can withstand winds up to 160 kilometers per hour. With enough warning, operators can deflate the dome and store all the CO\u2082 in tanks. If the worst happens, the gas would escape into the atmosphere. Yes, that would ironically contribute to global warming but that\u2019s nothing compared to the regular emissions of a coal plant. Spadacini notes that a full release equals about 15 round-trip flights between New York and London on a Boeing 777.<\/p>\n

People would need to stay about 70 meters away until the gas disperses. It\u2019s not nothing \u2014 but in a world still burning fossil fuels daily, it\u2019s a small risk.<\/p>\n

From One Island to a Global Grid<\/p>\n

\"\" <\/a><\/p>\n

The Sardinia plant generates 20 megawatts of power and stores 200 megawatt-hours of energy. It\u2019s the first full-size, grid-connected CO\u2082 Battery in the world, completed in July. Energy Dome says replicas can be built in under two years, with the dome itself inflated in half a day.<\/p>\n

According to the International Energy Agency<\/a>, the world will need more than 1,500 gigawatts of energy storage by 2050 to meet climate goals. Today, we have only a fraction of that.<\/p>\n

Long-duration storage won\u2019t replace every battery or every dam. But it could change how grids think about reliability. Instead of treating renewables as fragile and intermittent, systems like the CO\u2082 battery let them behave more like steady, dependable power plants.<\/p>\n

For decades, carbon dioxide has symbolized the damage done by industrial society. Inside a giant bubble on Sardinia, it\u2019s being reimagined as something else entirely: a working fluid for a cleaner future.<\/p>\n


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