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The future of power is transcontinental supergrids that connect the world’s energy supplies



Today if you generate electricity in one part of the world you can’t transport it to any other place in the world – supergrids are a paradigm shift.


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In 2016 the governments of some of the world’s richest countries came together to discuss plans to join together their regional and continental power grids in a move that would revolutionise how electricity is moved around the world. No longer, for example would electricity generated in the solar and wind farms of the Gobi Desert only be for the local Asian market – it, like the electricity from every other energy generation project on the planet, could be transmitted anywhere where there was demand for it.

Last year Australia moved forwards with their plans to connect their grids to the Asian continental power grid in a move that would finally let them literally “export” electricity generated from their solar projects to their neighbours.


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Ever since President Xi Jinping pitched the idea of a “global energy internet” to the United Nations six years ago, China’s been trying to persuade the world to move forwards and build the high voltage highways that would form its backbone.

So far though China’s note worthy plan to wrap the planet in a web of intercontinental, made-in-Beijing power lines has gone pretty much nowhere. Yet the fortunes of these so-called supergrids appear to be turning, if not on quite the spectacular, Bond-villain scale Xi first envisaged.


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China has both a manufacturing and technological edge in Ultra-High-Voltage Direct Current (UHVDC) transmission lines, and has taken a lead in proposing global technical standards and governance for them. If Xi’s plans are ever realised, those are advantages that some believe could have profound geopolitical implications, granting China power and influence similar to what the US gained by shaping the global financial system after World War II.


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Yet it isn’t China that’s driving renewed interest in cables that can power consumers in one country with electricity generated hundreds, even thousands, of miles away in another. That’s because carbon-neutrality commitments, technological advances, and improved cost incentives are accelerating a broad expansion of renewable power generation.

Coal, gas and even nuclear plants can be built close to the markets they serve, but the utility-scale solar and wind farms many believe essential to meet climate targets often can’t. They need to be put wherever the wind and sun are strongest, which can be hundreds or thousands of miles from urban centers. Long cables can also connect peak afternoon solar power in one time zone to peak evening demand in another, reducing the price volatility caused by mismatches in supply and demand as well as the need for fossil-fuelled back up capacity when the sun or wind fade.

As countries phase out carbon to meet climate goals, they’ll have to spend at least $14 trillion to strengthen grids by 2050, according to Bloomberg New Energy Finance. That’s only a little shy of projected spending on new renewable generation capacity and it’s increasingly clear that high- and ultra-high-voltage direct current lines will play a part in the transition. The question is how international will they be?


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In April, the European Union set up a working group to help supersize its grid, already the world’s most developed international system for trading electricity, with goals including development of a multi-nation offshore network for wind farms. Denmark in February announced plans to construct one piece, a $34 billion artificial Energy Island that will sit at the heart of a hub-and-spoke transmission system. With an eventual targeted capacity of 10 gigawatts, the project would add two-thirds to Denmark’s total existing generation capacity, too much to serve only its home market.

Even in the US, which has lagged on grid integration—as the deadly, multiday blackout in Texas revealed in February—interest is stirring. A March report from Breakthrough Energy, a group funded by Microsoft founder Bill Gatesoffered scenarios for transcontinental HVDC lines to unite the US’s three, still-separate grids.

President Joe Biden’s infrastructure proposal includes $100 billion for power grids and would establish a new Grid Deployment Authority “to spur additional high priority, high-voltage transmission lines” along federal highways, although it isn’t sure how much of that will make it through Congress. And a study commissioned by agencies in Canada, Mexico, and the US on the potential to connect their grids is due to be published this year.


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For people who’ve been promoting the idea of supergrids for years, it feels as though the winds have turned in their favor.

“I think our time has come,” says Mika Ohbayashi, director of the Renewable Energy Institute, a Tokyo-based organization set up in the wake of the 2011 Fukushima nuclear disaster by Softbank Group founder Masayoshi Son. Its mission is to promote a Northeast Asia supergrid that would connect China, Japan, Mongolia, Russia, and South Korea.

Says Ohbayashi: “I cannot imagine a Japan in 2050 which is still isolated from everywhere else.”

Europe has been building HVDC connectors to allow the controlled supply of power from one nation’s AC grid to another for decades: In 2018, European countries traded just over 9% of their electricity across borders, compared to less than 2% in the Americas and 0.6% in Asia, according to the International Energy Agency. The trade tends to reduce prices by increasing competition. It also boosts resilience, ensuring that should one nation’s grid suffer a catastrophic outage, it could simply draw from others to keep the lights on.


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But it’s the need for long-distance transmission that is driving a lot of the interest in supergrids right now, as the dash to replace fossil fuels with renewable energy gathers pace. That’s especially true for offshore windfarms, seen as a key growth area for renewables. Although converting from AC to DC and back again at each end of a cable is expensive, lower loss rates mean that HVDC power lines become economical over distances higher than about 500 miles (800km) above ground, and 31 miles (50km) for buried and submarine cables.

Hornsea 1, currently the world’s largest offshore windfarm is 120 kilometers (75 miles) off the UK coast. Dogger Bank, an even bigger British project once complete, will be 5 miles further. And with the development of turbines on floating platforms from companies like GE, there are few limits on how far windfarms can be pushed out to sea. This month Hitachi ABB Power Grids, a major provider of HVDC technology launched a new line of transformers developed specifically for floating turbines.

HVDC cables can also make viable the construction of remote, power plant-size renewable installations on land. Mongolia’s Gobi Desert is at the heart of the Northeast Asia supergrid project promoted both by China and Ohbayashi’s institute. In theory, the Gobi has the staggering potential to deliver 2.6 Terawatts of wind and solar power – more than double the US’s entire installed power generation capacity – to a group of Asian powerhouse economies that together produce well over a third of global carbon emissions. The Gobi’s potential remains largely unrealised, in part because there is currently little means to deliver the power produced there beyond Mongolia’s tiny market.


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The same goes for the US where with the right infrastructure, New York could tap into sun and wind rich resources from the South and Midwest. An even more ambitious vision would access power from as far afield as Canada or Chile’s Atacama Desert, which has the world’s highest known levels of solar power potential per square meter.

Jeremy Rifkin, a US economist who has become the go-to figure for countries looking to remake their infrastructure for the digital and renewable future, sees potential for a single, 1.1 billion-person electricity market in the Americas that would be almost as big as China’s. Rifkin has advised Germany and the EU, as well as China; Xi’s vision of a global energy network is straight out of his 2011 book, The Third Industrial Revolution.

Persuading countries to rely on each other though to keep the lights on is tough, but the universal, yet intermittent nature of solar and wind energy also makes it inevitable, according to Rifkin.

“This isn’t the geopolitics of fossil fuels,” owned by some and bought by others, he says. “It is biosphere politics, based on geography. Wind and sun force sharing.”


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If transcontinental, submarine electricity superhighways indeed lie in our shared future, China is showing the way. In December, it completed a $3.45 billion, 970-mile-long, 800-kilovolt UHVDC line to carry solar and wind generated power from the high Tibetan plains to China’s center. That followed construction of a 1.1 million-volt cable that can transmit up to 12,000 megawatts of power – a little more than the entire installed generation capacity of Ireland – from the deserts and mountains of Xinjiang province to the doorstep of Shanghai, almost 2,000 miles east – high voltage cables are classed as 500 kilovolts and above, while ultra-high voltage – a Chinese specialty – operate at 800 kilovolts or above.

The global supergrid effort has been spearheaded by Liu Zhenya, a former head of the State Grid of China (SGCC), who chairs the Global Energy Interconnection Development and Cooperation Organization, a UN-backed body based in Beijing. Geidco’s phased plan starts by strengthening national grids and moves on to building regional networks, before finally, circa 2070, completing construction of a full 18-channel Earth-spanning grid.

SGCC, which is the world’s largest utility, has been on a buying spree that’s enabling it to do some of that first-stage strengthening. Since 2008, it has acquired stakes as high as 85% in electricity distribution companies in the Philippines, Portugal, Australia, Hong Kong, Brazil, Greece, Italy, and last year, Oman. Other Chinese companies have also been buying shares in foreign grids.


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“From a US perspective, this is something to be worried about,” says Phillip Cornell, an energy specialist at Washington’s Atlantic Council. “It isn’t that ‘I will cut off your power,’ like Russia cut off gas supplies to Europe in 2006, or like OPEC in the ‘70s. But the equation with the global financial system is a good one. You are laying down the backbone of countries’ power systems, and there is a lot of hardware and software involved. All of a sudden, you are in a Chinese ecosystem.”

Such ecosystem concerns led the US to pressure allies to bar China’s Huawei from participating in the building of 5G networks. In the age of the Internet of Things, electricity grids and communications networks will increasingly provide access to each other, an assumption that lies at the heart of Xi’s global energy plan.

“Is there potential for backdoor access by the Chinese state?’’ asks Cornell. “There is certainly a lot of access to consumer information—and you can imagine that, in future, would create a lot of leverage.”

If the US hasn’t voiced the kinds of security concerns over Xi’s global grid push that it has over Huawei, that’s probably because China has struggled to get its ambitions off the ground. Of the 125,000 km of high-voltage grids Geidco mapped in a 2019 report, very little has been built. The first stage of a Pakistan-China link, due to go live later this year, marks an exception.


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The Northeast Asia supergrid, for now, remains a desktop project. The Asian Development Bank’s seven-nation Greater Mekong Subregion Power Trading and Interconnection initiative has made slow progress since its launch in 1992.

After some heavy handed selling of supergrids in speeches and conferences Liu Zhenya has likened them to intercontinental ballistic missiles and boasted that China would set global technical standards – officials in Beijing have begun to soft-pedal some of the more controversial proposals.

One example: to create a centralized international body that would direct and oversee the operation of a global grid. A spokeswoman for Geidco declined to discuss the supergrid plans. Instead, she provided Liu’s speeches and reports describing the potential for a Global Energy Interconnection to end the climate crisis and produce a “global win-win.”

Ohbayashi says Japanese politicians still don’t dare even hint at the possibility that they might volunteer to hook the nation’s energy system to China’s. A Japanese energy plan released in April would double power flows between the nation’s still siloed domestic grids – a potential start – but said little about connecting to other countries.


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If these supergrids don’t get built, it will be because their time has both come and gone. Not only are they expensive, politically difficult, and unpopular – they have to cross a lot of backyards – their focus on mega-power installations seems outdated to some. Distributed microgeneration as close to home as your rooftop, battery storage, and transportable hydrogen all offer competing solutions to the delivery problems supergrids aim to solve.

In China’s vision of an energy internet, these aren’t mutually exclusive. Jan Vande Putte, a Brussels-based energy analyst for the environmental lobby Greenpeace, concurs.

“All this will be needed, but none will be enough,” he says. “To integrate such large amounts of renewables into the grid, you can talk about battery storage and other things, but grid transfer is still the most cost-effective and efficient,” he says, adding that the EU and others are likely to move incrementally, with recognizable supergrids emerging only after 2030.

Gerhard Salge is chief technology officer at Hitachi ABB Power Grids, formed last year when Japan’s Hitachi bought 80% of Swedish-Swiss ABB’s power grid business for $6.85 billion. He has no doubt that demand for the multi-thousand ton AC/DC converters his company builds will grow.


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“We need to go massive into wind, into the best solar locations, and also the best onshore wind – to the desert in Chile or to Northern Russia in the Arctic wind zones, where you have permanent wind blowing all year,” Salge says. In the UK ABB Hitachi is building a cable from Yorkshire to a unit of the Dogger Bank offshore wind farm.

Other mega-projects may take a while, though. For Mongolia, becoming the Saudi Arabia of wind and solar power might seem an irresistible opportunity. The government is publicly in favour, but after it moved the regulatory goal posts on early investors, efforts to build more renewable generation there have stalled, says Aida Sitdikova, director for energy and natural resources in Russia, the Caucasus, and Central Asia at the European Bank for Reconstruction and Development, which has co-invested in several Mongolian wind and solar projects.

“For a supergrid to take off, the country has to show that it can build renewables, can attract investment, and has the appropriate regulatory environment,” says Sitdikova.

Mongolia has yet to meet those tests. Last year, it did agree to develop new power generation capacity for export to China – but by building a new coal fired plant.


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More cross-border networks of high-voltage power lines are likely to get built, despite all the obstacles and competition from new technologies, says Josh Novacheck, a researcher in the grid systems group of the US Department of Energy’s National Renewable Energy Laboratory. Yet that’s more likely to happen along the incremental, organic model that historically was followed by the US electricity grids, he says, rather than any Chinese long march.

“I definitely see that path forward happening,” says Novacheck, “instead of any large centralized plan of: ‘Let’s globalize this.’”

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