US company plans reactor by mid-2030s despite expert skepticism
A nuclear fusion company building reactors in the United States says it could have a plant up and running in Australia by the middle of the next decade, even though there are no commercial fusion power plants anywhere in the world.
Fusion reactors attempt to replicate conditions inside the sun by using extreme heat and strong magnetic fields to cause atoms to fuse together, releasing large amounts of clean energy. This energy is designed to be stored in a donut-shaped magnetic device called a stellarator. In theory, they represent the ultimate source of cheap and clean energy. There has been no demonstration of them working at commercial scale yet in practice.
Type One Energy is constructing a building Stellarator testbed in Tennesseewhere is it signed a letter of intent with the local energy authority to build a 350 MW commercial fusion reactor. He says the fusion technology is mature and ready for use, and eventually the cost per facility could be as low as $US2 billion ($3 billion).
Australian fusion experts disagree. There are no commercial nuclear fusion reactors in the world, and just an experiment It successfully produced more power than it consumed, but it looked more like an explosion than a reactor. Major scientific and technical obstacles remain; CSIRO I won’t even consider fusion In energy modelling.
But that hasn’t dampened the excitement of entrepreneurs and venture capital funds. Global private investment in fusion We have now exceeded 10 billion dollars, The social media and cryptocurrency company, the latest to invest in U.S. President Donald Trump, announced Friday that it is merging with a nuclear fusion company.
“We aim to break new ground in this field” [US] Charlie Baynes-Reid, chief financial officer of Type One Energy, said: “We would like nothing more than a second or third power plant being built in Australia.
“We are extremely confident that what we are talking about here is not whether this will work, but how efficient these power plants will be.”
A star in a bottle
Nuclear fission reactions power conventional nuclear reactors: enriched uranium is bombarded with neutrons, causing atoms to split and releasing heat. The heat is used to boil the steam and spin the turbines, while the splitting atoms fuel a chain reaction that keeps the reactor running.
Nuclear fusion is different. Instead of splitting the atom, two hydrogen atoms come together to form a helium atom and energy is released. Our sun also receives power from the same principle; Its immense gravity and extremely high temperatures convert the hydrogen deep in its core into helium.
Fusion reactions release much more energy than fission. There are no greenhouse gases. To quote the International Atomic Energy Agency: “It could provide virtually unlimited clean, safe and affordable energy to meet the world’s demand.”
Achieving nuclear fusion is a solved problem in itself. In 2018, 12-year-old Jackson Oswalt did the following: in a homemade reactor in the bedroom.
The real challenge can be boiled down to a simple statement from John Howard, a retired professor who oversaw the Australian National University’s experimental fusion reactor for years: “You keep a star in a magnetic bottle.”
This is as difficult as it seems. The fusion reaction must be continuous, stable and reliable to provide baseload power.
Fusion scientists start with plasma; Super hot rotating gas consisting of atoms stripped of electrons. Plasma is sensitive to magnetic fields, so large magnets are used to hold it and rotate it into the reactor chamber.
Type One proposes building stellarizers that resemble twisted hollow donuts wrapped in coils of superconducting magnets. The magnets crush the gas together and the gas is then heated to the point where the fusion reaction is ignited.
The technical challenges are huge. Star stars need to survive temperatures exceeding one hundred million degrees KelvinWhile keeping the superconducting magnets surrounding the chamber below zero.
It can work. German W7-X star player breaks record this year longest controlled fusion reaction. Baynes-Reid says all that is needed now is to upgrade the German model to grid size. One Energy proposes to repurpose old, shuttered coal plants that already have grid connections.
“The basic science and technology has been proven. Now we can take this basic science and technology and optimize it for a functional power plant,” Baynes-Reid said.
Other scientists are less optimistic. W7-X broke the record by running 47 seconds in total.
“I hate to be the naysayer. Great progress has been made. But there are a few pretty tricky technical challenges that have yet to be solved,” Howard said.
Two stand out. First, for fusion to work, engineers need to prove tritium breeding.
Fusion reactors are powered by the fusion of two special types of hydrogen, deuterium and tritium. Deuterium can be easily extracted from water, but tritium is rare and radioactive.
A commercial fusion reactor needs to produce its own tritium as a byproduct of the reaction, which can then be reused as fuel. This technology is theoretically possible, but scientists have not yet proven that it works.
Second, neutrons created as part of the reaction can disrupt components of the reaction chamber. Can you replace them quickly and economically while still providing a reliable power source?
“Their prospectus is pretty optimistic. I’d like to say it’s based on proven success, but that’s not quite the case yet,” Howard said. “If I had the money, would I invest in this? Probably not.”
Then there is the issue of time scale. Type One believes an operational plant could be built in Tennessee by 2034 to replace coal plants that are scheduled to reach the end of their operating lives in the next decade.
Australia has committed to reducing emissions by 62 to 70 per cent of 2005 levels by 2035; This is a dramatic increase in the rate of emissions reductions, probably requires 95 percent of all electricity generation It will be renewable within ten years.
ITER, the world’s largest and most powerful experimental fusion reactor, Designed in 1985The project, which has been under construction since 2013, is expected to cost 66 billion dollars.
It is designed to achieve break-even and will test tritium breeding. However, it will not be able to reach the first plasma and connect to the grid until 2034 at the earliest.
Fusion researcher Dr. from Griffith University. “That’s what I believe. But we have a problem on our hands. We’re cooking ourselves alive and setting the conditions for crazy rainfalls, floods and sea level rise. First, deal with this with existing and proven technology,” said Nathan Garland.
“I believe in that, but I may not be as aggressive on the time scale as the private sector.”
The Examine newsletter explains and analyzes science with a rigorous focus on evidence. Sign up to receive it every week.
