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Bill Gates and Warren Buffett want to build a new kind of nuclear reactor to generate electricity. Why? Because the wind doesn’t always blow and the sun doesn’t always shine. They intend to plunk their new toy down in the state of Wyoming on the former site of a coal-fired generating plant.

“This is our fastest and clearest course to becoming carbon negative,” says Wyoming’s governor Mark Gordon. “Nuclear power is clearly a part of my all-of-the-above strategy for energy.” Wyoming is the top coal producing state in America.

According to The Guardian, the new facility will be a joint venture between TerraPower, founded by Gates 15 years ago, and PacifiCorp, a Berkshire Hathaway-owned utility that serves customers in Wyoming, Idaho, Utah, California, Oregon, and Washington.

Small advanced reactors, which run on different fuels than traditional reactors, are regarded by some as a critical carbon-free technology that can supplement intermittent power sources like wind and solar as states strive to cut emissions that cause climate change. “We think Natrium will be a game-changer for the energy industry,” Gates told a media conference in Cheyenne, Wyoming this week.

PacifiCorp service area. Image credit: SEC

345 Megawatts

The Guardian says the new generating station will produce 345 megawatts of electricity, but the output can be boosted by a molten salt energy storage component to 500 megawatts. The primary feature of the so-called Natrium technology is that it uses sodium to cool the reactor instead of water. Natrium is the Latin word for sodium, which is why its symbol on the periodic table of elements is Na.

Chris Levesque, TerraPower CEO, told the press this week the demonstration plant will cost about $1 billion and will take about seven years to build. “We need this kind of clean energy on the grid in the 2030s,” he told reporters. Actually, Chris, we need clean energy on the grid now, not 7+ years from now. A billion dollars would buy more than 500 MW of power and have it online, together with grid storage batteries, in a lot less time. Why wait?

Natrium Technology

I am not a nuclear engineer nor am I a rocket scientist, so I have to rely on Wikipedia to inform me about some things (I contribute $5 a month to support Wikipedia and encourage you to do the same).

Here is what I found out:

Image credit: Wikimedia/Public Domain

Advantages

The primary advantage of liquid metal coolants, such as liquid sodium, is that metal atoms are weak neutron moderators. Water is a much stronger neutron moderator because the hydrogen atoms found in water are much lighter than metal atoms, and therefore neutrons lose more energy in collisions with hydrogen atoms.

This makes it difficult to use water as a coolant for a fast reactor because the water tends to slow (moderate) the fast neutrons into thermal neutrons (though concepts for reduced moderation water reactors exist).

Another advantage of liquid sodium coolant is that sodium melts at 371K and boils / vaporizes at 1156K, a total temperature range of 785K between solid / frozen and gas / vapor states. By comparison, the liquid temperature range of water (between ice and gas) is just 100K at normal, sea-level atmospheric pressure conditions. Despite sodium’s low specific heat (as compared to water), this enables the absorption of significant heat in the liquid phase, even allowing for safety margins. Moreover, the high thermal conductivity of sodium effectively creates a reservoir of heat capacity which provides thermal inertia against overheating.

Sodium also need not be pressurized since its boiling point is much higher than the reactor’s operating temperature, and sodium does not corrode steel reactor parts.[2] The high temperatures reached by the coolant (the Phénix reactor outlet temperature was 560° C) permit a higher thermodynamic efficiency than in water-cooled reactors. The molten sodium, being electrically conductive, can also be pumped by electromagnetic pumps.

Disadvantages

A disadvantage of sodium is its chemical reactivity, which requires special precautions to prevent and suppress fires. If sodium comes into contact with water it reacts to produce sodium hydroxide and hydrogen, and the hydrogen burns when in contact with air.

This was the case at the Monju Nuclear Power Plant in a 1995 accident. In addition, neutron capture causes it to become radioactive; however, activated sodium has a half-life of only 15 hours. Another problem is sodium leaks which are regarded by a critic of fast reactors, M.V. Ramana, as “pretty much impossible to prevent.”

Fuel Used

Wikipedia adds that a natrium facility that generates less than 500 MW of electricity uses “uranium-plutonium-minor-actinide-zirconium metal alloy fuel, which is supported by a fuel cycle based on pyrometallurgical reprocessing in facilities integrated with the reactor.” I don’t know about you, but the words “uranium” and “plutonium” don’t sound like “different fuels compared to traditional nuclear reactors.”

The Guardian points out that nuclear power experts have warned that advanced reactors could have higher risks than conventional ones. Fuel for many advanced reactors would have to be enriched at a much higher rate than conventional fuel, meaning the fuel supply chain could be an attractive target for militants looking to create a crude nuclear weapon. And don’t even be concerned about Russian hackers. We know those malefactors only like to interrupt gasoline pipelines and beef processing plants. Pooty Poot and his henchmen would never stoop so low as to hack a nuclear power plant…would they?

People always rush to criticize Tesla for selling emissions credits, but no one wants to talk about the $80 million the US Department of Energy has already invested in TerraPower with millions more coming in the future. No one would expect Bill Gates and Warren Buffett — two of the richest white men in history — to foot the bill for their boondoggles all by themselves, would they?

All Of The Above

The key to understanding this story is found in Governor Gordon’s use of the words “all of the above.” That’s free market speak for “We’re happy to have a piddly little 350 MW facility of over here, just so long as we can continue supporting coal- and gas-powered generating plants that churn out hundreds of gigawatts over there.” In other words, it’s a smokescreen designed to allow fossil fuel interests to kick the can down the road a little further and add some greenwashing to their corporate portfolios at the same time.

Being rich does not necessarily make a person all that smart. America needs more nuclear power like a fish needs a bicycle. People in Wyoming may be fooled by this blather, but CleanTechnica readers aren’t taking the bait. Natrium was probably selected as the name of thus new nuclear technology because it sounds a little like “nature” or “natural.” That’s a great marketing ploy, but we’re not buying it. Frankly, the Bill and Warren show is more than a little disappointing.


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E-quipment highlight: Komatsu PC20E-6 electric mini excavator

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E-quipment highlight: Komatsu PC20E-6 electric mini excavator

Japanese equipment giant Komatsu has added a not-so-giant electric excavator to its growing lineup of battery-powered construction equipment. The new Komatsu PC20E-6 electric mini excavator promises a full day of work from a single charge.

Komatsu says the design of its latest mini excavator was informed by data sourced from more than 40,000 working days of comparably-sized diesel excavators. The company found that, in 90% of its global customers’ mini excavator deployments, these vehicles are in active use for less than 3.5 hours per day.

“This defined the target for the required, reliable working time with the excavator,” reads the Komatsu web copy. “This result makes it possible for Komatsu to offer an attractively priced machine with a performance that exactly matches the requirements.”

Keeping costs down are relatively conservative specs. Komatsu chose to power the PC20E-6 with a 23.2 kWh battery pack sending electrons to an 11 kW (~15 hp), high-torque electric motors. Not exactly super impressive on paper, but the machine has an operating weight of 2,190 kg and enough juice for up to four (4) hours of continuous operation.

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More than enough, in other words, to have completed 90% of of those 40,000 work days the company analyzed.

Getting it done


PC20E-6 electric mini excavator; via Komatsu.

If, for some reason, that four hours’ runtime isn’t enough, an on-board charging option for 230V and 3kW charging power compatible with various plug adapters is standard, with an external DC quick charger for 400V and 12 kW charging as optional. In either case, it won’t be long before the machine is back at work.

To help the later adopters sleep well about their battery-powered investments, the PC20E-6 ships with Komatsu’s E-Support maintenance program, which includes free scheduled maintenance by a Komatsu-trained technician, a 3 year/2,000 hour warranty on the machine, plus a 5 year/10,000 hour warranty on the electric driveline. The company says the battery should last 10 years.

“The Komatsu E-Support customer program is included free of charge with every market-ready electric mini excavator and offers exclusive machine support,” said Emanuele Viel, Group Manager Utility at Komatsu Europe. “The bottom line is that the risk for the end customer is significantly reduced, especially when it comes to exploring the electrification advances in the industry.”

Komatsu hasn’t released official pricing quite yet, but has revealed that the P20E-6 will begin series production this October.

SOURCE | IMAGES: Komatsu.


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Tesla unexpectedly ends contract at Giga Texas, letting go 82 people

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Tesla unexpectedly ends contract at Giga Texas, letting go 82 people

Tesla has unexpectedly terminated a contractor’s contract at Gigafactory Texas, resulting in the layoff of 82 workers who were supporting the automaker’s production at the giant factory in Austin.

MPW Industrial Services Inc., an Ohio-based industrial service provider specializing in cleaning and facility management, has issued a new WARN notice, confirming that it will lay off 82 workers in Texas due to Tesla unexpectedly ending its contract with the company.

Here are the details from the WARN notice:

  • State / agency: Texas Workforce Commission (TWC).
  • Notice date: August 27, 2025.
  • Employees affected: 82
  • Likely effective date: September 1, 2025
  • Context from the filing/letter: layoffs tied to an unexpected termination of a major customer contract (Tesla—Gigafactory Texas, 1 Tesla Road); positions include 61 technicians, 7 team leads, 7 supervisors, 7 managers; no bumping rights; workers not union-represented.

In April 2024, Tesla initiated waves of layoffs at the plant, resulting in the dismissal of more than 2,000 employees in Austin, Texas.

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Since then, Tesla’s sales have been in a steady decline. While the automaker is expected to have a strong quarter in the US in Q3 due to the end of the tax credit, sales are expected to decline further in Q4 and the first half of 2026.

Many industry watchers have expected Tesla to initiate further layoffs due to the situation.

Electrek’s Take

We may be seeing the beginnings of a new wave of layoffs at Tesla, as the automaker typically starts with contractors.

To be fair, Tesla could also potentially end the contract unexpectedly for other reasons, but the timing does align with the need to cut costs and staff ahead of an inevitable downturn in US EV sales.

I think it’s inevitable that we start seeing some layoffs. I think Tesla will have to slow down production in the US to avoid creating an oversupply, especially in Q4-Q1.

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After e-bike fury, suburban pearl-clutchers set their ire on golf carts

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After e-bike fury, suburban pearl-clutchers set their ire on golf carts

First, it was e-bikes, offering an efficient, effective, and low-cost way for teens and just about everyone to zip around town, yet drawing the temper of suburban traditionalists. Now golf carts are the new public enemy number one in suburbia, at least if you ask the growing number of online groups where residents complain about these small electric vehicles “clogging” their streets.

But beyond the hand-wringing, golf carts and their more sophisticated cousins known as Neighborhood Electric Vehicles (NEVs) or Low Speed Vehicles (LSVs), are quietly becoming a popular alternative to cars for short trips around US cities and suburbs.

While most people still associate golf carts with retirement communities in Florida or slow rides across 18 holes, street-legal versions have been around for the last few decades.

But these aren’t your grandpa’s bare-bones carts, complete with a golf pencil clip. Many now come with DOT seat belts, lights, turn signals, mirrors, backup cameras, and speed limiters that allow them to operate legally on roads up to 35 mph, as long as they meet all the federal requirements for Low-Speed Vehicles (LSVs).

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That means such vehicles are legally allowed to operate like cars, trucks, bicycles, or motorcycles on the vast majority of residential streets and a surprising portion of urban grids. In other words, for grabbing groceries, school drop-offs, or cruising to a friend’s house, they’re a practical, cheaper, and far greener substitute for firing up a 5,000-pound SUV.

The Club Car Cru adds extra luxury to the concept of an LSV

Golf carts have been slowly taking off for years, but the pandemic accelerated the trend. Sales of golf carts and LSVs spiked as families looked for safe, outdoor transportation and an easy way to get around their neighborhoods. Now, in cities all over the country, the sight of parents driving their kids to school or running errands in a cart is increasingly common. In some towns, petitions have even popped up with hundreds of residents asking for local ordinances to legalize them on more streets, according to the Daily Mail.

Of course, not everyone is thrilled. There’s growing backlash against the increase in golf carts on streets, with many residents calling them a “plague” and complaining that they’re taking up space on the roads, in parking lots, or creating unsafe conditions. While rare, there have been serious accidents too, with a handful of tragic cases highlighting the dangers of mixing small, lightweight carts with full-size vehicles. Critics argue that carts lack the crash protection of cars and don’t always fall under homeowners’ insurance policies if an accident happens.

But for every critic, there’s a supporter pointing out that golf carts take cars off the road, save money on fuel, and are no more dangerous than scooters or e-bikes – modes of transport that already share the streets. And major golf cart makers have been happy to respond to the demand with boosted sales and new models. Companies like E-Z-GO, Club Car, WAEV, Kandi, and others are all rushing new models to the market as more suburban commuters discover that their next electric vehicle might just cost a fraction of what they thought it would – and come with a better breeze, too.

The GEM microcars are classic LSVs that have brought smiles to families’ faces for decades

Electrek’s Take

If I didn’t know any better, I’d say it’s like the Karens are just following me around to poo-poo on any alternative vehicle I happen to drive that week. They’ve hit all my favorites. Pretty soon, they’ll be coming for my electric tractors, too!

But seriously, this feels like déjà vu. The same arguments we’ve heard for years against e-bikes are now being recycled against golf carts: too unsafe, too disruptive, too “different” from the car-centric status quo.

But the reality is, again, quite the same as e-bikes. These are small electric vehicles that make a ton of sense and are totally street legal, at least when they’re built correctly to conform to the proper laws.

They come with a lot of the same benefits, too. They’re cheap to operate, easy to park, perfect for short trips, and they prevent larger cars from needlessly clogging residential streets. Will they ruffle feathers among the kind of folks who have had one too many frisbees land in their yard? Perhaps. But much like e-bikes, their popularity is only going one direction – up.

I leave you with a few images of perhaps my favorite of all, the Kandi Mini. The nay-sayers can pull it from my cold, dead, golf

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