I have spell-checked and fixed the grammar in the document's content. I've focused on corrections that maintain the original meaning and structure of the text.-----The last few weeks have seen numerous announcements by U.S. fusion energy companies.

First, let’s briefly explain fusion. With fission, you take a heavy and unstable nucleus and split it into two smaller nuclei, releasing energy and creating a chain reaction.

With fusion, you cause two light nuclei (usually hydrogen isotopes) to collide and merge into a heavier nucleus (such as helium), releasing energy. The sun is an enormous fusion reactor.

For commercial fusion, you need three things: 1) temperatures high enough (around 50 to 150 million °C) so nuclei move fast and fuse frequently; 2) sufficient density creating more opportunities for nuclei to collide, fuse, and release energy; 3) the ability to confine the reaction, keeping the plasma dense and hot enough to yield a net energy output.

Plasma itself is a state of matter in which a gas is highly energized so its atoms have lost one or more electrons, creating a mix of free electrons and ions.

Confinement of plasma can be achieved with the inertia of a compressed pellet or by using magnetic fields.

The pellet confinement approach - inertial confinement fusion, or ICF – is achieved by compressing a small fuel pellet (typically hydrogen) rapidly and with high density so it fuses before it can break apart.

With magnetic confinement, two main technologies exist: 1) tokomaks – donut shaped devices combining magnets with electric currents in plasma to construct a sort of magnetic cage; and 2) stellerators – machines employing magnetic coils that yield twisted magnetic fields requiring less currents in the plasma. Companies are pursuing approaches along these two main lines, with the majority using the magnetic approach.

The major recent technical achievement was Helion’s announcement that it had achieved plasma temperatures of close to 150 million degrees C.

On the commercial front, Type One Energy and the Tennessee Valley Authority are advancing licensing and construction plans for a 350 MW stellerator fusion plant, with groundbreaking as early as 2028.

Regarding licensing, Thea Energy received the first Department of Energy certification for its pilot stellerator design.

In financing, Avalanche Energy received $29 million in new investor funding, following significant breakthroughs in plasma physics, to support licensing, commercial-scale operations, and a test program. Avalanche is developing a tiny fusion reactor between 1 and 100 kW, “small enough to sit on your desk.”

Inertia Enterprises also raised almost $450 million to construct powerful lasers, as well as a power pla

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Let’s explore the complexity associated with keeping the lights, using New England as an example. The region is a bit of an outlier because of its proverbial end-of-the-pipeline location. Most days, its two pipelines are sufficient to heat homes and generate power. But late January to early February was unusually cold and there was not enough gas for both.

We’ll look at both energy and capacity issues. Capacity is the instantaneous amount of electricity produced or consumed. Energy is a function of capacity times the duration.

The hottest and coldest days are the ones in which we stress the grid the most – because of heating and cooling demands.

Annual grid peaks typically occur in summer, around 5:00 or 6:00 PM. So grids need enough generation to meet the peak demand, plus a back-up reserve margin, in case we lose a big power plant or transmission line.

Until recently, ISO-NE only paid attention to summer peaks, when the system maxed out. But recently, it began to shift its attention to the winter as well. First, because new loads, especially EVs and heat pumps, have higher winter demand. Second, there’s not enough gas to go around.

Fortunately, from a reliability perspective, the region’s dual fuel turbines can burn fuel oil or kerosene, and even jet fuel. So the focus shifts to energy, because the amount of stored liquid fuels is limited, though it can be replenished – especially if weather cooperates. During the frigid cold snap in 2017/2018, New England started with 5 million barrels of oil and ended with only one, in one case burning a million gallons in a single day.

During the extreme cold this January, fuel oil was the leading source of generation for several days, constituting over one-third of operating generation.

One new resource just commissioned was the 1200 MW New England Clean Energy Connect (NECEC) transmission line, bringing hydropower from Quebec to Massachusetts with a contract for an annual 9,555,000 MWh. The NECEC line was expected to help address winter capacity and energy issues.

But last week, no power was flowing into New England over that line on the coldest days. On the frigid Sunday before the storm, power flowed for only a single hour, with the line operating at about half its capacity. The following day, at around 6:00 in the evening, electricity started flowing again at about 25% - this despite penalties for non-delivery.

However, the contract does provide a measure of relief to those oil supplies in the long run. Today, January 3rd, the temps are in the mid-20s. The region continues to burn oil, at 23%.

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🎙️ About Energy Future: Powering Tomorrow’s Cleaner World

Hosted by Peter Kelly-Detwiler, Energy Future explores the trends, technologies, and policies driving the global clean-energy transition — from the U.S. grid and renewable markets to advanced nuclear, fusion, and EV innovation.

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The "Power Game" is shifting. Here’s what you need to know from this week’s Energy Story:

• Courts 3, White House 0: Three different federal judges have now lifted the "stop-work" orders on massive offshore wind projects, ruling that the administration failed to prove any urgent "national security" risk.
• A "Social Good" vs. A Commodity: PJM took the rare step of siding against the administration, arguing that stopping these projects causes "irreparable harm" to the reliability of the grid for 67 million people.
• The 15-Year Hook: A new bipartisan proposal suggests an "Emergency Capacity Auction" specifically for data centers. It would offer developers 15-year guaranteed revenue—a massive shift from the current (and often "useless") 1-year auction cycles.
• The "Parallel Grid" Risk: We explore the danger of creating two markets: a highly lucrative one for AI developers and a "starved" one for existing ratepayers.
• The 2028 Bottleneck: Even with guaranteed money, the world is running out of hardware. GE reports gas turbine availability is limited until late 2028, and new transmission capacity is essentially non-existent.

Support the show

🎙️ About Energy Future: Powering Tomorrow’s Cleaner World

Hosted by Peter Kelly-Detwiler, Energy Future explores the trends, technologies, and policies driving the global clean-energy transition — from the U.S. grid and renewable markets to advanced nuclear, fusion, and EV innovation.

💡 Stay Connected
Subscribe wherever you listen — including Spotify, Apple Podcasts, Amazon Music, and YouTube.

🌎 Learn More
Visit peterkellydetwiler.com
for weekly market insights, in-depth articles, and energy analysis.