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If there’s one climate policy you’re likely to hear about in the debt ceiling deal, it’s the Mountain Valley Pipeline.
The 304-mile pipeline, which will link West Virginia’s booming gas fields to the East Coast and Texas, essentially received automatic approval under the bipartisan deal. The bill compels federal agencies to approve the pipeline and then shields those permits from judicial review, all but guaranteeing the project’s eventual completion.
If nothing else, the deal brings the saga over the Mountain Valley Pipeline to a close almost a year after it began: The White House initially agreed to support the project last year in exchange for Senator Joe Manchin of West Virginia’s support for Biden’s climate law. But neither Manchin nor Biden could get a bill containing the pipeline through Congress last year as part of a larger package of permitting reforms. Manchin persevered, and the pipeline wriggled into the deal over the weekend thanks to House Republicans and oil-and-gas lobbyists. Manchin, it seems, finally has his pipeline.
The project isn’t the most important climate item in the deal. That distinction has to go to the deal’s preservation of the Inflation Reduction Act, which will ensure hundreds of billions of dollars go to clean energy and infrastructure over the next decade. Nor is it the deal’s worst blow to the climate: As I wrote yesterday, Democrats’ failure to secure any power-grid reform takes that title.
Yet the Mountain Valley Pipeline, or MVP, is the item that environmental groups have focused on the most. “Allowing this deal to advance sets a dangerous precedent,” Ben Jealous, the Sierra Club’s executive director, said in a statement. “We can pay America’s bills without undermining bedrock environmental protections or fast tracking the fracked gas Mountain Valley Pipeline.”
So I was curious: How big a deal is the MVP? When completed, it will transmit 2 billion cubic feet of natural gas a day: What does that actually mean for the country’s natural gas transmission?
Well, here’s a potentially helpful chart:

This is the Energy Information Administration’s chart of new natural-gas pipeline capacity from 1995 to 2022 with my addition. I’ve added the MVP’s capacity at the right. As you can see, the MVP alone will add more pipeline capacity than the entire U.S. added last year — but that’s partially because the country added much less capacity in 2022 than it has in any year since records began in 1995.
I’ll be honest that the chart helps me think more clearly about the project, but not in a way that’s easy to describe. The Mountain Valley Pipeline is a medium-largeish pipeline — big enough to single-handedly expand the country’s ability to move natural gas, but not so big that it will change the fundamental trend that fewer new pipelines are getting built every year.
The MVP’s most important effect may not be its size, but its strategic location: By connecting the productive Utica and Marcellus shale fields in Appalachia to the Transcontinental pipeline, a massive backbone conduit that links New Jersey to the Rio Grande Valley, it will make it easier for cheap natural gas to reach the population centers — and export terminals — of the Eastern Seaboard and Gulf Coast. That will, in turn, spur a modest increase in natural-gas drilling, which could increase American emissions by roughly 6 to 16 million metric tons a year, according to an estimate from The Washington Post.
The Inflation Reduction Act, by comparison, will eliminate roughly 660 million tons a year by 2030. So preserving the IRA is worth the carbon cost of this pipeline — but it would be better, of course, not to have to make such a choice at all.
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The spinoff of Lawrence Livermore National Lab has a new 10-point plan to get onto the grid by the 2030s.
One of fusion energy’s newest startups, Inertia Enterprises, is betting that the fastest route to commercial fusion runs through one of the field’s oldest ideas. The company, which raised a $450 million Series A earlier this year, plans to build a power plant based on the laser-driven fusion system pioneered at Lawrence Livermore National Laboratory’s — the only tech yet to have produced more energy from a fusion reaction than it took to initiate it. Now, Inertia has shared its commercialization roadmap exclusively with Heatmap, detailing the 10 near-term capabilities it must demonstrate before this landmark experiment can become a grid-scale power plant by the mid-2030s.
The roadmap offers a route from the national lab’s impressive but commercially impractical fusion demonstrations to an economical power plant capable of producing electricity for the grid. At its core are a set of milestones — mostly aimed at developing cheap, mass-manufacturable components — that Inertia says it must clear before those individual systems can be integrated into a working plant. This road is not necessarily linear, however, as various teams will likely be working on many of these goals simultaneously.
At least the physics of Inertia’s approach are already proven, the startup’s CEO Jeff Lawson told me, pointing to the fusion experiments at Lawrence Livermore’s National Ignition Facility as a proof-of-concept. The lab’s demonstration of net energy gain caps more than six decades and $30 billion (in 2026 dollars) of U.S. fusion research. The remaining challenges, he argued, are all engineering-related, requiring “elbow grease, hard work, and smart people” rather than breakthroughs in fusion science.
"It seems to us like a startup or a commercial company of any variety should be focused on commercializing a proven scientific result, as opposed to actually trying to demonstrate the basic science to begin with," Lawson told me. Basic science, he argues, is better left to national labs and universities, where researchers can pursue "unbounded problems" that don’t align with the expectations and timelines of venture-backed startups.
Indeed, no fusion startup has yet achieved scientific breakeven, the milestone Lawrence Livermore first hit in 2022, and has since repeated numerous times. But leading players such as Commonwealth Fusion Systems and Helion Energy maintain that it’s only a matter of time before they validate the physics behind their own reactor designs, which they claim will be highly cost-competitive.
Lawson, on the other hand, readily acknowledged that Lawrence Livermore’s tech is uneconomical in its current form. His bet is simply that the more predictable path to a commercial reactor is to drive down the cost of the lab’s validated fusion approach, known as inertial confinement. This system relies on high-powered lasers firing at a millimeter-scale pellet of fusion fuel, compressing it to extreme temperatures and pressures until the atoms fuse. Today, the National Ignition Facility makes each individual fusion target by hand, a workable solution given that it only uses about a dozen per year.
That production model, however, isn’t remotely plausible for a grid-scale power plant. Because each fusion reaction lasts just a fraction of a billionth of a second, a commercial facility must fire its lasers at a fresh target about 10 times per second to generate continuous electricity — requiring the production of hundreds of millions of targets each year.
Scaling production to roughly a million pellets per day and making them inexpensive enough for commercial operation without compromising the strength or precision required for fusion ignition is central to Inertia’s roadmap. That includes goals five, seven, eight and nine — industrializing the manufacturing of the carbon shells that hold the fusion fuel, making the thin films that hold those carbon shells both durable and cheap, scaling up and automating fusion target assembly, and speeding up how fast targets are filled with the requisite deuterium-tritium fuel.
The other central focus of the roadmap is the laser system, which will ultimately consist of 1,000 individual units operating in concert to compress and heat the fusion fuel. Key priorities include reducing the system’s cost (goal two), dramatically increasing its firing cadence (goal three), and bolstering its durability to withstand high-intensity operations (goal four). Goal six also complements these efforts, calling for the development of a control system capable of tracking moving fusion targets to precisely align each laser shot.
Goals one and 10 bookend the journey with some broader milestones. The first focuses on increasing the fusion target’s energy gain — the ratio of fusion energy produced to laser energy delivered — to more than 25 times ignition. Today, the National Ignition Facility’s best-performing laser shot has yielded a gain of just over four times what it took to start the reaction. Goal 10 then zooms out to the ultimate objective: integrating all these technologies into a commercially viable power plant that can deliver either electricity or industrial heat to end customers.
To reach that point, Inertia has embarked on an industrial engineering hiring spree, recruiting folks with experience taking complex hardware systems from prototype to mass production, “not unlike the processes that are used in the semiconductor or consumer electronics world,” Lawson explained. The company has been making progress on its component development goals since the beginning of the year, he told me, and expects to announce the successful demonstration of a few of these milestones in the coming months. Lawson ultimately expects Inertia to complete the core components of its laser and target manufacturing systems by the middle of next year.
The team will spend the next two to three years integrating these individual pieces into two fully operational subsystems, a prototype laser system and a target manufacturing line. Around 2030, the company will begin combining those subsystems into a first-of-a-kind fusion power plant, which will also serve as the proving ground for the target chamber, tritium fuel breeding system, and power conversion system that turns fusion heat into electricity. By the middle of the next decade, Inertia aims to be generating power from this first plant, setting the stage for the company to build and connect additional grid-scale commercial power plants.
There are plenty of engineering trade-offs that the company will have to solve for. Take the decision around how to size the target chamber, for example. “If you make it bigger, your walls have an easier time and survive longer, but it’s more expensive. If you make it smaller, your walls have a tougher time because they’re closer to all the heat and energy that the fusion reaction is creating, but now your power plant costs less to build.”
But to Lawson, this represents exactly the type of problem Inertia was built to solve: complex engineering issues that come to the fore once scientists have demonstrated the fundamental physics are sound. He thinks other fusion companies may someday reach this stage, as well — though he’s unwilling to hazard a guess on exactly what approach or startup is best positioned to do so.
“There have been generations of scientists who’ve made their predictions about fusion energy and gotten it wrong,” he told me. “I’m not going to pretend to be smarter than them. All I’m here to say is, just knowing that one did work, we can commercialize it.”