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Will the rise of machine learning and artificial intelligence break the climate system? In recent months, utilities and tech companies have argued that soaring use of AI will overwhelm electricity markets. Is that true — or is it a sales pitch meant to build more gas plants? And how much electricity do data centers and AI use today?
In this week’s episode, Rob and Jesse talk to Jonathan Koomey, an independent researcher, lecturer, and entrepreneur who studies the energy impacts of the internet and information technology. We discuss why AI may not break the electricity system and the long history of anxiety over computing’s energy use. Shift Key is hosted by Robinson Meyer, executive editor of Heatmap, and Jesse Jenkins, a Princeton professor of energy systems engineering.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Here is an excerpt from our conversation:
Robinson Meyer: Before we go any further — and I think you just hinted at your answer, here, but I want to tackle it directly — which is that I think people look at the hockey stick graphs for AI use, and they look at current energy use for AI, and they look at load growth data coming from the utilities, and they go, “Oh my gosh, AI is going to absolutely overrun our energy system. It’s going to cause emissions to shoot up,” because again, this is just extrapolating from what’s recent.
But of course, part of the whole AI mythos is like, once it starts, you can’t stop it. There is a story out there that, frankly, you see as much from folks who are worried about the climate as you do from AI boosters, which is that very soon, we'’e going to be using a huge amount of energy on AI. And I want to ask you this directly: Should we be worried about AI, number one, overrunning the energy system? Or number two, AI causing a massive spike in carbon emissions that dooms us to, let's say, pass 2.5C that uses up the rest of our carbon budget? Is that something you're worried about? And just how do you think about this?
Jonathan Koomey: Everyone needs to calm the heck down. So we talked about the original baseline, right? So the baseline, data centers are 1% of the world's electricity. And maybe AI now is 0.1%, right? For Google, it’s 0.15%, whatever. But 10% of the 1% is AI.
So let’s say that doubles — let’s say that triples in the next few years, or even goes up fivefold. That gets to about half a percent. So I think it will pale in comparison to the other growth drivers that Jesse was talking about in electrification. Because if you think about light vehicles, if you electrified all light vehicles in the U.S., that’s like a 20% or 25% increase in electricity consumption. And if you did that over 20 years, that’s like 1-ish% per year. Right? So that's, that to me is a very credible thing that’s likely to happen. And then when you add heat pumps, you add industrial electrification, a lot more.
I think there will be local impacts. There will be some places where AI and data centers more generally will be important and will drive load growth, but it is not a national story. It is a local story. And so a place like Ireland that has, I think at last count 17%, 18% of its load from data centers, if that grows, that could give them real challenges. Same thing, Loudoun County in Virginia. But you really do have to separate the national story or the global story from the local story.
Jesse Jenkins: I think it was just about a week ago, Nvidia which is the leading producer of the graphics processing units that have become now the main workhorse chips for generative AI computing, they released their new best-in-class chip. And as they revealed that chip, they — for the first time, it sounded like — started to emphasize the energy efficiency improvements of the GPU. And the basic story the CEO told is that it would take about 73% less electricity and a shorter period of time to train AIs on this new chip than it did on their previous best-in-class chip. So that’s just one generation of GPU with nearly three-quarters reduction in the amount of energy consumed per ... I don't know how you measure the units of large language model training, but per smarts trained into generative AI. So yeah, huge gains.
And one might say, well, can that continue forever? And I guess we should maybe get your thoughts on that. But it has continued at least for the last 10 to 20 years. And so there’s a lot of reason to believe that there’s continued gains to be made.
Koomey: Most people, when they think of efficiency, they think of Moore’s Law. They think of shrinking transistors. And anyone who follows this knows that every year or two, there’s another article about how Moore’s Law is ending, or slowing, or you know, it’s getting harder. And there’s no question about it, it’s absolutely getting harder and harder to shrink the transistors. But it turns out shrinking transistors is only one way to improve efficiency and performance. For a long time, the industry relied on that.
From the early days of microprocessors, starting in ’71, over time, they would ramp up the clock speed. And at the same time, they would ramp down the voltage of the chip. And that was called Dennard scaling. It allowed them to keep ramping up performance without getting to crazy levels of leakage current and heat and melting the chip and the whole thing. That worked for a long time, til the early 2000s. And then they hit the threshold voltage for silicon, which is like one volt. So once you hit that, you can no longer do that trick. And they needed new tricks.
So what they did was they, most of you remember who were around at that time, there was this big shift to multiple cores on a chip. That was an innovation in hardware architecture that allowed them, for a time, to improve efficiency by going to software that could run on multiple cores, so you could multiprocess various activities. So that’s one way you can improve things. You can also work on the software — you can improve the efficiency of the software, you can improve the algorithms that you use.
So even if Moore's law shrinkage of transistors stops, which it hasn’t fully stopped. But even if it did, there are a lot of other things we can do. And AI in particular is relatively new. Basically, people threw a whole bunch of money at existing processors because there was this rush to deploy technology. But now, everyone’s stepping back and saying, well, look at the cost of the energy cost and the infrastructure cost. Is there a way to do this better? And sure, there definitely is, and Nvidia proved it in their presentation that you referred to.
This episode of Shift Key is sponsored by…
KORE Power provides the commercial, industrial, and utility markets with functional solutions that advance the clean energy transition worldwide. KORE Power's technology and manufacturing capabilities provide direct access to next generation battery cells, energy storage systems that scale to grid+, EV power & infrastructure, and intuitive asset management to unlock energy strategies across a myriad of applications. Explore more at korepower.com.
Watershed's climate data engine helps companies measure and reduce their emissions, turning the data they already have into an audit-ready carbon footprint backed by the latest climate science. Get the sustainability data you need in weeks, not months. Learn more at watershed.com.
Music for Shift Key is by Adam Kromelow.
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Current conditions: Southern Spain will endure multiple days over 100 degrees Fahrenheit this week • Nearly 4 inches of rain could fall in parts of southwestern China on Tuesday • It will be almost 90 degrees in New Orleans again today after high temperatures triggered widespread brownouts in the region over the weekend.
President Trump signed four executive orders Friday designed to accelerate the build-out of nuclear power in the U.S. The orders specifically call on the Nuclear Regulatory Commission to speed up its approval of new reactors; relax radiation exposure limits; explore using federal lands and military bases as potential reactor sites; and grow the nation’s nuclear energy capacity from approximately 100 gigawatts in 2024 to 400 gigawatts by 2050. The orders also describe putting 10 new large reactors into construction no later than 2030 with the support of the Department of Energy’s Loan Programs Office — including having at least one operational reactor at a domestic military base no later than September 2028. “Mark this day on your calendar,” Interior Secretary Doug Burgum said at the signing on Friday, per The New York Times. “This is going to turn the clock back on over 50 years of overregulation.”
At the same time, the administration’s ambitious goals come against a backdrop of reduced “personnel and funding for the NRC and the Department of Energy, along with weakening the NRC’s independence and global credibility,” Jennifer T. Gordon, the director of the Nuclear Energy Policy Initiative at the Atlantic Council’s Global Energy Center, writes — all of which will “make it challenging to realize the full potential of the U.S. nuclear energy industry.”
EPA
The Environmental Protection Agency is poised to propose that greenhouse gases emitted from fossil fuel-burning power plants “do not contribute significantly to dangerous pollution” or climate change, The New York Times reported Saturday, based on a review of an internal draft of the document. The EPA’s rationale in the proposal is that the emissions from the sector are small enough that their elimination would have no impact on public health — although according to the agency’s own accounting in 2022, the power sector is the second biggest source of greenhouse gas emissions in the country, behind only transportation.
The move by the EPA, while in keeping with the Trump administration’s deregulatory ambitions, also serves to justify its pending proposal to “repeal all greenhouse gas emissions standards for fossil fuel-fired power plants,” including coal-powered units. Previously, the agency had argued that Biden-era restrictions on coal- and gas-fired plants could prevent up to 1,200 deaths and 1,900 cases of asthma per year.
BYD
BYD announced steep discounts on 22 of its electric and plug-in hybrid models between now and the end of June, with some price cuts as big as 34%, Bloomberg reports. The company’s cheapest car, the Seagull hatchback, is down to just $7,780, while the Seal hybrid sedan saw the steepest discount of more than $7,000, to a mere $14,270. Shares of BYD closed down 8.6% after the announcement.
BYD’s cuts aim to boost customer demand, with Citi analysts anticipating the discounts could increase dealership foot traffic by 30% to 40% week on week. But the analysts also appeared skeptical that the move by BYD would be hugely beneficial to the company in its price war with rival EV automaker, noting “competition remains relatively mild.”
South Africa has proposed a liquified natural gas trade package with the United States, following a contentious meeting between President Cyril Ramaphosa and President Trump last week, Reuters reports. The deal would see South Africa import 75 to 100 petajoules of LNG annually from the U.S. over a 10-year period. Though South Africa currently does not have an LNG import terminal, the government plans to build one at the Port of Richards Bay, with the first phase going online by 2027, in order to lessen its reliance on the dwindling supply via pipeline from Mozambique. The U.S. will reportedly also help South Africa explore fracking opportunities within South Africa; the Karoo region of the country is believed to hold shale reserves, though drilling has been held off due to concerns about contaminating the water supply.
The trade package additionally includes an agreement for South Africa to avoid paying a duty on imports of cars, steel, and aluminum. According to Minister in the Presidency Khumbudzo Ntshavheni, who shared details of the deal, it will amount to $900 million to $1.2 billion in trade per year.
President Trump on Friday urged the United Kingdom to “stop with the costly and unsightly windmills and incentivize modernized drilling in the North Sea, where large amounts of oil lay waiting to be taken,” the Associated Press reports. Trump specifically cited Aberdeen as a potential hub for the “century of drilling left” — the same Scottish city where his Trump International Golf Links golf course is located, and where he unsuccessfully opposed the building of 11 offshore turbines before he became president. Despite Trump’s frequent complaints that turbines are eyesores, the BBC reported this weekend that wind farms have become an “unusual” and “surprisingly popular” tourist attraction in the UK.
Four former Volkswagen executives were found guilty of fraud in Germany on Monday for their role in the 2015 “dieselgate” emissions test cheating scandal.
The founder of Galvanize Climate Solutions and a 2020 presidential candidate does some math on how smart climate policy could help the U.S. in a trade war.
We’re now four months into a worldwide trade war, and the economic data confirms it’s Americans who are paying the price. A growing body of surveys and forecasts indicate that inflation will be a persistent, wallet-draining reality for U.S. households. Voters now expect inflation to hit 7.3% next year, and as of March, the Organisation for Economic Co-operation and Development projects that tariffs and trade tensions could help drive U.S. inflation up by 0.3 percentage points in 2025.
But there are solutions for whipping inflation. One is unleashing an abundance of clean energy.
Clean energy can have a powerful deflationary ripple effect, lowering prices across the economy. Solar has for years been the cheapest form of new energy around the world, and recent research from Goldman Sachs shows that prices of clean technologies like large-scale solar power and battery storage are falling. These lower costs are helping to keep electricity prices more stable, even as demand rises due to the growing number of data centers, the return of U.S. manufacturing, and the electrification of transport and heating.
As a thought experiment, my team gathered data on the U.S. energy market to estimate the potential deflationary effect that accelerating clean energy development could have on the American economy. At the end of our analysis, we found that accelerating renewable energy development nationwide could reduce inflation by 0.58 percentage points — meaning that if inflation were running at 4%, widespread clean energy would bring it down to 3.42%. This would save the average American family approximately $441 each year, or nearly three months’ worth of electricity bills.
While our model doesn’t completely capture all of America’s regional complexities regarding energy policy or resource availability, it shows what’s possible. Call it the “Clean Energy Dividend” — a measurable financial return Americans receive when renewable deployment expands.
These numbers are based on something that’s already happening in Texas, where building new clean energy projects is relatively easy. Since 2019, Texas has expanded its solar capacity by 729% and wind power by 49%, faster than any other state in the nation. These developments have added approximately 39,000 gigawatt-hours of solar, 41,000 gigawatt-hours of wind to the Texas grid. In that same time, Texas has also added 9,300 megawatts of battery capacity — a 8,941% increase.
To match Texas’ success, the rest of America would need to significantly ramp up its clean energy production. According to our analysis, the other 49 states combined would need to produce nearly 73% more renewable electricity than currently planned for 2025. That means that instead of adding 66,300 gigawatt-hours of clean power to the grid this year as projected, they’d need to add 114,700 gigawatt-hours. It’s an ambitious target, but one that would help keep costs down for consumers and businesses.
The deflationary impact would hit in two ways: from direct reductions in electricity bills and from lower costs for goods and services.
First, on direct reductions: The Electric Reliability Council of Texas market, otherwise known as ERCOT, is projected to experience a 12% decrease in wholesale electricity prices from 2024 to 2025; the rest of the United States, meanwhile, is expected to see a 3% increase in retail electricity prices during the same period. This creates a 15% gap between Texas and the national average.
The average American household uses about 10,791 kilowatt-hours of electricity annually, which currently costs approximately $1,779 per year. With a projected 3% national increase, this would rise to $1,828 in 2025. If prices fell by 12% as in Texas, however, the cost would decrease to $1,571, resulting in a direct savings of about $258 per household.
Second, beyond direct savings: Our analysis found that electricity costs constitute about 2.4% of all business expenses in the economy. When businesses pay less for electricity, they typically pass about 70% of those savings to consumers through lower prices. This translates to an additional $183 in annual savings per household on everyday goods and services.
Combining these figures, the total benefit per household would be $441 annually. In terms of inflation, the direct effect on electricity bills contributes 0.34%, and the indirect effect through price decreases on other goods contributes 0.24%. Together, they account for a 0.58% reduction in inflation.
Far more than the U.S. would like to admit, its economy remains highly susceptible to oil shocks. Nearly every economic recession in the U.S. since the 1940s has been preceded by a large increase in the price of fossil fuels. Similarly, all but three oil shocks have been followed by a recession. And while the price of oil is low now, this doesn’t guarantee it will be in the future. When energy costs rise sharply — whether from conflicts, production cuts, or supply chain disruptions — the effects cascade through every sector of our economy.
Renewable energy serves as a powerful buffer against these inflationary pressures. That said, expanding renewable energy faces challenges. Some communities oppose projects such as wind and solar farms due to concerns about land use, aesthetics, and environmental impacts, leading to delays or cancellations. At the national level, the Trump administration is doing everything it can to hinder investment and slow the growth of renewable energy infrastructure. These obstacles can impede progress toward a more stable and affordable energy future — even in Texas.
There, Republican lawmakers have introduced a wave of legislation aimed at imposing new fees and regulatory hurdles on renewable energy projects, restricting further development, and mandating costly backup power requirements. These measures could raise wholesale electricity prices by 14%, according to an analysis by Aurora Energy Research. Just as the rest of America should be emulating Texas’ success, Texas is busy unraveling it to resemble the rest of America.
Still, there are several factors that can speed renewable deployment nationwide: streamlining permitting processes, developing competitive electricity markets, ensuring sufficient transmission infrastructure, and passing supportive regulatory frameworks. While geography will always affect which resources are viable, every region has significant untapped potential — from geothermal in the West to solar in the South.
No matter where you stand on decarbonization and the fight against climate change, we should pay attention to any idea that can fight inflation, put money back in Americans pockets, create jobs, make our energy more secure, and help the environment all at once. The Clean Energy Dividend may not solve everything—but it’s about as close to a win-win-win as we’re going to find.
Empire Wind has been spared — but it may be one of the last of its kind in the U.S.
It’s been a week of whiplash for offshore wind.
On Monday, President Trump lifted his stop work order on Empire Wind, an 810-megawatt wind farm under construction south of Long Island that will deliver renewable power into New York’s grid. But by Thursday morning, Republicans in the House of Representatives had passed a budget bill that would scrap the subsidies that make projects like this possible.
The economics of building offshore wind in the U.S., at least during this nascent stage, are “entirely dependent” on tax credits, Marguerite Wells, the executive director of Alliance for Clean Energy New York, told me.
That being said, if the bill gets through the Senate and becomes law, Empire Wind may still be safe. The legislation would significantly narrow the window for projects to qualify for tax credits, requiring them to start construction by the end of this year and be operational by the end of 2028. Equinor, the company behind Empire Wind, maintains that it aims to reach commercial operations as soon as 2027. The four other offshore wind projects that are under construction in the U.S. — Sunrise Wind, also serving New York; Vineyard Wind, serving Massachusetts; Revolution Wind, serving Rhode Island and Connecticut; and Dominion Energy’s project in Virginia — are also expected to be completed before the cutoff.
Together, the five wind farms are expected to generate enough power for roughly 2.5 million homes and avoid more than 9 million tons of carbon emissions each year — similar to shutting down 23 natural gas-fired power plants.
Still, this would represent just a small fraction of the carbon-free energy eastern states are counting on offshore wind to provide. New York, for example, has a statutory goal of getting at least 9 gigawatts of power from the industry. Once Empire and Sunrise are completed, it will have just 1.7 gigawatts.
If the proposed changes to the tax credits are enacted, these five projects may be the last built in the U.S.
That’s not the case for solar farms or onshore wind, Oliver Metcalfe, head of wind research at BloombergNEF told me. They can still compete with fossil fuel generation — especially in the windiest and sunniest areas — without tax credits. That’s especially true in today’s environment of rising demand for power, since these projects have the additional benefit of being quick to build. The downside of losing the tax credits is, of course, that the power will cost marginally more than it otherwise would have.
For offshore wind farms to pencil out, however, states would have to pay a much higher price for the energy they produce. The tax credits knock off about a quarter of the price, Metcalfe said; without them, buyers will be back on the hook. “It’s likely that some either wouldn’t be willing to do that, or would dramatically decrease their ambition around the technology given the potential impacts it could have on ratepayers.”
Part of the reason offshore wind is so expensive is that the industry is still new in the U.S. We lack the supply chains, infrastructure, and experienced workforce built up over time in countries like China and the U.K. that have been able to bring costs down. That’s likely not going to change by the time these five projects are built, as they are all relying on European supply chains.
The Inflation Reduction Act spurred domestic manufacturers to begin developing supply chains to serve the next wave of projects, Wells told me. It gave renewable energy projects a 10-year runway to start construction to be eligible for the tax credits. “It was a long enough time window for companies to really invest, not just in the individual generation projects, but also manufacturing, supply chain, and labor chain,” she said.
Due to Trump’s attacks on the industry, the next wave of projects may not materialize, and those budding supply chains could go bust.
Trump put a freeze on offshore wind permitting and leasing on his first day in office, a move that 17 states are now challenging in court. A handful of projects are already fully permitted, but due to uncertainty around Trump’s tariffs — and now, around whether they’ll have access to the tax credits — they’re at a standstill.
“No one’s willing to back a new offshore wind project in today’s environment because there’s so much uncertainty around the future business case, the future subsidies, the future cost of equipment,” Metcalfe said.