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Five years from the emergence of the disease, the world — and the climate — is still grappling with its effects.

Five years ago this month, the novel coronavirus that would eventually become known as Covid-19 began to spread in Wuhan, China, kicking off a sequence of events that quite literally changed the world as we know it, the global climate not excepted.
The most dramatic effect of Covid on climate change wasn’t the 8% drop in annual greenhouse gas emissions caused by lockdowns and border closures in 2020, however. It wasn’t the crash in oil prices, which briefly went negative in April 2020. It wasn’t the delay of COP26 and of the United Nations Intergovernmental Panel on Climate Change’s Sixth Assessment Report. And it wasn’t, sadly, a legacy of green stimulus measures (some good efforts notwithstanding).
Rather, it was in the way the world’s governments (especially the largest and most powerful) responded to the virus, which undermined the very idea of multilateralism, climate action included. This took place along three main vectors: inertia on global financial rules, even as long-acknowledged failings turned catastrophic; a renaissance in industrial policy that may prove transformative for domestic fiscal policy; and, at the intersection of both, deterioration of what we might call geopolitics or “global solidarity.”
Evidence of this phenomenon can be found in nearly every aspect of the global order. The World Bank in October pointed to Covid as chief among a “polycrisis” of “multiple and interconnected crises occurring simultaneously, where their interactions amplify the overall impact.” Development gains have almost slowed to a halt. Extreme poverty has increased overall in low-income countries since 2014, after decades of improvement, according to the World Bank’s analysis.
None of this, however, was an inevitable effect of Covid. Poor countries got poorer, for the most part, because of norms and hard rules in global finance that they have little control over — what a group of researchers last year termed “financial subordination.”
To understand why, a brief history: Developing countries during the 2010s were seeking new avenues of finance as traditional sources like multilateral development bank loans, official development assistance, and commercial bank loans waned. Many turned to the U.S. dollar sovereign bond markets, and also to China; a few countries also turned to commodity traders like Glencore and Trafigura, taking on opaque debts to be repaid with their own oil and other commodities.
When the pandemic response shut down many kinds of economic activity in 2020, what World Bank researchers called a “fourth wave” of debt followed. After a continuous series of debt surges from 1970 to 1989, 1990 to 2001, and 2002 to 2009, global debt markets had been relatively stable for the preceding decade. What was different about this fourth wave was that it was largely in developing countries.
With Covid, the fourth wave turned into a tsunami. Countries everywhere were paralysed by the pandemic, but the poorest ones lost critical revenue from tourism, remittances, and some exports. On top of that, they suffered the same lockdowns and illness that depressed local economic activity and drained government budgets in many countries. Unlike rich countries, developing countries had limited ability to dip into reserves or raise money from the bond markets to keep their citizens safe and tide over those who lost work.
Wealthy countries and lenders did little to ameliorate this stress. A “Debt Servicing Suspension Initiative” facilitated by the G20 provided some relief for 46 countries; China participated, too, granting deferrals to some of its debtor countries. But private bondholders (who were earning returns as high as 9%) and multilateral banks did not. The debts still had to be paid, and by 2023, aggregate net capital flows were negative for developing countries — that is, more money flowed from poorer countries to richer ones than the other way around.
Numerous governments defaulted on their debts in the wake of Covid, including Ghana, Sri Lanka, Zambia, Ethiopia, and Suriname. But perhaps just as bad, many, many more countries continued to pay their debts by slashing their health and social welfare budgets just as they were needed most. Low- and middle-income countries spent more on debt servicing in 2022 than they spent on health in 2020, during the height of the pandemic.
Tensions between the U.S. and China, meanwhile, became even more overt around Covid, helped in part by accusations and recriminations over the source of the disease. The two great powers were themselves deeply changed. China emerged from its Covid Zero measures with public discontent at a nearly unprecedented pitch and its engines of economic growth — domestic infrastructure and residential property — faltering as vast local government debts became unmanageable. The country’s central government renewed its focus on an export-led growth model, but this time instead of cheap, low-tech consumer goods, it was semiconductors, solar panels, and electric vehicles.
It quickly became clear that the Biden administration would not be much less hawkish towards China than Trump’s was. It largely focused inwards, on tackling the disenfranchisement of formerly solid Democratic working class constituencies that Trump had exploited and Covid deepened. These were largely seen as an outcome of untrammelled free trade — especially with China. But Covid lockdowns and the rush to regain normalcy in the re-opening choked complex supply chains and logistics networks, driving up prices around the world and helping to spark a global inflation crisis that has yet to meaningfully abate in many parts of the world.
When Russia invaded Ukraine, energy prices shot up, particularly in those countries reliant on imported oil and natural gas. This shook the global fossil energy economy. Exports of liquified natural gas by the United States to Europe skyrocketed, as European countries desperately sought alternatives to Russian piped gas. Those same desperate Europeans also bought LNG shipments that had been bound for countries like Bangladesh and Pakistan, outbidding the poorer countries which then endured blackouts and further hits to their financial reserves as they struggled to match the new EU price.
Global energy price rises compounded the Covid supply-chain pressures and monetary policymakers decided hiking interest rates was unavoidable. While Russian troops tried to capture Kyiv in March of 2022, the U.S. Federal Reserve — perhaps the most powerful U.S. entity for the rest of the world — began hiking interest rates, taking them from just a quarter of a percent before the invasion to more than 5% by mid-2023. This strengthened the U.S. dollar, heaping more pressure on developing countries trying to pay dollar-denominated debts. Meanwhile, in rich and poor countries alike, the jump in living costs has helped drive backlashes against incumbents, and a surge in far-right populism.
Perhaps years ago, if we’d known that we’d see a spike in temperatures, droughts, and storms alongside a flood of cheap solar panels and EVs, technological breakthroughs in batteries, and a renewed interest in industrial policy, it might have seemed that more urgent climate action was assured. Instead, divisions have worsened. The agreement text from this year’s United Nations climate conference is actually slightly watered down from the last year’s statement on fossil fuel phaseout. A special conference on biodiversity Cali, Colombia, finished last month only when delegates had to catch flights home, and a desertification conference hosted by Saudi Arabia finished this month with no group statement.
Rachel Kyte, the UK special envoy for climate change, told an event hosted by the Overseas Development Institute think tank that even as it approached its 10-year anniversary, the 2015 Paris Agreement was more fragile than it had ever been. Countries like the UK, she said, had been inflicting “paper cuts” on developing countries for so long that the ill will was becoming impossible to wave away.
“[W]e’ve also cherry-picked which international laws we want to stand behind and then, which conflicts we believe the international law is important for and not,” she added. “And you sit in the climate negotiations and they know that you know that they know that you know.”
And yet a hopeful note sounding out of all of this has been the central role of clean energy in many countries’ responses to the increasingly fractious global landscape. Responses to Covid, as chaotic as they were, demonstrated that governments can take decisive action. Although the vast majority of Covid stimulus was climate-neutral at best; about a trillion dollars’ worth of investments really were green. Efforts to boost cycling gained ground in some cities, including in Paris, where bike trips now outnumber car trips in and around the city center.
Renewed interest in energy security sparked by the Ukraine invasion has been largely supportive of clean energy. Europe’s combined wind and solar generation rose 10% in the first year after the invasion as the bloc made its emissions reduction target more ambitious. Green industrial policy introduced by the Biden administration has encouraged other countries to see decarbonization as a competitive opportunity rather than an obligation. And China’s doubling down on its manufacturing of the “new three” — batteries, EVs, and solar panels — has created an oversupply that spurred rapid uptake of clean energy in many countries.
Fractures, however, are rife. Too many countries have steep tariffs on clean energy imports preventing them from taking advantage of cheap Chinese components, adding to other barriers to clean energy generation, such as the restrictive planning rules in Japan, where renewable energy generation lags; even wind power, where the country has ample potential, was virtually flat for the decade to 2022. Tariffs on imports to the U.S., while helping to build a domestic industry, also slow the rate of deployment. Globalized supply chains tend to be cheaper; a study in Nature estimated that they saved the U.S. up to $31 billion in the 12 years leading up to 2020, while China saved up to $45 billion, compared to a scenario in which domestic suppliers were prioritized. Even with its rapid expansion in clean tech manufacturing thanks to the Inflation Reduction Act, it will take years for the U.S. to catch up to China’s capabilities, while in the meantime, tariffs will slow down installations.
For those in wealthier and more powerful countries, there’s at least a chance of political shift. For countries under financial subordination, there are hard limits to what can be achieved.
Geopolitical alignment is an increasingly sensitive question for countries trying to avoid the pitfalls of appearing to be too close to either China or the U.S. Auto manufacturing has become the site of intense competition and tension, with the U.S. and EU putting punitive tariffs on Chinese EV imports to compensate for “state subsidies.” The introduction of the European carbon border adjustment mechanism this year, which penalizes high-carbon imports so they don’t undermine the continent’s carbon pricing regime, has introduced a new source of tension around trade, particularly for African countries that rely on exports to Europe and are nowhere near having their own carbon accounting scheme that is a prerequisite to avoiding the surcharges.
We may only know in retrospect, but the supply bottlenecks and inflationary surges associated with the Covid lockdowns and reopenings may have been a kind of masked transition phase into a new, more permanently supply-constrained world. Researchers at Potsdam Institute and the European Central Bank published new research in March showing that climate change impacts will raise general inflation by more than a percentage point by 2035.
The damage could be seen in the recent COP29 in Azerbaijan. Trust was close to an all-time low over negotiations for a new target for finance flows from wealthy to poor countries. After it ended with a controversially low $300 billion target, Fiona Harvey of the Guardian called it the second worst COP of the 18 she’s attended, surpassed only by the disastrous 2009 COP15 in Copenhagen, which ended with no agreement at all. It can also be seen in the rebound in emissions since 2021.
While some hopeful shifts have emerged from the Covid era, the increasingly febrile global atmosphere risks endangering our already slim chances of protecting the habitable atmosphere. As climate impacts worsen, pushing back on that axiom will be more difficult, but more urgent. Combating climate change is such a monumental undertaking that collaboration – in technology, manufacturing, knowledge, and diplomacy – will be vital.
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BAAJA would likely help speed up the U.S. transmission buildout, but there’s a chance we’re undercounting the benefits.
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As you may have seen, my colleague Emily Pontecorvo and I got the first look at the Rhodium Group’s analysis of what the bipartisan permitting bill will do to emissions.
You can read our story at Heatmap. The upshot is that the bill’s most significant provisions are likely neutral for climate change in a worst-case scenario — and could, in more optimistic scenarios, help reduce emissions. (Those scenarios aren’t about how the bill will be interpreted, to be clear, but about what might happen in the broader energy economy — with economic growth, for instance, or oil prices — that will feed back into the emissions math.)
I won’t give away much more about our story, but there is one irony I want to note about the Rhodium study and the broader morass of American electricity policy. One of the Rhodium study’s big findings is that BAAJA will help expand the transmission system. Power lines are essential for decarbonization because they move electricity from the country’s sunniest and windiest places to its cities, towns, and suburbs.
BAAJA will help transmission both because the law affirmatively expands the power grid and because the bill’s changes to environmental review law could help power lines. Today, for instance, it takes twice as long on average to conduct a federal environmental impact study for transmission lines as it does for pipelines, according to Rhodium data. All in all, the Rhodium analysis estimates BAAJA could increase the amount of new transmission capacity added per year by 167% to 262% nationwide, compared to the average rate over the past decade.
Which is very interesting. But it’s worth noting that the Rhodium analysis may — emphasis on may — undercount the bill’s transmission benefits. This is because the Rhodium authors did not have time to conduct a full network study of the U.S. transmission system, which would take into effect the grid’s physical footprint, power flows, and existing bottlenecks. Instead, they looked at power supply and demand within the context of the broader U.S. energy system.
That’s a reasonable decision; indeed, it was probably the only decision they could make. Because of how energy system models work, a more fulsome analysis might have taken weeks to complete, not to mention a very large amount of money and computational power. When the National Renewable Energy Lab studied how quickly Los Angeles could switch to 100% renewable energy earlier this decade, for instance, it ran such a study, modeling every transmission line and substation in LA. Its supercomputer wound up churning through more than 100 million simulations; the research effort took three years. If the Rhodium analysts had done even a fraction as much work to examine what BAAJA would mean for the country’s power grid, then they would have of course finished their analysis well after the window to vote on BAAJA would have closed.
One of the ironies here is that while the LA 100 study was particularly exhaustive, we actually require clean energy projects to conduct similar studies all the time. Right now, one of the primary reasons it takes so long to hook up a new power plant to the grid is that it has to undergo an interconnection study in many parts of the country. In those regions, a new solar farm or battery project can’t connect to the grid until operators study its effect on grid congestion everywhere else.
As it happens, BAAJA aims to fix this process, allowing power plants to join the grid in batches.
I want to note the irony that a process we mandate for the power sector is actually too slow to deliver speedy policy analysis to legislators. If Rhodium had tried to study BAAJA the way we make power plants study the grid, then it never would have delivered its verdict in time. If you think Congress is slow, in other words, you should meet the electricity sector.
Current conditions: The Pineapple Express, an atmospheric river originating in the Pacific near Hawaii, is arriving in the Southwest laden with heavy rain that’s set to flood the region • Indonesia has the worst air quality in the world as forest fires rage along Sumatra’s southern coast • A cross-country storm will soak much of the United States on Tuesday’s Election Day.
The Senate’s grand compromise to simplify federal permitting on energy projects would likely drop emissions slightly as the benefits to accelerating deployments of clean energy infrastructure outweigh the boost the legislation could give to fossil fuels. Even under the worst-case scenario, emissions remain on the same trajectory as today. That’s according to a hotly anticipated new analysis by the Rhodium Group, the consultancy whose U.S. emissions estimates are among the most widely cited in American politics. The report, shared first with my colleague Emily Pontecorvo, found that provisions in the Bipartisan American Affordability and Jobs Act largely counteract each other on climate. The bill makes building transmission lines much easier, a key step to patching more renewables onto the grid. But it also makes new gas pipelines simpler to permit, clearing the way for a buildout of the infrastructure for the fossil fuel already dominating U.S. electricity and heating systems. Still, under the best-case scenario, the legislation could cut U.S. economy-wide emissions by 5% below where they would otherwise go in 2040. The bill could also slash energy bills by $78 per year and support construction of more than 200 gigawatts of clean energy capacity, as compared to a world where it didn’t pass. The Rhodium report is at least the second analysis yet to find that the bill could modestly lower emissions. The first, as I reported last week, came from the think tank Resources for the Future, which saw a slight drop in power-sector emissions relative to a world without BAAJA.
If overhauling national permitting rules to make building green energy infrastructure easier doesn’t work to lower emissions, traditional negotiations in favor of regulations that can deliver cuts looks no more promising. Two weeks of United Nations-led talks in Armenia ended Saturday without a settled approach to meeting 2030 deadlines for preserving more nature. “We don’t need to spend more to close the biodiversity funding gap, we need to spend better,” Marina Von Weissenberg, a Finnish senior ministerial advisor, said in a statement. “Governments have a real opportunity here to reshape public spending with future generations in mind, but they can’t do it alone. International coordination is key to giving governments the confidence to lead change.”
Last week, my colleague Katie Brigham published a detailed feature highlighting China’s tightening grip over the global supply chain for electrolyzers, the technology that zaps water with electricity to separate the molecule’s hydrogen from its oxygen and harvest the former as fuel. Keen readers of this newsletter recognize the story. Even before the Iran War, China had beefed up its public support for green hydrogen and related technologies. After the conflict constricted the flow of oil through the Strait of Hormuz, the People’s Republic redoubled its efforts. Quite literally. New data from the National Energy Administration shows that investments into the hydrogen industry doubled in the first nine months of this year, according to Hydrogen Insight.
Fermi America went public in a gangbusters initial public offering last year as the company, with a board of directors including former Texas governor and U.S. Secretary of Energy Rick Perry, pledged to build the world’s largest data center and power the facility with gas and four large-scale Westinghouse AP1000 nuclear reactors. In April, the chief executive and chief financial officer quit. The board room drama continued into the next month. The company’s stock recovered somewhat over the summer as investors bet on a turnaround pegged to a series of deals with companies looking to lease space on its future servers. But fresh chaos enveloped the startup Friday when The Texas Tribune reported that Perry had failed to earn enough support from the board of directors to win reelection to his seat.
In a statement posted to X on Friday evening, Fermi said that neither Perry nor investor Jeffrey Stein had been removed from the company’s board. “In fact, both Governor Perry and Jeffrey Stein received a majority of the votes cast by shareholders,” the statement read. “Let’s be clear: Governor Perry and Mr. Stein remain members of Fermi’s Board of Directors and will continue serving until their successors are duly elected. Both remain eligible for reelection.”
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If you thought the fine particulate matter from last year’s catastrophic Los Angeles firestorm was bad, you weren’t thinking imaginatively enough about just how dangerous all that airborne material could be. A new study published in the journal Science Advances suggests that upward of 7 million people were exposed to high levels of airborne lead and other toxic metals released when homes and vehicles caught flame. The January 2025 Eaton inferno that destroyed more than 9,400 buildings and killed 19 people spewed 80 times the normal concentration of lead found in the atmosphere through a plume that settled over 70% of the Los Angeles metropolitan area. “I can envision that in the future we have these evacuation zones for smoke exposure as well,” Haroula Baliaka, the study’s lead author, who was a PhD candidate at Caltech last year, told Bloomberg. “Unfortunately, this is not a one-time event. It’s a new reality and we need to adapt to it and we need to do it sooner rather than later.”
The findings come a week after a study published in JAMA Pediatrics showed a link between wildfire smoke exposure during pregnancy and autism diagnoses in children. The research from Rutgers University examined 893,212 mother-child pairs enrolled in Medicaid, with children born between 2007 and 2014. Each increase of 0.75 micrograms per cubic meter in average concentrations of wildfire-related air pollution during pregnancy was associated with a 30% higher risk of a subsequent autism diagnosis. Exposure in the second and third trimesters had the highest risk. “Wildfire smoke can travel far beyond the communities where fires are burning, and exposure may occur even when smoke is not visible,” Stefania Papatheodorou, an epidemiologist at the Rutgers School of Public Health and lead author of the study, said in a press release. “Our findings highlight the importance of awareness of wildfire events and their potential effects on air quality during pregnancy.”
The United Kingdom is building out more than 10 gigawatts of offshore wind as London looks to shore up its electricity supplies amid the global energy shock. But Chancellor of the Exchequer John Healey said he would veto any offshore wind projects that don’t lower bills. While clean power is “how we break the grip of international gas prices on our bills,” he said the infrastructure “has to come at the right pace, in the right places, with the grid to carry it.” The statement fueled what The Guardian called “concerns that the government is moving away from the pro-renewables agenda.”
Meanwhile, the U.S. midterms aren’t the only election this week. In Sunday’s runoff election, Bulgaria’s pro-Russian acting President Iliana Iotova appeared to eke out a victory over the former prime minister Andrei Gyurov, a pro-Western banker. Her win unites the government with her close ally, Prime Minister Rumen Radev, ensuring stronger support for the leader’s two signature energy policies. One, a plan to build a pair of Westinghouse AP1000s at the Kozloduy nuclear plant, is scheduled to advance to the next planning stage next year. The other, the easing of sanctions on Russian uranium to ensure a supply of fuel for the plant’s existing reactors, looks likely to continue under Iotova’s friendly diplomacy with the Kremlin.
William Nordhaus, the pioneering Yale University economist who won the Nobel Prize in 2018 for integrating climate change into macroeconomic analysis, has died at 85 following a battle with an aggressive form of brain cancer. His nephew, Ted Nordhaus of the Breakthrough Institute, referred to his father, Robert Nordhaus, as “the original environmental lawyer and Bill as the original environmental economist,” he wrote in a blog post after his uncle’s passing. “It is safe to say that the Nordhaus brothers were doing environmental law and economics, respectively, long before either label existed. Not bad for two kids who grew up in the intellectual hotbed of Albuquerque, New Mexico, population 40,000, during and after the second world war.” Their legacies are something of the Nordhaus family brand: Pragmatism. May his memory be a blessing.
Even in the worst-case scenario, BAAJA wouldn’t increase emissions, an analysis by the Rhodium Group concludes.
The bipartisan permitting reform bill is likely to slightly cut greenhouse gas emissions and lower electricity bills by 2040 — or at worst leave emissions on the same trajectory that they are on today — as compared to the status quo, according to a new analysis of many of its provisions by the Rhodium Group, an independent research firm.
The analysis examines the policies in the Bipartisan American Affordability and Jobs Act, or BAAJA, that would have the most-clear cut effects on climate pollution and the energy system. It is the most comprehensive account of the bill’s effects on emissions so far, although it does not examine all of its provisions.
The bill is hard to analyze because — unlike recent partisan energy bills, such as the Inflation Reduction Act or President Trump’s tax and spending bill — its effects on the climate are more ambiguous and often seem to counteract each other. BAAJA will make it easier to build not only long-distance transmission lines, which are essential for clean energy, but also natural gas pipelines, which can expand fossil fuel production.
Yet the climate benefits likely outweigh or balance out the harms, at least among the studied policies, the report finds. In the best case scenario, the bill could cut U.S. economy-wide emissions by 4%, reduce energy bills by $78 per year, and drive more than 200 gigawatts of new clean energy capacity by 2040, compared to status quo policy. In a worst case scenario, greenhouse gas emissions would remain unchanged on their current trajectory.
The results should be viewed as more directionally instructive than a precise accounting of the legislation, Ben King, an energy and climate director at Rhodium, told me.
“We don’t see emissions increasing because of the bill,” King said. “This bill should drive some emission reductions, it should drive some more clean energy on the grid, and it should drive electricity bills down. And given the complexity of the bill, that’s what we can say at this point.”
The analysis does not look at the bill’s permitting certainty provisions, which Democrats initially sought to stop President Trump’s war on wind but have become one of its thorniest sections. Rhodium’s modeling is also a crude tool for assessing transmission policy, since the model can look only at economic inputs such as supply and demand, and not the physical reality of the U.S. grid, such as where transmission lines run or where the bottlenecks are.
It is the second analysis to find that the bill could modestly lower carbon pollution. A more limited report focusing only on the power grid, published last week by the think tank Resources for the Future, found the legislation could cut electricity emissions by 6% while reducing electricity system costs by $350 billion through 2050.
The effects of the bill may sound small, but BAAJA is not a climate bill. It’s not engineered to reduce reliance on fossil fuels or boost clean energy technologies. Its overarching purpose is to address various federal bottlenecks that bog down America’s ability to build stuff, whether that’s a pipeline or a highway or a power line or a solar farm. So it’s not entirely surprising that it’s not expected to have a dramatic effect on emissions.
The reason it’s a priority for Senate climate champions is that many of its provisions are important precursors to decarbonizing the U.S. economy more quickly. By enabling faster expansion of the power grid, the bill would put the country in a much better position to transition to clean energy. After Joe Biden’s big climate bill, the Inflation Reduction Act, passed in 2022, Princeton University researchers found that the country’s slow buildout of transmission lines would be a major obstacle to gleaning the law’s benefits. Unless the country more than doubled the rate of transmission expansion, they wrote, more than 80% of the IRA’s emission reduction potential by 2030 would be lost.
BAAJA could nearly triple the build rate of high-voltage transmission, the Rhodium Group found, from an average of about 0.7 terawatt-miles added per year over the past decade to an average annual pace of 1.9 to 2.6 terawatt-miles through 2040. Because Republicans and President Trump have repealed so many of the IRA’s provisions, this won’t drive as much clean energy as the Princeton researchers expected, but Rhodium estimates that by 2040, BAAJA would help between 17 and 249 gigawatts of clean resources get built compared to a world without it.
The growing grid is the main reason why the bill cuts energy costs, because it enables more lower-cost resources to connect to the grid. The bill’s requirement that data centers pay the full cost of connecting to the grid also puts downward pressure on electricity rates.
“If your goal is to do climate policy in the future, this is an important down payment to making progress there,” King said.
The authors studied the bill’s provisions under a range of economic assumptions, including a “best case” scenario in which clean energy gets cheaper and easily outcompetes natural gas, and a “worst case” scenario where natural gas prices collapse and the inexpensive fuel keeps dominating the U.S. energy system.

The authors limited their analysis to the bill’s provisions that speed up transmission line and natural gas pipeline permitting. They assumed that when you make it easier to approve transmission lines, the lines get cheaper to build and get built more quickly. The same goes for gas pipelines. Then they looked at how the energy system would respond. Would we build more power plants? Would there be more natural gas production? Where will that gas go?
The caveats, aside from omitting the bill’s “project certainty” provisions, are that they did not account for policies that support geothermal energy, virtual power plants, advanced transmission technologies, or the ways in which the bill would reduce congestion on the grid — all of which could result in fewer emissions. At the same time, the modeling assumes that all of the data centers that get built between now and 2040 connect to the grid, even though today, many data centers are planning to run on inefficient off-grid natural gas plants. That means this modeling likely underestimates emissions from data centers. (Although the authors did a separate exercise that went deeper into data centers, which I’ll explain shortly.)
The report also limited its analysis to the United States. While the modeling found that liquified natural gas exports would increase by 8% to 15% under BAAJA, the authors did not account for how those exports could affect the energy mix or emissions in the rest of the world.
They found that the bill’s changes to the Clean Water Act and the National Environmental Policy Act would enable more gas pipeline development, which, in isolation, would increase emissions relative to a world without BAAJA. More pipelines means more production of oil and natural gas, which means higher methane and CO2 emissions throughout the fossil supply chain. Under a worst case scenario, they estimate a 4% increase in the amount of new gas capacity, although gas-fired generation as a whole increases by less than 1% in 2040. Even then, emissions would simply be flat compared to current expectations.
“On net, the emissions increases that we see there are outweighed by the emissions benefits that come from the transmission provisions of the bill,” King said.
The report also studied how BAAJA might affect data center emissions. Its “base case” scenario — which includes all the analysis I’ve shared with you so far — assumes data centers will make up about 17% of electricity demand by 2040. That figure already supposes huge growth in data center energy consumption, because data centers only use about 5% of U.S. electricity today.
But what if data center demand grows even faster than that? The authors modeled two additional scenarios to see what would happen if data center electricity demand instead accounted for more than a quarter of U.S. electricity demand in 2040.
While BAAJA would make it easier for data centers to connect to the grid, it also includes ratepayer protection provisions that would make it more expensive to do so — roughly 10% more for a 1 gigawatt data center, Rhodium estimates. Determining whether that will drive developers on-grid or off-grid was beyond the scope of the analysis, so the modelers looked at the two extremes — a world where all additional data center demand hooks up to the grid and one where none of it does.
For the on-grid scenario, whether or not that additional demand is met with mostly gas plants or cleaner sources largely depends on the price of fossil versus clean generation. But even if most of the demand was met by natural gas plants on the grid, emissions would still be 30% lower than if it was met by natural gas plants off the grid, Rhodium found.
Editor’s note: This article originally misstated the scope and timing of electricity systems savings in the Resources for the Future study. It has been corrected in this version.