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The Boston Marathon is in three days. The weather forecast this year has been notably chaotic.

The second Saturday of April is the most important weather-related day on New England’s calendar, if not America’s.
The reason? It’s when Boston Marathon Monday finally appears in the 10-day forecast.
Running a marathon is one of the most difficult and grueling challenges in sports; athletes spend months logging hundreds of cumulative miles and dodging injuries in preparation for the big event. And for amateur runners who don’t have an Olympic Games in their cards, Boston is the race — with a tightly competitive field of 30,000 participants, it’s the oldest and most iconic marathon in the world.
Which is why one bad window of weather can ruin everything.
Take 2018, when torrential rain and temperatures in the 30s led more than half of the professional field to drop out. Or 2012, when 4,000 entrants opted to defer their race rather than run in the blazing 89-degree heat. Or 2007, when runners had to face 30-mile-per-hour headwinds and sleet on a course abandoned by no-show volunteers.
So what’s it going to be this year? When the forecast was first announced on Saturday, it was all of the above.
The weather reports leading up to the 2023 marathon, which takes place this coming Monday, have induced a lot of whiplash. Depending on the timing of a weekend storm, runners have been told they will either face “the challenge of rain and gusty winds” on Monday — or, “if the storm front slows down … a very warm and humid day,” Time Out writes. Those would be two very different races and in addition to complicating packing, the uncertainty added another level of anxiety for runners who have nothing better to do than refresh the forecast during tapering. (The latest forecasts have since calmed down a bit.)
Boston is already one of the most meteorologically unpredictable cities in the country and climate change is making reliable forecasts even harder. Future marathon forecasts in particular will be prone to more of the will-it-be-hot-or-cold? back and forth as the warm jet stream and cold Canadian air flip influence over New England in the spring. “Some evidence indicates that the atmosphere may become more ‘wavy’” as the climate continues to warm “and thus these sorts of temperature swings could occur more often,” Adam Schlosser, a senior research scientist at the MIT Center for Global Change Science, told The Boston Globe last year.
The ideal forecast for a marathon is overcast with a temperature of 43.2 degrees Fahrenheit (or slightly colder for elites). But Boston, which has had an average start temperature of 56 degrees over the past 22 years, is getting hotter. In a 2017 Climate.gov study of the Massachusetts Climate Division (which includes Boston), the average maximum temperature was observed to have risen at a rate of 0.3 degrees per decade since 1897, the year of the first race — “more than double the temperature rise recorded for the contiguous United States as a whole (0.12 degrees per decade).” In the last 30 years, that warming has more than tripled, “ranging from 1.0 degree to 1.3 degrees per decade in the Boston area, depending on the exact start and end year you use to calculate the trend.”

Similarly, a 2012 study published in PLOS One found that Boston proper is now “about 4 degrees warmer on average in the spring than it was in the 1890s … due to a combination of global warming and the urban heat island effect associated with large cities.” With the caveat that Beantown’s spring weather can be all over the map in any given year, the researchers further found that if “Boston temperatures were to continue to warm by 4.5 degrees by the end of the century (a mid-range estimate for global warming), there will be a 64% chance that winning times will be slowed” due to the effects of heat on strenuous physical performance.
Race organizers have already taken measures to make conditions safer for athletes; in 2007, the marathon start time was bumped back from noon to 10 a.m., in part to limit exposure to the highest midday temperatures. Still, “the next few decades will tell whether morning start times and heat warnings will be enough to keep winning marathon runners from slowing in a steadily warming world,” Boston University biology professor Dr. Richard B. Primack, who led the study, wrote.
This year, at least, runners can probably relax a little: The latest forecast shows the high topping out at 60 degrees on Monday, with a start temperature of 45 degrees in Hopkinton at 9 a.m. Though there’s a chance of light showers, there is also the possibility of a “helpful” wind on runners’ backs.
You might even call it a perfect spring day. Phew.
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It’s either reassure investors now or reassure voters later.
Investor-owned utilities are a funny type of company. On the one hand, they answer to their shareholders, who expect growing returns and steady dividends. But those returns are the outcome of an explicitly political process — negotiations with state regulators who approve the utilities’ requests to raise rates and to make investments, on which utilities earn a rate of return that also must be approved by regulators.
Utilities have been requesting a lot of rate increases — some $31 billion in 2025, according to the energy policy group PowerLines, more than double the amount requested the year before. At the same time, those rate increases have helped push electricity prices up over 6% in the last year, while overall prices rose just 2.4%.
Unsurprisingly, people have noticed, and unsurprisingly, politicians have responded. (After all, voters are most likely to blame electric utilities and state governments for rising electricity prices, Heatmap polling has found.) Democrat Mikie Sherrill, for instance, won the New Jersey governorship on the back of her proposal to freeze rates in the state, which has seen some of the country’s largest rate increases.
This puts utilities in an awkward position. They need to boast about earnings growth to their shareholders while also convincing Wall Street that they can avoid becoming punching bags in state capitols.
Make no mistake, the past year has been good for these companies and their shareholders. Utilities in the S&P 500 outperformed the market as a whole, and had largely good news to tell investors in the past few weeks as they reported their fourth quarter and full-year earnings. Still, many utility executives spent quite a bit of time on their most recent earnings calls talking about how committed they are to affordability.
When Exelon — which owns several utilities in PJM Interconnection, the country’s largest grid and ground zero for upset over the influx data centers and rising rates — trumpeted its growing rate base, CEO Calvin Butler argued that this “steady performance is a direct result of a continued focus on affordability.”
But, a Wells Fargo analyst cautioned, there is a growing number of “affordability things out there,” as they put it, “whether you are looking at Maryland, New Jersey, Pennsylvania, Delaware.” To name just one, Pennsylvania Governor Josh Shapiro said in a speech earlier this month that investor-owned utilities “make billions of dollars every year … with too little public accountability or transparency.” Pennsylvania’s Exelon-owned utility, PECO, won approval at the end of 2024 to hike rates by 10%.
When asked specifically about its regulatory strategy in Pennsylvania and when it intended to file a new rate case, Butler said that, “with affordability front and center in all of our jurisdictions, we lean into that first,” but cautioned that “we also recognize that we have to maintain a reliable and resilient grid.” In other words, Exelon knows that it’s under the microscope from the public.
Butler went on to neatly lay out the dilemma for utilities: “Everything centers on affordability and maintaining a reliable system,” he said. Or to put it slightly differently: Rate increases are justified by bolstering reliability, but they’re often opposed by the public because of how they impact affordability.
Of the large investor-owned utilities, it was probably Duke Energy, which owns electrical utilities in the Carolinas, Florida, Kentucky, Indiana, and Ohio, that had to most carefully navigate the politics of higher rates, assuring Wall Street over and over how committed it was to affordability. “We will never waver on our commitment to value and affordability,” Duke chief executive Harry Sideris said on the company’s February 10 earnings call.
In November, Duke requested a $1.7 billion revenue increase over the course of 2027 and 2028 for two North Carolina utilities, Duke Energy Carolinas and Duke Energy Progress — a 15% hike. The typical residential customer Duke Energy Carolinas customer would see $17.22 added onto their monthly bill in 2027, while Duke Energy Progress ratepayers would be responsible for $23.11 more, with smaller increases in 2028.
These rate cases come “amid acute affordability scrutiny, making regulatory outcomes the decisive variable for the earnings trajectory,” Julien Dumoulin-Smith, an analyst at Jefferies, wrote in a note to clients. In other words, in order to continue to grow earnings, Duke needs to convince regulators and a skeptical public that the rate increases are necessary.
“Our customers remain our top priority, and we will never waver on our commitment to value and affordability,” Sideris told investors. “We continue to challenge ourselves to find new ways to deliver affordable energy for our customers.”
All in all, “affordability” and “affordable” came up 15 times on the call. A year earlier, they came up just three times.
When asked by a Jefferies analyst about how Duke could hit its forecasted earnings growth through 2029, Sideris zeroed in on the regulatory side: “We are very confident in our regulatory outcomes,” he said.
At the same time, Duke told investors that it planned to increase its five-year capital spending plan to $103 billion — “the largest fully regulated capital plan in the industry,” Sideris said.
As far as utilities are concerned, with their multiyear planning and spending cycles, we are only at the beginning of the affordability story.
“The 2026 utility narrative is shifting from ‘capex growth at all costs’ to ‘capex growth with a customer permission slip,’” Dumoulin-Smith wrote in a separate note on Thursday. “We believe it is no longer enough for utilities to say they care about affordability; regulators and investors are demanding proof of proactive behavior.”
If they can’t come up with answers that satisfy their investors, ultimately they’ll have to answer to the voters. Last fall, two Republican utility regulators in Georgia lost their reelection bids by huge margins thanks in part to a backlash over years of rate increases they’d approved.
“Especially as the November 2026 elections approach, utilities that fail to demonstrate concrete mitigants face political and reputational risk and may warrant a credibility discount in valuations, in our view,” Dumoulin wrote.
At the same time, utilities are dealing with increased demand for electricity, which almost necessarily means making more investments to better serve that new load, which can in the short turn translate to higher prices. While large technology companies and the White House are making public commitments to shield existing customers from higher costs, utility rates are determined in rate cases, not in press releases.
“As the issue of rising utility bills has become a greater economic and political concern, investors are paying attention,” Charles Hua, the founder and executive director of PowerLines, told me. “Rising utility bills are impacting the investor landscape just as they have reshaped the political landscape.”
Plus more of the week’s top fights in data centers and clean energy.
1. Osage County, Kansas – A wind project years in the making is dead — finally.
2. Franklin County, Missouri – Hundreds of Franklin County residents showed up to a public meeting this week to hear about a $16 billion data center proposed in Pacific, Missouri, only for the city’s planning commission to announce that the issue had been tabled because the developer still hadn’t finalized its funding agreement.
3. Hood County, Texas – Officials in this Texas County voted for the second time this month to reject a moratorium on data centers, citing the risk of litigation.
4. Nantucket County, Massachusetts – On the bright side, one of the nation’s most beleaguered wind projects appears ready to be completed any day now.
Talking with Climate Power senior advisor Jesse Lee.
For this week's Q&A I hopped on the phone with Jesse Lee, a senior advisor at the strategic communications organization Climate Power. Last week, his team released new polling showing that while voters oppose the construction of data centers powered by fossil fuels by a 16-point margin, that flips to a 25-point margin of support when the hypothetical data centers are powered by renewable energy sources instead.
I was eager to speak with Lee because of Heatmap’s own polling on this issue, as well as President Trump’s State of the Union this week, in which he pitched Americans on his negotiations with tech companies to provide their own power for data centers. Our conversation has been lightly edited for length and clarity.
What does your research and polling show when it comes to the tension between data centers, renewable energy development, and affordability?
The huge spike in utility bills under Trump has shaken up how people perceive clean energy and data centers. But it’s gone in two separate directions. They see data centers as a cause of high utility prices, one that’s either already taken effect or is coming to town when a new data center is being built. At the same time, we’ve seen rising support for clean energy.
As we’ve seen in our own polling, nobody is coming out looking golden with the public amidst these utility bill hikes — not Republicans, not Democrats, and certainly not oil and gas executives or data center developers. But clean energy comes out positive; it’s viewed as part of the solution here. And we’ve seen that even in recent MAGA polls — Kellyanne Conway had one; Fabrizio, Lee & Associates had one; and both showed positive support for large-scale solar even among Republicans and MAGA voters. And it’s way high once it’s established that they’d be built here in America.
A year or two ago, if you went to a town hall about a new potential solar project along the highway, it was fertile ground for astroturf folks to come in and spread flies around. There wasn’t much on the other side — maybe there was some talk about local jobs, but unemployment was really low, so it didn’t feel super salient. Now there’s an energy affordability crisis; utility bills had been stable for 20 years, but suddenly they’re not. And I think if you go to the town hall and there’s one person spewing political talking points that they've been fed, and then there’s somebody who says, “Hey, man, my utility bills are out of control, and we have to do something about it,” that’s the person who’s going to win out.
The polling you’ve released shows that 52% of people oppose data center construction altogether, but that there’s more limited local awareness: Only 45% have heard about data center construction in their own communities. What’s happening here?
There’s been a fair amount of coverage of [data center construction] in the press, but it’s definitely been playing catch-up with the electric energy the story has on social media. I think many in the press are not even aware of the fiasco in Memphis over Elon Musk’s natural gas plant. But people have seen the visuals. I mean, imagine a little farmhouse that somebody bought, and there’s a giant, 5-mile-long building full of computers next to it. It’s got an almost dystopian feel to it. And then you hear that the building is using more electricity than New York City.
The big takeaway of the poll for me is that coal and natural gas are an anchor on any data center project, and reinforce the worst fears about it. What you see is that when you attach clean energy [to a data center project], it actually brings them above the majority of support. It’s not just paranoia: We are seeing the effects on utility rates and on air pollution — there was a big study just two days ago on the effects of air pollution from data centers. This is something that people in rural, urban, or suburban communities are hearing about.
Do you see a difference in your polling between natural gas-powered and coal-powered data centers? In our own research, coal is incredibly unpopular, but voters seem more positive about natural gas. I wonder if that narrows the gap.
I think if you polled them individually, you would see some distinction there. But again, things like the Elon Musk fiasco in Memphis have circulated, and people are aware of the sheer volume of power being demanded. Coal is about the dirtiest possible way you can do it. But if it’s natural gas, and it’s next door all the time just to power these computers — that’s not going to be welcome to people.
I'm sure if you disentangle it, you’d see some distinction, but I also think it might not be that much. I’ll put it this way: If you look at the default opposition to data centers coming to town, it’s not actually that different from just the coal and gas numbers. Coal and gas reinforce the default opposition. The big difference is when you have clean energy — that bumps it up a lot. But if you say, “It’s a data center, but what if it were powered by natural gas?” I don’t think that would get anybody excited or change their opinion in a positive way.
Transparency with local communities is key when it comes to questions of renewable buildout, affordability, and powering data centers. What is the message you want to leave people with about Climate Power’s research in this area?
Contrary to this dystopian vision of power, people do have control over their own destinies here. If people speak out and demand that data centers be powered by clean energy, they can get those data centers to commit to it. In the end, there’s going to be a squeeze, and something is going to have to give in terms of Trump having his foot on the back of clean energy — I think something will give.
Demand transparency in terms of what kind of pollution to expect. Demand transparency in terms of what kind of power there’s going to be, and if it’s not going to be clean energy, people are understandably going to oppose it and make their voices heard.