
Volts
David Roberts
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05/17/24 • 65 min
In this episode, I talk with CEO Paul Lambert of startup Quilt, which came out of stealth this week with heat pumps that are not ugly. They perform well too, and are easy to buy and install, but mostly they’re not ugly.
This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.volts.wtf/subscribe


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06/12/24 • 95 min
In his book The Price Is Wrong, Brett Christophers argues that, contrary to recent economic triumphalism among renewables advocates, wind and solar are not profitable enough to attract the private capital necessary to scale as fast as they need to scale. In this episode, he and I dig deep (extremely deep) into the details.
This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.volts.wtf/subscribe


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11/29/23 • 63 min
In this episode, longtime solar industry analyst Jenny Chase, author of Solar Power Finance Without the Jargon, catches us up on the current state of the global solar industry and looks to where it’s going.
Text transcript:
David Roberts
Jenny Chase went to work for the London-based startup New Energy Finance in 2005, straight out of university in Cambridge. She founded its solar analysis team and helped establish some of the first reliable indexes of prices in the solar supply chain, as well as some of the first serious industry models and projections.
The solar power industry barely existed then. Now solar is the cheapest source of new power in most markets and the International Energy Agency expects it to dominate global electricity by 2050. Throughout that heady transition, Chase has run and grown the solar analysis team, even after the company was bought by Bloomberg and became Bloomberg NEF in 2009. It has become one of the most respected teams in the business and a widely cited arbiter of industry data.
In 2019, Chase wrote a book summarizing what she learned over her years analyzing the industry. It is called Solar Power Finance Without the Jargon, but the title is somewhat misleading — it covers solar power finance but also solar power history, technology, and policy. It is leavened here and there with droll bits of biography or advice from Chase and contains an incredible amount of information in a highly compact and readable package, just over 200 pages.
A heavily updated second edition was released this month. Also this month came Chase's yearly “opinions about solar” Twitter thread, which is highly anticipated among a certain kind of energy dork [waves].
I figured it would be fun to have Chase on the pod to talk about the current state of the solar industry, whether anything but standard-issue solar PV is ever going to flourish, and what the world needs to help balance out increasing penetrations of solar.
Okay then. Jenny Chase from Bloomberg NEF. Welcome to Volts. Thank you so much for coming.
Jenny Chase
Thank you so much for inviting me, David.
David Roberts
I read your book over the past week and it's just delightful. I really recommend it to anyone. I feel like the title is a little well, I guess it does say without the jargon, but I just feel like the word finance is going to scare off some readers. But it's really just a nice, extremely approachable introduction to this whole thing of solar in the markets and how it's funded and how it's proceeded over the years. So I really was charmed by it. I noticed actually that it had a little bit of kind of autobiography in the first few chapters and I thought it was really kind of funny.
I had never really thought about it, but you and I have some parallels in our history. We sort of snuck into what was at the time a relative backwater in the world right around 2004, I think, both of us, and then just kind of hung around.
Jenny Chase
Absolutely. And I can't get another job, so I'm stuck doing solar at Bloomberg NEF now.
David Roberts
Same, we've been doing this for so long now that I couldn't really do anything else, but we just kind of planted ourselves and stuck around until the area we were in suddenly became huge around us.
Jenny Chase
It's a pretty good place to be planted, though. I mean, back in 2004, I was looking at this industry, and I started specializing in solar in late 2005. And I was like, "One day this might be 1% of global electricity supply, but, you know, that's worth working on. Even 1%, it's worth working on if we can make it clean." And last year, it was 5%, and it isn't done growing.
David Roberts
Same, I started covering climate change during the George W. Bush administration. I was like, maybe someday someone will do something about this. Maybe someday we'll pass legislation. And then here we are. PV dominates the world. People are targeting net zero. How things change.
Jenny Chase
Yes.
David Roberts
So I want to ask you, you have been following now the solar industry. I mean, honestly, one of the coolest, most fun, most sort of, like, optimistic of all the dark things h...


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09/20/23 • 61 min
In this episode, organizer Jeff Ordower of 350.org talks about how the environmental movement can shift its focus from blocking what it doesn’t like to building what it does.
Text transcript:
David Roberts
It is a much-discussed fact that the environmental movement cut its teeth blocking things — mines, pipelines, power plants, and what have you. It is structured around blocking things. Habituated to it.
However, what we need to do today is build, build, build — new renewable energy, batteries, transmission lines, and all the rest of the infrastructure of the net-zero economy. Green groups are as often an impediment to that as they are a help.
So how can the green movement help things get built? How can it organize around saying yes?
Recently, the activist organization 350.org hired Jeff Ordower, a 30-year veteran organizer with the labor and queer movements, in part to help figure these questions out. As director of North America for 350, Ordower will help lead a campaign focused on utilities standing in the way of clean energy.
I talked with him about organizing around building instead of blocking, the right way to go after utilities, the role green groups can play in connecting vulnerable communities with IRA money, and what it means to focus on power.
All right then, with no further ado, Jeff Ordower of 350, welcome to Volts. Thank you so much for coming.
Jeff Ordower
Thank you so much, David, for having me. I'm excited to be here.
David Roberts
Okay, well, I want to get to 350 and climate activism in a second, but first I'd like to just hear a little bit about your history in activism, which is mainly on the labor side. And what I'd really like to hear, and this is probably like a whole pot of its own, but insofar as you can summarize, I'd love to hear from your perspective when you were working as an organizer in labor. Looking over the fence at climate activism, what was your sort of take or critique like from the labor perspective? What did you think climate activism was doing right or wrong?
Or what did you think you could bring to climate activism from the labor side?
Jeff Ordower
Yeah, I both did labor organizing and I come out of base-building community organizing. I actually come out of the notorious ACORN was where I spent the first half of my organizing.
David Roberts
The late, lamented —
Jeff Ordower
Yeah. So it's very similar. But I started in labor, moved to ACORN very quickly, and then as ACORN was destroyed, both helped to start new community organizing efforts. And then lately, over the last few years have been involved with labor organizing. And it's interesting because I really started tracking what was happening in climate around Copenhagen, which was 2008, 2009, at the same time where ACORN was going through its difficulties. And we were trying to figure out what to build and how to build it and how to build something that was more intersectional. So I was — the personal piece of my story is I was working in St. Louis, which is where I'm from, and part of what we do as community organizers is think about how do we challenge the local power structure?
It's about power and it's about how we build power for folks who don't have the power that they need and help collectively do that. And St. Louis is, like many midwestern towns, is kind of a branch office for many Fortune 500 companies these days. So the most powerful players in the region were coal companies. Peabody Coal was the largest private sector coal company in the world. Arch coal was the second largest in North America.
Both were headquartered in the St. Louis region because it's at the confluence of the Missouri and Mississippi rivers. So, as the only Fortune 500 company in the city limits of St. Louis that was getting tax breaks, there were lots of reasons to fight Peabody and so started on a campaign about that, but there was also this tremendous excitement that was happening. So we were both at the beginning of the Obama administration. There was a time of great hope. For those of us who —
David Roberts
I recall vaguely, vaguely distantly.
Jeff Ordower
Well that's interesting. So, for climate folks, they're like, "Oh, this is not a time of g...

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02/08/23 • 78 min
Will widespread electrification of the US personal-vehicle sector inevitably be accompanied by a huge rise in environmentally destructive lithium mining? Not necessarily, says a new report. In this episode, lead author Thea Riofrancos discusses options for reducing future lithium demand through density, infrastructure, and smart transportation choices.
Text transcript:
David Roberts
The transportation sector is the leading carbon emitter in the US economy, and unlike some other sources, it is on the rise. Decarbonizing it is inevitably going to involve wholesale electrification of personal vehicles. We're going to need lots and lots of EVs.
That’s going to mean more demand for minerals like lithium, which is mined in environmentally destructive ways and almost everywhere opposed by local and indigenous groups.
But lithium can be mined in more or less harmful ways, depending on where and how it’s done and how well it’s governed. And the number of EVs needed in the future — and the consequent demand for lithium — is not fixed. The US transportation sector could decarbonize in more or less car-intensive ways. If US cities densified and built better public transportation and more walking and cycling infrastructure, fewer people would need cars and the cars could get by with smaller batteries. That would mean less demand for lithium, less mining, and less destruction.
But how much less? That brings us to a new report: “Achieving Zero Emissions with More Mobility and Less Mining,” from the Climate and Community Project and UC Davis. It models the lithium intensity of several different pathways to decarbonization for the US personal-vehicle market to determine how much lithium demand could be reduced in different zero-carbon scenarios.
It’s a novel line of research (hopefully a sign of more to come) and an important step toward deepening and complicating the discussion of US transportation decarbonization. I was thrilled to talk to its lead author, Thea Riofrancos, an Andrew Carnegie Fellow and associate professor of political science at Providence College, about the reality of lithium mining, the coming demand for more lithium, and the ways that demand can be reduced through smart transportation choices.
Alright. Thea Riofrancos, welcome to Volts. Thank you so much for coming.
Thea Riofrancos
Thanks for inviting me.
David Roberts
I've been meeting to get you on forever and waiting for the right occasion, and this is just a humdinger of an occasion here, this report. It's right at the nexus of, like, a lot of things I cover a lot, and a lot of things I feel like I should cover more, bringing them together. So before we jump into the details, I just want to take a step back and summarize the report, the framing of the report as I see it, because I've seen and heard some media coverage of the report, and I'm always just a little frustrated by how other journalists cover things.
Thea Riofrancos
Understandably.
David Roberts
It's just this weird oblique... they don't take the time to sort of say, "what is the main thing?" Before getting on into weird little side questions. So I'll just say, as I understand it, the premise of the report here is we need to decarbonize transportation, yes. And electrifying vehicles is a huge and unavoidable part of that and extracting a lot of lithium is an unavoidable part of that. However, and here I will quote the report, "The volume of extraction is not a given. Neither is it a given where that extraction takes place, under what circumstances, the degree of the environmental and social impacts, or how mining is governed."
So the idea here is: yes, we have to decarbonize, we have to electrify, we have to electrify transportation. We need electric vehicles, but there are better and worse ways of doing that, more and less just ways of doing that, more and less lithium-intensive ways of doing that, and we should do it the best way we can. Is that fair?
Thea Riofrancos
That is fair. And you've also quoted one of actually my personal favorite lines of the report, because I agree with you that it really gets at the heart of what our goals are, the kind of questions that we're asking, and also this desire to align goals that might seem in tension with one another, right? Which is r...

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08/21/23 • 31 min
In this episode, Australian comedian Dan Ilic hosts me on The Greatest Moral Podcast Of Our Generation.
Text transcript:
David Roberts
While I was down under in Australia, I appeared on a show called A Rational Fear, a pod about climate change which is, I’m told, the winner of Australia’s Best Comedy Podcast.
More specifically, I appeared on a spinoff show they’re doing called [ahem] The Greatest Moral Podcast Of Our Generation, a series of interviews with climate types hosted by comedian and journalist Dan Ilic.
It was short, and fun, so I figured, why not share it with the Volts audience? Enjoy, and do check out A Rational Fear some time — it’s quite delightful.
Dan Ilic
I'm recording this on the land of the Gadigal people of the Eora Nation, and I encourage you all to think about whose land you're on and the wealth of the life that you enjoy on that land and why you enjoy it. As we head into this referendum month, I think it's all upon us all to kind of think about listening more. And if you don't know what the Voice Referendum is all about, go and find out. Let's try listening.
David Roberts
Despite global warming, A Rational Fear is adding a little more hot air with long form discussions with climate leaders, good and bad.
Intro
This is coal, don't be afraid. The — heat waves and drought — Greatest — mass extinction — Moral — we're facing a manmade disaster — Podcast — they're the climate criminals — of Our Generation. All of this with the global warming and that a lot of it's a hoax. The Greatest Moral Podcast of Our Generation. GMPOOG for short.
Dan Ilic
Every now and then, the A Rational Fear podcast turns green. We talk to someone who is super interested and who lives and breathes climate on a podcast I like to call The Greatest Moral Podcast of Our Generation, or GMPOOG for short. And I'm excited for you all to meet our next GMPOOG guest. Since about 2015, I have been following his writing on Vox.com and the Grist, but in more recent years, I've been listening to his podcast and reading along with his newsletter. It is Volts, or rather the presenter and the writer of Volts podcast, David Roberts. Welcome to A Rational Fear.
David Roberts
So glad to be here.
Dan Ilic
Or welcome to The Greatest Moral Podcast of Our Generation.
David Roberts
Yeah, I'm not sure I can keep that acronym in my head.
Dan Ilic
Well, the first guest on The Greatest Moral Podcast of Our Generation was former Prime Minister Kevin Rudd, who coined the phrase that climate change was the greatest moral problem of our generation. So that's why we called GMPOOG, GMPOOG. You are one of the foremost experts when it comes to climate and energy. I love Volts. I devour it, I listen as often as I can. And for such a complex and often combative topic, quite frankly, your voice is so calming and reassuring.
David Roberts
Thank you.
Dan Ilic
I mean, you could sell anything, which is why you're here today. To sell us on small modular nuclear reactors.
David Roberts
Exactly. And carbon capture and sequestration. That's my thing.
Dan Ilic
Well, it's such a sprawling conversation I'd love to have with you. Let's start there. We do hear a lot from a very small subsection of our politics all about small modular nuclear reactors. In fact, Barnaby Joyce, who at one time was a leader of a party in this country, said, "People aren't talking about the cost of living down at the supermarket. They're talking about small modular nuclear reactors."
David Roberts
Are they?
Dan Ilic
So I want to ask you, David Roberts, is anybody talking about small modular nuclear reactors?
David Roberts
I mean, yes, people are talking and talking and talking about them. The more relevant question is anyone building small modular nuclear reactors? And the answer to that is a big no. So I think they play more of a rhetorical role than an actual physical role in the energy system.
Dan Ilic
Why is there this energy, for better, no pun intended there, around small modular nuclear reac...

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12/27/23 • 68 min
The cement industry, responsible for roughly 8 percent of total global carbon emissions, is notoriously difficult to decarbonize. But a new startup, Sublime Systems, aims to manufacture zero-carbon cement that can easily be substituted for the traditional version. In this episode, Sublime CEO Leah Ellis talks through the company’s vision and process.
Text transcript:
David Roberts:
Of all the so-called “difficult to decarbonize” sectors, cement is among the most vexing. Making cement produces CO2 not merely through fuel combustion (in kilns that reach temperatures of up to 1400 C), but also through chemical processes that split CO2 off from other molecules. It is responsible for roughly 8 percent of total global carbon emissions.
Most gestures at decarbonizing cement to date are fairly desultory — things like adding special additives or injecting a little CO2 when the cement is mixed into concrete. The only widely available method that could theoretically produce no- or low-carbon cement is post-combustion carbon capture and sequestration. And there are plenty of people who would question whether that's actually viable at all, much less widely available, given that it would roughly double operational costs for a cement plant.
There are lots of startups out there attempting to solve this problem (as reported by Canary last month). Perhaps the most intriguing is Sublime Systems, a team that has developed something truly new and exciting: a system for manufacturing cement that requires no high heat (thus no combustion emissions) and uses inputs that contain no carbon (thus no chemical emissions). That makes the cement, at least potentially, not just low-carbon but zero-carbon. What’s more, the company says that, in form and performance, its product is a perfect drop-in substitute for traditional Portland cement, so it wouldn't even require any changes in the construction industry.
A carbon-free drop-in cement substitute — at scale and at competitive cost — would be genuinely transformative. I contacted Sublime CEO Leah Ellis to talk about cement chemistry, the company’s process, and the plan for reaching megaton scale. This one was truly fascinating and educational for me; I think you will really like it.
All right then. Leah Ellis, CEO of Sublime Systems, welcome to Volts. Thank you so much for coming.
Leah Ellis
Thank you so much for having me.
David Roberts
I'm excited today to talk about concrete, everybody's favorite subject. But first I wanted to ask you, I know you and your partner originally were trained as and educated as battery scientists. I'm just curious how you ended up here. What drew you into this area, this problem?
Leah Ellis
Yeah, my co-founder is a professor at MIT, Yet-Ming Chiang, and he's in the material science department, and I'm a chemist by training. I like to think of chemistry as the central science that combines everything from physics to biology. All of the good stuff you can sort of spread into anything from a foundation in chemistry. So I did my PhD in lithium-ion batteries. I worked with a prolific inventor, Jeff Dahn, and after that I wanted to continue working with an inventor. As you may know, in academia, there are so many different styles of research.
I mean, some people like microscopy and mechanisms, but I really like the creative aspect, like discovering something that could be useful or to solve problems. And not many academics and professors think through that lens. So I've always been very lucky to work with prolific inventors, both in my master's and my PhD. So for my postdoc, I sought to work with people who thought like that. So my co-founder, Yet-Ming Chiang at MIT, is a prolific inventor and also a serial entrepreneur. So Sublime is his 7th startup, and five of the previous six have been very successful.
So I didn't join him with the aspiration of becoming a founder. I really knew nothing about entrepreneurship or anything like that, but I did want to invent, and I did love the way he approaches his work from a problem-solving standpoint. So that's what brought us together.
David Roberts
An...

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04/16/25 • 83 min
I'm joined by “Texas Doug” Lewin to unpack the fascinating contradictions of a state that inadvertently became the nation's renewable energy powerhouse through a free market electricity system that its politicians now seem bent on strangling. Bills before the legislature would require solar and wind developers to also build gas plants, impose extreme setback requirements only on renewables, and potentially cripple the state's economy just as data centers drive unprecedented demand growth.
This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.volts.wtf/subscribe

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04/03/24 • 68 min
In this episode, Duncan Campbell of Scale Microgrid Solutions makes the case that distributed energy resources (DERs) — solar panels, EVs, home batteries, etc. — are, thanks to rising electricity demand and constraints on grid expansion, poised for a tsunami of deployment.
This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit www.volts.wtf/subscribe

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02/24/23 • 66 min
Even if greenhouse gas emissions halted entirely right now, we would continue to feel climate change effects for decades due to existing carbon dioxide in the atmosphere — and warming could accelerate, as we reduce the aerosol pollution that happens to be acting as a partial shield. In this episode, Kelly Wanser of nonprofit SilverLining makes the pitch for solar radiation management, the practice of adding our own shielding particles to the atmosphere to buy us some time while we step up our greenhouse gas reductions.
Text transcript:
David Roberts
One of the more uncomfortable truths about climate change is that temperatures are going to rise for the next 30 to 40 years no matter what we do, just based on carbon dioxide already in the atmosphere and the reduction of aerosol pollutants that are now shielding us from some of the worst of it. That's going to bring about potentially devastating changes that we do not yet well understand and are not prepared for.
How can that short-term risk be mitigated? One proposal is to add particles to the atmosphere that would do on purpose what our aerosol pollution has been doing by accident: shield us from some of the rising heat. No one credible who advocates for solar radiation management (SRM) believes that it is a substitute for reducing greenhouse gas emissions. Instead, it would be a way to buy a little more time to reach zero carbon.
My guest today, Kelly Wanser, is the head of a non-profit organization called SilverLining that advocates for research and policy around near-term climate risks and direct climate interventions like SRM that can address them.
I've long been curious about — and wary of — solar radiation management, so I was eager to talk to Wanser about the case for SRM, what we know and don't know about it, and what we need to research.
Okay then. Kelly Wanser of SilverLining, welcome to Volts. Thank you so much for coming.
Kelly Wanser
Thank you very much, David. I am a fan and it's a pleasure to be here.
David Roberts
Awesome. Well, I have wanted to do a pod on this subject forever. I'm going to try to be focused, but I sort of have questions that are all over the place, so let's just jump right in. The way I'm approaching this is, I think, to average people off the street, and maybe I even include myself in this. The idea of reaching up into the atmosphere and fiddling with it directly, thinking that we can dial in the temperature we want, strikes me as crazy. And I think that's probably a lot of people's intuitive response. Obviously, you have thought your way past that, going so far as to found an organization designed to advocate for this stuff.
So maybe just tell us a little, to begin with, your personal background and how you came to advocacy for geoengineering, which is not a super crowded field.
Kelly Wanser
I'll say first that you're actually not in the business of advocacy for geoengineering and it will give you some context for how I came to be doing what I do.
David Roberts
Sure.
Kelly Wanser
Really it was about — I was working in the technology sector in an area called IT infrastructure, and that's the sort of plumbing of data in the Internet and was looking at problems like how you keep networks operating. And I started to read about climate change, and I was very curious about the symptoms that we were starting to see in the climate system and where the risk really was. And I started to get to know various senior climate scientists in the Bay Area and other places, and I asked them the question like you might ask, how would you characterize the risk of runaway climate change in our lifetime? And this is maybe twelve years ago.
And they said, "Well, it's in the single digits, but not the low single digits."
David Roberts
Not super comforting.
Kelly Wanser
Yeah, I mean, my original degree was economics, so I thought, well, if you had those odds of winning the lottery, you'd be out buying tickets. If you had those odds of cancer, you'd be getting treatment. So that seemed like a really high risk to be exposed to. And then they told me about another feature of what was happening in that carbon dioxide stays in the atmosphere for a long time, keeping things w...

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How many episodes does Volts have?
Volts currently has 321 episodes available.
What topics does Volts cover?
The podcast is about News, Tech News, Podcasts and Politics.
What is the most popular episode on Volts?
The episode title 'Checking in on solar power' is the most popular.
What is the average episode length on Volts?
The average episode length on Volts is 58 minutes.
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Episodes of Volts are typically released every 5 days.
When was the first episode of Volts?
The first episode of Volts was released on Dec 24, 2020.
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