The Energy Transition Show with Chris Nelder

Most people probably think of a “microgrid” as a campus or neighborhood that can “island” itself and run independently when needed, but otherwise stays connected to the main grid most of the time. But in Alaska’s remote communities that aren’t even accessible by road, residents depend on microgrids for their very survival in extreme conditions. For this episode, Chris traveled to Kotzebue, Alaska, a community above the Arctic Circle that has become an international leader at integrating renewable energy by pioneering wind-diesel hybrids, innovative wind-to-heat technology, and Arctic solar systems that achieve remarkable performance. We explore how Kotzebue is using innovative approaches to energy transition solutions to lessen their dependence on diesel fuel while improving the health and welfare of their people. This episode is part of our miniseries about the energy transition in Alaska.

In October 2024, Chris visited the world’s first all-electric farm while traveling across New Zealand. In today’s episode, we speak with the farm’s owner and founder, Mike Casey. In addition to operating the farm, Mike is CEO of Rewiring Aotearoa, a sister organization to Rewiring America. Rewiring Aotearoa works to advance New Zealand’s energy transition by encouraging residents to deploy renewables and export excess power to the grid, and to replace their fossil-fueled machines with electric ones. Mike travels extensively across Australia, New Zealand, and major cities across the globe as an evangelist for electrification, encouraging communities to electrify and go solar. His farm serves as a real-world demonstration of these principles in action. Because Mike’s work is so inspirational and universal, we’re making this episode one of our occasional lagniappe shows, available in front of the paywall for all listeners to enjoy in full. We invite you to share this episode widely! And we hope Mike’s inspiring message of electrification and transition will inspire you to support the show and explore more stories like this in our members-only back catalog.

In the summer of 2025, Chris traveled to Alaska to explore the state’s unique energy transition story by interviewing some of its energy experts. Like every place, Alaska has a unique set of challenges and opportunities in the energy transition, and can offer insights drawn from its experience to the rest of the world. Alaska’s extreme conditions and remoteness make it a proving ground for a wide array of energy transition solutions, as it grapples with a melting permafrost, supply chain constraints, dependence on federal support, and declining fossil fuel production in an age of climate change and climate action. The state’s greatest energy need is for heat during its long, very cold winters that typically last eight to nine months. In this conversation, Aaron Cooke, an architect and project manager at NREL’s Alaska Campus in Fairbanks, joins us to discuss the lab’s research on building techniques designed to retain warmth while ensuring healthy indoor environments. Their work tests designs to construct buildings that are comfortable, healthy, durable, and affordable in harsh climates, all while contending with logistical challenges, cultural needs, and climate adaptation.

This episode cuts through the noise around energy transition progress with hard data from one of the year’s most important reports. Despite claims from both “fossil gradualists” who would like to see the energy transition fail, and “net-zero puritans” who deny that the energy transition is happening at all because emissions are still rising, the transition is very much under way and gathering momentum. Countries are switching to renewables, electrifying transportation and decarbonizing heating faster than even the most seasoned energy analysts thought was possible, while the fossil fuel holdouts still white-knuckling their strategies are quickly dwindling in number. Ember, a clean energy think tank, published a report in April titled Global Electricity Review 2025 that plainly lays out these facts. One of its lead authors, Nic Fulghum, joins us to discuss the report’s findings in a conversation absolutely packed with the data you can use to win any debate with a transition denier. Nic outlines how solar is growing faster than any energy source in human history, electrification of transport and heating are advancing quickly enough to materially slash fossil fuel demand, and power generation from fossil fuels is headed into structural decline. Global power-sector emissions may finally be close to peaking, thanks to the accelerating energy transition.

Mike Grunwald, a veteran reporter and author of 'We Are Eating the Earth,' dives deep into the truths about bioenergy. He questions whether biofuels like ethanol and biodiesel truly offer carbon-neutral benefits, especially when it comes to land usage and deforestation. Grunwald shares insights from his global research, revealing that many bioenergy solutions have unintended consequences that undermine their environmental claims. The conversation also highlights the political dynamics influencing biofuel policies and challenges the narrative surrounding agricultural practices and climate change.

On April 12, the British government took control of British Steel under an emergency authorization in order to prevent its last blast furnace from shutting down. Blast furnaces produce primary steel from iron ore and account for about 93% of global primary iron production, but they also generate large amounts of CO2. Alternative, low-carbon technologies are expected to replace them as the energy transition proceeds. But retiring a technology—especially one as critical to national security as steelmaking—and replacing it with another is a process that should be conducted carefully and deliberately…not on an emergency basis. This kind of “mid-transition” problem is one our guests have studied in depth. Emily Grubert is an Associate Professor of Civil and Environmental Engineering and Earth Sciences at the University of Notre Dame who previously joined us in Episode #185 to discuss the mid-transition. Joshua Lappen is a historian and engineer working as a postdoctoral research associate with Emily at Notre Dame. In this conversation, we review the facts of the British Steel takeover, including why letting the blast furnace shut down was deemed to be an unacceptable risk. We examine the options for decarbonizing steelmaking that will eventually displace blast furnace technology. And we consider what impact Trump’s global tariff war may have on the transitioning of steelmaking, and what some of the geopolitical implications of that may be for the steel industry in Britain, and the world.

This episode is the final part in our miniseries about Australia’s energy transition. In late 2024, Chris traveled to Australia and recorded interviews with a wide range of experts who are intimately involved in the energy transition there. We featured some of them in the earlier episodes of this miniseries, namely, Episodes #234, #235, #246, #247, and #249. In this episode, we take a close look at South Australia, where rooftop solar alone already powers the entire state grid at times. By 2027, South Australia plans to operate with 100% variable renewable energy, making it the first gigawatt-scale grid in the world to achieve this milestone. The challenge? SA Power Networks, the distribution grid operator, doesn’t control generation, transmission, or metering, and doesn’t buy or sell electricity. This means South Australia must figure out how to maintain a stable, reliable grid consisting largely of customer-owned energy resources. In this conversation, James Brown, Head of Network Strategy at SA Power Networks, explains how his team of engineers and stakeholders are finding innovative solutions to meet this challenge. Their approaches will offer valuable lessons for grids worldwide as they, too, transition to electricity systems almost entirely powered by variable renewables.

Three years after Russia’s invasion of Ukraine and the resulting Western sanctions, the country remains an oil and gas powerhouse. Despite falling from the world’s second-largest to third-largest global oil producer and seeing its export rankings decline, Russia continues to delay the global energy transition as a major fossil fuel supplier and geopolitical force. Western observers often struggle to understand Russia’s future role in energy geopolitics and the intentions of President Vladimir Putin. To shed light on these questions, we welcome back Thane Gustafson, Professor of Government at Georgetown University and a leading authority on Russian political economy. He is the author of many books, notably Klimat: Russia in the Age of Climate Change, which we covered at length in Episodes #162 and #163. In this nearly two-hour conversation, we explore his newest book, Perfect Storm—Russia’s Failed Economic Opening, the Hurricane of War and Sanctions, and the Uncertain Future. Gustafson carefully explains how Russia’s post-Soviet reopening to the West failed, how the Crimea occupation precipitated that failure, and where Western sanctions have succeeded or failed in containing Putin’s ambitions. We examine Russia’s oil and gas resources, infrastructure, business capacity, and the evolving relationships between Russian oligarchs and Western governments. The discussion reveals how Russia has evaded energy export sanctions, unpacks Putin’s motivations, and assesses Russia’s fading fortunes as global energy transition efforts accelerate.

This episode continues our miniseries on Australia’s energy transition. In late 2024, Chris traveled to Australia and recorded interviews with a wide range of experts who are intimately involved in the energy transition there. Previous episodes in this miniseries are Episode #234, Episode #235, Episode #246, and Episode #247. In this episode, we feature three researchers and entrepreneurs in Australia who are advancing solar technology research and development: Martin Green, Professor at University of New South Wales, Sydney and Director of the Australian Centre for Advanced Photovoltaics. Craig Wood, CEO of Vast Energy, a concentrated solar thermal power (CSP) company. Richard Payne, CEO of RayGen, a concentrated solar PV and solar thermal company. In the next and final episode in this miniseries, we’ll take a close look at how one Australian state is solving the challenges of knitting together customer-owned systems into a reliable power grid.

Although geothermal power plants have operated commercially in various parts of the world for decades, the sector hasn’t attracted the investment needed to reduce costs and enable global deployment. But with further development, new methods of harnessing geothermal energy to produce heat and electricity could deliver as much as 800 GW of geothermal power capacity worldwide by 2050. That’s equivalent to the electricity demand of the United States and India combined. In December 2024, the International Energy Agency (IEA) published “The Future of Geothermal Energy,” a report exploring opportunities in this sector. Our guest today is a lead author of that report. In this conversation, Heymi Bahar, Senior Renewable Energy Analyst with the IEA, discusses geothermal energy’s full technological potential and strategies for unlocking investment in this promising resource.