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[Episode #274] – Global Electricity Review 2026

Apr 22 2026

Mini Episode

For years, transition skeptics have argued that what's really happening globally is "energy addition," where renewables are piling on top of fossil fuels rather than pushing them aside. The data that's just landing from 2025 finally puts that argument to rest.

For the first time, global electricity generation from fossil fuels fell, not because of a pandemic shutdown, recession, or unusual weather, but simply because renewables grew faster than demand. Power-sector emissions dropped along with it, also a first. Solar recorded the largest single-year increase of any electricity source on record, with the exception of coal's rebound as the world re-opened after 2020. And renewable generation surpassed coal in the modern era for the first time.

These are just a few of the important findings in Ember's Global Electricity Review 2026. To unpack what they mean, and what they don't, we welcome back to the program Nicolas Fulghum, Senior Energy and Climate Data Analyst at Ember and one of the report's lead authors. Nic was last on the show in Episode #254 reviewing the 2025 edition of this report, which became our most popular episode of the year, and which we re-released without paywall in Episode #266.

In today's show, we'll see how the structural decline in fossil generation, long-anticipated by transitionistas, finally arrived. We'll hear why solar's growth rate refuses to slow even as the technology matures. And we'll explore how the second fossil fuel shock of the decade, this time from the Iran war we covered in Episode #272, is pushing more countries to accelerate their move off imported fuels. The energy transition isn't coming. It's here, and it's getting more unstoppable every year.

Guest:

Nicolas Fulghum is a Senior Energy and Climate Data Analyst at the global energy think Ember, and one of the lead authors of Ember’s flagship report – the Global Electricity Review.

On Bluesky: @nicolasfulghum.bsky.social

On LinkedIn: https://www.linkedin.com/in/nicolas-fulghum/

On Twitter: @nicolasfulghum

Geek rating: 8

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[Episode #273] – Solar and Batteries Can Power the World

Apr 8 2026

Mini Episode

In the sunniest parts of the world, solar and batteries are already the cheapest way to build new power generation capacity on an unsubsidized full system cost basis, and that cost advantage is expanding quickly.

By the end of this decade, solar and batteries could affordably supply 90% of electricity for most of the world's population at less than €80/MWh—that's a full system cost, including fuel-based backup, for about US 8.7¢/kWh. While this is already cheaper than building a new gas-fired grid, given that European gas prices spiked to ten times their normal level during the 2022 energy crisis and remain volatile today, the gap is only likely to widen.

But beyond 2030—well within the lifetime of any new power generation system built today—solar and batteries will almost certainly be the cheapest, most reliable, and least volatile way to expand a power grid. Doubling down on fossil gas generation under these conditions, as many governments are contemplating, would be a terrible mistake, both economically and geopolitically.

That is the central finding of a model developed by Tom Brown, professor for Digital Transformation in Energy Systems at the Technical University of Berlin. Tom also led the development of the open-source toolbox Python for Power System Analysis (PyPSA), and based this analysis on a blog post titled "Solar and batteries can power the world." If you doubt the conclusions, you can run the model and test the assumptions yourself.

In today's episode, we'll dig into how the model works, what happens when you add wind to the mix, and why battery costs could halve again by 2050, making solar-dominated grids dramatically cheaper than anything we can build with gas. We'll also examine the land question and find that powering the world with solar would take just 0.3% of global land, a fraction of what we currently devote to livestock. And we'll revisit how to meet that last 10% of demand, a topic we last explored in Episode #188 with Paul Denholm of NREL, and hear Tom's case for methanol as a surprisingly practical backup fuel.

Guest:

Dr. Tom Brown is professor for “Digital Transformation in Energy Systems” at the Technical University of Berlin. His group researches future pathways for the energy system, with a particular focus on revealing the trade-offs between energy resources, network expansion, flexibility and public acceptance of new infrastructure. His recent research has emphasised the need for an integrated approach to planning for electricity, heat, and molecules as we head to a net-zero economy. Tom is a strong supporter of openness and transparency in research data and software, with the goal to enable a vigorous public debate on the trade-offs necessary to reach climate neutrality. He led the development of the widely-used open-source toolbox Python for Power System Analysis (PyPSA). Before joining TU Berlin in 2021, he led a Helmholtz Young Investigator Group at the Karlsruhe Institute of Technology. He did his BA and MMath at Cambridge University and his PhD at Queen Mary, University of London.

On the Web:

Personal blog

Department of Digital Transformation in Energy Systems at the Technical University of Berlin

On LinkedIn: Tom Brown

On Bluesky: @nworbmot.bsky.social

On Mastodon: @nworbmot@mastodon.social

Geek rating: 8

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[Episode #258] – Alaska’s Railbelt Utilities

Sep 10 2025

Mini Episode

Alaska is an energy superpower with more untapped renewable resources than most countries. Yet its largest population, in the Anchorage area, faces a real risk of blackouts beginning in 2027 due to declining gas supply from the nearby Cook Inlet gas field, which is likely to force this historical major supplier of oil and gas to import LNG to keep its residents warm and keep the lights on. A key part of getting ahead of the crisis is addressing transmission dysfunction so severe that it turns 6-cent renewable electricity into 20-cent retail power due to 'pancaking' tariffs.

In this episode, we explore Alaska's sole electricity transmission grid, which connects most of the major population centers along what is called the Railbelt. We learn about how Railbelt utilities are part of a system that's overbuilt, unoptimized, unnecessarily expensive, and slow to change. For example, four rural electric cooperatives built more than $1 billion in unnecessary gas generation between 2012-2016 while knowing gas supplies were declining. Despite sitting atop an estimated 18 gigawatts of tidal energy potential in Cook Inlet alone, the four Railbelt cooperatives lack economic dispatch coordination, wasting tens of million annually through inefficient scheduling of gas-fired generation. The Railbelt utilities could transition away from their dependence on gas and toward the vast renewable resources surrounding them, but it would take a kind of political leadership that is currently lacking in the state. We dive into how the regulatory agencies could help Alaska transition to renewables, as well as why they haven't done so thus far.

We also take a quick look at the future of Alaska's famous oil pipeline, the Trans-Alaska Pipeline System (TAPS), and some of the expectations for nuclear power in the state.

This episode is the third and final part of our miniseries about the energy transition in Alaska.

Guest #1:

Chris Rose is the founder and Executive Director of Renewable Energy Alaska Project (REAP), a non-profit coalition of over 60 diverse energy stakeholder organizations working to increase the development of renewable energy and promote energy efficiency across Alaska. REAP has been instrumental in helping to establish and fund clean energy programs and projects across Alaska, including the creation of the state’s Renewable Energy Fund in 2008, the Emerging Energy Technology Fund in 2010, Commercial Property Assessed Clean Energy legislation in 2017 and the formation of the Railbelt’s first regional Electric Reliability Organization in 2020 and state green bank in 2024. Before establishing REAP in 2004, Chris had a private law practice for over a decade that included work in remote Northwest Arctic villages and the mediation of a variety disputes around the state. He has written a monthly opinion column for Alaska’s only statewide newspaper, served on various statewide boards and committees, including the state’s Renewable Energy Fund Advisory Committee. Since 2008, that Fund has granted over $330 million to more than 100 renewable energy projects that today are displacing the equivalent of 30 million gallons of diesel fuel each year. Chris also served on the climate action advisory committees for both Governors Sarah Palin and Bill Walker. He lives 65 miles northeast of Anchorage, where he and his partner grow flowers and enjoy the mountains. In his free time, he loves to cook, walk in the Alaska wilderness and visit ancient cultures around the world. He graduated Phi Beta Kappa from the University of Iowa with a B.A. in Political Science and a Certificate in Global Studies and received his law degree from the University of Oregon, with a Certificate in Environmental and Natural Resources Law.

On the Web:  https://alaskarenewableenergy.org/

On LinkedIn: https://www.linkedin.com/in/chris-rose-69192251/

Guest #2:

Philip Wight is an Associate Professor of History and Arctic & Northern Studies at the University of Alaska Fairbanks.

He is an energy and environmental historian, with a focus on infrastructure, mobility, and climate. He teaches classes in Alaska history, the contemporary history of the circumpolar north as well as energy and climate history.

Wight wrote his doctoral dissertation on the history of the Trans-Alaska Pipeline System. He is currently finalizing a book manuscript, Arctic Artery: The Trans-Alaska Pipeline System and the World it Made, based on his doctoral research. Wight’s more recent research examines the historical electrification of Alaska, including studies which examine generation and transmission on the Railbelt, as well as technological and energy policy innovation throughout the state.

On LinkedIn: https://www.linkedin.com/in/philip-wight-9a90418b/

On Twitter: @PhilWight

On the Web:  Phil’s page at the University of Alaska Fairbanks

Guest #3:

Saqib Javed is a Researcher of Mechanical Engineering working on Applied Research for Communities in Extreme Environments at the National Renewable Energy Laboratory’s (NREL) in Alaska. He has over 18 years of experience in HVAC systems, Geothermal Energy, Ground Source Heat Pumps, Ground Heat Exchangers, Thermal Energy Storage, Environment and Sustainability Interactions, Building Energy Systems, and Engineering Management.

On LinkedIn: https://www.linkedin.com/in/saqib-javed-b10a4239/

On the Web:  Saqib’s page at NREL

On Google Scholar: Saqib Javed

Geek rating: 8

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[Episode #212] – Transition in Eigg

Nov 29 2023

Mini Episode

Twenty-six years ago, on a wee island with just 65 residents off the west coast of Scotland, the seeds of a fascinating energy transition project were planted. That began a long process which ultimately made it possible for the island’s inhabitants to become the world’s first community to launch an off-grid electric system powered by wind, water and solar.

In the Autumn of 2023, Chris traveled to that island—the Isle of Eigg—to see it for himself, and interview some of the key people who were involved in making it happen. You’ll learn all about how it happened and what the island’s residents plan to do next in their pursuit of greater self-determination and self-sufficiency.

This is our second show in the new, place-based format we piloted in Episodes #186 and #187. Instead of exploring a particular topic with one guest who has a noncommercial perspective, as most of our shows have done so far, this new format aims to tell the stories about how the energy transition is proceeding in some of the places Chris is visiting in his ongoing travels as a peripatetic podcaster. There will be more episodes in this format to come, and we hope you enjoy them.

Geek rating: 4

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[Episode #188] – Getting to a 100% Clean Grid

Dec 21 2022

Mini Episode

How much of a role might wind, solar, nuclear, transmission, power plants equipped with carbon capture and sequestration (CCS) technology, or direct air capture of CO2 play on a 100% clean power grid? Which mix of those technologies would provide the cheapest pathways to a clean grid?

And once we have met 90% of the need for grid power with clean generation, what will we need to meet the last 10% of the demand for grid power? Will it be ‘overbuilt’ wind and solar? Dispatchable geothermal, hydropower, and bioenergy generators? Seasonal storage using hydrogen or batteries? Conventional fossil-fueled plants with CO2 capture? Or might it be some mix of flexible demand technologies? Or some or all of the above?

For that matter, how certain can we even be about modeling the possible solutions years or even decades ahead? Are there solutions that might play a large role in the future but that we can’t yet model very well? How confident should we be that whatever the solutions turn out to be, we will end up with not only a grid that is completely free of carbon emissions but also one that is fully reliable?

In this episode, we speak with a senior researcher at the US National Renewable Energy Laboratory (NREL) who has been researching and modeling grid power for many years. In this quite technical discussion, we review two new NREL reports that address these questions and show that producing a 100% clean power grid is not only technically feasible by a variety of pathways but also commercially feasible and ultimately, cheaper than continuing to run the fossil-fueled power grid we have today.

Geek rating: 9

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[Episode #153] – Grid-forming Inverters

Aug 18 2021

Mini Episode

This one is for the power geeks!

As the energy transition proceeds, and grids have to accommodate more and more inverter-based generators like wind and solar systems, how will grid operators maintain system inertia? For that matter…what if we start operating grids without inertia?

One way to manage it is through “grid-forming inverters,” which can generate the necessary signals for conventional grid-following inverters and thus mimic the operation of synchronous generators.

In this episode, we “turn it up to 11” and speak with a researcher who has been exploring these questions at the University of Colorado in Boulder and at the National Renewable Energy Laboratory (NREL), who explains how these resources might work at high penetrations of renewables on power grids, and what kinds of additional research are still needed to transform the grid to one that is friendly to inverter-based resources (or IBRs).

And if you’re not quite ready for such a technical deep dive, try listening to Episodes #119, #126, #94, and #55 (in that order) first, then try coming back to this one.

Geek rating: 11

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[Episode #71] – Australia at the Cutting Edge

Jun 13 2018

Mini Episode

Since we last covered Australia one year ago in Episode 39, a lot has changed…it has deployed the largest utility-scale battery system in the world, made numerous technical upgrades to prevent future outages, and placed some incredible leaders in key agencies where they are working hard to accelerate the country’s energy transition. It is also actively investing in new energy technologies that aren’t even commercial yet, to see how they can perform. In short, Australia is breaking new trail on multiple fronts in energy transition, and demonstrating some truly interesting findings to the rest of the world, for how a grid might function self-sufficiently, at scale, with significant shares of variable renewable power and large battery storage systems.

Our guide to the current state of affairs today is Ivor Frischknecht, a subscriber to this show and the CEO of the Australian Renewable Energy Agency (ARENA). A widely acknowledged expert and innovator in the energy industry, with deep knowledge of the grid’s needs in Australia, and a far-reaching vision for what it can become, he’s one of the top experts on the energy transition Down Under, and can explain it all in a very accessible way.

Geek rating: 6

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[Episode #70] – Who Should Control Wholesale Markets?

May 30 2018

Mini Episode

As older coal and nuclear generators are pushed off the grid by cheaper, nimbler, cleaner renewables and other technologies, the owners of conventional generators are becoming increasingly nervous about their futures, and seeking new ways to protect their legacy assets. From attempting to change market rules or simply pursuing new subsidies, the effort to retire dirty and unwanted old generators and replace them with newer, cleaner sources of electricity faces a series of challenges. And how those challenges are resolved will have broad implications for how the electric grid of the future will operate, and who will own it.

In this episode we take a deep dive into the intersections between federal authority, wholesale markets, and state policies, explore some of the legal questions therein, and try to understand what they suggest about the process of energy transition, and the pathways for unlocking new ways of using energy and designing electricity markets…and yes, this episode definitely deserves its Geek Rating!

Geek rating: 10

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[Episode #69] – Western Grid Regionalization

May 16 2018

Mini Episode

California and 12 other US states, plus parts of Canada and Mexico, are considering whether to expand the California wholesale grid and balancing area to include the entire region, in order to increase the flow of reliable, affordable, and renewable power across the West. This shift to a regional independent system operator, or ISO, would also expand resource flexibility, improve transmission planning and grid reliability, and enable a far larger share of renewable energy across the system. But it’s not without risk: Would a unified Western market kill the market for power projects sold under virtual PPAs outside its borders? Would it give project developers—or even coal plants—operating within the Western grid but outside California a competitive edge over California’s own renewable project developers? Would it become a loophole through which coal power starts being imported into California, after many years of effort trying to get rid of coal in the Golden State? Would California or any of the other Western states lose control over their own power production and consumption? And what about the five states that could join the Southwest Power Pool instead—what will they do?

These are complex questions with no easy answers, but our guest in this episode is an expert on the subject and ably walks us through all the pros and cons…and points the way to a potentially very different future for power markets in the American West.

Geek rating: 8

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[Episode #58] – Solar with Storage

Dec 13 2017

Full Episode

Historically, thermal concentrating solar plants were the only type of solar power equipped with storage. But as cheaper PV systems became dominant, thermal solar plants fell into disfavor. Now solar PV systems are beginning to integrate storage based on lithium-ion batteries, and this storage isn't just used to supply power when the sun is down; it is providing grid stabilization services too, which only adds complexity to an already-complicated picture for the future of storage - confounding attempts to model how much storage we’ll need, and of what kind, and when will we need it. Is a large amount of seasonal storage required on a high-RE grid, as some analysts have suggested? Or will other technologies reduce the amount of storage we’ll need? And can we even forecast that need, years or decades in advance? We’ll delve into all those questions and more in this deep dive into combined solar and storage systems.

Geek rating: 7

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