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AI may be booming, but the real bottleneck to it's growth may be turbines. And if firm power can’t scale fast enough, parts of the energy transition hit a wall.

In this episode, I’m joined by Brad Hartwig, Co-founder and CEO of Arbor Energy, to unpack a part of the climate tech and energy transition story that gets far too little attention: the physical machinery needed to deliver reliable, round-the-clock power. Arbor is developing modular supercritical CO2 turbines with integrated carbon capture, aimed at tackling one of the hardest problems in decarbonisation: how to provide firm, scalable electricity while still driving emissions reduction and keeping net zero in view.

We dig into why turbine shortages are becoming a serious constraint on hyperscale data centres, utilities, and industrial electrification, and you’ll hear why Brad believes this is now a critical choke point for both AI infrastructure and climate progress. You might be surprised to learn how stretched the traditional turbine supply chain has become, and why legacy manufacturers may be structurally mismatched to meet the moment.

We also get into oxy-combustion, methane leakage, biomass, carbon sequestration, long-duration storage, and the awkward reality that wind, solar, batteries, and grid expansion, while essential, may still leave gaps when it comes to firm power. This is a grounded conversation about climate tech, policy, energy transition strategy, and what serious infrastructure thinking looks like when the easy slogans run out.

🎙️ Listen now to hear how Brad Hartwig and Arbor Energy are rethinking firm power for a faster, tougher, more honest climate transition.

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What if one of the biggest climate problems in our buildings isn’t power generation, but the fact we’re still burning fuel in the basement?

In this episode, I’m joined by Dan Yates, CEO of Dandelion Energy, to unpack why geothermal may be one of the most overlooked tools in climate tech today, and why building decarbonisation deserves far more attention in the wider energy transition debate. If we’re serious about net zero and real emissions reduction, we need to stop treating heating as a side issue. 

Dan lays out a blunt truth: heating and cooling account for the vast majority of emissions from buildings, yet much of the conversation still fixates on EVs, solar, and batteries. You’ll hear why some forms of electrification can create a nasty unintended consequence by driving winter peak demand through the roof, and why geothermal flips that logic on its head. We dig into how ground-source systems can cut energy use, slash peak load, and potentially reduce the need for expensive new grid infrastructure. 

You might be shocked to learn that this isn’t just an HVAC story. It’s a grid story. A policy story. A housing story. We also get into cost, leasing, incentives, data, and why Dan believes geothermal should be seen as distributed infrastructure hiding in plain sight. If you want a clearer view of what practical climate action looks like beyond the usual talking points, this one’s worth your time. 

🎙️ Listen now to hear how Dan Yates and Dandelion Energy are pushing a smarter, more strategic path to decarbonisation.

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• Anita Krajnc
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• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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What if the real barrier to climate action isn’t a lack of science, but a lack of pressure? And what happens when climate risk collides with political instability, fossil fuel dependence, and public anger in real time?

In this episode, I’m joined by Professor Dana Fisher of American University, author of Saving Ourselves and one of the sharpest thinkers on climate activism, policy, and public mobilisation. We get into what she calls apocalyptic optimism: being brutally honest about the scale of the climate crisis, the democratic backsliding around it, and the need to act anyway. Because the stakes now are painfully clear. Emissions are still rising, climate impacts are becoming impossible to ignore, and the push for decarbonisation is being slowed by vested interests just as the cost of delay keeps rising.

You’ll hear why Dana argues that science is necessary but insufficient for decision-making, and why public pressure is so often the real driver of climate policy, decarbonisation, and net zero progress. We dig into how repression can backfire, why climate shocks can shift public opinion, and why attempts to slow climate action may end up intensifying the response instead.

We also explore why this conversation feels especially urgent now. As conflict, energy insecurity, and policy disruption expose the fragility of fossil fuel dependence, the case for clean energy starts to look less like idealism and more like common sense. From balcony solar to broader questions of power, protest, and public pressure, this episode looks at why the energy transition is about far more than technology. It’s about resilience, accountability, and who gets heard when the system is under strain.

Dana's newsletter is at: https://danarfisher.com/apocalyptic-optimist/
And you can find her TED talk at: https://go.ted.com/danarfisher 

🎙️ Listen now to hear how Dana Fisher reframes climate action, public pressure, and the real forces that move decarbonisation forward.

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• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
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• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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What if the biggest climate lever in fashion isn’t better materials, but simply wearing clothes longer?

The fashion industry accounts for roughly 10% of global carbon emissions and 20% of industrial water pollution. In this episode of Climate Confident, I’m joined by Phoebe Tan, co-founder of Taelor, a menswear rental subscription service using AI-driven styling and real-world garment data to rethink how we consume clothing. The challenge isn’t just fabric choice. It’s overproduction, underutilisation, and a system optimised for churn instead of longevity.

We dig into how rental models can increase garment utilisation and reduce emissions by extending lifecycle wear. You’ll hear why durability data, wear rates, damage rates, wash cycles, may be more powerful than sustainability marketing. Phoebe explains how Taelor feeds performance insights back to brands, effectively becoming a live testing lab for quality and circularity. And we explore a hard truth: convenience often drives behaviour change faster than climate messaging ever will.

If net zero requires rethinking consumption systems, fashion is a revealing case study. This isn’t about trends. It’s about utilisation density, supply chain feedback loops, and whether circular fashion can scale beyond a niche audience.

🎙️ Listen now to hear how Phoebe Tan and Taelor are challenging overproduction and pushing practical decarbonisation in climate tech and the energy transition.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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Coal produces 4,000–8,000x more waste per MWh than wind.
But you can’t take a photo of CO₂, so we ignore it.

In this episode, I’m joined by climate futurist and long-term decarbonisation modeller Michael Barnard. We cut through headlines to examine where the energy transition is actually heading - from electrification and maritime shipping to mass timber, industrial relocation, and grid efficiency. The stakes? Whether we build a cheaper, cleaner energy system, or cling to fossil-era assumptions.

You’ll hear why electrifying everything could cut primary energy demand by up to half.
We dig into how 40% of global shipping may simply disappear as fossil fuel trade declines.
And you might be shocked to learn why solar panels and wind turbines create thousands of times less waste per MWh than coal, yet attract far more outrage.

We also explore how cheap renewables are reshaping industrial geography, why Spain’s sunshine could outcompete former gas hubs, and how making electricity cheaper than fossil fuels changes everything.

Interestingly, Seville’s iconic wooden “Setas” isn’t just architecture, it’s proof that mass timber can replace steel and concrete at scale, locking carbon into buildings instead of the atmosphere.

This is climate tech grounded in physics, economics, and human behaviour, not hype.

🎙️ Listen now to hear how Michael Barnard reframes decarbonisation, net zero, and the real trajectory of the energy transition.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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AI’s energy demand isn’t a future problem. It’s straining grids today. And most companies aren’t ready.

In this episode, I’m joined by Beatrice Clark, Vice President of Sustainability and Social Impact at Turtle and Hughes, a North American electrical distributor and systems integrator working at the sharp edge of the energy transition. We unpack what surging AI and data centre growth means for infrastructure, resilience, and real-world decarbonisation - not in theory, but on the ground.

You’ll hear why energy demand from AI is now “on the tip of everybody’s tongue”, and how utilities and independent producers are scrambling to keep up. We dig into the tension between diesel reliability and microgrid ambition, and why hybrid redundancy may be the uncomfortable truth of the transition. You might be surprised to learn how fleet electrification looks when you’re moving heavy loads across unpredictable routes. It’s not ideology. It’s maths, logistics, and physics.

We also explore double materiality, Scope 3 collaboration, and why sustainability only works when it strengthens operational performance. Net zero isn’t achieved in PowerPoint. It’s delivered through infrastructure, policy, and accountability across the value chain.

If you care about climate tech, grid transformation, emissions reduction, and what decarbonisation actually looks like inside energy-intensive businesses, this conversation cuts through the noise.

Listen now to hear how Beatrice Clark and Turtle and Hughes are navigating the hard realities of the energy transition.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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What if the biggest mistake in climate action is that we’re still designing buildings for a climate that no longer exists?

In this episode of the Climate Confident Podcast, I’m joined by David Sellers, principal architect at Hawaii Offgrid Architecture & Engineering. David designs net-zero and off-grid buildings on Maui, not as an experiment, but because the climate he’s designing for is already shifting. Faster than most regulations, models, or assumptions can keep up.

Buildings account for a huge share of global emissions, energy demand, and climate risk. Get the design wrong today, and we lock in higher emissions, higher costs, and lower resilience for decades. This conversation is about how to stop doing that.

We dig into why designing with historical climate data is quietly undermining net zero goals, and why buildings completed today will spend most of their lives in a climate no human has experienced before. David explains how shifting wind patterns, rising temperatures, water scarcity, and fire risk are already breaking “best practice” design rules.

You’ll hear why off-grid no longer means uncomfortable or compromised, and how advances in solar, batteries, heat pumps, and building envelopes have changed the economics completely. We also talk about fire-resistant construction after the Lahaina fires, reusing waste surfboard foam to create ultra-insulated building blocks, and why resilience that only the wealthy can afford isn’t resilience at all.

This is a grounded, experience-driven look at climate tech, decarbonisation, and the energy transition, without the fantasy timelines or glossy nonsense.

🎙️ Listen now to hear how David Sellers is rethinking buildings for a future climate we can no longer ignore.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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If you liked this show, please don't forget to rate and/or review it. It makes a big difference to help new people discover the show.

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Heating cities by opening windows is not a joke. It’s how many buildings still control temperature in winter, and it’s a climate disaster hiding in plain sight.

In this episode, I’m joined by Drew Maggio, Technical Director at Highmark Building Efficiency, to unpack why buildings are one of the biggest, most underestimated levers in the climate transition, especially in dense cities like New York.

Buildings account for roughly 70% of New York City’s emissions, yet much of the stock was designed for an era of cheap fossil fuels, crude controls, and worst-case thinking. Drew works at the sharp end of fixing that. We talk about what actually breaks when you try to electrify old buildings, and why bad assumptions, not bad technology, are slowing progress.

You’ll hear why oversizing heat pumps for rare freezing days drives up costs and kills projects. We dig into how treating heat as a resource, not waste, unlocks massive gains, from wastewater heat recovery to capturing subway heat that currently just bakes tunnels to 100º F. And you might be surprised by how much energy can be recovered before it ever leaves a building.

We also get into Local Law 97, New York’s landmark building emissions regulation, and why it’s forcing real-world change instead of glossy pledges. This is a grounded, practical conversation about decarbonisation, climate tech, policy, and the uncomfortable reality that many “heritage” systems are simply uncontrolled systems we’ve tolerated for too long.

🎙️ Listen now to hear how to turn building decarbonisation from a compliance headache into a genuine climate solution.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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Europe is drowning in cheap clean power, and still wasting it.
The problem isn’t renewables. It’s what happens when the grid can’t cope with abundance.

In this episode of the Climate Confident Podcast, I’m joined by Oonagh O’Grady, Vice President of International Origination at Hydrostor, a global leader in long-duration energy storage. We dig into one of the most under-discussed blockers of the energy transition: what happens after wind and solar scale, but before the grid is ready.

Oonagh explains why short-duration batteries, while essential, aren’t enough once renewables reach 40–50% of the system. We unpack why grids are hitting curtailment, negative pricing, and instability, and why eight to twenty-four hours of long-duration energy storage is fast becoming the backbone of a reliable, net-zero power system.

You’ll hear why advanced compressed air energy storage can deliver fossil-free, utility-scale flexibility for decades, how it compares with batteries and pumped hydro on cost and performance, and why inertia and grid stability are suddenly back in the spotlight after recent European outages. We also get into the policy side: what leading regions like California, Australia, and the UK are getting right, and what Europe must do now if it wants secure, affordable, decarbonised electricity in the 2030s.

This is a grounded, evidence-led conversation about climate tech that actually works at scale - and a reminder that without long-duration storage, the energy transition stalls just when it should be accelerating.

🎙️ Listen now to hear how Hydrostor and long-duration energy storage can unlock the next phase of the energy transition.

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I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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Europe doesn’t have a clean energy problem. It has a grid problem.
Solar is cheap. Batteries are scaling. Demand is exploding. The system in the middle is cracking.

In this episode, I’m joined by Rob Stait, Managing Director of Alight’s behind-the-meter business, to unpack why the energy transition is now being held back less by technology and more by infrastructure, regulation, and outdated thinking. Alight develops and owns onsite solar and battery systems for large energy users across Europe, using long-term PPAs to lock in savings, cut emissions, and build resilience.

We dig into why waiting for cheaper solar or batteries is often the wrong call, and why businesses that move early gain a structural advantage. You’ll hear how behind-the-meter solar and battery storage bypass grid bottlenecks entirely, why blaming renewables for blackouts misses the real issue, and how decentralised generation is reshaping energy security, affordability, and decarbonisation all at once.

We also explore the uncomfortable reality facing Europe’s grids, the growing role of data centres and electrification, and why microgrids are starting to look less like an edge case and more like the logical endgame of the energy transition. This is a grounded conversation about climate tech that works, emissions reduction that scales, and why net zero will be built through economics as much as policy.

🎙️ Listen now to hear how Rob Stait and Alight Energy are helping turn clean energy from a grid liability into a competitive advantage.

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• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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8% of global emissions come from the material we barely talk about.
Concrete. Cement. The literal foundations of modern life, and one of the hardest climate problems we face.

In this episode, I’m joined by Ana Luisa Vaz, VP of Product at Paebbl, to unpack why construction is such a stubborn emissions hotspot, and what it would take to genuinely change that.

Ana explains why cement emits CO₂ by design, not by accident. Half its emissions come from chemistry, not fuel. You can electrify kilns and still be stuck with the carbon. That’s why Paebbl is taking a different path: using accelerated mineralisation to turn captured CO₂ into a cement substitute, permanently locking carbon into concrete itself.

We dig into what “permanence” really means in carbon removal, why performance matters more than good intentions, and how conservative industries like construction can adopt new materials without compromising safety. You’ll hear how Paebbl can already replace up to 30% of cement today, why cost curves matter more than green premiums, and how digital tools, sensors, and models are accelerating learning in an industry that usually moves at a glacial pace.

We also explore the role of policy, public procurement, and cities, the uncomfortable changes the sector needs to unlearn, and whether carbon-negative construction is a realistic goal this century, or just another climate promise that collapses under scrutiny.

This is a conversation about climate tech that lives in the physical world. Hard to abate. Harder to ignore.

🎙️ Listen now to hear how Ana Luisa Vaz and Paebbl are rethinking concrete, permanence, and what real decarbonisation looks like at scale.

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Podcast subscribers
I'd like to sincerely thank this podcast's amazing subscribers:

• Anita Krajnc
• Cecilia Skarupa
• Ben Gross
• Jerry Sweeney
• Andreas Werner
• Stephen Carroll
• Roger Arnold

And remember you too can Subscribe to the Podcast  - it is really easy and hugely important as it will enable me to continue to create more excellent Climate Confident episodes like this one, as well as give you access to the entire back catalog of Climate Confident episodes.

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If you have any comments/suggestions or questions for the podcast - get in touch via direct message on LinkedIn. 

If you liked this show, please don't forget to rate and/or review it. It makes a big difference to help new people discover the show.