🎙️ Leaders in Cleantech – Episode Notes

Guest Name: Pete Armstrong, CEO/CTO of Mixergy

Episode Summary

This was a conversation I’ve been looking forward to revisiting.

When Pete first came on the podcast back in 2018, Mixergy was an early-stage university spin-out with a big idea; using hot water as a form of energy storage. Listening back now, what’s striking is not just how far the company has come, but how non-linear that journey has been.

At its core, the mission hasn’t changed: unlocking flexibility in the grid through something deceptively simple.

What has changed is everything around it.

A few themes stood out:

Technology vs. reality
The product is clever; smart, stratified hot water tanks coordinated through software. But the real challenge wasn’t building it. It was understanding how products actually get adopted; installers, specifiers, and supply chains matter more than most founders expect.

From chaos to focus
Like many startups, Mixergy tried multiple routes early on. Direct sales, installer networks, merchant channels. The shift to a more focused “spec and tech” model; driven by specification and licensing; feels like a defining moment.

Hidden scale
~9 million hot water tanks in UK homes. Even a fraction becoming “smart” creates meaningful grid flexibility. It’s a good reminder that some of the biggest opportunities in cleantech come from rethinking what already exists.

Leadership and perspective
Pete was candid about the role of investors and experienced operators. Left unchecked, founders can easily chase too many directions. The right board doesn’t just govern; it sharpens focus.

Culture and evolution
From farm-based R&D and a slightly renegade spirit, to a more disciplined, commercially focused organisation. That balance between curiosity and execution is where most companies either break or scale.

Books mentioned

• Predictably Irrational – Dan Ariely
• The Idea Factory – Jon Gertner

Both speak, in different ways, to how innovation actually happens; through human behaviour, systems, and environment; not just technology.

About our Guest

Dr. Pete Armstrong:

Dr.Pete Armstrong is the CEO/CTO and co-founder of Mixergy, a smart hot water technology company

About Hyperion Search:

At Hyperion Search, we specialize in building world-class teams for the cleantech and energy transition sectors. We focus on leadership roles but also recruit strategically critical individual contributors who drive business growth. Whether you’re a founder scaling a startup, a board member guiding a scaleup, a VC/PE investor, or a corporation committed to energy and mobility transitions, we find the talent that will deliver impactful, sustainable results.

• Linked In: https://www.linkedin.com/company/hyperion-search-ltd
• Website: www.hyperionsearch.com

Follow us online, write a review (please) or subscribe

I'm very keen to hear feedback on the podcast and my guests, and to hear your suggestions for future guests or topics. Contact via the podcast Linked In page.

If you do enjoy the podcast, please write a review on iTunes, or your usual podcast platform, and tell your cleantech friends about us. That would be much appreciated.

• LinkedIn: https://www.linkedin.com/in/david-hunt-cleantech/

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Philipp Man – terralayr

In this episode of Leaders in Cleantech, I’m joined by Philipp Man, co-founder and CEO of terralayr, a company building a new kind of energy infrastructure platform focused on flexibility and battery storage. Philipp shares his journey from commodities and entrepreneurship into the energy sector, and the insight that led to terralayr: the growing flexibility gap in power systems as renewable generation scales.

As he puts it:

“We wanted to build something akin to the AWS for power.”

terralayr combines battery asset development with a software platform that virtualises and commercialises storage capacity, enabling customers to access flexibility without owning and operating assets themselves. The conversation explores how this model sits at the intersection of infrastructure and technology — and why that distinction may become less relevant as energy systems evolve.

We also discuss the state of the European storage market. Despite the growing focus on batteries, Philipp is clear that we are still early:

“We’re really just at the beginning… you need to grow over 10x in the next four years.”

From there, we move into some of the real-world constraints holding the sector back — particularly grid access and bureaucracy, and what needs to change to accelerate deployment.

The discussion also touches on broader themes shaping the energy transition, including:

• The role of battery storage in enabling renewable integration
• Why flexibility is becoming a critical part of the energy system
• The shift from asset ownership to access and platform models
• The impact of geopolitics and energy security on policy direction
• The need to reframe the transition around energy sovereignty and abundance

On the talent side, Philipp shares a disciplined approach to building teams, with a strong emphasis on hiring quality over speed and creating a culture where high performers set the standard:

“The most important thing you can control is who comes through the door.”

He also reflects on the realities of building a company in this space, from landmark commercial deals and fundraising milestones to the operational challenges that come with scaling infrastructure.

Finally, we discuss leadership, resilience, and the importance of mindset, seeing challenges not as problems, but as opportunities to build capability and long-term

About Hyperion Search:

At Hyperion Search, we specialize in building world-class teams for the cleantech and energy transition sectors. We focus on leadership roles but also recruit strategically critical individual contributors who drive business growth. Whether you’re a founder scaling a startup, a board member guiding a scaleup, a VC/PE investor, or a corporation committed to energy and mobility transitions, we find the talent that will deliver impactful, sustainable results.

• Linked In: https://www.linkedin.com/company/hyperion-search-ltd
• Website: www.hyperionsearch.com

Follow us online, write a review (please) or subscribe

I'm very keen to hear feedback on the podcast and my guests, and to hear your suggestions for future guests or topics. Contact via the podcast Linked In page.

If you do enjoy the podcast, please write a review on iTunes, or your usual podcast platform, and tell your cleantech friends about us. That would be much appreciated.

• LinkedIn: https://www.linkedin.com/in/david-hunt-cleantech/

Also follow the podcast and to stay up to date.

• LinkedIn: https://www.linkedin.com/company/leaders-in-cleantech-podcast...

In this episode of Leaders in Cleantech, I’m joined by Adrien Pinsard, CEO of Telis Energy, a Carlyle-backed renewable energy platform targeting a 10GW development pipeline across Europe by 2030.

Adrien reflects on nearly two decades in the renewables sector, moving from private equity investor to platform builder and entrepreneur. Before launching Telis in 2022, Adrien spent 14 years investing in renewable projects at Platina Energy Partners and later served as Interim CEO of Macquarie’s 11GW European solar developer, Cero Generation.

We discuss the thinking behind Telis’ decentralised development model, with dedicated local teams operating across the UK, France, Germany and Italy, and how that structure helps navigate the realities of developing infrastructure in different markets. As Adrien explains:

“To be a successful developer, you need a very strong local presence. You have to understand communities and the local market.”

The conversation also explores how the European renewables landscape is evolving. Adrien highlights two key shifts in recent years: the growing saturation of solar in some markets, and the rapidly increasing role of battery storage, driven by falling costs and rising power market volatility.

We also discuss broader themes shaping the next phase of the energy transition, including:

• The changing economics of renewable development
• Why batteries and hybrid energy hubs are becoming central to projects
• How grid constraints are shaping development strategy
• The importance of capital discipline in a tougher investment environment
• The impact of geopolitical volatility on energy security and renewable deployment

Looking ahead, Adrien sees renewables playing an increasingly important role in Europe’s energy resilience:

“Renewables are very well placed to provide energy security. Once the assets are in the ground, they’re homegrown.”

Finally, Adrien reflects on the entrepreneurial journey of building a platform from scratch, and the importance of trust and culture when building teams across multiple markets.

Adrien Pinsard:

Adrien Pinsard has a 17-year track record of renewable energy investment and development.

Prior to founding Telis, Adrien was Interim CEO of the Macquarie Group 11GW European solar energy developer, Cero Generation. Adrien spent 1

About Hyperion Search:

At Hyperion Search, we specialize in building world-class teams for the cleantech and energy transition sectors. We focus on leadership roles but also recruit strategically critical individual contributors who drive business growth. Whether you’re a founder scaling a startup, a board member guiding a scaleup, a VC/PE investor, or a corporation committed to energy and mobility transitions, we find the talent that will deliver impactful, sustainable results.

• Linked In: https://www.linkedin.com/company/hyperion-search-ltd
• Website: www.hyperionsearch.com

Follow us online, write a review (please) or subscribe

I'm very keen to hear feedback on the podcast and my guests, and to hear your suggestions for future guests or topics. Contact via the podcast Linked In page.

If you do enjoy the podcast, please write a review on iTunes, or your usual podcast platform, and tell your cleantech friends about us. That would be much appreciated.

• LinkedIn: https://www.linkedin.com/in/david-hunt-cleantech/

Also follow the podcast and to stay up to date.

• LinkedIn: https://www.linkedin.com/company/leaders-in-cleantech-podcast...