CleanTechies Podcast
CleanTechies Podcast

CleanTechies Podcast

The #1 Podcast for ClimateTech Entrepreneurs

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We are CleanTechies, the #1 Podcast for ClimateTech Entrepreneurs. Whether you’re an active ClimateTech entrepreneur, an aspiring one, an investor, a service provider…anything that touches supporting early stage climate tech, this is the place for you. Each week, we publish two interviews with leading experts in the field telling their stories, insights, and advice to help ClimateTech Entrepreneurs like you be inspired by their successes and learn from their mistakes. cleantechies.substack.com

Recent Episodes

#279 They Lost $189m DOE Grant, but Survived. Learn Why | Cody Finke (Brimstone)
MAR 4, 2026
#279 They Lost $189m DOE Grant, but Survived. Learn Why | Cody Finke (Brimstone)
<p><strong>00:00</strong> – Intro: Cody Finke returns to the podcast.</p><p><strong>04:30</strong> – The "Rock Refinery": Moving beyond cement to co-produce aluminum and critical minerals.</p><p><strong>05:39</strong> – The Physics of Scale: Why cost parity is impossible with small reactors.</p><p><strong>08:12</strong> – The History of Co-Production: From whale oil to Standard Oil's catalytic cracking.</p><p><strong>12:39</strong> – "Bad Geologic Luck": Why traditional limestone cement plants can't co-produce.</p><p><strong>18:54</strong> – De-Risking Deep Tech: How Brimstone uses off-the-shelf components to build a massive patent moat.</p><p><strong>28:33</strong> – Fundraising Strategy: Raising ~$90M and executing pilot plants.</p><p><strong>33:44</strong> – PR for Founders: When to stay in stealth and when to reveal your grand vision.</p><p><strong>38:18</strong> – The $189M DOE Grant: Winning the money under Biden, losing it under Trump, and why it wasn't a disaster.</p><p><strong>45:54</strong> – Geopolitics & Manufacturing: Why critical materials and heavy industry must return to democratic countries.</p><p><strong>50:28</strong> – The Ultimate Climate Strategy: Why capitalism only rewards lower costs, not moral outcomes.</p> <br/><br/>This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit <a href="https://cleantechies.substack.com/subscribe?utm_medium=podcast&#38;utm_campaign=CTA_2">cleantechies.substack.com/subscribe</a>
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55 MIN
#276 Digitizing The Paperwork Layer of the Energy Transition | Hudson Hollister (HData)
FEB 4, 2026
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58 MIN
#275 Turning Idle Oil Wells into Gravity Batteries | Kemp Gregory (Renewell Energy)
JAN 28, 2026
#275 Turning Idle Oil Wells into Gravity Batteries | Kemp Gregory (Renewell Energy)
<p>What happens when an oil well dries up? Usually, it becomes a "zombie" liability—leaking methane and waiting to become a taxpayer burden. <strong>Kemp Gregory</strong>, CEO and Co-founder of <strong>Renewell Energy</strong>, joins the show to explain how he’s turning these multi-million dollar liabilities into clean energy assets.</p><p>Renewell converts idle wells into mechanical gravity batteries. By using existing deep wellbores to raise and lower heavy weights, they’ve created long-duration energy storage that is cheaper than lithium-ion and uses the infrastructure we already have.</p><p><strong>Key Takeaways:</strong></p><p><strong>The Problem:</strong> Why the "Orphan Well Pocalypse" is a looming global crisis.</p><p><strong>The Tech:</strong> How gravity storage works and why it doesn’t degrade like chemical batteries.</p><p><strong>The Business:</strong> Convincing oil companies to hand over wells instead of plugging them.</p><p><strong>The Grid:</strong> Why "stranded assets" are actually perfectly positioned for grid stability.</p><p><strong>Building Deep-Tech:</strong> Why "agency" is the #1 trait Kemp looks for in early hires.</p><p><strong>Timestamps:</strong></p><p><strong>01:40</strong> – Kemp’s journey from Oil & Gas to CleanTech.</p><p><strong>05:00</strong> – The Scale: 900k active wells vs. 2 million idle wells.</p><p><strong>14:15</strong> – Gravity storage vs. Lithium-Ion: Cost and mechanics.</p><p><strong>18:00</strong> – Turning abandonment costs into revenue shares.</p><p><strong>40:15</strong> – Hiring for "Evidence of Agency."</p><p><strong>Connect & Links:</strong></p><p><strong>Guest:</strong> <a target="_blank" href="https://www.google.com/search?q=https://www.linkedin.com/in/kempgregory/">Kemp Gregory</a> | <a target="_blank" href="https://www.renewellenergy.com/">Renewell Energy</a></p><p><strong>Host:</strong> <a target="_blank" href="https://www.linkedin.com/in/silasmahner/">Connect with Silas on LinkedIn</a></p><p><strong>Community:</strong> <a target="_blank" href="https://www.google.com/search?q=https://www.linkedin.com/company/cleantechies/">Follow CleanTechies on LinkedIn</a></p><p><strong>Watch:</strong> <a target="_blank" href="https://www.google.com/search?q=https://www.youtube.com/%40cleantechies">Subscribe on YouTube</a></p><p><strong>Our Sponsors:</strong></p><p><strong>Climate Finance Solutions (CFS):</strong> Secure government grant funding with a 90% success rate. <a target="_blank" href="https://climatefinancesolutions.com">Learn more at </a><a target="_blank" href="http://ClimateFinanceSolutions.com">ClimateFinanceSolutions.com</a>.</p><p><strong>ErthSearch:</strong> Specialized CleanTech recruiting. Fast, accurate, and guaranteed. <a target="_blank" href="https://www.google.com/search?q=https://www.erthsearch.io">Get started with Silas today</a>.</p><p><em>Disclaimer: This podcast is NOT investment advice. Please do your own due diligence.</em></p> <br/><br/>This is a public episode. If you'd like to discuss this with other subscribers or get access to bonus episodes, visit <a href="https://cleantechies.substack.com/subscribe?utm_medium=podcast&#38;utm_campaign=CTA_2">cleantechies.substack.com/subscribe</a>
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49 MIN