Dec 11, 2024 · 32m · green-blueprint
A complex path for building heat batteries
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In this episode of The Green Blueprint, Rondo Energy co-founder John O'Donnell shares how the company transitioned from garage experiments with brick heat batteries to commercial deployment at an active refinery and scaling multi-megawatt-hour systems to decarbonize industrial heat.
How this conversation actually went
Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. How this is scored →
The hosts as informed peer 5.0 Guest teaching 3.1 Guest disagreement 0.1 The hosts pushing back 0.2
speaking balance: gold is the hosts, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 21:05 O'Donnell dismisses naive turnkey EPC and premature automation
O'Donnell firmly rejects the conventional idea that novel hardware can be handed off with an IKEA-style instruction book or automated early, arguing founders must manage the construction execution themselves first.
Hardest push from the hosts ▶ 10:31 Pierpoint challenges commercial taxonomy (Storage vs Heat as a Service)Pierpoint directly interrupts the flow to push O'Donnell on how Rondo specifically defines its commercial model, clarifying whether it operates as storage-as-a-service or integrated heat delivery.
Biggest teaching moment ▶ 13:40 O'Donnell educates on fuel volatility risk vs electricity PPAsO'Donnell gives a detailed breakdown of why industrial heat project finance struggles against natural gas price swings, contrasting predictable electricity escalation with volatile fossil fuel floor pricing.
The host holds their own ▶ 10:31 Pierpoint structures and synthesizes industrial adoption requirementsPierpoint demonstrates deep domain expertise by clearly categorizing Rondo's commercial success factors into interface parity, safety isolation, and contract structuring.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | The hosts as informed peer | Guest teaching | Guest disagreement | The hosts pushing back | Why |
|---|---|---|---|---|---|---|
| Garage Experiments and the PAM Cooking Spray Incident | 4 | 2 | 0 | 0 | Laura Pierpoint introduces the episode with narrative context about Rondo Energy's founding. John O'Donnell shares humorous founding anecdotes about early garage experiments using PAM spray as a mold release. | |
| The Industrial Heat Challenge and Rondo Energy's Solution | 4 | 3 | 0 | 0 | Pierpoint and O'Donnell outline the macroeconomic problem of industrial heat decarbonization. O'Donnell explains the core physics and historic 19th-century brick regenerator roots of Rondo's technology. | |
| Partnering with Calgren Renewable Fuels for Commercial Demonstration | 5 | 2 | 0 | 1 | Pierpoint asks an incisive question about the tension between needing a commercial-scale proof point and convincing risk-averse industrial hosts like Calgren. O'Donnell explains the pilot demonstration approach. | |
| Technical Diligence and Commercial Storage-as-a-Service Models | 6 | 3 | 0 | 1 | Pierpoint expertly synthesizes the three pillars of customer adoption (familiar interface, safety, and business model) and presses O'Donnell on how storage-as-a-service differs from heat-as-a-service. O'Donnell elaborates on European utility structures. | |
| Balance Sheet Financing and Fuel Volatility Off-Take Structures | 5 | 4 | 0 | 0 | Pierpoint inquires about project financing and off-take terms. O'Donnell delivers a masterclass on fossil fuel price volatility risk, noting how bankability differs between standard power purchase agreements and volatile industrial natural gas pricing. | |
| Scaling Brick Architecture and Manufacturing Partnership with SCG | 5 | 3 | 0 | 0 | The discussion covers the mechanical engineering decision to scale brick weight from 50 kg to larger multi-hundred-kilogram blocks to minimize construction labor. O'Donnell explains the strategic manufacturing partnership with Siam Cement Group. | |
| Construction Lessons, Mechanical Tolerances, and EPC Strategy | 5 | 4 | 1 | 0 | Pierpoint asks about Rondo's EPC contracting strategy. O'Donnell emphasizes lessons from prior hardware startups about avoiding premature automation and the mistake of thinking one can hand over an IKEA-style instruction manual without doing early construction oneself. | |
| Commissioning 'First Heat' and Real-World Operational Discoveries | 6 | 4 | 0 | 0 | Pierpoint asks about the commissioning milestone of 'First Heat' and probes whether capacity upside came from conservative modeling. O'Donnell shares insights on multiphysics modeling validation and field realities like unexpected manual startup interventions. | |
| Scaling to Hundred-Megawatt-Hour Systems and Key Founder Advice | 5 | 3 | 0 | 0 | Pierpoint asks about scaling to hundred-megawatt-hour systems and lessons learned for climate tech founders. O'Donnell highlights conservative design safety margins and the necessity of insourcing complex structural and balance-of-plant engineering. |
Statements from this episode (15)
O'Donnell: Industrial heat accounts for a quarter of global fuel consumption
“A quarter of all the fuel we burn in the world is for industrial heat.”
O'Donnell: Over half of global industrial heat is delivered as steam
“A little more than half of all the world's industrial heat is delivered as steam because steam is wonderful, energy-dense, easy to move around.”
O'Donnell: Intermittent renewable electricity is cheaper than burning fossil fuels
“It is intermittent electricity that's becoming the cheapest source of energy humans have ever had available. We have now entered this world where, on a primary energy basis, you can have electricity at a lower cost than burning fuel.”
O'Donnell previously failed to pitch concentrating solar to Calgren
“In fact, I had failed previously To come up with something that Calgren found acceptable using concentrating solar technologies.”
O'Donnell: Full Calgren installation will be about 600 MWh
“Step one, this was a pilot for the full-size installation will be about 600 megawatt hours”
O'Donnell: Rondo has caused zero significant outages at Calgren
“Rondo has not caused five minutes of outage for Calgary since we started working there.”
O'Donnell: Rondo is partnering with European utilities on heat-as-a-service
“Now, we have utilities that we're working with at scale in Europe who are combining these things to offer heat as a service to a customer.”
O'Donnell: Rondo Financed Initial Commercial Pilot on Balance Sheet
“Because this one was the size that it was. We financed this on balance sheet.”
O'Donnell: Small Projects Are Extremely Difficult to Finance as Infrastructure
“Small projects, unless they're part of a big project portfolio, are very difficult to finance this infrastructure.”
O'Donnell: Rondo Sold Calgren Heat at a Discount to Gas Prices
“Here, just for simplicity, because it was on balance sheet, we said, fine, we will sell you heat at a discount to whatever the then gas price is.”
O'Donnell: Rondo Brick Storage Holds More Energy Per Kilogram Than Lithium-Ion
“We store a little bit more energy per kilogram than a typical lithium-ion battery pack in brick”
O'Donnell: Fifty-Kilogram Bricks Are Suboptimal for Grid-Scale Thermal Storage Construction
“A 50 kilogram brick is almost perfectly the wrong size. It takes two people to handle it, and there are a lot of them. So to the extent that we could make larger single bricks, we could reduce crane operations or people hours building these things.”
O'Donnell: Rondo Energy Acts as Prime EPC on Early Projects
“In these early projects, we are prime. We are the prime EPC.”