Jan 8, 2025 · 33m · green-blueprint
Building the world’s biggest DAC facility
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gold bands on the timeline = statements, start to end. Hover to read, click to jump. CC turns on captions
In this episode of The Green Blueprint, host Laura Pierpoint interviews Climeworks COO Doug Chan about the engineering, financing, and operational hurdles of constructing Mammoth—the world's largest direct air capture facility in Iceland—and the roadmap to megaton-scale carbon removal.
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 5.1 Guest teaching 3.0 Guest disagreement 0.1 The hosts pushing back 0.1
speaking balance: gold is the hosts, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 28:55 Dismissing competitor concerns in carbon removal
Doug politely brushes aside the premise that competitor saturation is a risk, pointing out there is far more atmospheric CO2 than all existing providers combined can remove.
Hardest push from the hosts ▶ 17:18 Pressing on ongoing operational issues from field fixesLaura directly checks whether the emergency field fixes and retrofits are still causing operational bottlenecks months after commissioning.
Biggest teaching moment ▶ 8:17 Explaining the vicious cycle of CDR project financingDoug explains the structural catch-22 where infrastructure financiers demand long-term offtake contracts while buyers wait for proven operational plants before committing.
The host holds their own ▶ 11:44 Articulating EPC contractor trade-offs for climate techLaura delivers a detailed breakdown of the trade-off between retaining contractor control for agile iterations versus hiring an established EPC firm for investor bankability.
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 |
|---|---|---|---|---|---|---|
| Evolution of Technology: From Capricorn to Orca | 5 | 4 | 0 | 0 | Laura frames the technological transition from Capricorn to Orca, demonstrating solid grasp of the plant lineage. Doug explains the strategic shift from utilization to permanent underground mineralization storage. | |
| Mammoth Plant Overview and Key Engineering Challenges | 6 | 3 | 0 | 1 | Laura drills into project finance mechanics, asking whether Climeworks sought non-recourse debt or relied on balance-sheet financing. Doug details how off-take timing and early market maturity dictated their capital structure. | |
| Execution Strategy: Proprietary IP vs. EPC Contracting | 6 | 3 | 0 | 0 | Laura asks nuanced questions regarding the boundary between proprietary process engineering and external EPC contracting. Doug explains why core hardware design stayed in-house while balance of plant was contracted out. | |
| Field Retrofits and Surviving the Icelandic Winter | 4 | 3 | 0 | 0 | The conversation is highly collaborative as Doug recounts engineering Band-Aids during filter element failures and winter weather disruptions in Iceland, with Laura validating the operational mindset required for hardware startups. | |
| Plant Commissioning and Planning Project Cypress in the US | 5 | 3 | 0 | 0 | Laura asks about commissioning milestones and modular scaling factors. Doug explains the staged rollout of collector modules and early conceptual design work targeting US hub funding. | |
| Scaling to Megatons and Unlocking Market Offtake Demand | 6 | 3 | 0 | 0 | Laura and Doug discuss the economics of scaling to megaton capacity under Section 45Q tax credits and the Bipartisan Infrastructure Law. Doug points to compliance markets as the essential demand driver. | |
| Reflections on Hardware Scaling and Episode Conclusion | 4 | 2 | 1 | 0 | Doug reflects on managing imperfect information in hardware development and notes that money alone cannot substitute for policy frameworks. The host winds down the episode on a warm, reflective tone. |
Statements from this episode (14)
Chan: Climeworks monetizes DAC through long-term CDR offtake contracts
“So the way that the various technology providers, including ourselves, make money is by selling long-term off-take contracts for the CDR, carbon dioxide removal, that we produce, kind of an ironic way to say you produce CDR, Kind of remove CO₂ and store it in …”
Chan: Climeworks pivoted to storage because carbon utilization could not scale
“And the reason we made that second pivot, To direct air capture and storage is that's really what we needed to be able to scale.”
Chan: Net-negative carbon removal requires permanent storage, not reuse
“There's plenty of storage around the world, and ultimately, if we want to be negative in our CO₂ removal, we need to be storing it and not reusing it. Otherwise, it's just kind of a circular economy there.”
Chan: Scaling direct air capture to billions requires non-recourse debt
“As companies look to get to scale, especially in direct air capture, and once you get to like triple digit, or even triple digit millions, or billions of dollars of capex, debt financing, non-recourse financing is, is ultimately going to be needed.”
Chan: CDR buyers waiting for proven deployment creates a vicious cycle
“So, kind of what we're seeing in the industry at the moment is people are kind of waiting to see that CDR can be deployed before they make the commitments as well. So, it's kind of this vicious cycle.”
Climeworks financed Mammoth on-balance-sheet and exceeded typical FID offtake volumes
“So, we still kept it on balance sheet, and actually by the time we did get it built and running, it being mammoth what your typical numbers you would expect for off-take contracts by FID, we'd, we'd well exceeded that.”
Climeworks kept hardware design in-house while EPC built the facility
“So what we did keep in-house was the design of the core hardware, so those collector units that you see, and then also for the process engineering nerds out there, so the core heat and material balance, the process flow diagram, and the process instrumentation…”
Climeworks scaled from eight collector containers at Orca to 72 at Mammoth
“So we're going from now eight collector containers to 72, and then within these containers there's filter elements, which went from hundreds to thousands.”
Climeworks faced premature filter failures during Mammoth's serial production
“The filter element, which is the one that experienced the most design change. We were, while we were testing the prototypes, we actually did see some failures that were earlier than we had expected. And that then comes that decision of, all right, we're also d…”
Climeworks deployed field reinforcements while simultaneously designing collector retrofit packages
“We decided to continue with the ones that were already there and essentially deploy a field patch or a field reinforcement to kind of strengthen the failure mode that we had seen, but then in parallel also work on an improved design as well. So that we could t…”
Chan: Cypress DAC Hub won $50M grant, eligible for $600M
“So we were awarded one of the two. I lose track of all the years now, but it was last year and we've received the first phase of that, which is the fifty million, and then further up to six hundred million once we reach the Discrete milestones in our project d…”
Chan: Corporate offtake demand, not project financing, limits DAC scale
“Yeah, the thing that keeps me up most is definitely that first one that you mentioned, the market and the demand because your second one, like you said, the project financing that will come if the demand is there. So, having more businesses beyond those first …”
Chan: Scaling CDR demand requires compliance markets or government procurement
“And then there's that kind of question of like, hey, what would take that step change up to real demand is probably more of a compliance market or governmental demand as well.”
Chan: Climeworks has moved past FOAK to fourth-of-a-kind DAC plants
“A lot of direct air capture is currently in its first of a kind stage, but we do, and Climax has been able to show that now we're past that original folk valley, and now we're up to a fourth of a kind, which is still a folk, but a fourth, and this should reall…”