Oct 12, 2023 · 35m · how-i-built-this
Unlocking the renewable energy revolution with Ramya Swaminathan of Malta Inc.
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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 How I Built This Lab, host Guy Raz interviews Malta Inc. CEO Ramya Swaminathan about pioneering utility-scale molten salt thermal energy storage to resolve renewable intermittency, restore power grid stability, and accelerate global decarbonization.
How this conversation actually went
Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. Guy holds 41.6% of the talking time here. How this is scored →
Guy as informed peer 3.5 Guest teaching 5.0 Guest disagreement 1.1 Guy pushing back 1.4
speaking balance: gold is Guy, purple is the guest (3 minute bins)
Sharpest disagreement ▶ 32:40 Dismissing home and vehicular applications
Swaminathan directly rejects Raz's premise about consumer-scale applications, clarifying that the physics and machinery only make sense at municipal or grid scales.
Hardest push from Guy ▶ 26:05 Pressing on past molten salt project failuresRaz directly challenges Swaminathan on the viability of molten salt by bringing up Crescent Dunes' high-profile 2019 collapse.
Biggest teaching moment ▶ 9:30 The missing mechanical inertia on renewable gridsSwaminathan educates Raz on the unappreciated physical reality of grid inertia and how replacing spinning turbine mass threatens grid stability.
Guy holds their own ▶ 6:25 Detailed explanation of fossil fuel base-load vs renewable wasteRaz lays out a comprehensive technical explanation of continuous thermal power generation versus renewable surplus curtailment.
the scores for every segment, with the reasoning behind each
| Chapter | Topic | Guy as informed peer | Guest teaching | Guest disagreement | Guy pushing back | Why |
|---|---|---|---|---|---|---|
| From Hydrokinetics to Tapping Unpowered American Dams | 4 | 5 | 1 | 1 | Guy Raz demonstrates solid baseline knowledge of hydroelectricity by summarizing the mechanics of river-based turbines. Ramya Swaminathan educates him on the surprising statistic that only three percent of the 79,000 U.S. dams generate electricity. | |
| Project Malta's Origins at Google X and Grid Inertia | 5 | 7 | 1 | 2 | Raz details renewable intermittency and how fossil plants currently run as energy stores. Swaminathan schools him on the deeper engineering challenge: grid inertia and frequency regulation lost when rotating fossil turbines are retired. | |
| Mid-Episode Intermission, Sponsor Messages, and Show Promotion | 0 | 0 | 0 | 0 | Mid-roll break containing promotional announcements and sponsor segments with no conversational tension or substantive exchange. | |
| The Science and Scalability of Molten Salt Thermal Storage | 5 | 6 | 1 | 1 | Raz draws intuitive analogies like salt-baking chicken and lithium-ion limitations. Swaminathan expands on the physics of Robert Laughlin's system, detailing how thermal storage decoupled from power turbo-machinery enables cost-effective long-duration storage. | |
| Commodity Abundance, Robust Supply Chains, and Geopolitical Security | 3 | 5 | 1 | 1 | Raz notes the commonality of salts used for water softening. Swaminathan connects the availability of commodity solar salts to post-Ukraine war geopolitical energy security and supply chain independence. | |
| Integrating Thermal Storage into Legacy Grids and the Workforce | 4 | 6 | 1 | 1 | Raz demonstrates awareness of the fragmented regional nature of the U.S. power grid (e.g., ERCOT in Texas). Swaminathan elaborates on how Malta's thermal asset profile allows utilities to seamlessly transition legacy fossil power station workers without mass displacement. | |
| Distinguishing Malta from Concentrated Solar and Operational Thermal Limits | 4 | 6 | 2 | 3 | Raz pushes on the historical failure of the Crescent Dunes molten salt plant and asks if operational temperatures approach nuclear or volcanic levels. Swaminathan clarifies the distinction between concentrated solar collectors and pure salt loops, explaining that 565°C is actually modest compared to standard gas turbines. | |
| Commercial Deployment Strategy and Energy Market Dynamics | 3 | 5 | 2 | 2 | Raz asks whether this technology could scale down to residential homes or electric cars. Swaminathan gently dismisses the micro-scale premise, clarifying that the thermodynamic economics only make sense at municipal microgrid and utility scales. |
Statements from this episode (13)
Swaminathan: Only 3% of the 79,000 US dams generate electricity
“What we had really understood through the process of you know, and advancing this hydro kinetics business plan was that there's 79,000 dams in the United States, and only three percent of them have power.”
Swaminathan: Time-shifting power is the linchpin to unlocking renewable energy
“The ability to time shift, to take power when it's widely available, so in the middle of a day, for example, at the maximum irradiation, And move that to a time where it's not available, like in the middle of the night when the sun doesn't shine, is in many wa…”
Swaminathan: Malta Inc. originated at Google's X incubator
“They had in-house at X, the Moonshot Factory, what they called Project Malta, which then ultimately became the company I now lead, Malta Inc.”
Swaminathan: Malta's technology replaces grid inertia and time-shifts power
“Malta helps not only time shift that power, as we were talking about moving solar that's available during the day to being available at night, but we're also replacing the inertia, which helps maintain the reliability of the grid.”
Swaminathan: Nobel laureate Robert Laughlin conceived Malta's core technology
“The technical insight that formed the foundation of what Malta's working on today in terms of our technology was actually the brainchild of a professor at Stanford. He's a Nobel Prize winner. His name is Robert Laughlin.”
Swaminathan: Grid lithium-ion storage typically tops out at four to eight hours
“10 hours would be long for lithium ion. So lithium ion actually, yeah, lithium ion actually started really in the one hour space. They've extended to now four hours, and you do see some six, maybe even eight hour applications in the world today for lithium ion…”
Swaminathan: Malta extends storage duration cheaply by adding salt tanks
“Whereas in our system, what you can do is just to add more salt and more coolant. And you extend duration while keeping the power portion of it. That is the machinery, the turbo machinery, the heat exchangers. You keep those all constant, but let's say you wan…”
Swaminathan: Malta is a direct replacement for coal and gas plants
“Malta's plant integrates really well into the existing legacy grid system because our system is, is comprised of parts and pieces, systems and subsystems that are used in power plants all over the world, including the United States. So for grid operators and u…”
Swaminathan: Displaced coal workers can easily transition to Malta plants
“And because Malta's plant looks, feels, acts, and is operated and maintained just like a traditional thermal asset, you can actually incorporate all those incumbent workers into the plant.”
Swaminathan: Dubai's DEWA Solar Plant Provides 700MW With 12-Hour Storage
“The largest such plant actually is, I think, still under construction or recently commissioned. It's in Dubai. It's called the Dewa plant, and it 700 megawatts with 12 hours of storage.”
Swaminathan: Daytime Solar Curtailment in Spain Enables Zero-Cost Storage Charging
“And actually in, in places like Spain, for example, there is so much solar being produced that they are curtailing solar production during the day. So actually it is possible to charge for some hours of the day at zero cost, or perhaps in some places, even at …”
Swaminathan: Molten Salt Storage Will Never Scale Down to Homes or Vehicles
“I don't see it ever really at the scale of a single home, but I do see it at the scale of, you could have, for example, a large town or a small city being able to essentially have a microgrid that is disconnectable from the overall electricity grid and support…”