Episode Summary
Executive Summary: The episode examines industrial steam, which accounts for roughly half of global industrial energy use, and the challenge of decarbonizing it. Addison Stark of Atmozero argues that conventional waste-heat-based heat pumps are bespoke, hard to scale, and expensive. He advocates standardized, air-source, multi-stage heat pumps as a repeatable path to lower-carbon steam, while noting that economics differ sharply between cheap-gas U.S. markets and higher-cost Europe.
Main Topics: Industrial steam as a major emissions source (Priority: 5/5): The hosts frame steam as the hidden backbone of industry—used in food, chemicals, pulp and paper, pharma, cosmetics, and more—and emphasize that decarbonizing steam is a large climate opportunity because it is tied to a huge share of industrial energy demand. How steam is made and categorized (Priority: 4/5): Stark explains steam as gaseous water and distinguishes saturated steam, which delivers most industrial heat, from superheated steam, which is more often used as a reactant in chemical processes. Why conventional boilers persist (Priority: 4/5): The discussion covers the long history of boiler technology, noting that modern industrial boilers still largely resemble the 1867 Babcock & Wilcox design—burning fuel to boil water—though efficiency and pollutant controls have improved. Current decarbonization pathways for steam (Priority: 5/5): The episode compares resistive/electrode boilers, biomass/RNG, and heat pumps as steam decarbonization options. Resistive boilers are commercially available but materially increase operating costs; heat pumps offer better efficiency but face technical and economic barriers. Critique of waste heat as a scaling strategy (Priority: 5/5): Stark argues that waste heat projects are often bespoke, expensive, and limited by mismatches in time, temperature, and location. He says chasing waste heat often increases capex and undermines repeatability, making it a poor basis for scalable productization. Air-source, standardized industrial heat pumps (Priority: 5/5): Atmozero’s approach is to avoid dependence on waste heat and instead use standardized, multi-stage, air-source heat pumps to deliver steam. The goal is to build something modular and mass-manufacturable, like a boiler, rather than custom one-off systems. Regional economics: U.S. vs Europe (Priority: 4/5): The conversation highlights that cheap, abundant U.S. natural gas makes electrified steam hard to justify economically, whereas Europe’s post-Ukraine energy context and LNG dependence have improved the case for electrification and energy security.
Key Arguments: Steam is a massive industrial energy use case, so decarbonizing it offers outsized emissions impact. Most industrial steam is saturated steam delivered at about 225 C or below, which is a practical target for electrification. Modern boilers are still fundamentally the same fossil-fuel combustion devices first standardized in the 19th century. Resistive and electrode boilers are the most mature electrification option, but they typically raise costs 2-3x relative to natural gas steam in North America. Waste heat is often not scalable because it is location-specific, low-temperature, and expensive to capture with custom heat exchangers. Attempting to use waste heat can increase capex more than it reduces opex, especially when projects must be bespoke for each facility. Heat pumps can bridge the electric-versus-gas cost gap if they achieve sufficiently high COP and are deployed in repeatable, multi-stage architectures. Atmozero’s air-source approach sacrifices some efficiency versus waste-heat-based systems but gains scalability and manufacturability. Thermal storage is a complementary solution, especially for large sites with time-of-day pricing or behind-the-meter renewables. Europe’s higher gas prices and energy-security concerns improve the economics and strategic value of electrified steam compared with the U.S.
Data Points: Share of industrial energy used for steam: ~50% - Shail frames steam as accounting for about half of all industrial energy use globally. Industrial boiler market size: $17 billion/year - Stark estimates the global boiler market at about this size. Boiler market growth: 6% per year - Growth rate cited for the broader boiler market. Electric-resistive boiler growth: 26% per year - Growth rate for electric-resistive boilers, making them the fastest-growing boiler sub-sector. Current penetration of electric-resistive boilers: ~1% to 2% - Share of the boiler market currently served by resistive/electrode electric boilers. Cost premium for switching from gas steam to electric steam: 2x to 3x - Typical operating cost increase when replacing natural-gas steam with electric steam in North America. Fuel share of OPEX: 70% to 90% - Fuel cost dominates the operating cost of steam generation over a boiler’s life cycle. Typical temperature range for most steam heat delivery: 225 C and below - Most industrial steam heat delivery occurs in this range. Threshold for manufacturing facilities' thermal load: 65% below 10 MW - Used to argue for small, scalable boiler-like solutions for light-duty manufacturers. Atmozero-defined COP concept: 2x to 3x usable heat per unit electricity - Stark describes the effective performance of heat pumps in the conversation about efficiency. Audience/podcast context: May and June peak-period device shifts - This belongs to sponsor copy rather than the main interview, describing VPP activity at scale.
Pivotal Quotes: "Waste heat is a waste of time" — Addison Stark: Stark summarizes his view that waste-heat-centric industrial heat pump projects are difficult to scale and often become bespoke capex-heavy efforts. "We're essentially burning fossil fuels to boil water" — Addison Stark: He describes the basic operating model of today’s industrial boilers and why they remain central to industrial heat emissions. "We shouldn't assume that we can continue to do bespoke approaches" — Addison Stark: He argues that scalable climate solutions must be manufacturable, modular, and repeatable rather than custom-designed for each facility.
Implications: Industrial steam decarbonization will likely favor standardized, repeatable electrification technologies over bespoke waste-heat projects. Economic viability will depend heavily on regional energy prices, policy, and access to flexible power or thermal storage.