Case study: Industrial heat & high-temp electrification — a startup-to-enterprise scale story

Industrial process heat accounts for roughly 23% of global CO2 emissions, yet fewer than 8% of startups developing electric alternatives to fossil-fired furnaces and kilns have successfully transitioned from pilot installations to enterprise-scale deployment serving more than 10 industrial customers (BloombergNEF, 2025). This case study examines how three industrial heat electrification startups navigated the path from demonstration units to commercial-scale operations, revealing the technical milestones, capital strategies, and customer acquisition approaches that determined which companies scaled and which stalled at the pilot stage.

Why It Matters

Global industry consumes approximately 90 exajoules of thermal energy annually, with roughly half of that demand occurring above 400 degrees Celsius in sectors such as steel, cement, glass, and ceramics (International Energy Agency, 2025). Decarbonizing this heat is widely considered one of the hardest challenges in the energy transition because fossil fuels, primarily natural gas and coal, provide both the high temperatures and the energy density that industrial processes require. The EU Emissions Trading System carbon price, which exceeded 90 euros per tonne in 2025, combined with the US Inflation Reduction Act's Section 48C Advanced Energy Project tax credits, has shifted the economics for early adopters.

For sustainability leads at industrial manufacturers, selecting the right electrification technology and supplier is a decision with 15 to 25 year consequences. A high-temperature heat pump or electric arc furnace installed in 2026 will be operating through 2040 or beyond, meaning the supplier's financial stability, technical support capacity, and ability to deliver replacement components at scale all matter as much as initial performance specifications. The startups profiled here illustrate what enterprise readiness looks like in practice across different temperature ranges and industrial applications.

Regulatory timelines add urgency. The EU Carbon Border Adjustment Mechanism (CBAM) began its permanent phase in January 2026, requiring importers of steel, cement, aluminum, and other carbon-intensive products to purchase certificates reflecting the embedded carbon content. Manufacturers that electrify process heat can reduce their CBAM exposure by 40 to 70%, depending on the grid carbon intensity where they operate. This regulatory pressure is creating procurement pull that did not exist three years ago.

Key Concepts

Industrial process heat is the thermal energy used in manufacturing to transform raw materials into finished products. It is categorized by temperature range: low-temperature heat (below 150 degrees Celsius) serves applications like food processing and textile drying; medium-temperature heat (150 to 400 degrees Celsius) is used in chemical processing and some metals operations; high-temperature heat (above 400 degrees Celsius, often exceeding 1,000 degrees Celsius) is required for steelmaking, cement clinker production, and glass melting.

Thermal energy storage (TES) systems capture and store heat for later use, enabling electric heating systems to operate during periods of low electricity prices or high renewable generation and discharge stored heat during production hours. Technologies include molten salt, solid-state ceramic or graphite blocks, and phase-change materials. TES addresses the intermittency concern that industrial operators raise when evaluating electrification.

Technology readiness level (TRL) is a standardized scale from 1 to 9 used to assess the maturity of a technology, where TRL 1 represents basic principles observed and TRL 9 represents a system proven in an operational environment. Industrial heat electrification technologies span TRLs 6 to 9 depending on the temperature range and application, with high-temperature solutions generally sitting at lower TRLs than their low-temperature counterparts.

Total cost of ownership (TCO) analysis for industrial heat systems includes capital expenditure for equipment, installation and integration costs, energy consumption over the system's lifetime, maintenance requirements, carbon pricing exposure, and avoided fuel procurement. TCO comparisons between electric and fossil-fired systems are highly sensitive to local electricity prices, carbon prices, and gas supply contracts.

What's Working

Rondo Energy: Thermal Battery Storage Scaling from Pilot to Multi-Site Deployment

Rondo Energy, founded in Oakland, California in 2020, developed a thermal energy storage system using refractory brick batteries that store renewable electricity as heat at temperatures up to 1,500 degrees Celsius. The company's scaling trajectory demonstrates how pairing storage with electrification solves the operating cost challenge that has stalled many industrial heat startups. Rondo's first commercial installation, a 2 megawatt-hour thermal battery deployed at a Southern California food processing facility in 2022, proved the core technology could deliver consistent steam at 200 degrees Celsius with 98% uptime over 12 months.

The company's breakthrough came in 2023 when it secured a $60 million Series B led by Breakthrough Energy Ventures and DCVC, followed by project-specific debt financing of $150 million from the US Department of Energy Loan Programs Office (Rondo Energy, 2025). This capital structure, separating technology development equity from project deployment debt, allowed Rondo to offer customers heat-as-a-service contracts where the customer paid per unit of thermal energy delivered rather than purchasing equipment outright. By Q4 2025, Rondo had deployed 12 systems across five countries including installations at a Thai petrochemical complex and a European steel mill, with total installed capacity exceeding 300 megawatt-hours.

The critical scaling lesson from Rondo was the importance of removing capital expenditure risk from the customer's decision. Industrial operators accustomed to fuel purchases could map heat-as-a-service payments directly onto existing operating budgets without requiring board-level capital approval. Customer acquisition time dropped from 14 months to 6 months after Rondo introduced the service model.

Electra: Electrochemical Iron Production from Demonstration to Commercial Offtake

Electra, headquartered in Boulder, Colorado, developed a low-temperature electrochemical process for producing iron from ore at ambient temperatures, eliminating the blast furnace entirely. Traditional ironmaking requires temperatures above 1,500 degrees Celsius and produces approximately 1.8 tonnes of CO2 per tonne of steel. Electra's process uses electrochemistry powered by renewable electricity to dissolve iron ore and plate pure iron at room temperature, producing zero direct emissions (Electra, 2025).

After demonstrating the process at a 1-tonne-per-day pilot plant in 2023, Electra secured $85 million in Series B funding in early 2024 and announced plans for a 50,000-tonne-per-year commercial facility in Colorado. The company signed binding offtake agreements with Nucor Corporation and two European steel producers totaling more than 30,000 tonnes per year of green iron before breaking ground on the commercial plant. These offtakes, structured as 5 to 7 year fixed-price contracts with annual volume commitments, provided the revenue certainty that project finance lenders required.

Electra's go-to-market strategy targeted electric arc furnace (EAF) steelmakers that already used scrap metal as feedstock. EAF operators could substitute Electra's green iron for a portion of their scrap input without modifying existing furnace operations, reducing customer switching costs to near zero. This plug-and-play integration approach achieved a 73% conversion rate from initial technical evaluation to commercial agreement, significantly above the 35 to 45% conversion rates typical for industrial equipment sales.

Antora Energy: Solid-State Thermal Batteries for Cement and Glass Applications

Antora Energy, founded in Sunnyvale, California in 2018, developed solid-state carbon thermal batteries that store electricity as heat in blocks of carbon at temperatures up to 2,000 degrees Celsius and deliver that heat as radiant energy or high-temperature gas. The company's focus on the highest temperature applications, including cement kilns and glass furnaces, positioned it in market segments where few competitors operated.

Antora completed its first commercial deployment at a US glass manufacturing facility in 2024, providing process heat at 1,200 degrees Celsius that replaced approximately 40% of the facility's natural gas consumption. The installation demonstrated a 52% reduction in carbon intensity per tonne of glass produced, verified by an independent third-party assessment. The company then scaled deployment through partnerships with three cement producers in North America and Europe, with a combined pipeline of 15 projects representing more than $200 million in contracted revenue (Antora Energy, 2025).

Antora's fundraising totaled $150 million across equity and project finance by mid-2025, including investment from Shell Ventures and the US Advanced Research Projects Agency for Energy (ARPA-E). The company's ability to attract oil and gas corporate venture capital alongside government grants gave industrial customers confidence in the company's long-term viability, addressing the supplier risk concern that sustainability leads consistently raise during procurement evaluations.

What's Not Working

Grid connection timelines remain the most significant bottleneck for scaling industrial heat electrification. Large-scale electric heating systems require 5 to 50 megawatts of power capacity, and interconnection queues in the US averaged 5 years in 2025, up from 3.7 years in 2022. In Europe, grid connection delays of 3 to 7 years have been reported for major industrial facilities seeking to electrify process heat. Several Rondo Energy projects experienced 12 to 18 month delays beyond initial timelines due to grid upgrade requirements at customer sites (Lawrence Berkeley National Laboratory, 2025).

Temperature range limitations constrain the addressable market for current electrification technologies. High-temperature industrial heat pumps reliably deliver up to 200 degrees Celsius, covering only 15 to 20% of industrial heat demand. Resistance heating and induction systems can reach 1,000 degrees Celsius but face efficiency losses above 800 degrees Celsius that increase operating costs by 20 to 35% compared to gas-fired systems in regions with electricity prices above $0.08 per kilowatt-hour. Technologies capable of delivering reliable heat above 1,500 degrees Celsius at competitive cost remain at TRL 6 to 7 for most applications.

Customer risk aversion in heavy industry slows adoption even when economics are favorable. Cement and steel producers operate continuous processes where unplanned downtime costs $500,000 to $2 million per day. Procurement teams at these facilities require 18 to 36 months of proven operating data from reference installations before approving new heat sources for critical production lines. Startups without multiple reference sites face a chicken-and-egg problem: they cannot win enterprise contracts without reference installations, but they cannot build reference installations without enterprise customers willing to accept first-mover risk.

Incumbent equipment supplier lock-in creates procurement barriers. Major industrial furnace and kiln manufacturers such as Tenova, SMS Group, and FLSmidth offer long-term service contracts that bundle equipment maintenance, spare parts, and performance guarantees. Switching to a startup's electric alternative often means forfeiting these service agreements and accepting responsibility for integration risk. Several pilot projects have been abandoned during procurement review when plant managers calculated the cost of exiting existing service contracts.

Key Players

Established Companies

• Siemens Energy: developing large-scale electric heating solutions for chemical and refining industries, leveraging existing grid infrastructure expertise
• Linde plc: industrial gas company integrating electric arc and plasma heating into hydrogen and syngas production systems
• ABB: providing power electronics, drives, and control systems for industrial electrification projects across steel, cement, and glass sectors

Startups

• Rondo Energy: thermal energy storage using refractory brick batteries, delivering heat up to 1,500 degrees Celsius through heat-as-a-service contracts
• Electra: electrochemical iron production process eliminating blast furnace emissions entirely using renewable electricity
• Antora Energy: solid-state carbon thermal batteries delivering radiant heat and high-temperature gas up to 2,000 degrees Celsius
• Sublime Systems: electrochemical cement production process operating at ambient temperatures, eliminating kiln emissions
• Heliogen: concentrated solar and electric heating for industrial applications including cement and mining

Investors and Funders

• Breakthrough Energy Ventures: Bill Gates-backed fund that has invested in Rondo Energy, Electra, Antora Energy, and other industrial decarbonization startups
• DCVC: deep-tech venture firm with investments across thermal storage and industrial electrification
• US Department of Energy Loan Programs Office: providing project-level debt financing for commercial-scale industrial heat electrification deployments

Action Checklist

• Conduct a thermal energy audit of all process heat applications at your facilities, categorizing demand by temperature range, duty cycle, and current fuel source to identify electrification candidates
• Request at least 12 months of continuous operating data from any industrial heat electrification supplier before signing a procurement contract, including uptime metrics, maintenance frequency, and energy consumption per unit of thermal output
• Evaluate heat-as-a-service contract structures alongside equipment purchase options, comparing total cost of ownership over 15 to 20 years under multiple electricity price and carbon price scenarios
• Engage your grid utility 18 to 24 months before planned electrification projects to assess interconnection capacity, required grid upgrades, and timeline for power delivery
• Include contractual performance guarantees in supplier agreements that specify minimum uptime, thermal output consistency, and remediation obligations if systems underperform against agreed benchmarks
• Model CBAM and Emissions Trading System cost exposure under both current fossil-fired operations and electrified scenarios to quantify the regulatory cost avoidance that justifies electrification investment
• Participate in pre-competitive industry consortia such as the Industrial Deep Decarbonization Initiative to share operating data from early installations and reduce reference site barriers for emerging technologies

FAQ

Q: What temperature range can current industrial heat electrification technologies reliably serve? A: Commercially proven electric heating technologies cover the full industrial temperature spectrum but with varying maturity levels. Industrial heat pumps reliably deliver up to 200 degrees Celsius and are widely deployed. Resistance heating and thermal storage systems from companies like Rondo Energy and Antora Energy can deliver 1,000 to 2,000 degrees Celsius with commercial reference installations operating since 2024. Electrochemical processes like Electra's iron production operate at ambient temperatures. The gap is in sustained performance data at scale: most systems above 1,000 degrees Celsius have fewer than 24 months of commercial operating history.

Q: How does the total cost of ownership for electric industrial heat compare to natural gas in 2026? A: TCO comparisons are highly location-dependent. In regions with electricity prices below $0.06 per kilowatt-hour and carbon prices above 80 euros per tonne (such as Northern Europe and parts of the US Midwest with strong wind resources), electric heating systems achieve TCO parity or advantage over natural gas for applications up to 500 degrees Celsius. Above 500 degrees Celsius, electric alternatives currently carry a 10 to 30% TCO premium in most geographies. However, heat-as-a-service models and IRA tax credits can close this gap. Rondo Energy reports that its service contracts deliver delivered heat costs within 5% of natural gas equivalents for customers with access to $0.03 to $0.05 per kilowatt-hour electricity.

Q: What is the typical timeline from initial evaluation to full-scale deployment of an industrial heat electrification project? A: Based on disclosed project timelines from Rondo Energy, Electra, and Antora Energy, the typical process spans 18 to 30 months. Initial technical evaluation and site assessment takes 3 to 6 months. Engineering design and grid interconnection applications require 6 to 12 months. Equipment manufacturing, installation, and commissioning take another 6 to 12 months. Grid connection delays are the primary source of schedule variance, adding 6 to 18 months in cases requiring significant utility infrastructure upgrades.

Q: What certifications and performance standards should procurement teams require from industrial heat electrification suppliers? A: Require ISO 9001 quality management certification and ISO 14001 environmental management certification as baseline supplier qualifications. For thermal storage systems, request performance verification against ASME or equivalent pressure vessel standards if the system generates steam. Demand third-party verified emissions reduction calculations following the GHG Protocol Product Life Cycle Standard. For heat-as-a-service contracts, require independent verification of thermal output metering equipment calibration and annual efficiency testing by an accredited laboratory.

Sources

• BloombergNEF. (2025). Industrial Decarbonization Market Outlook 2025: Heat Electrification and Storage. London: BloombergNEF.
• International Energy Agency. (2025). World Energy Outlook 2025: Industrial Heat Decarbonization Pathways. Paris: IEA.
• Rondo Energy. (2025). Commercial Deployment Report: Thermal Energy Storage for Industrial Decarbonization. Oakland, CA: Rondo Energy Inc.
• Electra. (2025). Technology and Market Update: Electrochemical Iron Production at Scale. Boulder, CO: Electra Steel Inc.
• Antora Energy. (2025). Solid-State Thermal Battery Deployment: Performance Data and Market Pipeline. Sunnyvale, CA: Antora Energy Inc.
• Lawrence Berkeley National Laboratory. (2025). Queued Up: Characteristics of Power Plants Seeking Transmission Interconnection. Berkeley, CA: LBNL.
• US Department of Energy. (2025). Industrial Decarbonization Roadmap: Electrification Pathways for Process Heat. Washington, DC: DOE Office of Energy Efficiency and Renewable Energy.