Recovering the World's Largest Untapped Energy Source

Roughly 72% of global primary energy input is lost as heat (Forman et al., Renewable and Sustainable Energy Reviews, 2016). The industrial share alone represents tens of billions of dollars in recoverable value annually.

The Industrial Energy Paradox

Energy waste at industrial scale

Industrial waste heat in manufacturing

Energy In, Heat Out

Industrial processes–steel mills, cement plants, glass furnaces, refineries, power stations–operate with fundamental thermodynamic inefficiency. For every joule of input energy:

  • 30-50%: Useful work
  • 50-70%: Waste heat in exhaust streams

The Scale Problem

Industrial processes operate continuously at massive scale. A single steel mill wastes more thermal energy than thousands of homes consume. Multiply across an industry sector, and the aggregate waste is staggering:

  • Global primary energy lost as heat: ~72% (Forman et al. 2016)
  • Indicative annual value, industrial share: $100B+ order of magnitude
  • Historical recovery rate: <5%

Why So Much Goes Unused

Traditional heat recovery – boilers and Organic Rankine Cycle (ORC) turbines – requires:

  • High capital investment ($millions)
  • Complex integration with production
  • High maintenance overhead

For lower-temperature or distributed heat sources, economics don't pencil. MicroPower changes that equation.

Solid-State Recovery, On the Pipe

Modular TEG rings clamp directly onto an exhaust line. No turbine, no working fluid, no rotating machinery – just heat in, electricity out, with retrofit timeframes measured in months rather than years.

Steel mill waste heat recovery system

Steel & Metals: Multi-GigaWatt Opportunity

Field-pilot performance in one of the most demanding industrial thermal environments

Gerdau Pilot Program

Gerdau, one of the world's largest steelmakers, operated a MicroPower TEG pilot on steel mill exhaust:

  • Duration: 2,500+ operating hours
  • Temperature: 420-460°C continuous
  • Performance: System still functional at pilot conclusion
  • Implication: Reliable performance in industrial-grade thermal stress

CMC Steel Texas – First Live-Module Field Pilot

MicroPower's first sustained live-module field pilot, run with Commercial Metals Company (CMC) at their electric arc furnace (EAF) mini-mill in Seguin, TX:

  • Duration: 2015–2022 engagement, multiple in-plant test builds
  • Site opportunity: 16.7 MW average thermal waste; 112.5 GWh/yr recoverable heat identified
  • Performance: Live-module Hatch TEG test (Nov 2021) and copper-clad plate test (Jan 2022) both produced expected-vs-actual voltage data
  • Implication: Live-module operation validated; deposit chemistry on heat-exchange surfaces characterised for the next iteration

ArcelorMittal Dofasco – EAF-Duct Pilot & Commercial Plan

Multi-stage engagement with ArcelorMittal Dofasco (Hamilton, Ontario) on electric-arc-furnace waste-heat recovery:

  • Site: Dofasco integrated steel works, Hamilton ON
  • 2021 pilot design: Water-cooled 50 W PowerBlock on EAF maintenance hatch, 550°C hot-side target
  • 2022 test unit: Initial test unit and supporting infrastructure installed on site; initial data confirmed expected function and was reviewed with Dofasco R&D as a successful initial phase
  • 2023 commercial plan: Staged rollout to ~100 kW from 20 × 1 m² panels
  • Implication: Customer-validated path from pilot to multi-panel deployment

Industry Economics

Steel industry waste-heat recovery scale:

  • Global steel production: 1.9 billion tonnes/year
  • Waste heat per tonne: 5–8 GJ
  • Aggregate thermal waste: 10–15 exajoules (EJ) annually
  • Addressable at system-level TEG recovery: Multiple EJ of incremental electrical output, complementary to ORC where installed

Hydrogen Direct Reduction Steel: Complementary to ORC

The global steel transition opens new thermal streams – honest framing of where TEG fits

HYBRIT, Stegra, Thyssenkrupp Duisburg, ArcelorMittal Hamburg, SALCOS and Voestalpine are bringing H₂-DRI + EAF capacity online through 2030. Compared with a blast-furnace route, these mills produce less very-high-temperature gas but a larger, steadier mid-temperature flow from the shaft reformer and top-gas streams.

Organic Rankine Cycle is the right primary answer on the utility-scale DRI top gas. Modern 1–5 MWe ORC packages from Turboden, Exergy, Ormat and ENOGIA are mature and bankable. MicroPower does not attempt to displace that duty. Our role is in the five specific heat pockets where ORC either cannot reach economically or leaves a residual tail.

Where TEG Is Complementary

  • ORC exhaust tail (250 → 120°C): Incremental kWe with no rotating machinery, no water
  • EAF off-gas intermediate band (350 → 250°C): Cyclic duty where TEGs ramp instantly with ΔT
  • Decentralised sub-1 MW streams: Ladle heaters, tundish dryers, intercoolers – below ORC viability
  • Water-constrained sites: Spain, Morocco, Mexico, Western Australia – TEG needs no condenser water
  • Early-deployment pilot streams: 0.2–0.5 Mt/yr pilots below full-ORC capex threshold

Indicative Mill Economics

On a representative 2 Mt/yr green-steel mill (3–4 TWh/yr electricity demand):

  • Primary ORC on DRI top gas: 8–12% heat-to-power, covers 5–8% of mill demand
  • TEG polishing + decentralised + cyclic pockets: Adds another 1.5–3%
  • Incremental output: 45–120 GWh/yr per mill
  • At €80/MWh: €3.6–9.6 M/yr incremental revenue

At €80–120/t green-steel premium pricing, every tonne of CO₂ displaced by recovered electricity flows to the bottom line beyond the MWh itself.

WP-H cover

WP-H · H₂-DRI Steel Complementary Recovery

Full paper: H₂-DRI capacity buildout, the seven thermal streams on a typical mill, where ORC wins on primary duty, the five pockets where TEG is complementary, and the OEM / EPC / owner-operator channels for 2026–2028 design-in.

Download WP-H (PDF, 6 pages)

BF-BOF Retrofit – The Installed-Base Case

The global blast-furnace / basic-oxygen-furnace fleet is the much larger brownfield opportunity

The global blast-furnace / basic-oxygen-furnace fleet remains the dominant steel-production architecture by tonnage and will be a brownfield retrofit case for the next two decades. MPG's chip envelope (300–1000°C design, 440–550°C lab- and field-proven) matches several BF-BOF heat streams:

  • Hot stove flue gas (200–350°C): Continuous stream, ducted, low particulate burden – direct PowerRing or PowerBlock retrofit candidate.
  • Slag granulation cooling (~150–500°C surface): Tail-end heat below ORC viability; ideal TEG polishing duty.
  • BOF off-gas cooler exhaust (~300–600°C after primary cooling): Cyclic but inside thermal envelope and steady on time-averaged basis.
  • Coke-oven flue gas / waste-heat boilers (~200–300°C tail): Below ORC threshold, suitable for incremental TEG recovery.

Engagement model: same as H₂-DRI – OEM (Primetals, SMS, Danieli), EPC (Tenova, Outotec), owner-operator (ArcelorMittal Dofasco BF cases referenced in our pilot record).

Cement plant ultra-high temperature waste heat

Cement & Glass: Ultra-High Temperature Recovery

Massive thermal resource – anchored by a multi-year pilot record in cement

CEMEX Balcones – Flagship Pilot Programme

CEMEX (Commercial Agreement signed May 2013) ran three successive TEG test units on live equipment at the Balcones cement plant in New Braunfels, Texas:

  • Duration: Three test units installed 2015–2016 across Kiln 2 hood and Kiln 1 exhaust flu
  • Temperature: ΔT 150–440°C across the three configurations
  • Performance: 3.8 V sustained over 146 hrs on K2 hood; 11-week run through Jan 2016 on the K1 flu
  • Implication: May 2016 Phase 1 Final Report proposed staged commercial scale-up to 2.8 MW

Cement Kilns – Sector Conditions

Operating Conditions

  • Kiln temperature: 1000°C+
  • Flue gas exit: 300-400°C
  • Duration: Continuous operation

Recovery Opportunity

  • Flue stack tail-end heat capture below ORC economic threshold
  • 200-300°C range optimal for MicroPower arrays
  • Multi-megawatt facilities → significant incremental electricity recovery
  • Decentralised retrofit pattern already demonstrated at Balcones

Glass Furnaces

Operating Conditions

  • Furnace temperature: 1600°C+ (molten glass)
  • Waste heat stream: 400-600°C
  • Waste heat volume: Massive (melting/forming energy loss)

Recovery Advantage

  • Glass manufacturing is thermally intensive
  • Waste heat exhaust ideally suited for TEG recovery
  • Retrofit feasible without production disruption

NSG (Nippon Sheet Glass) – Laurinburg Pollution Control Plant

October 2021 Conceptual Design with NSG (Nippon Sheet Glass) for the Pollution Control Plant (PCP) at their Laurinburg, North Carolina facility – a multi-megawatt retrofit on the combined flue gas stream:

  • Site: NSG Laurinburg NC Pollution Control Plant
  • Flow envelope: 90" Ø pipe carrying 151,000 Nm³/h combined gas, 640°C in / 300–400°C out
  • Capacity range: 1.5 – 2.5 MW recoverable
  • Architecture: Dual-sided 12 ft × 8 ft MPG Power Panels at 60 kW each, 550°C hot-side design point
  • Design options: Single-path and multi-path configurations modelled, with CFD evaluation of thermal gradient along the pipe length

Oil & Gas: Continuous Thermal Asset

Reliable, steady-state heat sources in energy infrastructure

Refineries

Distillation towers, desulfurization units, and thermal crackers operate continuously at 300-500°C, generating enormous waste heat. TEG recovery offers low-risk revenue generation.

Flare Gas Systems

Flaring waste gases generates intense heat at 600-900°C. TEG arrays capture a portion of flare stack thermal energy, converting a waste stream into electricity.

Compressor Stations

Natural gas compression generates 200-300°C waste heat. Pipeline compressor stations, often remote, are ideal for TEG-based power generation with minimal maintenance.

Specialty Industrial Off-Gas

Calciner and specialty process-heat streams outside cement and steel

Heraeus – Calciner Off-Gas Conceptual

July 2023 Conceptual Design with Heraeus on a calciner off-gas tube – waste-heat recovery on a dense, geometrically constrained exhaust path from a specialty materials process:

  • Site & equipment: 14" diameter calciner off-gas tube; 3 ft replacement section specified for the TEG integration
  • Module population: 18,480 modules total across the replacement section
  • Power at given operating temperatures: 25.6 kW (~1.3 W/module average)
  • Power at desired operating temperatures: 66.5 kW (~3.6 W/module at 950°F hot-side)
  • Relevance: Demonstrates that the MPG architecture adapts to much smaller-diameter geometries than cement-kiln or EAF-duct retrofits – relevant to glass, ceramics, and specialty metallurgy off-gas streams

Power Generation: Turbine, Engine & Fuel Cell Exhaust

Named OEM and operator engagements, plus the last mile of thermal efficiency

Elliott Group – PowerRing Live-Module Pilot

Live-module pilot with Elliott Group (Ebara-owned turbomachinery OEM) at their Jeannette, Pennsylvania test facility – a PowerRing architecture on a pressurised steam supply line, progressing from April 2021 design into a November 2021 populated pipe shipment:

  • Counterparty: Elliott Group – turbine, compressor and cryogenic-pump OEM (Jeannette, PA test facility)
  • Application: Pressurised steam supply line, ~300°C continuous
  • Architecture (April 2021): PowerRing on 6" pipe with 8 PowerBlock modules inline, 5–8 W each. Flange connections; cooling <5 GPM at 60 psi; HOBO thermal loggers with an optional LED load for demonstration
  • September 2021: A section of pipe was shipped to MPG for instrumentation and live-module population
  • November 2021: The populated pipe was returned to the Jeannette test facility for the live-module run

Bloom Energy – SOFC Co-Generation Pilot

Multi-year engineering engagement with Bloom Energy on solid-oxide fuel cell (SOFC) cathode-exhaust co-generation, progressing from concept through a physical TEG-plate installation:

  • 2019 Power Tower concept: Integration study for Bloom's Bundang (Seoul) 8.35 MW SOFC installation and the Moffett Field test site. Moffett Phase 1 at 6–9 W per test unit / 2–2.5 V at ΔT ~300°C (A8-200:2018-009A); Phase 2 targeted 25–30 W per unit. Full-scale Power Tower sized at 14.2 m² total panel area, ~35–40 kW per hot duct, 7 hot ducts = 245–280 kW per installation requiring 2.5–3.0 MW thermal input
  • 2020 YUMA CHP – physical TEG plate installation: 176 MPG A8 modules per unit installed on the SOFC cathode-exhaust duct. Observed averages: 275°C hot-side, 38°C cold-side, ΔT 237°C. Initial output 850 W per unit, with 1.5 kW per unit observed at peak

Gas Turbine & Engine Applications

Gas turbines and large engines exhaust at 400–600°C – in MicroPower's optimal operating range. Named feasibility and pilot engagements:

GTW Brasil Generator Exhaust Pilot

Operating pilot of MicroPower PowerRing systems on a 200 kW natural-gas generator in Brazil (October–November 2020). Three thermal zones profiled (1–2 kW, 12–18 kW, 2–5 kW recoverable bands). Validated equipment durability and the collaborative fabrication model.

GE LM2500+

Feasibility study for the 26.6 MW marine gas turbine – exhaust 142 lbs/sec at 578°C, with ~30.8 MW of available exhaust energy. Modular PowerRing/PowerBlock co-generation concept developed with the turbine as reference case.

Allison 501-KB7

Feasibility study for the 5.5 MW industrial gas turbine (32.7% thermal efficiency, exhaust 45.7 lbs/sec at 513°C, ~8.6 MW of available exhaust energy). Same PowerRing/PowerBlock architecture as LM2500+.

Vericor ASE50B

Feasibility study for the 3.7 MW gas turbine used in oil & gas, industrial and commercial power generation. Multiple exhaust-stream zones suitable for staged TEG insertion.

Volvo Penta D13

Feasibility study for the 12.8 L marine diesel engine (inline six with twin-entry turbo). Multiple installation targets identified across the exhaust train – pre-catalytic >800°C down to post-muffler ~300°C.

Efficiency Multiplication

An additional ~5% system-level recovery on a 25 MW gas turbine corresponds to a modelled ~1.25 MW of incremental electrical output, subject to site-specific thermal design, cold-side integration, parasitic load and OEM constraints. The thermal stream is exhaust heat that would otherwise be vented; no incremental fuel is consumed.

The Investment Case

Why industrial waste heat recovery is economically compelling

ORC and MicroPower TEG are complementary on most industrial duties, not substitutes. The table below compares them where the use case forces a choice – typically at smaller scale, or where water, permitting, or cyclic duty rule ORC out.

Factor ORC (incumbent) MicroPower TEG
Temperature sweet spot 300–450°C, continuous 300–1,000°C (PbTe/TAGS); steady or cyclic
System electrical efficiency 8–15% (well-tuned, primary duty) 5–8% (peer-reviewed, system-level)
Minimum viable scale ~500 kWe–1 MWe, project-specific No minimum – modular from single kWe up
Working fluid / water Organic fluid + condenser cooling No working fluid; cold-side heat rejection via forced air or circulating water (unforced ambient is feasible at lower output)
Moving parts Turbine, pumps, condenser fans None
Installation time 12–24 months 2–6 months retrofit (PowerRing)
Cyclic duty tolerance Poor – turbine must ramp Instant ΔT response
Best role Primary recovery on large continuous streams Tail recovery, sub-MW streams, cyclic pockets, water-constrained sites

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