Heat-to-power innovation could transform industrial decarbonisation prospects

For decades heavy industry has been surrendering vast quantities of thermal energy to the atmosphere, forcing plants to buy fuel for processes that discard a large share of the heat they generate. That persistent inefficiency leaves manufacturers exposed to volatile grid prices and constrains efforts to decarbonise sectors that require extremely high temperatures.

Traditional approaches to making industrial power cleaner , greater deployment of wind and solar plus batteries or pumped hydro to firm supply , have limits when applied to high‑temperature processes. Lithium‑ion storage brings cost, lifecycle and raw‑material challenges; pumped hydro depends on favourable geography; and many industrial furnaces operate at temperatures and duty cycles that are poorly matched to grid‑based renewables. Industry therefore needs solutions that treat waste heat as an asset rather than a nuisance.

One answer being pursued by a University of Michigan spin‑out is thermophotovoltaic (TPV) conversion: devices that turn intense infrared radiation from hot sources directly into electricity without moving parts. According to Heat2Power’s website, the startup co‑founded by professors Stephen Forrest and Andrej Lenert has developed an “air‑bridge” TPV cell architecture that the company says has demonstrated heat‑to‑power conversion above 44% and could exceed 50% as the technology matures. Heat2Power positions its modular panels as scalable from roughly 10 kilowatts to 10 megawatts and compatible with a wide variety of heat inputs , from industrial flue gases and concentrated solar to nuclear and electrically heated stores , across a reported operating window of about 900–2,000°C.

The air‑bridge design places a microscopic layer of air between the semiconductor cell and a reflective surface, Heat2Power explains, allowing high‑energy photons to reach the cell while reflecting lower‑energy photons back to the source. That approach aims to protect the cell from excessive thermal loading, improve spectral control and recycle unusable radiation, boosting net electrical yield. High power density and compatibility with standard semiconductor manufacturing are cited by the company as advantages that could reduce capital and balance‑of‑plant costs compared with alternative heat‑to‑power systems.

Independent research groups have recently reported similar milestone efficiencies for TPV devices, lending broader credibility to the approach. Engineers at MIT and the US National Renewable Energy Laboratory have described TPV cells achieving conversion efficiencies in excess of 40%, and specialised coverage from IEEE and technology outlets has noted the potential of solid‑state TPV converters to rival conventional turbines while offering low maintenance and rapid ramping characteristics. Those studies frame TPV not only as a route to recover waste heat on‑site but also as an enabling technology for grid‑scale thermal batteries that store renewable electricity as heat and release it as power on demand.

For industrial decarbonisation professionals, the appeal of TPV lies in several practical features. First, on‑site heat recovery reduces reliance on the transmission grid and the need for long‑duration electrical storage. Second, because TPV systems are solid‑state, they promise simpler operation and lower downtime than mechanical engines or conventional turbines. Third, modularity could allow staged deployment and retrofits across furnaces, kilns and other high‑temperature equipment without wholesale process redesign.

There are, however, hurdles before the technology can be widely adopted. Real‑world installations must validate lab efficiencies under industrial conditions, demonstrate long‑term reliability at scale, and show acceptable levelised cost of electricity compared with incumbent options. Integration with existing process controls, refractory systems and emissions management will be a practical challenge for plant engineers. Heat2Power’s claims reflect promising prototypes and university‑based research, but commercial vendors and plant operators will require independent field data and vendor warranties to commit capital at the megawatt scale.

Environmental and economic context strengthens the case for on‑site heat conversion. Industry analysts note that reducing fuel consumption and peak grid demand can lower both greenhouse gas emissions and exposure to fuel and electricity price swings. Converting “burn and vent” losses into usable power also reduces the need for additional battery capacity , and the upstream impacts associated with mining critical minerals such as lithium.

If TPV panels deliver the efficiencies and durability indicated by recent studies and Heat2Power’s demonstrations, they could reshape the energy balance of high‑temperature industries by turning furnaces and process streams into distributed power plants. For plant managers and decarbonisation strategists, the technology warrants close attention as a potential component of integrated heat‑management strategies that combine thermal storage, process electrification and targeted renewable supply to cut emissions and improve resilience.

Industry observers caution that the next 18–36 months will be telling: pilot deployments, independent third‑party performance verification and transparent costing will determine whether TPV moves from laboratory promise to an economically viable tool for the industrial decarbonisation toolbox. In the meantime, recent advances make clear that what was once discarded as waste heat may become a scalable resource for cleaner, more self‑reliant industrial operations.