UK looks to turn industrial waste heat into a key decarbonisation tool

Capturing, storing and re-using the substantial volumes of heat discarded by heavy industry could become a cornerstone of the UK’s industrial decarbonisation and competitiveness strategy, according to a new analysis by the Royal Society. The study argues that reframing thermal losses as a recoverable resource would lower operational costs for manufacturers, reduce system-wide energy demand and create locally sourced heat for communities.

Industry process heating is a significant source of emissions, accounting for roughly 14% of the UK’s total. The Royal Society’s report finds that about half of the energy consumed in UK industry is lost as waste heat, largely from processes that operate at very high temperatures in sectors such as steel, cement, glass and chemicals. Even as plants shift from fossil fuels to low‑carbon fuels like hydrogen or electrification, the report warns that large quantities of thermal energy will continue to be expelled unless infrastructure is put in place to retain and repurpose it.

The authors set out a staged pathway for maximising the value of residual heat through “heat cascades”, beginning with on‑site reuse and progressing to sharing within industrial clusters before exporting lower‑temperature heat into local heat networks for buildings. By matching successive uses to descending temperature requirements, the cascade model aims to squeeze more utility from the same input energy and to relieve pressure on electricity and renewables as heat demand is electrified.

Professor Andy Woods FRS, Head of Institute for Energy and Environmental Flows at the University of Cambridge and lead author of the report, said: “If the UK is serious about reaching net zero, dealing with the vast amounts of industrial waste heat needs to be integrated into decarbonisation strategies now, and not as an afterthought. As industry makes the switch from fossil fuels to cleaner alternatives, we have a huge window of opportunity to integrate systems to capture and reuse industrial waste heat into future infrastructure. This would strengthen long-term industrial competitiveness and provide a cost-effective way of decarbonising industry.”

The Royal Society recommends that government rapidly map the geography of waste heat supply and heat demand across industry to guide investment in capture, transport and storage technologies and to shape supportive regulatory and financial frameworks. The report cautions that delaying action risks embedding new plant and distribution architectures that are incompatible with later heat‑recovery retrofits, exposing UK firms to higher long‑term costs and reduced competitiveness.

International industry analyses reinforce the scale of the opportunity. McKinsey’s assessment finds at least 3,100 thermal terawatt‑hours of technically feasible waste heat remain untapped globally, suggesting substantial scope for companies to convert discarded heat streams into cost savings and emissions reductions. The Renewable Thermal Collaborative’s Vision Report, focused on the United States but relevant to the UK policy debate, outlines practical pathways and policy levers to decarbonise process heat across priority sectors by 2050, underscoring the role of parallel interventions , technology deployment, corporate purchasing, and regulatory reform , to accelerate uptake.

Translating technical potential into deployed systems will require resolving multiple commercial and engineering barriers. Heat capture at high temperatures demands robust materials and integration with existing furnaces and kilns; economic returns hinge on proximate heat demand or affordable storage and transport; and regulatory signals are needed to de‑risk long‑term infrastructure projects. The Royal Society points to the need for coordinated public support to catalyse first‑of‑a‑kind projects, standardise measurement of heat flows and create markets for recovered heat.

For industrial decarbonisation strategists and buyers of corporate thermal services, the case for early engagement is clear. Captured heat can reduce fuel bills, lower exposure to volatile energy markets and, when shared across clusters or fed into heat networks, create additional revenue streams or lower community energy costs. From a system perspective, heat cascades can reduce peak electrical loads associated with widespread electrification of heating, easing the burden on renewable generation and grid capacity.

If implemented at scale, the Royal Society concludes that a systematic shift to capture and reuse industrial heat could materially strengthen the UK’s manufacturing base while helping meet net‑zero commitments. The report frames this not as a peripheral add‑on but as an integral element of future industrial infrastructure planning, requiring governments, industry and investors to align technical standards, financing models and planning regimes now so that the next generation of plant is designed to retain value rather than discard it.