Reducing fossil dependence of high-temperature processes for decarbonizing India’s cement industry

Problem Overview: High emissions and fossil dependence for heating in rotary kiln

Pyroprocessing in cement manufacturing requires varying temperature profiles across stages. While most low temperature processes (below 600°C) have proven electrification technologies, the sintering phase within the rotary kiln requires sustained temperatures between 1350–1450°C. Generating this extreme process heat accounts for ~35% of the cement sector's total CO₂ emissions, making kiln electrification an immense engineering challenge with high abatement potentials ^{[1, 2]}.

Currently, coal and petcoke deliver this thermal intensity continuously, reliably, and at a low price point. Any viable alternative must match all three simultaneously. Developing electrified kiln technology remains highly capital-intensive. Indian cement sector is highly consolidated with the top five entities controlling ~50% of total capacity, any new electrification technology must be engineered for massive, commercial scale deployment to achieve meaningful adoption.

Core Bottlenecks: Transforming core operations in a capex heavy process

India is rapidly expanding its cement manufacturing capacity to satisfy the growing demand. Billions in capital are flowing each year to set up new factories and cement manufacturing processes. However, given the large capex projects, the risk appetite is low, and adoption of new solutions faces three barriers:

Existing Approaches and Technology Readiness

Where is the white-space for innovation?

The demand for low-carbon cement is accelerating, driven by export requirements for decarbonization (e.g CBAM compliance), and the need to hedge against the volatile supply chains of imported coal and petcoke. Major breakthroughs in process engineering, thermal systems integration, alternate production pathways are needed.