Reclimatize.in  ·  8 July 2026  ·  Cement  ·  Net Zero  ·  Process Emissions

The Baseline Advantage: Why Indian Cement is Already World-Class and the Hard Path to 2070 Net Zero

India's cement sector operates at a highly efficient baseline, boasting an average emission intensity of 0.63 tCO₂/t and a world-leading clinker factor of 67.5%. With 99% of capacity relying on modern dry-process kilns, the "easy" decarbonisation is complete. Reaching the 2070 Net Zero target requires scaling Refuse Derived Fuel (RDF), shifting to performance-based standards, indigenising new technologies, and ultimately deploying CCUS.

When global policymakers discuss industrial decarbonisation, the cement sector is often painted as a primary culprit, responsible for a massive share of anthropogenic carbon emissions worldwide. However, the narrative surrounding the Indian cement sector requires a critical asterisk: Indian cement is already among the cleanest and most energy-efficient globally.

This "Baseline Advantage" stems from structural timing. Because the vast majority of India's cement capacity was constructed rapidly over the last two decades, producers were able to leapfrog older, energy-intensive technology. Today, nearly 99% of India’s operational capacity uses modern dry-process kilns with advanced pre-heaters and pre-calciners. As a result, Indian plants achieve a specific thermal energy consumption of 731 kcal/kg clinker and specific electricity consumption of 73 kWh/tonne cement, substantially lower than the global averages of 827 kcal/kg clinker and 102 kWh/tonne cement. Furthermore, the industry embraced a circular economy logic decades ago, systematically utilizing millions of tonnes of waste fly ash and steel slag to dilute carbon-heavy clinker. Because of these dynamics, India's average clinker-to-cement ratio currently sits at an impressively low 67.5%, compared to the global average of 77%.

The "Hard-to-Abate" Reality: It's Chemistry, Not Just Energy

While the Indian cement sector can rightfully boast about its current efficiency, the sector is anticipating monumental growth. India's per capita cement consumption is roughly 260 kg, well below the global average of 540 kg. Driven by infrastructure and housing demands, total production is projected to reach 660 Mt by 2030, double to roughly 1,329 Mt by 2040, and eventually plateau at 2,100 Mt by 2070. In a Business-As-Usual scenario, this growth would push total sectoral emissions from 246 MtCO₂e in 2023 to a staggering 1,323 MtCO₂e by 2070.

The true challenge lies in the core chemistry of the kiln. Even if a plant miraculously achieves optimal thermal efficiency using renewable energy, the chemical breakdown of limestone (calcination) intrinsically releases carbon dioxide. These "process emissions" account for roughly 60% of the total emissions from cement manufacturing. You cannot electrify away a chemical reaction. This reality fundamentally shapes the regulatory and technological roadmap required for the sector.

Maximizing the "Easy" Wins: Efficiency and Indigenisation

Before deploying highly complex capture technologies, the industry must squeeze every remaining efficiency out of the traditional process. While 99% of kilns use dry-process tech, there is still a 5-10% emission reduction potential by 2050 through seven key efficiency interventions. These include improved refractory materials, kiln combustion improvements, efficient clinker coolers, and automation systems. Notably, these efficiency upgrades are economically viable today, offering marginal savings ranging from INR 400 to 4,000 per tonne of CO₂ abated. For example, simply improving refractory materials can yield marginal savings of 2,800 to 3,600 INR/tCO₂.

Furthermore, to successfully deploy advanced levers like CCUS, kiln electrification, and solar fuels, the indigenisation of technologies is critical. Relying strictly on imported intellectual property and capital goods creates massive cost barriers. The NITI Aayog roadmap emphasizes building domestic human resources, expanding local manufacturing capacity for deployment, and advancing these nascent technologies to higher Technology Readiness Levels (TRLs) through domestic R&D clusters.

The RDF Push and the CCUS Imperative

In the short to medium term, scaling the use of Refuse Derived Fuel (RDF) from Municipal Solid Waste (MSW) is a primary thermal lever. While European kilns routinely achieve high alternative fuel substitution rates, India currently operates at a low Thermal Substitution Rate (TSR) of approximately 3-5%. Challenges include the low calorific value of domestic RDF (1500-1600 Kcal/kg), high moisture (35-40%), and contaminants like glass and stones due to poor sorting, which disrupts kiln operations. To combat this, guidelines have been modified to mandate that cement plants within 400 km of solid waste facilities incrementally replace their fuel intake with RDF, targeting a 20% TSR by 2030. Successful implementation models in Indore and Goa have proven that structured source segregation and PPP models can secure high-quality RDF supply.

However, to ultimately align with the 2070 Net Zero mandate, the cement industry will eventually exhaust its mitigation levers across fuels, electricity, and clinker substitution. Therefore, Carbon Capture, Utilisation, and Storage (CCUS) is a mathematical necessity. CCUS is projected to deliver 35-54% of the sector's total carbon abatement.

The Government of India has recognized this imperative. The proposed National Mission on CCUS outlines a pilot target for the cement sector of 2,000 TPD of capture and 2,000 TPD of utilisation, with an estimated initial investment of INR 1,100 crore. By 2070, roughly 95% of the CCUS demand is expected to be met through geological storage (CCS), while 5% will be achieved through utilisation (CCU). The Indian cement sector has already proven its ability to lead the world in energy efficiency; its next era will be defined by how it masters carbon capture.