Economy & Market
Microgrids can transform cement plant energy sourcing
Published
11 months agoon
By
admin
Dr Avijit Mondal, Deputy General Manager (DGM), NTPC Energy Technology Research Alliance (NETRA), NTPC, explains in detail how power sector innovations are opening new frontiers for energy-intensive industries like cement.
As the cement sector seeks pathways to efficiency and decarbonisation, lessons from the power sector—particularly thermal and renewable energy research—are becoming indispensable. Dr Avijit Mondal, Deputy General Manager, NTPC Energy Technology Research Alliance (NETRA), NTPC, shares how innovations ranging from microgrids and biomass co-firing to CO2-to-methanol pilots and CFD modelling are reshaping cement plant energy sourcing. In this conversation, he outlines a roadmap where power plant technologies and cement operations converge to deliver cleaner, more reliable and cost-efficient production.
How does research in thermal power plants drive energy efficiency for heavy industrial loads such as cement?
Cement is India’s second-largest industrial power consumer, and every kilowatt-hour saved or sourced from cleaner energy directly lowers the cost of clinker production. Research and development in thermal power plants (TPPs) plays a critical role in achieving these gains, delivering benefits through high-efficiency generation, flexible operation, improved power quality and integrated carbon management. Most importantly proper combustion in boilers (thermal power plants) creates good quality fly ash (bottom ash), which is an important raw material for the cement industry.
Advancements such as supercritical and ultra-supercritical steam cycles, improved turbine designs and auxiliary systems with variable frequency drives on feedwater, induced-draft, and forced-draft fans lower heat rates by 1.5 per cent to 3 per cent, reducing both grid emission factors and delivered tariffs-especially during off-peak hours. Ultra-low-load stable operation enables cement plants to shift energy-intensive processes such as finish grinding and mine operations to off-peak night hours, reducing power costs. R&D in coal-quality handling-using on-belt analysers and AI-driven blending-enhances steam generator stability, reducing ramp losses and improving heat rates, which in turn minimises power price volatility for industrial users.
Power quality research, including stat-coms, synchronous condensers and harmonic filters, stabilises voltage and frequency for large drives, reducing motor losses, tripping incidents and rework in cement operations. Flexible load management and industrial demand response strategies co-developed with utilities-such as automated compressor/crusher set-backs and ‘grind-at-night, burn-by-day’ schedules-help align cement energy use with renewable-rich periods. On the thermal side, TPP waste-heat recovery concepts, air preheaters and regenerative exchangers have been adapted for cement kilns, enabling exhaust gas recovery for process heat or captive power.
Parallel work in low-NOx combustion, biomass co-firing and fuel preparation optimises kiln firing efficiency, while digitalisation and predictive analytics, pioneered in TPP operations, enhance process control, maintenance scheduling, and energy loss detection in cement plants. Cogeneration models allow direct supply of steam or heat from nearby TPPs, and joint carbon capture and utilisation research offers pathways to mineralise captured CO2 in cement or use it in curing, further reducing emissions.
The combined effect of these interventions is substantial: incremental heat-rate improvements alone can lower grid CO2 intensity by 20-40 g/kWh, while smart time-of-use alignment can cut plant power costs by 2 per cent to 4 per cent. Together, these innovations lower specific energy consumption, improve process stability, and make cement manufacturing more cost-competitive and sustainable.
What innovations in microgrids or Solar/BESS could benefit cement power sourcing microgrid architecture for cement?
Cement manufacturing is among the most energy-intensive industrial processes, with continuous high loads from kilns, grinding mills, crushers and conveyors. Integrating a hybrid behind-the-meter microgrid offers a powerful solution to improve energy efficiency, reduce power costs, and enhance operational resilience. A typical integrated cement plant can deploy a hybrid system comprising 8-15 MWp of rooftop and ground-mounted solar PV, 8-25 MW of waste heat recovery (WHR) capacity, and a Battery Energy Storage System (BESS) sized for 15-30 minutes of peak plant load. In this configuration, solar PV supplies the daytime base load for processes like grinding and material transport, WHR delivers steady baseload power for kiln and cooler exhaust, and BESS handles ramping and flicker control. The BESS also enables peak shaving during kiln starts or crusher surges, provides frequency and VAR support to safeguard large variable frequency drives (VFDs), smooths renewable fluctuations to stabilise kiln induced-draft (ID) control, and offers black-start capability for captive power systems.
The system is coordinated by an advanced Energy Management System (EMS) with process awareness. This EMS forecasts solar generation and plant load, dynamically reschedules non-critical operations such as mills, packing lines and mine conveyors into solar-rich periods, and isolates the kiln and calciner from disturbances. It can also manage load shifting strategies, such as ‘grind at day, burn at night,’ aligning with renewable-rich grid periods.
Recent innovations in industrial-scale BESS include long-duration storage (4-8 hours) to cover full or partial shifts on solar and WHR, and high-C-rate batteries capable of handling sudden restarts or process surges. Some plants also deploy DC-coupled PV + BESS configurations, which reduce inverter losses and improve round-trip efficiency compared to AC-coupled systems. Capturing curtailed renewables by storing excess solar or wind energy in BESS or using it for low priority loads such as precursing further enhances system value.
Supporting infrastructure includes microgrid-ready switchgear and fast-transfer/static breakers to enable seamless islanding from the grid without tripping large motors. The architecture supports multiple operating modes:
- Grid-Connected Optimised Mode: Minimises grid draw during peak tariff hours.
- Island Mode: Operates on WHR + Solar + BESS during grid outages.
- Peak Shaving Mode: Uses BESS to offset short-term spikes, reducing demand charges.
- Load Shifting Mode: Aligns high-energy processes with solar availability.
Impact: Field implementations show 18 per cent to 28 per cent reductions in grid imports, 3 per cent to 6 per cent lower specific power costs, improved power quality (fewer nuisance trips), and measurable gains in kiln uptime. By combining solar, WHR, storage and intelligent control, microgrids can transform cement plant energy sourcing into a cleaner, more reliable and more cost-effective system.
How does a flue-gas CO2-to-methanol pilot translate to process efficiencies?
A flue-gas CO2-to-methanol pilot can translate into process efficiencies for both power plants and the cement industry in ways that go beyond just making methanol-it can also improve energy utilisation, plant integration and operational flexibility.
Here’s the breakdown in context:
A. Productive Use of a Waste Stream
- Traditional: Flue gas CO2 is a liability-needs to be vented or captured and stored, consuming energy without direct revenue.
- With CO2-to-Methanol: CO2 becomes a feedstock for a value-added product (methanol), effectively monetising a waste stream.
- Efficiency Link: This improves the overall resource efficiency of the plant because the carbon in the fuel/raw material is not wasted but transformed into a marketable chemical.
B. Integration with Heat and Power Flows
- The hydrogen for methanol synthesis (via water electrolysis) requires significant electricity, ideally from renewable or low-cost surplus power.
- In power plants: The process can use low-grade waste heat from turbines or economisers to preheat CO2/H2 streams, reducing compression and reaction energy.
- In cement plants: Kiln and clinker cooler waste heat can play the same role, allowing higher overall thermal efficiency without disrupting clinker production.
C. Smoothing Power Plant Load and Improving Capacity Factor
- Electrolysers for H2 production can act as a flexible load:
- Ramp up when grid demand is low or renewable generation is high.
- Ramp down when power demand is high.
- Benefit for TPPs: Reduces the need for inefficient low-load operation and enables steadier turbine efficiency.
Benefit for cement plants: If tied to an on-site WHR + PV/BESS microgrid, it can soak up excess renewable/WHR power during low cement demand periods.
D. Synergy with Flue Gas Conditioning
- The CO2 capture step for methanol production often includes flue gas cleaning (removing SOx, NOx, particulates).
- This upgrades the quality of flue gas, which can reduce corrosion/fouling in downstream WHR boilers, improving plant availability and heat recovery efficiency.
E. Reduction in Carbon Intensity
- Power sector: Each tonne of CO2 converted to methanol lowers net emissions, improving compliance with carbon pricing or emission norms.
- Cement sector: Reduces CO2 intensity per tonne of clinker by diverting a portion of process emissions into methanol synthesis.
F. Methanol as a Circular Energy Carrier
The methanol produced can be:
- Sold as a chemical feedstock or marine fuel.
- Used internally in dual-fuel boilers/turbines for backup power.
This creates an energy loop-CO2 captured from flue gas ? methanol ? reconverted to energy when needed, improving energy storage and fuel flexibility.
Can biomass co-firing methods from power plants be customised for cement kilns?
Yes-adaptation is practical, with kiln-specific care:
Transferable learnings from utility co-firing
- Feedstock prep: Size reduction, torrefaction/pelletising, moisture control ? stable feeding through calciner/kiln burners.
- Metering and pneumatics: Proven dosing/air-assist systems maintain steady thermal input and flame shape.
- Chlorine/alkali management: Power-plant protocols for fuel qualification apply directly; in cement, they also protect clinker quality and rings.
- Cement-specific customisations
- Burner tuning: Biomass raises volatiles and lowers flame temperature; adjust primary/secondary air, swirl, momentum to avoid over-penetration or CO spikes.
- Ash chemistry: Track K2O/Na2O/Cl and P2O5 to manage coating and alite formation; limit certain agri residues unless pre-leached or blended.
- Where to fire: Higher substitution is often easier in the calciner than main burner; start 10 per cent to 20 per cent TSR in calciner, step up with monitoring.
- Outcomes: 15 per cent to 35 per cent thermal substitution is realistic with prepared biomass; 1 per cent to 4 per cent specific heat consumption (SHC) reduction from improved combustion stability and moisture trimming.
How does CFD modelling optimise combustion for lower fuel use and emissions?
Computational Fluid Dynamics (CFD) has emerged as an indispensable tool for optimising energy efficiency, combustion stability, and emissions control in cement manufacturing. By simulating the three-dimensional flow dynamics and combustion chemistry inside the kiln, calciner, tertiary air ducts, and burners, CFD provides a deep, visual understanding of how gases, fuels and solids interact. These insights enable targeted design improvements and operational fine-tuning, ultimately reducing energy consumption and extending equipment life.
Design and operational applications. CFD modelling allows engineers to evaluate and optimise critical parameters including:
- Burner Quarles and Jet Geometry: Adjusting jet angles, swirl intensity, and momentum ratios for ideal flame characteristics.
- Airflow Distribution: Balancing secondary and tertiary air splits to match process demand.
- Calciner Staging: Sequencing combustion zones to maximise calcination efficiency.
- SNCR/AFR Injection Points: Locating selective non-catalytic reduction systems and alternative fuel inlets for optimal mixing and burnout.
Efficiency and performance levers are identified through CFD
- Burner Optimisation: Tailoring swirl and jet momentum to create a narrower, elongated flame enhances heat transfer to the kiln bed, delivering a 0.5 per cent to 2 per cent reduction in specific heat consumption (SHC).
- Optimised Calciner Staging: Achieving complete calcination at reduced excess air levels cuts NO emissions by 15 per cent to 30 per cent while avoiding the energy penalties of over-firing.
- Hot-Spot Mitigation: Detecting and eliminating localised high-temperature zones prevents ring formation and coating build-ups, extending refractory life and improving uptime-a significant indirect energy saving.
Strategic AFR Placement: Injecting late-volatile alternative fuels in zones with the right oxygen and temperature balance avoids CO spikes and unburnt fuel losses.
The power of CFD lies not only in simulation but also in validation and integration. Best practice involves confirming model predictions through on-site measurements, including kiln hood and calciner thermography, CO/NOx traverses, and clinker microscopy. Once validated, these insights can be locked into operations using Advanced Process Control (APC) systems, ensuring consistent, long-term efficiency gains.
What role will hydrogen technologies play in decarbonising heavy industries?
Near-term actions (0-5 Years)
- Hydrogen Enrichment of Burners (5 per cent to 20 per cent): Enhance flame stability and precision, enabling higher biomass and alternative fuel (AFR) substitution without incurring CO emissions penalties.
- Green Oxygen Integration: Use oxygen generated from electrolysers to reduce excess air requirements and achieve better stoichiometric control, lowering NOx formation.
- Power-to-Heat Applications – Deploy electro-boilers and electric dryers for plant auxiliaries in solar-rich regions, freeing up fossil-fuel-derived heat for the kiln.
- Medium-term actions (5-10 Years)
- Hydrogen-Ready Burners: Install kiln and calciner burners designed for high hydrogen blends, with ammonia used as a hydrogen carrier and cracked near the point of use.
- E-Fuels Co-Firing: Incorporate e-methanol or e-syngas to provide dispatchable, low-carbon thermal energy.
How are ash or waste-heat recovery (WHR) technologies from power plants applicable to cement production?
Ash utilisation
- Fly Ash in Blended Cements (PPC/PSC): Substituting 25 per cent to 35 per cent clinker with fly ash significantly reduces thermal load and CO2 intensity. Performance depends on Loss on Ignition (LOI), fineness, and phase composition; selectively harvested dry-silo ash offers the most consistent quality.
- Bottom Ash / Pond Ash: Usable in certain
products after classification and grinding, though attention is needed to control unburnt carbon and contaminants. - FGD Gypsum: Flue Gas Desulphurisation gypsum from power plants provides a dependable alternative to natural gypsum for setting regulation.
Waste heat and power integration
• Cement WHR Systems: Using AQC/SP boilers with steam turbines or Organic Rankine Cycle (ORC) units typically recovers 20-35 kWh/t clinker. Best practice involves applying utility pinch-analysis learnings, controlling fouling,
and optimising condenser pressure for uptime and efficiency.
• Cross-Industry Synergies: Co-location with power plants enables use of their low-grade heat (or CO2 capture waste heat) for pre-drying alternative fuels or raw mix; conversely, WHR output from cement plants can supply auxiliary loads during grid peak demand.
• Circular Economy Benefits: Combining ash and FGD gypsum utilisation closes the mineral loop, while WHR and low-grade heat recovery close the energy loop-together lowering Specific Heat Consumption (SHC) and Scope 1 and 2 emissions.
A practical 6-step roadmap for cement plants
• Step 1: Energy Mapping and Pinch Analysis: Assess kiln, calciner, mills, and auxiliaries to identify 1 per cent to 3 per cent SHC savings.
• Step 2: CFD and Advanced Process
Control: Optimise burner, calciner, and AFR injection points for improved efficiency and emissions control.
• Step 3: Solar-WHR-BESS Microgrid: Implement process-aware Energy Management Systems to achieve 15 per cent to 20 per cent peak-shaving.
• Step 4: Biomass/AFR Scale-Up: Apply fuel-lab testing protocols to safely reach 20 per cent to 30 per cent Thermal Substitution Rate (TSR) in the calciner first.
• Step 5: CO2-to-X Pilots: Integrate heat
cascade systems and O2 reuse where green power is accessible.
• Step 6: Power-Sector Partnerships: Secure agreements for deep-turndown tariffs, power-quality guarantees, and consistent Class-A fly ash and FGD gypsum supply.
With contribution from Dr Gaurav Richhariya,
Executive R&D (Ash Technology), NTPC Energy Technology and Research Alliance (NETRA), NTPC.
Economy & Market
Fornnax Names Lukas Baur as Authorised Service Partner to Bolster EU Operations
Published
7 days agoon
July 23, 2026By
admin
Strapline: Fornnax Technology has appointed NOBA Maschinenservice’s Lukas Baur as its authorised service partner for the European Union, strengthening its commitment to delivering fast, reliable, and localised after-sales support across the region.
Fornnax Technology, a leading manufacturer of industrial shredding solutions, has announced the appointment of Mr. Lukas Baur of NOBA Maschinenservice as its authorised service partner for the European Union. The partnership, formalised under the authorisation of Fornnax CEO Mr. Jignesh Kundaria, reinforces the company’s commitment to providing dependable, localised service support to its expanding customer base across Europe.
Strengthening Service Through Proven Expertise
With over two decades of experience in servicing, maintaining, and overhauling industrial shredders, Mr. Baur brings extensive technical expertise to the partnership. His capabilities span welding, hardfacing, shaft and knife rebuilding, complex assembly, hydraulics, and complete electrical engineering services, delivered in collaboration with a trusted partner company based in Halle/Saale.
Operating from Worbis, Germany, Mr. Baur is strategically positioned to provide emergency support across the European Union within 24 hours, covering an operational radius of approximately 1,000 kilometres.
Supporting this capability is a well-equipped service infrastructure comprising 12 Mercedes Sprinter service vans, a team of 24 skilled technicians, specialised bearing-change tools, a fully equipped hydraulic workshop, and a 1,000-square-metre facility with a five-ton crane track. Together, these resources position his team to manage the complete spectrum of Fornnax’s European service requirements efficiently and reliably.
Partnership Driven by Industry Insight
Having spent years servicing Eldan, Lindner, and Vecoplan shredders across the European recycling industry, Mr. Baur’s decision to collaborate with Fornnax is rooted in his understanding of market needs and customer expectations. His experience has provided valuable insight into what recycling plant operators require—not only from their machinery but also from the service teams supporting them.
According to Mr. Baur, Fornnax’s reputation for robust machine construction, superior wear protection, and maintenance-friendly design made the partnership a natural fit.
The collaboration comes at a time when Europe’s tyre recycling industry is facing mounting challenges, including rising cost pressures, shrinking margins, delayed investments, and a shortage of skilled labour. Mr. Baur believes these conditions reinforce the need for technically strong service partners capable of delivering rapid, dependable support.
Commenting on the partnership, he said, “Fornnax, with its exceptional price-performance ratio and superior quality, has the potential to become a market leader in Europe. We would like to be their service partner in this journey.”
Comprehensive Support Across the Equipment Lifecycle
As Fornnax’s authorised service partner, Mr. Baur will oversee the complete lifecycle support of the company’s equipment throughout the European Union. His responsibilities will include installation, commissioning, preventive maintenance, emergency repairs, and spare parts support across mechanical, hydraulic, and electrical systems.
Looking ahead, he also plans to develop a centralised spare parts distribution hub for European customers, particularly if Fornnax establishes a warehouse facility in Worbis to facilitate faster deliveries. To further strengthen service coverage, Mr. Baur intends to expand operations by adding two to three additional service teams and vehicles each year, progressively increasing capacity across the continent.
A Shared Commitment to Customer Excellence
Highlighting the strategic importance of the partnership, Mr. Jignesh Kundaria, Director and CEO of Fornnax, said:
“We strongly believe that by continuously improving our service quality and customer satisfaction index, we can build long-term relationships with our customers. Higher customer satisfaction leads to greater trust, which significantly increases repeat orders and ultimately drives sustained growth in our sales revenue.”
This customer-first philosophy underpins Fornnax’s strategy of building a dedicated European service partner network instead of relying solely on remote support. With Mr. Baur joining this network, customers across the European Union will benefit from faster response times, expert technical assistance, and dedicated on-ground support from a partner with extensive experience in high-throughput shredding operations.
Mr. Baur’s appointment also reflects Fornnax’s broader ambition to establish itself as the preferred shredding solutions provider for the European recycling industry, marking another important milestone in the company’s international growth strategy.
Concrete
Nuvoco Vistas launches Limla cement plant, expands Gujarat footprint
Published
2 weeks agoon
July 13, 2026By
admin
Nuvoco Vistas opens a 2 MMTPA grinding unit at Limla, entering Gujarat and advancing its target of 35 MMTPA capacity by FY 2028.
Surat (Gujarat)
Nuvoco Vistas Corporation Ltd, a part of Nirma Group and one of India’s leading building materials company, has inaugurated the Limla Cement Plant in Surat (Gujarat), one of Vadraj Cement Limited’s (VCL) principal manufacturing facilities. The commissioning represents a key milestone in Nuvoco’s acquisition and restoration of VCL, while supporting the company’s expansion across the Western Indian cement market.
Vadraj Cement Limited is a subsidiary of Nuvoco Vistas Corporation Limited and has installed cement capacity of 6 MMTPA across its assets. The Limla inauguration therefore represents the first operational step in the acquired platform’s wider revival, while the Kutch facilities provide clinker supply, mineral security and coastal logistics support for the western business.
Nuvoco completed its acquisition of Vadraj Cement Limited, then under the Corporate Insolvency Resolution Process, after paying a consideration of Rs 1,800 crore in June 2025. VCL’s asset portfolio comprises a clinker unit at Kutch and a grinding unit at Limla in Surat. It also includes high-quality captive limestone reserves and a captive jetty at Kutch, supporting more efficient logistics. Following the takeover, Nuvoco began an extensive programme of restoration, refurbishment and expansion at both locations, leading to the commissioning of the Limla plant.
The Limla Cement Plant is expected to support a phased increase in sales volumes across Gujarat. It will also help Nuvoco supply neighbouring markets in Western Maharashtra and release cement capacity from its northern plants, which can consequently be redirected towards markets in North India. The plant will manufacture a full portfolio comprising Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. It will additionally produce the complete Nuvoco Duraguard range, including the premium Nuvoco Duraguard Microfibre product. The acquisition is also expected to generate operational synergies with Nuvoco’s existing plants at Nimbol and Chittorgarh in Rajasthan, improving logistics optimisation and market reach across important regional markets.
The grinding unit at the Limla Cement Plant was completed ahead of schedule, with 2 MMTPA of capacity now inaugurated to expand Nuvoco’s operating scale and customer reach. After Vadraj Cement’s assets become fully operational, plants in North and West India are expected to account for nearly 40 per cent of Nuvoco’s total cement capacity. This will broaden the company’s manufacturing network, strengthen access to high-growth markets and support its plan to increase consolidated cement capacity to 35 MMTPA by FY 2028, reinforcing its longer-term growth strategy.
Commenting on the development, Jayakumar Krishnaswamy, Managing Director, Nuvoco Vistas Corp Ltd, said: “The inauguration of the Limla Grinding Unit in Surat is an important milestone in Nuvoco’s growth journey and demonstrates our commitment to disciplined, value-accretive expansion. Gujarat is strategically significant for Nuvoco, with substantial opportunities arising from infrastructure investment, industrial growth, rapid urbanisation and continuing demand from the housing and construction sectors. The facility strengthens our regional footprint, improves operational flexibility and increases our ability to serve customers across northern and western markets with greater reliability and efficiency.”
He added: “Through the Vadraj acquisition, we have refurbished and restarted a strategically important asset, returning it to operations in record time through strong execution and collaboration between teams. The achievement demonstrates our ability to create value from acquired assets, fulfil our commitments and retain the confidence of stakeholders. It also highlights the strength of our project delivery capabilities and our continued focus on building sustainable, profitable growth over the long term.”
Nuvoco Vistas Corporation Limited is a building materials company whose vision is to build a safer, smarter and more sustainable world. It is among the leading players in East India and has a significant presence across North and West India. Nuvoco began operations in 2014 with a greenfield cement plant at Nimbol, Rajasthan. It later acquired Lafarge India Limited, which had entered India in 1999, followed by Emami Cement Limited in 2020 and Vadraj Cement Limited in April 2025. The company has also announced an expansion in eastern India through a new grinding mill at the Arasmeta Cement Plant, supported by several debottlenecking programmes involving equipment upgrades, process improvements and internal capacity initiatives. These developments place Nuvoco on track to achieve total cement capacity of approximately 35 MMTPA. The company reported total income of Rs 11,362 crore in FY 2025-26, reflecting its continuing growth trajectory.
Nuvoco operates a diversified portfolio across three segments: Cement, Ready-Mix Concrete and Modern Building Materials. Its cement portfolio includes Concreto, Duraguard, Double Bull, PSC, Nirmax and Infracem, covering Ordinary Portland Cement, Portland Slag Cement, Portland Pozzolana Cement and Portland Composite Cement. Its pan-India RMX business provides value-added products under Concreto for performance concrete, Artiste for decorative concrete, InstaMix for ready-to-use bagged concrete, X-Con covering M20 to M60 grades, and Ecodure for specialised green concrete. Nuvoco has supplied materials to projects including the Mumbai-Ahmedabad Bullet Train, Birsa Munda Hockey Stadium in Rourkela, Aquatic Gallery at Science City in Ahmedabad, and metro railway projects in Delhi, Jaipur, Noida and Mumbai.
Concrete
Green Construction Through Cement Innovation
Published
4 weeks agoon
July 2, 2026By
admin
Indian Cement Review (ICR) and Fuller Technologies brought industry, policy and technology leaders together to discuss how cement innovation can drive green construction at scale, writes Rakesh Rao.
India is building at a pace few countries can match. Highways, airports, housing, logistics parks, industrial corridors and urban infrastructure are reshaping the country’s economic geography. But beneath this growth story lies a difficult question: can India continue to build at scale without locking itself into a high-carbon future?
That question formed the core of an online panel discussion titled “Driving Green Construction Through Cement Innovation”, organised by Indian Cement Review (ICR) in association with Fuller Technologies as the Presenting Partner on June 25, 2026. The webinar brought together experts from cement technology, R&D, global industry platforms, building performance policy and international development cooperation to examine how low-carbon cement and material innovation can accelerate India’s green construction transition.
The discussion came at a crucial time. India has committed to achieving net-zero emissions by 2070 and reducing the carbon intensity of its economy by 45 per cent by 2030. At the same time, the country’s construction sector is expanding rapidly, driven by urbanisation, infrastructure development, housing demand and industrial growth. Cement, as one of the most widely used construction materials, sits at the heart of this transition. It is indispensable to development, but also central to the challenge of reducing embodied carbon in buildings and infrastructure.
Moderated by Nitika Krishan, Senior Urban Infrastructure and Sustainable Policy Consultant, the panel featured:
- Kiranmai Sanagavarapu, Director, Low Carbon Solutions, Fuller Technologies;
- Dr Hemantkumar Aiyer, VP and Head R&D, Nuvoco Vistas Corp Ltd;
- Devika Wattal, Innovation Lead, Global Cement and Concrete Association (GCCA);
- Dr Sunita Purushottam, MD, GBPN India (Global Buildings Performance Network); and
- Vaibhav Rathi, Senior Technical Advisor, GIZ (the German Agency for International Cooperation)
Setting the tone for the discussion, Nitika Krishan underlined the scale of the challenge before the sector. “The question before us is no longer whether we build, but how we build sustainably,” she said. She pointed out that construction accounts for nearly 40 per cent of global energy-related carbon emissions when both operational and embodied carbon are considered. Cement production, she added, remains one of the hardest industrial processes to decarbonise.
For India, this is not merely an environmental issue. It is a development issue, a competitiveness issue and increasingly, a market issue. As one of the world’s largest cement producers and among the fastest-growing construction markets, India’s material choices will influence the carbon trajectory of its built environment for decades. As Krishan observed, sustainability solutions in economies such as India must not remain limited to laboratory success. They must be scalable, commercially viable and practical at national level.
The innovation gap: From technology to market
Experts believe that there is a need to bridge the innovation gaps for making decarbonisation in cement and concrete scalable. Devika Wattal of GCCA, explained, “The starting point must be the core cement manufacturing process itself. The first and foremost is the heart of our process, the heart of cement manufacturing. How do we reduce clinker? That is always a topic where industry is working very intrinsically.”
Clinker reduction remains one of the most important pathways for lowering emissions in cement. Since clinker production is energy-intensive and chemically emits carbon dioxide, reducing the clinker factor through supplementary cementitious materials (SCMs), blended cements and new chemistries can have a significant impact. Wattal also noted that carbon capture, utilisation and storage (CCUS) will have a role, though it may not be the first lever for all markets.
However, she stressed that innovation cannot stop at technology development. A solution that works in the lab must also be adaptable to industry, scalable in production and acceptable in construction practice. “It is important for that innovation to be adaptable, to be scalable, and so that it can be executed in real time,” she said.
Wattal also called for stronger enabling systems around innovation. These include performance-based standards, product-level embodied carbon databases and clearer frameworks for evaluating green materials. Without these, low-carbon cement products may struggle to compete with conventional materials in procurement and design.
R&D must balance carbon, cost and performance
Bringing in the R&D perspective into the discussion, Dr Hemantkumar Aiyer of Nuvoco Vistas emphasised that low-carbon cement development cannot be treated as a single-variable exercise. Cement must perform in real construction conditions. It must deliver strength, durability, consistency and cost competitiveness, while also reducing carbon.
“The root of understanding and balancing all these aspects lies in materials, and knowing the materials,” he said.
According to Dr Aiyer, R&D teams must understand the variability of raw materials such as fly ash, slag and clinker. Different sources produce different material behaviours. This makes mix optimisation, material characterisation and processing-property relationships critical. When performance is affected, cement manufacturers must understand how strength enhancers, admixtures and other performance chemicals interact with the material system.
He also linked material science with process efficiency. Clinkerisation takes place at extremely high temperatures, around 1,400 to 1,450 degrees Celsius. Any improvement in raw mix design, process control or energy optimisation can, therefore, help reduce emissions and cost. Dr Aiyer pointed to artificial intelligence-based optimisation, Cement 4.0 tools and advanced software as important enablers for real-time process and material control.
“The more you understand the materials, the more you can control it,” he said.
LC3: The promise is proven, the sequencing is not
Limestone calcined clay cement, commonly referred to as LC3, has attracted global attention because it can reduce clinker content significantly by using calcined clay and limestone while maintaining performance in many applications. Kiranmai Sanagavarapu of Fuller Technologies said the technology itself has already moved beyond proof of concept. Fuller Technologies has worked with calcined clay technology for nearly two decades and has seen plants running in France and Ghana. These plants, she said, are meeting local and national specifications, while the economics are beginning to make sense.
“The calciner is performing, the economics is stacking up, it is making business sense to produce,” she said.
But if the technology is viable, why has adoption not scaled faster? For Sanagavarapu, the answer lies in project sequencing. Too often, clay characterisation happens after equipment is specified. This, she warned, is a backward approach because calciner design depends on clay mineralogy, kaolinite content, iron levels, reactivity, moisture and other variables.
“If you don’t know what your deposit looks like before you commit for the equipment, you are, in a way, going blind into designing,” she said.
She also identified permitting and plant integration as major bottlenecks. Environmental clearances, mining permissions and local regulatory approvals must begin early. Similarly, calcined clay must be integrated into existing grinding, blending and logistics systems from the design stage, not treated as an afterthought during commissioning.
India already has IS 18189:2023 standard for LC3, but Sanagavarapu pointed out that the standard is not yet visible enough in procurement documents. “The gap between what is technically being permitted and what the procurement is asking is the single biggest bottleneck,” she said.
In her view, successful scale-up depends on getting the sequence right: clay characterisation first, permitting in parallel, standards aligned with construction, and integration built into plant design.
India’s LC3 journey: Progress, but demand remains thin
Providing details of India’s LC3 commercialisation experience, Vaibhav Rathi of GIZ noted that JK Cement carried out the first commercial production of LC3 at its Rajasthan plant, followed by JK Lakshmi Cement three months later. These initiatives were supported by the International Climate Initiative of the Government of Germany, with IIT Delhi contributing deep institutional knowledge on LC3 research and BIS certification.
Rathi said India’s early experience has produced clear lessons. One of the biggest was the need to build capacity among regulators. While BIS certification existed, State Pollution Control Boards were unfamiliar with the technology and unsure about the approval pathway.
“The capacity building is not just needed amongst the producer and the users of the cement, but also the regulators who are working with this technology for the first time,” he said.
He also highlighted the need for better information on China clay deposits. Since China clay is currently classified as a minor mineral, centralised data on availability, quality and location is limited. If cement manufacturers are to adopt LC3 at scale, stronger mineral intelligence will be important.
The third issue is demand. LC3 has already been used in projects such as Palava City in Mumbai and Noida International Airport, but these remain limited examples. “It is in a chicken and egg situation,” Rathi said. “Cement companies are saying we need more demand, and users are saying there is not enough cement available.”
Public procurement, he suggested, could help break this cycle. If agencies such as CPWD and other public bodies begin testing, accepting and specifying LC3, it could create the market confidence needed for cement companies to invest in production and storage.
Building codes must catch up with innovation
Dr Sunita Purushottam of GBPN India argued that material choices will determine built environment emissions over the long term, but India’s current policy signals remain fragmented. Although LC3 has received BIS recognition, she pointed out that building codes, municipal bylaws, schedules of rates and sustainability codes do not yet provide uniform guidance on low-carbon cement.
“The current cement regulations are largely prescriptive and favouring traditional materials,” she said. This limits the ability of alternative materials to compete on performance, durability and emissions.
Dr Purushottam also raised the issue of taxation. Cement, including LC3, currently falls under the same GST bracket as conventional cement. A differentiated tax structure, she argued, could help accelerate market adoption. “In order for the market to demand LC3, that differentiation in the GST could go a long way,” she said.
She noted that green building certifications such as IGBC and GRIHA are already creating demand for low-carbon materials by assigning points for embodied carbon and sustainable material use. However, she said large-scale adoption will require regulatory mandates, particularly through building codes and state-level notifications.
She also cautioned that low-carbon cement alone does not solve the entire building performance problem. A material may reduce embodied carbon, but the operational carbon of a building depends on thermal performance, design, insulation and energy use. “The energy part has two elements,” she said. “One is the embodied carbon of the material itself, and the other is the operational carbon.”
Collaboration is the bridge between invention and impact
Wattal said GCCA sees innovation as a strategic priority and works through platforms that connect industry with academia and start-ups. “There is no way we will decarbonise our sector without innovation,” she said.
However, she stressed that research must be connected to actual industry challenges. Innovations developed in isolation may fail when they encounter real-world barriers such as raw material variability, plant integration, cost, standards and finance. Start-ups, too, need industry mentorship and scale-up pathways.
Wattal also flagged the importance of finance. Even strong technologies may struggle to attract investment if there is no common understanding of bankability. “We have always put projects into, is this a bankable project? But the definition of a bankable project has never been defined,” she said.
For India, she saw strong potential in its academic and start-up ecosystem, but said the challenge lies in alignment and prioritisation. The country has the research base, industrial capacity and market size. What it now needs is a coordinated route from innovation to deployment.
There is a practical concern for cement manufacturers: how can existing plants be adapted for lower emissions without compromising reliability or commercial viability?
Kiranmai Sanagavarapu addressed, “The reliability risk in calcined clay retrofit is definitely real, but it is almost always self-inflicted. The risk arises when a new process is added to an existing circuit without properly redesigning grinding and blending configurations.”
Existing cement plants, she explained, can take two broad routes. The first is external sourcing of calcined clay combined with mill optimisation. This requires lower capital investment and can potentially move in 12 to 18 months if other conditions are in place. It may reduce emissions by around 20 to 30 per cent. The second route is integrated calcination on site, which requires higher capital expenditure and longer lead times, but provides greater control over quality, supply and emissions reduction potential.
For Sanagavarapu, the principle is simple: low-carbon retrofits must be designed with intent. “Design it with an intent properly from the start. Start in the market conditions where the economics are already working,” she said.
Circularity: The overlooked advantage
According to Vaibhav Rathi, fly ash and slag are already well established in cement and construction (C&D), but construction and demolition waste remains underutilised. “C&D waste is a growing business opportunity which not many have taken up,” he said. India’s continuous construction and demolition activity creates huge volumes of waste, much of which contributes to air pollution, land degradation and material inefficiency. With the right processing and standards, this waste can be converted into useful construction products.
Rathi also pointed out that LC3 has a circular economy dimension that is often overlooked. It can use low-grade kaolin-rich clay left behind after high-grade clay is extracted for other applications. “LC3 is not only a low-carbon solution, but also a circular economy solution,” he said.
At the same time, he cautioned that LC3 in India is not yet cheap because it has not reached scale. Site-specific techno-commercial feasibility studies, supported jointly by development agencies and industry, could help companies assess whether LC3 production makes technical and financial sense at a given location.
Dr Purushottam added that India must address both low-carbon cement and construction waste together. “Both low-carbon cement and C&D waste go hand in hand. India does not have an option but to work on both,” she said.
Dr Aiyer called for policy shifts from both government and industry, including preferential purchasing of sustainable materials, minimum supplementary cementitious material requirements in public and public-private projects, and faster regulatory implementation. “If we can fast-track the regulatory standards and their implementation on the ground, that is the way to go,” he said.
From green ambition to green construction
Cement innovation is no longer only about chemistry. It is about systems. Low-carbon cement will scale only when technology, standards, procurement, finance, regulation, education and construction practice move together.
LC3 and other low-carbon technologies have shown promise. India has early commercial examples, strong research capability and growing market interest. But mainstream adoption will depend on whether demand can be created, regulators can be capacitated, standards can be embedded in procurement, and manufacturers can see a clear business case.
For a country building at India’s scale, the opportunity is enormous. Cement will continue to be central to infrastructure and urban development. The challenge now is to ensure that the cement used in India’s growth story carries a lower carbon burden.
- Rakesh Rao
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