# Cement

> The Cement playbook is jouleWise's typical engineering approach for cement plants: the kiln stays. everything around it moves.

Canonical: https://joulewise.com/industries/cement  
Publisher: jouleWise Advisory Services Pvt Ltd, Noida, India · Spain  
Reviewed: 2026-10-08  
Status: company page

## In short

One provider for green electricity, recovered heat and the data that proves both — from the quarry to the bag. For a cement producer, the levers that remain are electrical, thermal recovery and data — and all three are now scored by regulators and buyers. Six pressures point at the same metered data. Cement is the exception in this stack. The kiln, precalciner and raw-mill dryers sit far above any heat pump and stay fuel-fired. The levers are recovering the heat the plant already makes — to electricity through WHRS and to drying — and using heat pumps only where the heat is genuinely low grade.
## The kiln stays. Everything around it moves.

- **The situation.** Cement is two problems in one plant. Most of its CO₂ comes from limestone calcination and kiln fuel — chemistry and high-temperature heat that no heat pump can touch. The rest is electricity: crushers, raw mills, fans, cement mills and packing, typically 70–100 kWh per tonne, running around the clock. That electricity, the heat already leaving the cooler and preheater, and the way mills are scheduled are where jouleWise works.
- **The gap.** Electricity, heat and ESG reporting are bought from different vendors on different clocks. Solar is sized without the heat load; boilers are replaced without a plan for low-cost electricity; ESG data is typed in once a year. Each fix leaves money and carbon on the table.
- **What we do.** jouleWise runs the whole decarbonisation stack: green electricity — intrastate and ISTS solar and wind, rooftop solar, BESS and green-market purchase, each source orchestrated to fulfil industrial demand at least cost; ABT metering and data loggers on every source and load; green heat from industrial heat pumps up to 120 °C; ergOS to meter and orchestrate both every 15 minutes; esgOS to turn the same data into audit-ready disclosure.
- **Why it compounds.** Low-cost green electricity lowers the cost of every unit of heat a heat pump makes. Thermal storage lets that heat be made in the cheapest solar blocks. ergOS proves it; esgOS reports it. Savings from one layer fund the next.
- **The value.** Up to 25% lower electricity cost on DISCOM tariff and up to 65% renewable share (reported, year 1 of ergOS). Grinding shifted into the cheapest, greenest blocks, waste heat recovery run against actual kiln operation, and a metered emission-intensity baseline ready for the Carbon Credit Trading Scheme.
- **How to engage.** Four models, mix and match: Advisory, SaaS (ergOS + esgOS), Heat Advisory, and Heat as a Service, where you pay per unit of heat and invest nothing upfront.
- **First step.** A four-week decarbonisation baseline on one plant: electricity bills and 15-minute data, WHRS performance, mill scheduling, electrical and thermal energy per tonne, and the ESG and GEI data map — ending in one business case.

## Why now: The chemistry is fixed. The electricity bill is not.

For a cement producer, the levers that remain are electrical, thermal recovery and data — and all three are now scored by regulators and buyers. Six pressures point at the same metered data.

- **Electricity is a top-three cost.** Electricity runs 70–100 kWh per tonne of cement, around the clock. A rupee off the landed cost repeats on every tonne for the life of the contract.
- **Carbon Credit Trading Scheme.** Cement is among the first sectors brought under greenhouse-gas emission-intensity targets in India. Meeting them — or earning credits — starts with a metered, verifiable baseline.
- **CBAM.** Cement is covered by the EU's carbon border mechanism. Clinker and cement reaching the EU, directly or through customers, need verified embedded emissions.
- **Waste heat already paid for.** Preheater and cooler exhaust carry heat worth a large share of the plant's own electricity demand. WHRS only pays if it is sized, run and measured properly.
- **Green procurement.** Infrastructure buyers, green building ratings and blended-cement specifications increasingly ask for per-tonne carbon, EPDs and renewable share.
- **Disclosure.** BRSR Core-format reporting, lender diligence and customer value-chain requests all draw on the same plant data.

## The intervention map: Quarry to bag. Eleven levers, none inside the kiln.

Limestone is crushed and stacked, raw meal is preheated and burnt, clinker is cooled, ground with gypsum, fly ash or slag, stored and packed. jouleWise acts at eleven points — electrical, thermal recovery and data, never inside the kiln chemistry.

1. **Green sourcing** (power, Electricity). Intrastate and ISTS solar and wind contracted through open access for a flat 24×7 load — the largest single lever in cement.
2. **Connectivity and metering** (power, Electricity). Open access approvals, connection agreement and ABT metering at the 132 or 220 kV incomer.
3. **Solar on plant land** (power, Electricity). Ground-mounted and rooftop solar on land the plant already owns, sized from measured load.
4. **Battery storage** (power, Electricity). LFP storage to shave peaks, ride through grid events and firm the solar block.
5. **Waste heat recovery electricity** (heat, Heat). Preheater and cooler heat to WHRS electricity — benchmarked, then run and metered against actual kiln operation.
6. **Cooler heat to drying** (heat, Heat). Cooler vent air and kiln gases routed to raw, coal and slag mill drying before any fuel is burnt for it.
7. **Heat pumps where heat is low grade** (heat, Heat). Colony, canteen and workshop hot water and low-temperature drying air — the slice of cement heat a heat pump can actually serve.
8. **Mill scheduling against price** (data, Data · ergOS). Grinding is the plant's flexible load. ergOS moves mills into the cheapest, greenest blocks within silo and despatch limits.
9. **ergOS control** (data, Data · ergOS). 15-minute metering of every mill, fan, drive and WHRS train; forecasting, scheduling and trading.
10. **Per-tonne disclosure** (esg, ESG · esgOS). kWh and kg CO₂ per tonne of cement, EPD inputs, BRSR Core-format and customer disclosures from esgOS.
11. **Quarry and logistics** (esg, ESG · esgOS). Limestone, fuel, fly ash and slag movement for Scope 3 and the emission-intensity baseline.

Illustrative plant. Actual intervention map built site by site in the baseline.

## Green electricity: Low-cost green electricity.

A cement plant is a heavy, flat, round-the-clock load with one large flexible block: grinding. We size the green portfolio to the flat load — and move the mills into the solar hours.

- **Plan.** Meter-data due diligence: bills, load survey, rooftop and captive parameters. Solar, wind, hybrid, BESS and exchange electricity optimised together, capex or opex, with each state's ToD, banking and open access charges in the landed-cost model. Outcome: RE-100 roadmap · size, location, savings, NPV
- **Implement.** RfP over a 25-year horizon, developer evaluation, reverse auction, PPA and shareholder agreements (26% SPV equity for captive status), open access approvals and connection agreement. Outcome: Green electricity contracted · ~3 months once planning closes
- **Meter and log.** ABT meters at injection and drawal points — main and check meters on CTs and PTs of the required accuracy class — plus data loggers on every incomer, heat pump, steam, fuel and water line. Installed, tested, sealed and linked to the SLDC and to ergOS. Outcome: Every source and load visible in 15-minute blocks
- **Orchestrate.** ergOS forecasts 96 blocks, schedules with the SLDC, trades DAM, GDAM, RTM and GTAM, manages banking and battery health — and now dispatches heat pumps and thermal storage against price. Outcome: For the life of the assets

## Heat: Recover first. Then electrify.

Cement is the exception in this stack. The kiln, precalciner and raw-mill dryers sit far above any heat pump and stay fuel-fired. The levers are recovering the heat the plant already makes — to electricity through WHRS and to drying — and using heat pumps only where the heat is genuinely low grade.

| Duty | Temperature | Heat pump? |
|---|---|---|
| Colony, canteen and workshop (hot water) | 40–60 °C | yes |
| Low-moisture additive drying (drying air) | 50–90 °C | yes |
| Coal and pet-coke mill drying (drying air) | 60–100 °C | yes |
| Slag and fly-ash drying (kiln or cooler gases) | 140–200 °C | stays on fuel |
| Raw mill drying (kiln gases — fuel-fired) | 150–200 °C | stays on fuel |
| Precalciner (≈850–900 °C · fuel-fired) | 850–900 °C | stays on fuel |
| Kiln burning zone (≈1,450 °C · fuel-fired) | 1450–1450 °C | stays on fuel |

- **Heat sources we reuse.** Clinker-cooler vent air, preheater exhaust, compressor and grinding-circuit heat — a cement plant makes far more heat than it can use.
- **Recovery before replacement.** In cement the first question is never which heat pump. It is whether the heat already leaving the cooler and preheater is being used — for electricity through WHRS and for drying — before anything new is bought.
- **Sized from metered heat.** Portable heat meters log flow and temperature on candidate processes for two to four weeks before anything is sized.

## Economics: Low-cost electricity drives low-cost heat.

What one kWh of useful process heat costs, and what it emits, depending on where the heat comes from. The heat pump cuts cost on any electricity; green electricity is what cuts the carbon.

| Route | ₹ per kWh of useful heat | kg CO₂ per kWh-th |
|---|---|---|
| PNG-fired boiler (₹55/SCM · 85% efficiency) | 6.22 | 0.221 |
| Diesel (HSD) boiler (₹90/L · 85% efficiency) | 10.59 | 0.315 |
| Coal-fired boiler (₹8,000/t · 4,000 kcal/kg · 75% efficiency) | 2.29 | 0.487 |
| Pet-coke fired kiln fuel (₹14,000/t · 8,000 kcal/kg · shown for reference) | 2.01 | 0.473 |
| Heat pump on DISCOM electricity (₹8.5/kWh · COP 3.5) | 2.43 | 0.205 |
| Heat pump on green open access (₹5.5/kWh landed · COP 3.5) | 1.57 | 0.000 |
| Heat pump in solar blocks + store (₹4.0/kWh · COP 3.5) | 1.14 | 0.000 |

Illustrative only, not an offer. Assumptions: PNG 10.4 kWh/SCM, 1.95 kg CO₂/SCM; HSD 10.0 kWh/L, 2.68 kg CO₂/L; grid 0.716 kg CO₂/kWh (CEA baseline order of magnitude); green electricity treated as zero-emission on a market basis with green attributes retired. Heat pump COP 3.5 reflects hot water near 60 °C for colony, canteen and workshop, and low-temperature drying air; COP falls as delivery temperature rises. Tariffs, fuel prices and COP vary by site and are replaced with metered values in the baseline. Coal: ₹8,000/t, 4,000 kcal/kg (4.65 kWh/kg), 1.7 kg CO₂/kg, 75% efficiency. Pet coke: ₹14,000/t, 8,000 kcal/kg (9.3 kWh/kg), 3.3 kg CO₂/kg, shown for reference only — kiln and precalciner heat is not addressable by heat pumps, so the comparison applies to the plant's low-temperature heat.

## Roadmap: Baseline. Electricity. Heat. Proof.

1. **Baseline** (Weeks 1–4). Bills, load survey, fuel and steam records, portable heat metering on candidate processes, ESG data map. Outcome: Signed-off energy, heat and carbon baseline
2. **Roadmap** (Weeks 4–8). RE-100 electricity plan, waste-heat and WHRS review, a mill-scheduling model, and the ESG and emission-intensity data map — in one business case. Outcome: One business case — electricity, heat, ESG
3. **Meter and log** (Weeks 6–12). ABT metering at the incomer and data loggers on electricity, heat, fuel and water lines — the measured base every later step is sized, settled and reported on. Outcome: ergOS live on metered data
4. **Electricity live** (~3 months after roadmap). Open access contracted and approved; rooftop solar and BESS where they fit; every source orchestrated against demand on ergOS. Outcome: Green electricity flowing
5. **Heat live** (Pilot, then scale). Waste heat first — WHRS optimisation and cooler heat into drying — then heat pumps on colony, workshop and low-temperature drying air. Outcome: Fuel displaced, measured on ergOS
6. **Operate and disclose** (Every block · every year). ergOS runs electricity and heat; esgOS publishes BRSR Core-format, CBAM, CDP and customer disclosures with an audit trail. Outcome: Assurance-ready numbers

Timelines indicative; confirmed after the baseline and dependent on state approvals and equipment lead times.

## 24-hour dispatch

No heat pumps in the picture: cement's flexible load is grinding. The mills are the hatched block, moved into the solar hours within silo and despatch limits; the kiln runs flat underneath.
## Facts

- Heat duties and temperatures: Colony, canteen and workshop 40–60 °C (heat pump); Low-moisture additive drying 50–90 °C (heat pump); Coal and pet-coke mill drying 60–100 °C (heat pump); Slag and fly-ash drying 140–200 °C (stays on fuel); Raw mill drying 150–200 °C (stays on fuel); Precalciner 850–900 °C (stays on fuel); Kiln burning zone 1450–1450 °C (stays on fuel).
- PNG-fired boiler: ₹6.22 per kWh of useful heat, 0.221 kg CO₂/kWh-th
- Diesel (HSD) boiler: ₹10.59 per kWh of useful heat, 0.315 kg CO₂/kWh-th
- Coal-fired boiler: ₹2.29 per kWh of useful heat, 0.487 kg CO₂/kWh-th
- Pet-coke fired kiln fuel: ₹2.01 per kWh of useful heat, 0.473 kg CO₂/kWh-th
- Heat pump on DISCOM electricity: ₹2.43 per kWh of useful heat, 0.205 kg CO₂/kWh-th
- Heat pump on green open access: ₹1.57 per kWh of useful heat, 0.000 kg CO₂/kWh-th
- Heat pump in solar blocks + store: ₹1.14 per kWh of useful heat, 0.000 kg CO₂/kWh-th
- Plant areas with a lever: Grinding shifted into solar blocks, Waste heat recovery electricity, Cooler heat to drying, Open access at 132 or 220 kV, Per-tonne disclosure.

## Assumptions and limits

- Illustrative only, not an offer. Assumptions: PNG 10.4 kWh/SCM, 1.95 kg CO₂/SCM; HSD 10.0 kWh/L, 2.68 kg CO₂/L; grid 0.716 kg CO₂/kWh (CEA baseline order of magnitude); green electricity treated as zero-emission on a market basis with green attributes retired. Heat pump COP 3.5 reflects hot water near 60 °C for colony, canteen and workshop, and low-temperature drying air; COP falls as delivery temperature rises. Tariffs, fuel prices and COP vary by site and are replaced with metered values in the baseline. Coal: ₹8,000/t, 4,000 kcal/kg (4.65 kWh/kg), 1.7 kg CO₂/kg, 75% efficiency. Pet coke: ₹14,000/t, 8,000 kcal/kg (9.3 kWh/kg), 3.3 kg CO₂/kg, shown for reference only — kiln and precalciner heat is not addressable by heat pumps, so the comparison applies to the plant's low-temperature heat.
- Timelines indicative; confirmed after the baseline and dependent on state approvals and equipment lead times.

## Questions and answers

**Does it replace my boiler?**  
For loads up to 120 °C, yes — as the primary heat source. The boiler usually stays on standby and for any loads above that range.

**What if electricity is expensive?**  
Each kWh of electricity returns three to four kWh of heat, so heat costs roughly a third of the electricity price. On green open access, the carbon falls close to zero as well.

**What does the site need?**  
Spare electrical capacity, space near the heat users and a steady heat demand. A hot-water store smooths peaks and lets the unit run in the cheapest blocks.

**Is it proven?**  
It is the same refrigeration cycle as the chillers already on your site, run for heat. Industrial units are in service worldwide in food, chemicals, pharma and textiles.

## Related

- [The Cement sector deck](https://joulewise.com/downloads/joulewise-cement.pdf)
- [Heat Pump Studio](https://joulewise.com/studios/heat-pump)
- [Discuss your plant](https://joulewise.com/contact)

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