# Textiles

> The Textiles playbook is jouleWise's typical engineering approach for textile mills and processing houses: most of your heat is below 100 °c.

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

## In short

One provider for green electricity, green heat and the data that proves both — from spinning floor to dye house to export container. For a spinner, weaver or processor, decarbonisation now decides which brand programmes you stay in. Six pressures point at the same metered data. Wet processing is a hot-water business: most baths run between 40 and 98 °C, well inside heat pump range. The high-temperature exceptions — HT polyester dyeing and stenters — stay on steam or thermic fluid, with their exhaust heat recovered.
## Most of your heat is below 100 °C.

- **The situation.** A textile processing unit runs on hot water. Desizing, scouring, bleaching, dyeing and washing heat large volumes of water to 40–98 °C, mostly with coal, biomass or PNG boilers and thermic fluid heaters — then send that water, still warm, to the effluent plant. Many global brands have committed to phasing coal out of their tier 1 and tier 2 supply chains, and ask mills for renewable electricity and Scope 1 and 2 data.
- **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: <b>green electricity</b> — intrastate and ISTS solar and wind, rooftop solar, BESS and green-market purchase, each source orchestrated to fulfil industrial demand at least cost; <b>ABT metering and data loggers</b> on every source and load; <b>green heat</b> from industrial heat pumps up to 120 °C; <b>ergOS</b> to meter and orchestrate both every 15 minutes; <b>esgOS</b> 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). Heat pumps then recover heat from warm effluent and deliver dye-house hot water — on green electricity, cheaper than coal-fired heat and close to zero-carbon.
- **How to engage.** Four models, mix and match: <b>Advisory</b>, <b>SaaS</b> (ergOS + esgOS), <b>Heat Advisory</b>, and <b>Heat as a Service</b>, where you pay per unit of heat and invest nothing upfront.
- **First step.** A four-week decarbonisation baseline on one mill: electricity bills, load survey, coal and fuel records, and portable heat metering on dyeing, washing and effluent streams — ending in one business case for electricity, heat and ESG.

## Why now: Your brands are phasing out coal.

For a spinner, weaver or processor, decarbonisation now decides which brand programmes you stay in. Six pressures point at the same metered data.

- **Brand supplier targets.** Global apparel and home-textile brands have set supply-chain emission targets and ask tier 1 and tier 2 mills for renewable electricity, Scope 1 and 2 data and a coal exit plan.
- **Coal phase-out.** Coal-fired boilers and thermic fluid heaters are the single largest source of a mill's emissions — and the first thing brand audits ask about.
- **EU product rules.** The EU's ecodesign rules are moving textiles towards digital product passports that carry environmental data back to the mill.
- **Heat and electricity cost.** Hot water and drying are the largest energy costs in wet processing; spinning and weaving run three shifts on electricity. Both go straight to margin.
- **Water and effluent.** ZLD and discharge norms tie water, heat and chemicals together. Cooler, cleaner effluent helps the ETP as well as the heat balance.
- **Carbon markets.** Textiles is among the sectors named for emission-intensity targets under India's Carbon Credit Trading Scheme. Mills that measure now are ready.

## The intervention map: Every bath has a lever.

Bales arrive, yarn is spun and woven, fabric is scoured, dyed, washed and dried, finished goods leave in containers. jouleWise acts at ten points — most of them on hot water.

1. **Green sourcing** (power, Electricity). Intrastate and ISTS solar and wind contracted through open access for a three-shift load.
2. **Connectivity and metering** (power, Electricity). Open access approvals, connection agreement and ABT metering at the mill incomer.
3. **Rooftop solar** (power, Electricity). Spinning and warehouse roofs carry behind-the-meter solar, sized from measured load.
4. **Battery storage** (power, Electricity). LFP storage for peak shaving and to keep spinning frames and humidification steady.
5. **Heat pumps on dye-house water** (heat, Heat). Hot water for scouring, bleaching, dyeing and washing made by heat pumps instead of coal steam.
6. **Effluent heat recovery** (heat, Heat). Warm dye and wash effluent becomes the heat pump source — and reaches the ETP cooler.
7. **Hot-water store** (heat, Heat). Store charged in solar blocks and drawn batch by batch across the day.
8. **Stenter exhaust recovery** (heat, Heat). Stenters stay on thermic fluid; their exhaust heat is recovered into the hot-water circuit.
9. **ergOS control** (data, Data · ergOS). 15-minute metering of electricity, steam, hot water, fuel and water — per machine where it matters.
10. **Brands and exports** (esg, ESG · esgOS). Brand questionnaires, coal-exit evidence and per-kg fabric carbon from esgOS.

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

## Green electricity: Low-cost green electricity.

Spinning and weaving run three shifts with humidification and compressed air; processing adds pumps, jets and dryers. The load is high day and night — heat pump load moves into solar hours with a hot-water store.

- **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: The boiler, reinvented.

Wet processing is a hot-water business: most baths run between 40 and 98 °C, well inside heat pump range. The high-temperature exceptions — HT polyester dyeing and stenters — stay on steam or thermic fluid, with their exhaust heat recovered.

| Duty | Temperature | Heat pump? |
|---|---|---|
| Desizing and scouring (cotton preparation) | 60–95 °C | yes |
| Peroxide bleaching (continuous or batch) | 80–98 °C | yes |
| Reactive dyeing (cotton and blends) | 40–80 °C | yes |
| Washing-off and soaping (after dyeing) | 60–95 °C | yes |
| Size cooking (weaving preparation) | 75–90 °C | yes |
| Process water preheat (make-up and rinse water) | 20–60 °C | yes |
| HT disperse dyeing (polyester · remains on steam) | 125–135 °C | stays on fuel |
| Stenters and dryers (thermic fluid · exhaust recovered) | 150–200 °C | stays on fuel |

- **Heat sources we reuse.** Warm effluent from dye and wash baths, stenter exhaust, condensate and air-compressor heat — much of a mill's heat currently goes down the drain.
- **Effluent as the source.** Effluent at 40–60 °C is an excellent heat pump source: the small temperature lift means a high COP, and cooler effluent eases the load on the ETP.
- **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 |
| Heat pump on DISCOM electricity (₹8.5/kWh · COP 3.8) | 2.24 | 0.188 |
| Heat pump on green open access (₹5.5/kWh landed · COP 3.8) | 1.45 | 0.000 |
| Heat pump in solar blocks + store (₹4.0/kWh · COP 3.8) | 1.05 | 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 3.8 reflects hot water near 85 °C drawn from warm dye-house effluent; 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% boiler efficiency.

## 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, heat pump shortlist for dyeing, washing and effluent recovery, and the ESG 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). One effluent-source heat pump and hot-water store on the dye house, metered on ergOS; then washing ranges, bleaching and stenter exhaust. 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

A processing house runs three shifts, so the dye-house hot water is a flat load and the heat pumps run round the clock. The store is charged in solar hours and drawn down at night, which flattens what the grid sees.
## Facts

- Heat duties and temperatures: Desizing and scouring 60–95 °C (heat pump); Peroxide bleaching 80–98 °C (heat pump); Reactive dyeing 40–80 °C (heat pump); Washing-off and soaping 60–95 °C (heat pump); Size cooking 75–90 °C (heat pump); Process water preheat 20–60 °C (heat pump); HT disperse dyeing 125–135 °C (stays on fuel); Stenters and dryers 150–200 °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
- Heat pump on DISCOM electricity: ₹2.24 per kWh of useful heat, 0.188 kg CO₂/kWh-th
- Heat pump on green open access: ₹1.45 per kWh of useful heat, 0.000 kg CO₂/kWh-th
- Heat pump in solar blocks + store: ₹1.05 per kWh of useful heat, 0.000 kg CO₂/kWh-th
- Plant areas with a lever: Dye-house hot water, Scouring and washing, Effluent heat recovery, Drying and stenter, Spinning-floor HVAC.

## 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 3.8 reflects hot water near 85 °C drawn from warm dye-house effluent; 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% boiler efficiency.
- 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 Textiles sector deck](https://joulewise.com/downloads/joulewise-textile.html)
- [Heat Pump Studio](https://joulewise.com/studios/heat-pump)
- [Discuss your plant](https://joulewise.com/contact)

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