# How does a sponge iron plant in Barbil count power from its waste heat boiler?

Canonical: https://senseible.earth/answers/barbil-sponge-iron-plant-waste-heat-power

Power from a waste heat recovery boiler on the kiln adds no new fuel, because the coal is already counted in the kiln. Do not add a grid factor for it. Count the kiln coal once, by mass balance, and treat waste heat power as your own zero-fuel supply that cuts grid purchases.

## What to count

- Coal fed to the kiln, with carbon content from lab tests.
- Carbon left in sponge iron, char and dust.
- Grid power bought on top, at 0.710 kg CO2 per kWh.

## Waste heat power

Record generation from the turbine meter. It lowers Scope 2 by replacing grid units, but it is not a separate emission or a credit to subtract from Scope 1.

## For CBAM

Direct reduced iron is a precursor for steel. Your steel buyer needs the kiln figure per tonne of sponge iron; electricity is not charged for iron and steel.

## What Senseible does here

Senseible reads fuel, power and production records into dated, fingerprinted installation records, the starting point for the actual emissions your EU importer asks for.

- [Giridih sponge iron CBAM figure](https://senseible.earth/answers/giridih-sponge-iron-kiln-cbam-figure)
- [Kiln coal lab testing records](https://senseible.earth/answers/sponge-iron-kiln-coal-lab-testing-records)
- [Ferro alloy waste heat power](https://senseible.earth/answers/ferro-alloy-furnace-waste-heat-power-counting)

Sources: [Implementing Regulation (EU) 2023/1773, monitoring rules](https://eur-lex.europa.eu/eli/reg_impl/2023/1773/oj/eng), [IPCC 2006 Guidelines, Volume 2 Energy (fuel defaults)](https://www.ipcc-nggip.iges.or.jp/public/2006gl/vol2.html), [CEA CO2 Baseline Database, version 21.0](https://cea.nic.in/cdm-co2-baseline-database/?lang=en)

Last reviewed 2026-10-22.