Imerys, Transform to perform

Reporting des indicateurs Energie & CO2


Sustainable development

Reporting des indicateurs Energie & CO2


Energy entering the reporting organization is made of:

  • Direct energy: primary energy used within the organization (e.g. coal or gas);
  • Indirect energy: secondary energy purchased (e.g. electricity or steam) which has been produced outside the reporting organization from a primary source.

Notes Provided to Contributors of Energy Data:
1.The indicator shows the energy use of the reporting organization as the difference between the flow of direct and indirect energy having entered the reporting organization during the period, minus sales, plus/minus stock changes (for liquid and solid fuels, biomass, etc.).

2. Fuel oil: All fuel oils (diesel, gasoline, etc.) bought by the site and consumed within the scope of the production process, whatever they are used for (contractors are excluded as well as delivery transportation of final products when this transportation is made by an outside company).


Production for a given period and for a given site, that can be a processing plant with its quarry, a quarry alone or a processing plant alone, represents the quantity of final products plus the change in stocks between the end and the beginning of the period in question.

Production must be stated as metric tons of dry product (dmt).
If a particular site comprises a quarry/mine and a processing plant, the quantity of products transferred from the quarry to the producing plant shall not be reported even if the energy used by the quarry is reported in Symphony.
If the site concerned is purely a quarry/mine without an associated processing plant, the site is considered as an independent energy consuming unit. Ore produced and shipped out should therefore be reported.
The purpose is to calculate for each appropriate site the KPI SEC (Specific Energy Consumption). SEC is the total energy use divided by the total of tons produced, whenever these tons are sold to a customer or are transferred to another site.


CO2 emissions from energy use are calculated by the software, using an emission factor database.
For electricity, the software takes into account an emission factor depending on the country where electricity has been produced (from International Energy Agency). For sites within the USA, the e-grid emissions factors are used.


Quantity calculated locally by the contributor with the carbon content and the decarbonation rate as a function of the raw material, or of additives, and the firing conditions. The values must remain coherent with any that have been declared to local authorities.

Adherence to the GHG Protocol
The GHG Protocol requires that companies make historic emission recalculations for structural changes. Structural changes trigger recalculation because they merely transfer emissions from one company to another without any change in emissions released to the atmosphere, for example, an acquisition or divestment only transfers existing GHG emissions from one company’s inventory to another. Historical data for 2010, 2009 and 2008 acquisitions and divestments have been recalculated according to the GHG Protocol.
With the following exceptions, Imerys reports in alignment with the Greenhouse Gas Protocol of the World Business Counsel on Sustainable Development (the GHG Protocol):

1. The GHG Protocol requires that all facilities within an organizational boundary are to be included in the reporting perimeter. To fully comply with the GHG Protocol, Imerys would need to include not only emissions form mining and minerals processing facilities, but also emissions from offices and all other facilities within its organizational boundary.
2. The GHG Protocol requires reporting of fugitive emissions from owned and controlled sites, and Imerys does not report on these fugitive emissions. Fugitive emissions result from intentional or unintentional releases (e.g., equipment leaks from joints, seals, packing, and gaskets; hydrofluorocarbon (HFC) emissions during the use of refrigeration and air conditioning equipment in buildings and cars; and methane leakages from gas transport).
3. The GHG Protocol requires reporting of emissions resulting from the combustion of fuels in company owned/controlled mobile combustion sources (e.g., trucks, trains, ships, airplanes, buses, and cars). Imerys does track mobile combustion sources for sites that have on-site filling stations. However, it is very likely that there are mobile combustion vehicles that “fill-up” at both Imerys and third-party filling stations. Additionally, mobile combustion vehicles that report to non-mining or mineral processing sites are highly likely to obtain fuel at third-party filling stations. To comply fully with the GHG Protocol, Imerys would need to include the fuel obtained from third-party filling stations.
4. The GHG Protocol guidelines state that emissions associated with the sale of own-generated electricity to another company are not deducted/netted from Scope 1 emissions. This treatment of sold electricity is consistent with how other sold GHG intensive products are accounted. The GHG Protocol however allows for emissions associated with the sale/transfer of own-generated electricity to be reported in optional information. Imerys calculates Direct Energy Use netting sold electricity.

For the purposes of reporting energy and CO2 data, Imerys has reported on all mining and mineral processing assets operated by Imerys. The term “assets operated by Imerys” includes joint ventures, partnerships and other similar business arrangements in which Imerys owns a controlling interest. For the purposes of reporting energy and CO2 data, the perimeter does not include offices.

Production data per site stated in dry metric tons were collected for 2009 and 2010, as were energy consumption data.
This allows the Group to directly calculate specific energy consumption (SEC) stated in GJ/t.
The SEC is Group KPI and is calculated at site level. For a given period and a given site SEC is the total energy net used divided by the total production of the site.
The total direct energy net used is the sum of direct plus indirect energy use minus energy sold to third parties.
Variance calculation

Group structure effect
The Group structure effect corresponds to the quantity of energy consumed by the sites acquired during the period, minus the consumption of closed or sold sites.

Activity variation effect (or volume effect)
This is the amount of energy that would have been consumed in year Y with the specific consumption of year Y-1.

Mix effect
This is the difference between the volume effect calculated overall for a set of plants and the sum of the volume effects of each plant in the set.

The “intra-plant” mix cannot be calculated here for want of a breakdown of production circuits and their respective energies.

Efficiency effect
This is the sum of the efficiency effects of each plant in a set. The efficiency effect of a plant corresponds to the energy resulting from the difference in specific consumption between year Y and year Y-1 at year Y activity levels.

Energy efficiency ratio
This is the ratio, for a set of plants, of the set’s efficiency effect to the sum of energy consumed in year Y for the set, plus the volume effect, plus the mix effect.

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