Global Reporting Initiative Reports

GRI Indicator 302-4
Reporting Level Partial

Reduction of energy consumption

Note this response is cross-referenced for 302-1, 302-3, 302-4, 305-1, 305-2, 305-4, and 305-5.

302-1 – Energy consumption within the organization 

302-3 – Energy intensity 

302-4 – Reduction of energy consumption

305-1 – Direct greenhouse gas (GHG) emissions (Scope 1)

305-2 – Energy indirect greenhouse gas (GHG) emissions (Scope 2)

305-5 – Reduction of greenhouse gas (GHG) emissions

305-4 – Greenhouse gas (GHG) emissions intensity

This year Interpublic has continued our journey of calculating GHG emissions by expanding our boundary to now include offices over 50,000 square feet and all offices of every size in North America and the UK (including buildings under 50,000 square feet in these regions as well). The boundary was expanded from last year where we had included all offices over 50,000 square feet.  In this year’s disclosure, we report on 2017 and 2018 calendar year data utilizing this expanded boundary which now includes 54% of our worldwide headcount (up from 48%) and 65% of our worldwide square footage (up from 53%).


  • All Offices Worldwide Over 50,000 Square Feet (excluding the UK)
    Our Scope 1 and Scope 2 calculations for offices worldwide over 50,000 square feet in all countries besides the UK were completed using Measurabl, the online sustainability data software. Measurabl aligns its carbon accounting algorithms to the WRI/WBCSD’s GHG Protocol, Revised EditionTo calculate carbon emissions, we use US EPA e-Grid emissions factors for buildings within the United States and national-level emissions factors for buildings outside the United States.

All Offices Under 50,000 Square Feet in North America
For the US, we used the CBECS intensity factors for office buildings from US EIA (2012). Electric and natural gas intensity are provided by region (Midwest, Northeast, South, and West) in kWh/sqft/year for electricity and therms/sqft/year for natural gas.  The US emission factors for electricity come from the eGRID2016 database and depend on each office’s Zip Code which determines the eGRID subregion and its annual CO2e emission rate in kgCO2e/kWh. The natural gas emission factor was calculated based on the EPA Emission Factors for Greenhouse Gas Inventories (Nov 2015) by adding the CO2, CH4 and N2O emissions to obtain kgCO2e/therms.

For Canada, we used the intensity factors of the Commercial and Institutional Consumption of Energy Survey by Natural Resources Canada (2005). Energy intensity is provided by region (British Columbia, Ontario, Prairies, and Quebec) in GJ/m2. We determined the electric and natural gas intensities by multiplying the energy intensity for offices in the different regions with the percentages of principal sources of energy used in each region and converting to kWh/sqft and to therms/sqft. Canada regional emission factors for electricity (in kgCO2e/kWh) were provided by the carbon footprint database (last updated August 2018) and vary by Province

For each office, we multiplied the intensity factor with the square footage to obtain the total electricity and natural gas usage per year.

All Offices Located in the United Kingdom (UK)
To calculate our UK emissions we were supplied with an annual emissions report by Green Element.  The calculations completed by Green Element are in accordance with the GHG Protocol using 2017 conversions factors for purchased electricity and gas. Where up to 3 months’ worth of data was not available or accurate, the missing data were estimated using a monthly average for that supply.

Below are the combined calculated Scope 1 and 2 emissions:

Scope 1: 

  • 2017:  4,786.3 MTCO2e
  • 2018:  4,762.9 MTCO2e

Scope 2:

  • 2017:  29,546.8 MTCO2e
  • 2018:  27,781.9 MTCO2e

Below are our Electricity and Fuel usage (Natural Gas and Heating Oil)


  • 2017:  76,192.9 MWh
  • 2018:  72,689.6 MWh


Fuel (Natural Gas & Heating Oil)

  • 2017:  26,006.3 MWh
  • 2018:  25,865.4 MWh

Energy Intensity

These numbers include electricity, fuel (natural gas & heating oil), and central steam/heating where it was available, and use the number of full-time employees or square footage within our boundary as an intensity denominator.

Energy Per Employee:

  • 2017: 3.59 MWh per Employee
  • 2018: 3.46 MWh per Employee

Energy Per Square Foot:

  • 2017:  .0154 MWh per Sq Ft
  • 2018:  .0149 MWh per Sq Ft

GHG Emissions Intensity

These numbers include Scope 1 and Scope 2 emissions as detailed above in GHG Emissions numbers and use the number of full-time employees or square footage within our boundary as an intensity denominator.

GHG Emissions Per Employee

  • 2017:  1.17  MTCO2e per Employee
  • 2018:  1.11  MTCO2e per Employee

GHG Emissions Per Square Footage

  • 2017:  .0050 MTCO2e per Sq Ft
  • 2018:  .0048 MTCO2e per Sq Ft

GHG Emissions Target
IPG has a Scope 2 relative intensity target for a 10% reduction by 2030 in metric tons CO2e per employee from a baseline of 2015.