How we report greenhouse gases
We strive to measure, manage and reduce our direct and indirect greenhouse gas emissions. We report according to the Greenhouse Gas Protocol and our Scope 1 and Scope 2 carbon emission inventory is third party assured.
Greenhouse gas reporting
Skanska’s greenhouse gas reporting covers all Business Units. We measure carbon emissions in accordance with the Greenhouse Gas Protocol and apply the financial control approach. The base year for reporting is 2009. Activity data is based on invoiced data, models using invoiced data, real-time meters or data as reported by suppliers. Energy conversion is done using publically available conversion factors and emission factors from open databases like International Energy Agency (IEA), UK Department for Business, Energy & Industrial Strategy, and Reliable Disclosure Systems for Europe (RE-DISS) are applied. Greenhouse gases included in the reported carbon inventory are carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O). Hydrofluorocarbons (HFCs), perfluorocarbons (PFCs) and sulphur hexafluoride (SF6) are not applicable based on Skanska’s operations and current scope of reporting.
Emissions data is subject to inherent uncertainties due to incomplete scientific knowledge used to determine emission factors and resulting effects on measurements and estimations. A limited assurance engagement of the Skanska Scope 1 and Scope 2 carbon emission inventory is undertaken by EY.
Carbon emissions from our operations
Direct (scope 1) and indirect (scope 2) emissions
expressed in tonnes carbon dioxide equivalent (CO2e)
|Scope 1||275 537||312 800||330 758||367 791||386 154|
|Scope 2||Location-based method||55 464||52 704||49 207||60 494||51 305|
|Market-based method||71 389||73 300|
In 2017 biodiesel with 100% HVO (Hydrogenated Vegetable Oil) represented a total of 393 tonnes of CO2.
Direct emissions (Scope 1)
Emission factors used for Skanska’s scope 1 emissions are derived from UK Department for Business, Energy & Industrial Strategy greenhouse gas conversion factors for company reporting, UK Department for Environment, Food & Rural Affairs (Defra) - 2016 version 1.02 and from Greenhouse Gas Protocol V1.3. The Global Warming Potential (GWPs) used in the calculation of CO2e are based on the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) over a 100-year period.
Energy indirect emissions (Scope 2)
Skanska’s scope 2 emissions are calculated and presented in accordance with the Greenhouse Gas Protocol Scope 2 Guidance, applying both the location-based and market-based methods. Emission factors used for the location-based approach are derived from International Energy Agency (IEA, 2014) using the IPCC AR4 as well as bespoke global warming potential rates.
Supplier-specific emission factors of zero are used for the market-based approach for Sweden, Finland and the UK to reflect the use of renewable electricity. For remaining European countries, residual mix emission factors are used sourced from the Reliable Disclosure System for Europe (RE-DISS, 2014) using the IPCC AR4 GWP rates. The Business Units located in the US use IEA 2014.
Indirect emissions from value chain activities (Scope 3)
Scope 3 is an optional reporting category for other indirect emissions that are a consequence of Skanska’s activities, but occur from sources not owned or controlled by us. These emissions includes for example the extraction and production of purchased materials and business travels.