Scope 1 Emissions:
A Quick Insight
Scope 1 emissions are the greenhouse gases a company releases directly from sources it owns or controls. They form the foundation of any corporate carbon inventory and are the part of the footprint a firm can influence most immediately.
What counts as Scope 1
Scope 1 covers four categories:
1 : Stationary combustion — fuels burned on‑site for heat, steam, or power (e.g., natural gas boilers, diesel generators).
2 : Mobile combustion — company‑owned vehicles, plant, and machinery (vans, trucks, forklifts, aircraft).
3 : Process emissions — gases released by industrial chemical or physical processes (cement, steel, nitric acid, etc.).
4 : Fugitive emissions — unintentional leaks of gases such as methane (pipelines), refrigerants (HFCs), or SF₆ from electrical switchgear.
All seven Kyoto gases (the seven greenhouse gases designated in the 1997 Kyoto Protocol) are included: CO₂, CH₄, N₂O, HFCs, PFCs, SF₆, NF₃.
Why Scope 1 matters
It is the most controllable part of a company’s footprint. It is usually the most accurate data because it comes from owned operations.
Regulators and investors treat Scope 1 as a baseline indicator of operational discipline.
For energy companies, Scope 1 often reveals the real operational emissions, separate from purchased electricity or wider value‑chain impacts.
How Scope 1 is measured
The standard formula is:
Emissions (tCO₂e) = Activity data – Emission factor
Examples of activity data: litres of diesel cubic metres of natural gas kilograms of refrigerant added tonnes of clinker produced
Emission factors come from national inventories (EPA, DEFRA, IEA, etc.).
Common pitfalls
a Under‑reporting refrigerant leakage — often the largest hidden Scope 1 source. b Misclassifying vehicle emissions (owned = Scope 1; employee‑owned = Scope 3). c Using outdated emission factors. d Ignoring small but high‑impact gases (SF₆ in grid equipment).