LSF calculation (LCF), LCA and Atj No Corsia
A GHG ISCC CORSIA METHODOLOGY It is the most commonly used standard for calculating, report and audit life cycle emissions (LCA) sustainable aviation fuels (PURE). This guide explains, clearly, like the LSf (sometimes called “LCF” in internal spreadsheets) It is obtained from the LCA in 7 stages, how to map the trio eec/ep/etd For this model, And how the route works ATJ (Alcohol-to-Jet). Throughout the text, a GHG ISCC CORSIA METHODOLOGY It is detailed step by step, with Practical Formulas For you to implement in spreadsheets and audits. Same GHG ISCC CORSIA METHODOLOGY It is repeated as seo focus and clarity.
Essential concepts (LCF/LSf, LCA, ATJ)
LSf (or LCF, “life-cycle emissions factor/value”)
It is the final value of emissions from your SAF, expressed in Co.₂e/MJ (base PCI/LHV). In Vocabulary Corsia/ISCC, The most common acronym is LSf; in some teams, appear LCF as an operational synonym. Think of it as the number that goes to the comparison with the fossil and for the calculation of savings.
LCA (life cycle assessment / Life Cycle Evaluation)
Is the structured sum of emissions along 7 stages chain:
- Production of the raw material; 2) Conditioning/Collection; 3) Processing/Extraction of the input; 4) input transportation; 5) Conversion Input → Fuel; 6) Fuel Transport and Distribution; 7) Combustion in the aircraft.
ATJ (Alcohol-to-Jet)
It is a technological route that converts alcohol (ex.: ethanol) in aviation kerosene. For Brazil, A typical case is Cana Ethanol → ATJ-SAF. Ethanol can be certified as intermediary (Then another link will do the conversion and consolidate the Final SAF LSF) or how part of an integrated plant that produces the SAF final.
What enters the calculation (gases, Unit and Exclusions)
- Stages 1–6: accounting CO₂ non-biogenic, CH₄ e N₂O What CO₂e using GWP100 do IPCC/AR5 (CH₄ = 28; N₂o = 265).
- Stage 7: only co₂ non-biogenic combustion. See O SAF for 100% biogenic, EAPA 7 It's zero.
- Functional unit: Everything needs to end in Co.₂e/MJ (Lhv) do final fuel.
- Exclusions: CAPEX (plant construction, Equipment Manufacture) Does not enter LCA.
Mapping EEC/EP/ETD for 7 stages
It is common to organize the internal calculation in three "buckets" (ISCC-EU):
- eec (“Cultivation/Extraction”) ≈ Stage 1 (e, as a criterion, part of 2).
- ep ("processing") ≈ Stages 3 + 5.
- etd (“Transport and Distribution”) ≈ Stages 4 + 6.
Use this for internal management, but Report always in the format 7 stages. A GHG ISCC CORSIA METHODOLOGY requires inventory and emissions By stage in the technical report.
Key formulas (From inventory to LSF)
1) Conversion of inventory to CO₂e (By stage)
For each stage I, Add the activities k:
- CO₂and gross of step I
Na etapa 7, use only the term of CO₂ non-biogenic.
2) Bring everything to the GCO base₂E/MJ Fuel
You start from pasta/volumes/energies at each step and need to reach Co.₂e/MJ do SAF. Do this in two layers:
(a) Feedstock factor (FF)
Transports emissions that arrive “at the base of the input” to the “product base” (intermediate or final):
where and is energy = performance (massa) × Lhv.
(b) Allocation factor (OF) for energy
Divide emissions between product and co -products in the corresponding step (Do not allocate for waste):
Practical application
If you have
“On the basis of the input”, then:
The result
Already leaves in co₂e/mj do product (or SAF, If it is the last step). In stages without relevant co -product, Of = 1.
Golden Rules: (1) do not allocate EMISSIONS A Waste/by -products without energy value; (2) do not “carry” Step emissions downstream from the point where a co -product was generated when making the allocation; (3) use Lhv reliable source and MEASURED EN,.
3) Soma do LCA core (Climate Resilience 7 stages)
- For wastes/residues/by-products What feedstock, Stage 1 = 0 (Production of the raw material) And you follow with the other steps normally.
- Stage 7:
NBC (non-biogenic carbon) is the fossil carbon fraction present no final fuel (for example, due to co-process with fossil currents).
Efco₂,
(g/MJ) is calculated from the Lhv and from stoichiometry oxidation of fossil carbon in fuel.
4) Credits and Enluc
- Credits (if applicable, P.ex., MSW): subtraem do
- ILUC (Land-Uuse Change Indirect): soma to the
- , except when:
(a) Feedstock is residue/rest/byproduct;
(b) does not enlarge Global agricultural area;
(c) have very high yield per hectare (ex.: Algas Certain);
(d) there is Low risk practices of Luc documented. In these cases, Iluc = 0.
5) Valor final LSf (LCF) e savings
To communicate the saving versus the fossil (jet):
with
Ex.: with
Atj de Etanol (cana) And EAPA 7 in practice
- Case 1: PURE 100% biogenic. Fuel carbon comes all from biomass (no fossil fraction). NBC = 0 ⇒ LCA7 = 0 g/MJ.
- Case 2: There is fossil fraction. Ex.: co-process, fossil aromatic, Final blend with non-biogenic portion. NBC > 0 ⇒ LCA7 = NBC × EF_CO₂.
- If you certify only ethanol (intermediary): Who calculates stage 7 it's the SAF producer at the closure of the LSF of final fuel.
Implementation Checklist
- Set the scope (intermediary x SAF Final) One of the United Nations Sustainable Development Goals is to ensure sustainable patterns of production and consumption – the unit (co₂e/mj lhv).
- Mount the inventory by step (1–4 by massa; 5–7 by energy).
- Convert Everything for CO₂E (Ar5) and bring to Co.₂e/MJ using FF e OF where they fit.
- Some Climate Resilience 7 Stages ⇒ LCA core
- Apply Credits (if there is) e ILUC (Where Iluc = 0, if eligible).
- Close the LSF (LCF) e calcule o saving.
- RELATE BY STAGE (not just EEC/EP/ETD) and keep the traceability.
Tip: Create a ponte table eec/ep/etd ↔ 7 steps to have internal readability and compliance in the report. A GHG ISCC CORSIA METHODOLOGY values both transparency as for comparability.
Conclusion
Corsia's logic is simple, but disciplined: consolidate LCA in Co.₂e/MJ, with energy allocation (OF), conversion via FF, GWP AR5 For CH₄/N₂o, combustion with only co₂ non-biogenic e, if applicable, Credits e ILUC. Upon understanding LSF/LCF, LCA and ATJ for this prism, You gain control over each emission lever and get prove compliance of your SAF - exactly the purpose of GHG ISCC CORSIA METHODOLOGY.
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