FuelEU Maritime · EU ETS shipping · IMO CII · EU MRV
Reconciled ±0.0000% vs EMSA 2023Provenship computes your fleet's 2026 obligations from your bunker delivery notes and voyage data. Methodology reconciled against EMSA's published 2023 emission report on 12,637 vessels — ±0.0000% delta.
Pre-GA. Methodology review by appointment. No public self-serve.
Engine reconciliation — 2026-06-26
€535,884,359
Aggregate projected 2026 FuelEU Maritime penalty across the EMSA 2023 public dataset.
Vessels reconciled
12,637
Fuel-bearing entries in EMSA’s published 2023 emission report.
Calc-only vs full-stack delta
±0.0000%
67/67 regulator-fixture tests passing.
Inputs
Bunker delivery notes + noon reports
Calculate + reconcile
Provenship engine
Outputs
Verifier-ready compliance report
From bunker delivery note to verifier-signed PDF. One reconciled engine across FuelEU, EU ETS, and IMO CII.
The engine in motion
Master sends the noon report in whatever format the bridge produces. Provenship ingests, structures, computes FuelEU + EU ETS + IMO DCS + CII contributions, and surfaces them in real time. At year-end, the verifier signs one pack.
What "reconciled" means
On 2026-06-26 the Provenship engine was run twice against the EMSA THETIS-MRV public 2023 dataset. The calculation-only path (ProofCli) computed €535,884,359 of aggregate 2026 FuelEU penalty across 12,637 fuel-bearing vessels. The full-stack path persisted every fuel and voyage row through the same Postgres-backed handlers production uses, then read each vessel back and recomputed from the rehydrated rows. The two paths agreed to ±0.0000%.
That is the bar this site is built around. Every number on the marketing pages comes from a single TypeScript constant (src/lib/reconciliation-data.ts) that is regenerated from the engine's proof run. There are no hand-typed totals.
Read the full reconciliation report →Capabilities
FuelEU Maritime, EU ETS shipping, and IMO CII share fuel data, voyage data, and the same reconciliation discipline. Each formula is anchored to a regulation citation and pinned by a regulator-derived fixture in the test suite.
GHG intensity computed per voyage from BDN-resolved fuel mix; compliance balance against the 2025-2029 target of 89.34 gCO2eq/MJ; pooling and banking modelled. Penalty €2,400 per tonne VLSFO-equivalent in deficit.
Reg. (EU) 2023/1805 Annex II + Annex IV
Scope CO2 from EU-relevant voyages × phase-in factor × EUA spot price. 40% in 2024, 70% in 2025, 100% from 2026. Surrender modelling and free-allocation handling.
Directive 2003/87/EC as amended by Directive (EU) 2023/959
Annual emission report shape per Annex II including verification status, EUA returned, and per-voyage attribution. Output reconciles to EMSA THETIS-MRV public publication.
Reg. (EU) 2015/757 Annex II (as amended)
Attained Carbon Intensity Indicator per vessel-year against the reference line and reduction factor. A-E rating output with three-year deteriorating-rating watchlist.
IMO Resolution MEPC.354(78)
Weighted GHG intensity across HFO, VLSFO, MGO, LNG, methanol, LPG and biofuel blends. Each fuel's Cf, LCV and well-to-wake emission factor pinned to the regulation table.
Reg. (EU) 2023/1805 Annex II Table 1; MEPC.1/Circ.866
Postgres row-level security with fail-closed TenantGuard transactions. Every read and write carries a tenant_id predicate enforced at the database, not at the application boundary.
Provenship ADR-003 (tenant isolation)
Pipeline
A single fleet run is a three-stage pipeline. Each stage is independently auditable, and the resulting PDF is reconcilable line-by-line to the underlying fuel and voyage entries.
Upload bunker delivery notes (PDF) and noon reports (CSV / EDI). Provenship extracts fuel type, quantity, sulphur content, well-to-wake emission factor, and persists each field with citation provenance from the source document.
The engine computes FuelEU Maritime GHG intensity vs target, EU ETS scope CO2 × phase-in × EUA spot, and IMO CII attained against the reference line. Every line of arithmetic is logged with the regulation article that grounds it.
Generate a verifier-ready emission report in the Reg. (EU) 2015/757 Annex II shape, plus machine-readable exports for fleet roll-up, pooling, and surrender accounting in your ERP.
Methodology preview
The engine was run two ways against the EMSA 2023 public dataset: a calculation-only path that operates directly on parsed CSV rows, and a full-stack path that persists every fuel and voyage row through TenantGuard transactions and reads back through the same handlers production uses. Both paths produced the same fleet-aggregate FuelEU penalty.
FuelEU compliance gauge — illustrative
Intensities in gCO2eq/MJ against the 2025 yearly limit (89.34 gCO2eq/MJ) from Reg. (EU) 2023/1805. Live gauge in the operator dashboard.
Reconciliation run — 2026-06-26
sextant-calc/1.0.0-SNAPSHOT
Calculation-only path
calculation-only ProofCli
Full-stack path
Dagger → handlers → DB (TenantGuard transactions)
Engine delta
Identical fleet aggregate to four decimal places
Vessels parsed
12,637 carried fuel data; 11,928 in 2026 deficit
Total runtime
53s ingest + 116s projection
Automated test suite
9 regulator-derived JSON fixtures pinning each formula
What Provenship does not do
Four capability boundaries we will not cross. Each one is a place a generic "maritime AI" platform would happily approximate; Provenship refuses because the cost of being wrong is real money or, in some cases, a safety event.
Provenship does not propose voyage plans, slow-steaming windows, or weather routing.
Why not
That is a maritime operations decision with safety and chartering constraints we cannot model. Use your voyage planner, weather routing, or operations platform.
Provenship does not source, price, or retire voluntary carbon credits.
Why not
FuelEU and EU ETS are compulsory regimes priced and surrendered in EUA. Voluntary offsets are not a substitute for either, and we will not blur that line.
Provenship does not quote bunker prices, recommend suppliers, or trigger purchases.
Why not
That is a commercial relationship between the operator and the supplier. We consume the bunker delivery note; we do not generate it.
Provenship does not manage crews, schedule maintenance, or sign charterparties.
Why not
Reference category: maritime operations + chartering platforms. Provenship is the calculation and reporting layer, not the operating system.
Methodology reconciled against
EMSA THETIS-MRV
75,587 vessel-years 2018-2023
Reg. (EU) 2023/1805
FuelEU Maritime
Reg. (EU) 2015/757
EU MRV
Directive 2003/87/EC
EU ETS
IMO MEPC.354(78)
CII rating
GLEC Framework v3.0
Cross-reference
ISO 14083:2023
Methodology
No customer logos, no fake testimonials. The trust signal is the public regulatory and methodology corpus the engine reconciles against. Independent verifier review is in progress; Provenship itself is not an accredited verifier.
Citation grounding
Provenship does not invent emission factors, target lines, or penalty rates. Each numeric input is pinned to its Official Journal reference or IMO resolution number, and tested against a regulator-derived JSON fixture in the build.
How citation grounding works →Sample formula provenance
HFO well-to-wake Cf
3.114 gCO2eq/g
Reg. (EU) 2023/1805 Annex II, Table 1 — Heavy fuel oil emission factor used in GHG intensity computation
FuelEU 2025-2029 target
89.34 gCO2eq/MJ
Reg. (EU) 2023/1805 Article 4(2) — −2% from 91.16 baseline; applies to all reporting years 2025 through 2029
FuelEU penalty rate
€2,400 / tVLSFOeq
Reg. (EU) 2023/1805 Annex IV — Per-tonne VLSFO-equivalent in compliance deficit, multiplied by deficit mass
EU ETS 2026 phase-in
100%
Directive 2003/87/EC Article 3gb — Full scope of in-scope CO2 from 2026; 40% (2024) and 70% (2025) precede
Field notes
Reconciliation against EMSA, the FuelEU penalty formula derived line by line, why GLEC and FuelEU disagree on LNG. Real numbers, real citations, no marketing fluff.
The same tonne of bunker fuel feeds FuelEU Maritime, EU ETS, IMO DCS and IMO CII — each with a different scope, boundary and emission factor. Reuse one number naively and at least one regime is wrong. Here is why, and the data design that fixes it.
Provenship's calculation engine reconciles to the exact euro against EMSA's published 2023 emission report across 12,637 vessels. Here is how the ±0.0000% delta was produced, and what was deliberately out of scope.
Annex IV Part B of Reg. (EU) 2023/1805 is short, but the chain from gCO2eq-per-MJ to euros runs through three conversions a sponsor often misses. Here is each step.
Methodology review
Send a one-line email and we will return the 25-page methodology review document — formula derivations, fixture sources, EMSA reconciliation appendix, and the engine version that produced each number. No NDA required for the review document itself.
Provenship is not an accredited verifier. The accredited verifier signs the emission report; Provenship produces the report and the audit trail behind it.