STI ONYX: CO₂ emissions 2019–2025

STI ONYX against its type

Built in 2012, it is 2 years newer than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 29,725 gross tonnage it is smaller than 75% of the other 2,841 oil tankers with a recorded tonnage. It is one of 289 oil tankers here under the Malta flag, 8.1% of the 3,548 on the register. The same builder is recorded for 983 other vessels here, 270 of them oil tankers. Its MRV returns name it STI ONYX for 2019–2023 and MRC LIVA for 2024–2025. The reported port of registry changed: Majuro (2019–2023), then Valletta (2024–2025).

Its 8,319 t of CO₂ for 2025 is close to the median of 7,922 t among the 1,704 oil tankers on this register that reported for 2025. Per nautical mile it emitted 291.7 kg CO₂, 28% below the type median of 403.2 kg. It logged 2,809 hours at sea against a median of 2,030 hours for its type that year. 5.8% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 6 years with reported emissions, the highest was 2024 (11,971 t) and the lowest 2021 (5,871 t). Its efficiency percentile within the type went from 53 in 2019 to 69 in 2025 (lower is more efficient). Of the 6 sister ships listed below with a 2025 return, 5 reported a lower CO₂ per nautical mile than this vessel.

Emissions by year2019–2025

Vessel particulars

IMO number

9629964

Previously reported as

MRC LIVA

Ship type

Oil tanker

Gross tonnage

29,725

Length overall

183.0 m

Beam

32.0 m

Year built

2012

Flag state

Malta per EU MRV 2025
Sources disagree: Wikidata/AIS (undated) list Marshall Islands. The flag shown is from the newest official source, the EU MRV return for 2025.

Builder

HD Hyundai Mipo

Port of registry

Valletta MRV 2025

Home port

Valetta

Technical efficiency (design)

EEXI (4.83 gCO₂/t·nm)

Verifier

Polish Register of Shipping, Poland

Accreditation

PL-VG-0013

Compliance document issued

2026-02-11

Compliance document expires

2027-06-30

Efficiency against its own type2025

Position 996 of 1,448 qualifying oil tankers by EEOI, at the 69th percentile. The dashed line is the type median, 7.5; this vessel reported 9.4.

EEOI divides emissions by transport work, which for this vessel and year was 884,980,851 tonne-miles over 28,516 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 21.3% higher than in 2019, for EU/EEA voyages only. No return is recorded for 2022, so the series has gaps.

From 2024 to 2025, emissions fell 30.5% while distance sailed fell 33.9%and CO₂ per nautical mile rose 5.2%.That points mainly to how much the vessel sailed, rather than the other.

Where the 2025 emissions occurred

Methane, nitrous oxide and EU ETS2025

Total CO₂ equivalent

8,449 t

Methane (CH₄)

0.13 t

Nitrous oxide (N₂O)

0.48 t

Under EU ETS

4,637 t, 56% of total

Verifier history

A change of verifier is not in itself a sign of anything being wrong.

Sources and how to read this

• Emissions: EU MRV publication (THETIS-MRV), reporting years 2019–2025, published by the European Commission.
• Vessel particulars: Wikidata (CC0).

This page draws on 6 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and a name history. Not found in the sources for this vessel: AIS movements in Norwegian waters, a licensed photograph, a sanctions listing and US port state inspections.

Empty means unreported, never zero. How EEOI, distance, percentiles and sister ships are handled is explained under reading a vessel page. Something wrong? See corrections.

Comparable vesselssister ships and nearest by tonnage

• SCF PACIFICA sister · 2011 · · 5,697 t · 426.7 kg/nm
• STI BERYL sister · 2013 · · 2,260 t · 295.3 kg/nm
• IVER BALANCE sister · 2011 · 5,948 GT · 5,796 t · 146.7 kg/nm
• IVER BEAUTY sister · 2011 · 5,948 GT · 6,275 t · 125.7 kg/nm
• IVER BEST sister · 2011 · 5,948 GT · 6,260 t · 150.7 kg/nm
• IVER BLESSING sister · 2011 · 5,948 GT · 5,266 t · 134.2 kg/nm
• THE BLACKSMITH sister · 2013 · 23,009 GT · 8,010 t · 286.6 kg/nm
• THE DIPLOMAT sister · 2014 · 23,009 GT · 3,377 t · 246.4 kg/nm