Oil tanker · Norway flag · built 2005

HEATHER KNUTSEN: CO₂ emissions 2018–2025

IMO 9273064 EU ETS8 reporting years

CO₂ reported 2025: 11,401 t
Fuel burned: 3,564 t
Distance: 14,353 nm
Time at sea: 1,765 h
Emitted at berth: 7% of total
Share of year under way: 20%
Gross tonnage: 80,918

HEATHER KNUTSEN against its type

Built in 2005, it is 5 years older than the median oil tanker on this register, which was built in 2010 (2,896 vessels with a known build year). At 80,918 gross tonnage it is larger than 71% of the other 2,841 oil tankers with a recorded tonnage. It is one of 58 oil tankers here under the Norway flag, 1.6% of the 3,548 on the register. The same builder is recorded for 563 other vessels here, 217 of them oil tankers. Knutsen O.A.S. Shipping AS is linked to 4 vessels on this register. The returns for 2018–2025 all give Haugesund as port of registry.

Its 11,401 t of CO₂ for 2025 is 44% above the median of 7,922 t among the 1,704 oil tankers on this register that reported for 2025. Per nautical mile it emitted 794.3 kg CO₂, 2.0 times the type median of 403.2 kg. It logged 1,765 hours at sea against a median of 2,030 hours for its type that year. 6.9% of its 2025 emissions were at berth; the median for oil tankers was 7.8%. Across 8 years with reported emissions, the highest was 2019 (36,258 t) and the lowest 2025 (11,401 t). Its efficiency percentile within the type went from 86 in 2018 to 99 in 2025 (lower is more efficient).

Emissions by year2018–2025

Year	CO₂ (t)	Fuel (t)	Distance (nm)	At sea (h)	At berth (t)	kg CO₂/nm	EEOI	Percentile
2025	11,401	3,564	14,353	1,765	788	794.3	40.3	99
2024	18,029	5,623	19,778	2,780	2,093	911.5	23.6	95
2023	22,010	6,865	25,864	3,450	3,181	851.0	17.8	89
2022	27,015	8,426	27,078	3,942	3,228	997.7	23.7	94
2021	28,732	8,962	28,446	5,410	1,852	1,010.0	39.3	98
2020	19,248	6,004	18,955	3,084	2,861	1,015.4	37.7	98
2019	36,258	11,310	33,828	7,721	4,966	1,071.8	22.5	92
2018	27,977	8,726	23,551	6,126	2,564	1,187.9	17.1	86

Vessel particulars

IMO number: 9273064
Ship type: Oil tanker
Gross tonnage: 80,918
Length overall: 277.0 m
Year built: 2005
Flag state: Norway per EU MRV 2025
Builder: Samsung Heavy Industries
Port of registry: Haugesund MRV 2025
Technical efficiency (design): EEXI (2.91 gCO₂/t·nm)
Operator: Knutsen O.A.S. Shipping AS
Verifier: DNV, Germany
Accreditation: VS-16026-01
Compliance document issued: 2026-03-27
Compliance document expires: 2027-06-30

Efficiency against its own type2025

Position 1,439 of 1,448 qualifying oil tankers by EEOI, at the 99th percentile. The dashed line is the type median, 7.5; this vessel reported 40.3.

EEOI divides emissions by transport work, which for this vessel and year was 282,970,712 tonne-miles over 14,353 nautical miles.

Reported CO₂ by year

Reported CO₂ in 2025 was 59.2% lower than in 2018, for EU/EEA voyages only.

From 2024 to 2025, emissions fell 36.8% while distance sailed fell 27.4%and CO₂ per nautical mile fell 12.9%.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: 11,576 t
Methane (CH₄): 0.18 t
Nitrous oxide (N₂O): 0.64 t
Under EU ETS: 6,606 t, 58% of total

Sources and how to read this

Emissions: EU MRV publication (THETIS-MRV), reporting years 2018–2025, published by the European Commission.
Vessel particulars: Wikidata (CC0) and Wikimedia Commons.

This page draws on 8 MRV reporting years, an efficiency ranking, 5 of 5 vessel particulars and a licensed photograph. Not found in the sources for this vessel: AIS movements in Norwegian waters, a name history, 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.