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Most Emission-Efficient Bulk Carriers

Ships ranked by AER (Annual Efficiency Ratio) — grams of CO₂ emitted per tonne of deadweight carried one nautical mile (g CO₂/dwt·nm), the IMO carbon-intensity metric behind the CII rating — from official EU MRV emissions data for reporting year 2025. Lower is greener. Pick a segment and size class to see the greenest vessels first.

Segment rank (2025)
#2,967 of 3,436 bulk carriers
CO₂ intensity
6.5 g CO₂/dwt·nm
vs segment average (4.71)
+37% higher
E
Bulk Carrier Container Ship Oil Tanker Chemical Tanker Gas Carrier LNG Carrier General Cargo Vehicle Carrier Refrigerated Cargo Ro-Ro Cargo
Sort 🌱 Greenest first 🔧 Least efficient first — retrofit candidates
Size (DWT)
All sizes < 25,000 DWT 25k – 60k DWT 60k – 100k DWT 100k – 200k DWT > 200,000 DWT
Year
2025 2024
3,507
vessels ranked
1.74
greenest (g CO₂/t·nm)
4.46
segment median
# Vessel Size (DWT) Built Carbon intensity — AER (g CO₂/dwt·nm) Grade
2951 STRADION
IMO 9522922
 36,868 2011
6.4
E
2952 PRAETORIUS
IMO 9470856
 28,345 2008
6.4
E
2953 LADY MARIS
IMO 9228071
 45,601 2001
6.4
E
2954 ELONG ELONG
IMO 9548732
 21,460 2009
6.4
E
2955 GOLDEN NOUR
IMO 9497440
 31,780 2011
6.4
E
2956 ATROMITOS L
IMO 9605073
 28,227 2012
6.4
E
2957 ASTURCON
IMO 9646730
 36,070 2011
6.4
E
2958 SHENG XIANG HAI
IMO 9533062
 56,936 2010
6.4
E
2959 AZTECA
IMO 9646742
 36,054 2014
6.4
E
2960 CAPE BYRON
IMO 9629677
 36,005 2012
6.4
E
2961 NESTOR S
IMO 9473341
 75,200 2011
6.4
E
2962 FEDERAL SUTTON
IMO 9595917
 37,168 2012
6.5
E
2963 STELLAR TRADER
IMO 9628817
 35,946 2013
6.5
E
2964 PHATRA NAREE
IMO 9649861
 35,882 2017
6.5
E
2965 LOLWA SH
IMO 9117832
 27,359 1996
6.5
E
2966 ZAFER
IMO 9579315
 37,768 2011
6.5
E
2967 PATAGONIA
IMO 9611280
 35,964 2012
6.5
E
2968 BAHAMA SPIRIT
IMO 9083263
 44,389 1995
6.5
E
2969 SUPER SARKAS
IMO 9221633
 28,495 2002
6.5
E
2970 ARXAGELOS
IMO 9445124
 28,534 2007
6.5
E
2971 YANGTZE GRACE
IMO 9584231
 32,503 2012
6.5
E
2972 AMK NOBLE
IMO 9557238
 32,449 2010
6.5
E
2973 SOUTHERN CROSS
IMO 9606027
 37,085 2014
6.5
E
2974 AM PURPOSE
IMO 9455387
 35,196 2006
6.5
E
2975 APOGEE ENDEAVOUR
IMO 9553141
 28,341 2009
6.5
E
2976 MARGUERITA
IMO 9717515
 27,674 2016
6.5
E
2977 NEGMAR MEKO
IMO 9625451
 35,138 2013
6.5
E
2978 SIDRIAN
IMO 9285134
 38,981 2005
6.5
E
2979 PERA
IMO 9633202
 38,218 2012
6.5
E
2980 SELO
IMO 9543251
 32,389 2011
6.5
E
2981 POAVOSA WISDOM VI
IMO 9589724
 28,213 2011
6.5
E
2982 SEA DESTINY
IMO 9454175
 55,614 2009
6.5
E
2983 ANGY R
IMO 9530955
 36,903 2011
6.5
E
2984 MALTEZA
IMO 9479034
 55,580 2011
6.5
E
2985 NEW SOUL
IMO 9325154
 29,818 2008
6.5
E
2986 MACCOA
IMO 9413913
 30,898 2009
6.5
E
2987 ARIZONA
IMO 9592733
 56,969 2010
6.5
E
2988 THALIS
IMO 9616747
 37,189 2012
6.5
E
2989 KHOI VENTURES
IMO 9633288
 28,207 2012
6.5
E
2990 NAB BULKER
IMO 9270907
 32,729 2003
6.5
E
2991 LI DA SHUN
IMO 9546095
 56,897 2010
6.5
E
2992 PORTAITISSA
IMO 9486582
 37,149 2011
6.5
E
2993 ALENTEJO
IMO 9626118
 36,041 2013
6.5
E
2994 AMALIYA
IMO 9312341
 28,436 2004
6.5
E
2995 SMEW
IMO 9688843
 35,998 2014
6.5
E
2996 SYROS TRADER
IMO 9395214
 43,100 2008
6.5
E
2997 LIPSI
IMO 9522958
 35,066 2011
6.5
E
2998 AZURE
IMO 9432256
 57,000 2012
6.5
E
2999 ASTRO ORION
IMO 9767326
 37,347 2017
6.6
E
3000 MAPLE AMBITION
IMO 9760354
 35,513 2015
6.6
E
Page 60 of 69 — 3,436 vessels
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Engine intelligence

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The main engine is the single largest CO₂ source on board — typically well over 80% of a ship's emissions come from propulsion. We aggregated this ranking the other way around: every engine design is scored by the measured carbon intensity of the vessels carrying it, licensee-built units merged under their design brand. The verdict from the 2025 data — modern dual-fuel designs like MAN B&W's ME-GI and WinGD's X-DF families, together with EGR/SCR-abated and ultra-long-stroke G-type engines, consistently power the most emission-friendly ships in service.

Emission-friendly engine ranking

AER (Annual Efficiency Ratio) = annual CO₂ emissions ÷ (deadweight × distance sailed), the IMO carbon-intensity metric used for CII ratings. It is built only from measured CO₂, distance and deadweight — not the self-reported cargo transport-work figure, which is unreliable. Implausible outliers (top 2% per segment) are excluded. Grade A–E reflects each vessel's rank within its segment. Source: EMSA THETIS-MRV.