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 2024. Lower is greener. Pick a segment and size class to see the greenest vessels first.
| # | Vessel | Size (DWT) | Built | Carbon intensity — AER (g CO₂/dwt·nm) | Grade |
|---|---|---|---|---|---|
| 2051 |
CSL SPIRIT
IMO 9138111
|
70,018 | 2001 |
5.0
|
C |
| 2052 |
GENCO PYRENEES
IMO 9511832
|
58,018 | 2010 |
5.0
|
C |
| 2053 |
VELVET
IMO 9782651
|
37,324 | 2021 |
5.0
|
C |
| 2054 |
MED ISLAND
IMO 9322748
|
28,556 | 2005 |
5.0
|
C |
| 2055 |
OREGON HARMONY
IMO 9836907
|
38,442 | 2019 |
5.0
|
C |
| 2056 |
VEGA
IMO 9456537
|
55,733 | 2011 |
5.0
|
C |
| 2057 |
SHENG MAO HAI
IMO 9533086
|
56,901 | 2011 |
5.0
|
C |
| 2058 |
VISION I
IMO 9169330
|
46,693 | 1999 |
5.0
|
C |
| 2059 |
MYRA BAY
IMO 9626986
|
56,546 | 2014 |
5.0
|
C |
| 2060 |
WESTERN DONCASTER
IMO 9831505
|
39,461 | 2019 |
5.0
|
C |
| 2061 |
OAK BAY
IMO 9652557
|
55,845 | 2013 |
5.0
|
C |
| 2062 |
DONALD M. JAMES
IMO 9770555
|
66,454 | 2018 |
5.0
|
C |
| 2063 |
SPAR VEGA
IMO 9490870
|
57,970 | 2011 |
5.0
|
C |
| 2064 |
RUEN
IMO 9754903
|
45,010 | 2016 |
5.0
|
C |
| 2065 |
BUNUN TREASURE
IMO 9894715
|
37,875 | 2022 |
5.0
|
C |
| 2066 |
XIN HAI TONG 8
IMO 9741566
|
48,897 | 2014 |
5.0
|
C |
| 2067 |
W-LION
IMO 9663104
|
59,999 | 2014 |
5.0
|
C |
| 2068 |
ASTURA
IMO 9994838
|
39,902 | 2024 |
5.0
|
C |
| 2069 |
HUA SI HAI
IMO 9626895
|
56,568 | 2012 |
5.0
|
C |
| 2070 |
WARISA NAREE
IMO 9343417
|
53,840 | 2010 |
5.0
|
C |
| 2071 |
COLUMBIA RIVER
IMO 9331907
|
55,922 | 2006 |
5.0
|
C |
| 2072 |
NEW LIULINHAI
IMO 9285108
|
55,676 | 2004 |
5.0
|
C |
| 2073 |
BERGE RISHIRI
IMO 9713222
|
35,172 | 2017 |
5.0
|
C |
| 2074 |
PANAMAX NOSTOS
IMO 9325051
|
76,620 | 2005 |
5.0
|
C |
| 2075 |
TRAMMO INDEPENDENT
IMO 9762895
|
38,800 | 2016 |
5.0
|
C |
| 2076 |
SHENG DE HAI
IMO 9663178
|
56,721 | 2013 |
5.0
|
C |
| 2077 |
ANNELIESE
IMO 1015325
|
40,398 | 2024 |
5.0
|
C |
| 2078 |
LAGO DI NEMI
IMO 9303869
|
45,511 | 2006 |
5.0
|
C |
| 2079 |
YASA OSAKA
IMO 9948279
|
37,403 | 2023 |
5.0
|
C |
| 2080 |
WESTERN STABAEK
IMO 9989273
|
40,553 | 2024 |
5.0
|
C |
| 2081 |
ARMIA KRAJOWA
IMO 9708033
|
39,092 | 2013 |
5.0
|
C |
| 2082 |
MERGANSER
IMO 9959084
|
39,971 | 2023 |
5.0
|
C |
| 2083 |
UNI HARMONY
IMO 9775165
|
37,655 | 2016 |
5.0
|
C |
| 2084 |
SEA PEARL
IMO 9478896
|
55,589 | 2009 |
5.0
|
C |
| 2085 |
BULK VALOR
IMO 9520675
|
58,105 | 2013 |
5.0
|
C |
| 2086 |
CHIOS SUNRISE
IMO 9639907
|
56,589 | 2013 |
5.0
|
C |
| 2087 |
INCE EGE
IMO 9436733
|
57,373 | 2010 |
5.0
|
C |
| 2088 |
YASA ILHAN
IMO 9396218
|
55,526 | 2007 |
5.0
|
C |
| 2089 |
PARIS TRADER
IMO 9945514
|
40,292 | 2023 |
5.0
|
C |
| 2090 |
GULMAR
IMO 9146962
|
45,719 | 1997 |
5.0
|
C |
| 2091 |
XIN AN YUAN
IMO 9407873
|
55,277 | 2009 |
5.0
|
C |
| 2092 |
UNI HORIZON
IMO 9811517
|
36,861 | 2018 |
5.0
|
C |
| 2093 |
ROSTRUM EUROPE
IMO 9910105
|
40,003 | 2021 |
5.0
|
C |
| 2094 |
HAI JIN JIANG SH
IMO 9579729
|
55,000 | 2010 |
5.0
|
C |
| 2095 |
BOLTEN SINGAPORE
IMO 9737357
|
63,083 | 2015 |
5.0
|
C |
| 2096 |
AMFITRITI
IMO 9463592
|
58,814 | 2010 |
5.0
|
C |
| 2097 |
RIVA
IMO 9693331
|
40,013 | 2016 |
5.0
|
C |
| 2098 |
BODRUM-M
IMO 9425784
|
58,126 | 2010 |
5.0
|
C |
| 2099 |
LIBERTANGO
IMO 9722003
|
63,679 | 2017 |
5.0
|
C |
| 2100 |
STAR VANCOUVER
IMO 9855850
|
63,614 | 2020 |
5.0
|
C |
Which engines power the greenest fleets?
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 2024 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.
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.