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 |
|---|---|---|---|---|---|
| 2101 |
STAR VANCOUVER
IMO 9855850
|
63,614 | 2020 |
5.0
|
C |
| 2102 |
ULTRA FOREST
IMO 9873888
|
40,261 | 2020 |
5.0
|
C |
| 2103 |
FREE STATE
IMO 9386392
|
58,679 | 2008 |
5.0
|
C |
| 2104 |
EVOLUTION
IMO 9122899
|
24,306 | 1995 |
5.0
|
C |
| 2105 |
JNS OCEAN
IMO 1044508
|
40,495 | 2024 |
5.0
|
C |
| 2106 |
WHITEWING
IMO 9943231
|
37,370 | 2022 |
5.0
|
C |
| 2107 |
BELGUARDIAN
IMO 9911654
|
61,070 | 2021 |
5.0
|
C |
| 2108 |
MANDARIN CHINA
IMO 9569243
|
56,778 | 2011 |
5.0
|
C |
| 2109 |
C LION
IMO 9425916
|
58,117 | 2010 |
5.0
|
C |
| 2110 |
RINIA
IMO 9594406
|
56,746 | 2012 |
5.0
|
C |
| 2111 |
SEA CREDENCE
IMO 9479010
|
55,640 | 2010 |
5.0
|
C |
| 2112 |
BC MIRABEL
IMO 9531662
|
58,186 | 2013 |
5.0
|
C |
| 2113 |
SJ BUSAN
IMO 9418729
|
55,940 | 2008 |
5.0
|
C |
| 2114 |
BERNINA
IMO 9423580
|
58,682 | 2011 |
5.0
|
C |
| 2115 |
PEGASUS
IMO 9755842
|
34,958 | 2018 |
5.0
|
C |
| 2116 |
OCEAN CROWN
IMO 9866653
|
37,870 | 2020 |
5.0
|
C |
| 2117 |
KACEY
IMO 9420277
|
55,522 | 2009 |
5.0
|
C |
| 2118 |
CHRYSANTHI S
IMO 9527441
|
80,269 | 2012 |
5.0
|
C |
| 2119 |
ST. ANDREW
IMO 9401934
|
50,779 | 2010 |
5.0
|
C |
| 2120 |
BRITAIN BAY
IMO 9615729
|
58,709 | 2012 |
5.0
|
C |
| 2121 |
ROSTRUM SOLAR
IMO 9941623
|
40,071 | 2024 |
5.0
|
C |
| 2122 |
FEDERAL DART
IMO 9805245
|
34,492 | 2018 |
5.0
|
C |
| 2123 |
STELIOS B
IMO 9452490
|
58,608 | 2010 |
5.0
|
C |
| 2124 |
WHITE FIN
IMO 9607291
|
56,780 | 2011 |
5.0
|
D |
| 2125 |
GREEN GEM
IMO 9831517
|
38,503 | 2018 |
5.0
|
D |
| 2126 |
BELATLANTIC
IMO 9744104
|
63,318 | 2016 |
5.0
|
D |
| 2127 |
PANAGIOTIS
IMO 9461063
|
80,717 | 2007 |
5.0
|
D |
| 2128 |
DENSA EAGLE
IMO 9432488
|
55,089 | 2006 |
5.0
|
D |
| 2129 |
DE XIN SHENG XIANG
IMO 9561992
|
57,045 | 2011 |
5.0
|
D |
| 2130 |
MEDI CABOTO
IMO 9806770
|
61,123 | 2017 |
5.0
|
D |
| 2131 |
BARILOCHE
IMO 9725885
|
43,457 | 2016 |
5.0
|
D |
| 2132 |
VENTURE
IMO 9714721
|
61,272 | 2016 |
5.0
|
D |
| 2133 |
SEASHIN
IMO 9230763
|
52,428 | 2001 |
5.0
|
D |
| 2134 |
ARAUCARIA
IMO 9882994
|
38,026 | 2020 |
5.0
|
D |
| 2135 |
HOPE 1
IMO 9514339
|
56,174 | 2012 |
5.0
|
D |
| 2136 |
ROSTRUM AFRICA
IMO 9910363
|
40,010 | 2022 |
5.1
|
D |
| 2137 |
POYANG
IMO 9721580
|
39,790 | 2016 |
5.1
|
D |
| 2138 |
YI CHUN 15
IMO 9631474
|
56,735 | 2012 |
5.1
|
D |
| 2139 |
AGGELIKI B
IMO 9456238
|
56,770 | 2011 |
5.1
|
D |
| 2140 |
XIN AN NING
IMO 9407859
|
55,256 | 2009 |
5.1
|
D |
| 2141 |
PAN SPIRIT
IMO 9487433
|
56,891 | 2011 |
5.1
|
D |
| 2142 |
SE NICKY
IMO 9839088
|
37,717 | 2018 |
5.1
|
D |
| 2143 |
KOM
IMO 9905708
|
32,162 | 2021 |
5.1
|
D |
| 2144 |
KMARIN OSLO
IMO 9726516
|
63,098 | 2015 |
5.1
|
D |
| 2145 |
THE RULER
IMO 9336608
|
75,356 | 2007 |
5.1
|
D |
| 2146 |
FEDERAL OHIO
IMO 9975399
|
34,763 | 2024 |
5.1
|
D |
| 2147 |
TROODOS OAK
IMO 9875135
|
85,439 | 2020 |
5.1
|
D |
| 2148 |
DOGAN
IMO 9625475
|
38,691 | 2013 |
5.1
|
D |
| 2149 |
TURICUM
IMO 9583110
|
58,097 | 2012 |
5.1
|
D |
| 2150 |
FEDERAL MICHIGAN
IMO 9975416
|
34,763 | 2024 |
5.1
|
D |
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.