Navalyze · Ro-pax · Ship

ISLE OF INNISFREE

IMO: 8908466
Type: Ro-pax ship
Flag (estimated): Cyprus
Port of registry: Limassol
Technical efficiency: EEXI 30.76 g CO₂/t·nm
Former names: CALAIS SEAWAYS

ISM company (DoC holder) in 2025: Matrix Ship Management LTD

Report year

2021 at a glance

From the 2021 THETIS-MRV report.

Fuel kg/nm

136

Ro-pax median 155 kg/nm (−12%)

CO₂ per transport work (pax)

31.5

g CO₂/pax·nm · Ro-pax median 815 (−96%)

CO₂ per transport work (freight)

377

g CO₂/t·nm · Ro-pax median 226 (+67%)

Average speed

14.0 kn

Ro-pax median 16.2 kn (−14%)

Fuel per day at sea

45.7 t/day

Fuel consumed

6,316 t

CO₂ emitted

19,838 t

Distance sailed

46,465 nm

CO₂ ÷ CO₂ per mile

Time at sea

3,319 h

138 days, 38% of the year

Within the ro-pax fleet, 2025

Set against all 408 ro-pax ships with a full-year 2025 report. Bigger ships burn more per mile but less per tonne of cargo, so read fuel per mile with the ship's size in mind.

Fuel kg/nmThis ship 184 kg/nm · median 150 (+22%)

69.3Ranks 304 of 408, lowest first232

Average speedThis ship 15.5 kn · median 15.8 (−2%)

12.0Faster than 45% of ro-pax ships22.3

CO₂ per transport work (pax)This ship 532 g CO₂/pax·nm · median 567 (−6%)

66.8Ranks 195 of 408, lowest first1,569

CO₂ per transport work (freight)This ship 500 g CO₂/t·nm · median 253 (+98%)

48.6Ranks 275 of 408, lowest first1,247

Middle 80% of shipsMiddle 50%Ro-pax medianThis ship

Where the emissions happen, 2021

THETIS splits each ship's CO₂ by voyage type. The split sets how much falls under the EU ETS: all of it within the EU and at berth, half of it on voyages into or out of the EU.

Between EU ports0%
From the EU31%
Into the EU31%
At berth in the EU37%

Fuel burned laden

–

Not reported

CO₂ at berth

7,408 t

37.3% of the ship's CO₂, alongside in EU ports

Methane (CH₄)

–

Mainly from LNG; small for oil, biofuel and methanol

CO₂eq uplift

–

CO₂eq on top of CO₂ alone, from CH₄ and N₂O

Over the years

Full-year reports only. The Ro-pax median is the middle ship of all ro-pax ships reporting that year; it moves with the fleet, so a ship can gain on it without changing itself.

Fuel kg/nm

ISLE OF INNISFREE
Ro-pax median

120.0140.0160.0180.0200.0220.0

’182018’192019’202020’212021’222022’232023’242024’252025

Average speed, kn

ISLE OF INNISFREE
Ro-pax median

13.014.015.016.017.0

’182018’192019’202020’212021’222022’232023’242024’252025

CO₂ per transport work (freight), g CO₂/t·nm

ISLE OF INNISFREE
Ro-pax median

200300400500600

’192019’202020’212021’222022’232023’242024’252025

CO₂ per transport work (pax), g CO₂/pax·nm

ISLE OF INNISFREE
Ro-pax median

0.01,0002,0003,0004,000

’182018’192019’202020’212021’222022’232023’242024’252025

Year on year

Year	Average speed	Fuel kg/nm	Fuel per day at sea	Distance	CO₂ per transport work	Reading
2024→2025	+1.0 kn	+2%	+9%	+11%	+8%	1.0 kn faster, fuel per mile flat; better than speed alone explains (hull, engine or trade).
2023→2024	+0.6 kn	−6%	−2%	+5%	−5%	0.6 kn faster, fuel per mile down 6%; better than speed alone explains (hull, engine or trade).
2022→2023	−0.3 kn	+2%	−0%	−3%	+1,042%	Same speed, fuel per mile flat; worse than speed alone explains (fouling, weather, loading or trade).
2021→2022	+0.2 kn	+39%	+41%	+61%	+44%	Same speed, fuel per mile up 39%; worse than speed alone explains (fouling, weather, loading or trade).
2020→2021	+0.2 kn	−35%	−34%	+5%	−99%	Same speed, fuel per mile down 35%; better than speed alone explains (hull, engine or trade).
2019→2020	−0.2 kn	+10%	+9%	−41%	+109%	Same speed, fuel per mile up 10%; worse than speed alone explains (fouling, weather, loading or trade).
2018→2019	+0.0 kn	+3%	+3%	+1%	−46%	Same speed, fuel per mile up 3%; in line with the speed change.

Fuel per mile rises roughly with the square of speed for a given ship, so a change in speed explains much of a change in fuel per mile.

Every reporting year

One row per THETIS-MRV report. A ship that changed operator during a year has a part-year report for each.

Operation

Year	ISM company	Fuel t	CO₂ t	Distance nm	Hours at seah	Average speedknots at sea	Fuel kg/nmthis ship	CO₂ per transport work (cargo)g/t·nm, this ship	Laden fuel
2025	Matrix Ship Management LTD	15,547	48,647	84,689	5,461	15.5	184	–	–
2024	Matrix Ship Management LTD	13,808	43,428	76,513	5,279	14.5	181	–	–
2023	not published	13,941	44,068	72,669	5,223	13.9	192	–	–
2022	not published	14,128	45,094	74,912	5,273	14.2	189	–	–
2021	not published	6,316	19,838	46,465	3,319	14.0	136	–	–
2020	not published	9,226	28,897	44,367	3,218	13.8	208	–	–
2019	not published	14,095	44,150	74,862	5,341	14.0	188	–	–
2018	not published	13,550	42,426	74,027	5,274	14.0	183	401	–

Benchmark and verification

Year	ISM company	CO₂ per TW, g CO₂/pax·nm	Ro-pax median	vs Ro-pax	Rank	Freight, g CO₂/t·nm	Ro-pax median	vs Ro-pax	Verifier	Methods
2025	Matrix Ship Management LTD	532	567	−6%	195 of 408	500	253	+98%	DNV	B+C
2024	Matrix Ship Management LTD	491	547	−10%	194 of 404	498	233	+114%	DNV	B+C
2023	not published	519	680	−24%	159 of 386	490	234	+109%	DNV	B+C
2022	not published	45.5	626	−93%	25 of 394	561	253	+122%	DNV	B+C
2021	not published	31.5	815	−96%	22 of 377	377	226	+67%	DNV	B+C
2020	not published	3,222	751	+329%	363 of 387	215	217	−1%	Verifavia	B
2019	not published	1,545	569	+172%	343 of 394	215	223	−4%	Verifavia	B
2018	not published	2,837	729	+289%	325 of 361	–	–	–	Verifavia	B

Fuel per mile and CO₂ per tonne-mile are the ship's own reported KPIs. Ro-pax ships are benchmarked on CO₂ per transport work (pax) (TW), in g CO₂/pax·nm, and also per tonne of freight (g CO₂/t·nm freight). CO₂eq adds methane and nitrous oxide and is in the public files from 2024. Rank counts from the lowest figure among that year's ro-pax ships. Methods: A delivery notes, B tank monitoring, C flow meters, D direct measurement. FuelEU GHG intensity is not shown: it needs fuel types, which the public file does not carry. Operators are named only from 2024, the first year the public files carry them; earlier years belong to the ship, not to any company.