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LEC ENERsim features
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Maritime

Optimize ship energy systems under maritime regulations

Model the complete energy system of a vessel, including propulsion, auxiliary power, heat, fuels and shore power. Find the lowest-cost compliant design and operation under EU ETS, FuelEU Maritime, the IMO Net-Zero Framework and CII.

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ENERsim maritime settings dialog with the FuelEU Maritime tab: target year, GHG limit, penalty, RFNBO reward factor, pooling and onshore power obligation

Maritime regulations

Include the costs, penalties and rewards of all relevant maritime regulations in the optimization, and weigh them against fuel and technology costs.

  • EU ETS on tank-to-wake emissions, weighted by the EU share of each voyage leg
  • FuelEU Maritime with pooling, banking, escalating penalties for consecutive deficits and the RFNBO reward factor
  • IMO Net-Zero Framework with Tier 1 and Tier 2 remedial units and surplus units
  • CII: attained and required carbon intensity with an A to E rating
ENERsim maritime results with the voyage profile: docking periods, emission control areas, EU and IMO scope and ship speed over time

Voyage profiles

Define the voyage as a time-resolved profile of port stays, sailing legs and regulatory scope.

  • Shore power and bunkering during port stays
  • Time-resolved EU and IMO scope shares and emission control areas (ECA)
  • Fuel switching in emission control areas
  • Evaluate slow steaming options
ENERsim fuel tank dialog with LNG as fuel, FuelEU default GHG accounting, e-fuel production pathway and RFNBO classification

Fuels and well-to-wake emissions

Compare conventional and alternative fuels from fossil, bio and e-fuel pathways, using FuelEU default emission factors or your own values.

  • VLSFO, HFO, MGO, LNG, methanol, liquid and compressed hydrogen, ammonia
  • Methane slip by LNG engine type, N₂O emissions from ammonia engines
  • Boil-off gas from LNG and hydrogen: use, flaring and venting
  • Actual emissions alongside regulation-weighted emissions
  • Cost of lost cargo capacity due to the volume and mass of onboard equipment
ENERsim system builder with the maritime module library: engines and power, heat, and fuel and shore supply components for a vessel

Ship component library

Build onboard and shore-side energy systems, from conventional engines to wind-assisted propulsion and fuel cells.

  • Main engines, gensets and dual-fuel engines with pilot fuel
  • Shaft generators, wind-assisted propulsion, fuel cells, batteries and heat pumps
  • Onshore power supply (OPS) and bunkering with per-call costs
  • Onboard carbon capture with CO₂ storage and offloading
ENERsim maritime results tables for EU ETS and FuelEU Maritime: emissions in scope, CO₂ costs, GHG intensity and compliance balance

Compliance results

View the voyage profile and time-resolved GHG emissions per regulatory scope, and detailed results for each regulation.

  • EU ETS allowances and costs, net of captured CO₂
  • FuelEU compliance balance, penalties and pooling result
  • IMO Net-Zero Framework remedial units and surplus units
  • Annual CII rating, fuel consumption and GHG emissions per component

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