Onshore Power Supply

Air quality

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The switch from onboard-generated electricity to OPS will benefit local air quality significantly, as local emissions will be all but eliminated. These emissions will be replaced by lower emissions more remote from residential areas.

The following table reports the estimated reductions in local emissions calculated on the basis of the average EU-25 production mix.


Emission factors for auxiliary engines at berth, g/kWh of electricity NOX SO2 PM VOC
Shoreside electricity (compared with 2.7% S Residual Oil (RO)) -97% -96% -96% -94%
Shoreside electricity (compared with 0.1% S Marine Distillate (MD)) -97% 0% -89% -94%

Source: Service contract on Ship Emissions: assignment, abatement and market based instruments, Task 2a shoreside electricity, Entec, 2005


Factors influencing the actual emission reduction

Although OPS will in most situations result in significant emission reductions, the precise percentage will vary depending on the emission factors of both the auxiliary engines and the remote power supply.

To assess the effects of OPS on pollutant emissions, the website provides an OPS calculation tool.