EV Annual Fuel Cost and CO2 Savings


An EV with a fuel efficiency of 150Wh/km (or 1.5L/100k or 188mpg) travelling an annual distance of 16,000km will produce the following annual fuel cost savings:

  • €797 pa with respect to an equivalent Diesel or 80% saving
  • €1,264 pa with respect to an equivalent Petrol 86% saving

In terms of annual CO2 savings, the following savings will occur:

  • 523 kg per annum of CO2 with respect to an equivalent Diesel or 27% saving
  • 683 kg per annum of CO2 with respect to an equivalent Petrol or 33% saving

The Example below illustrates how these figures are derived. It is assumed that the Consumer is charging 100% of the time at their own Domestic location. 

To compare vehicles of your own choosing use SEAIs Performance Calculator provided below.

Please note these figures are illustrative only and final figures will depend on usage, driving style, weather, energy prices and chosen electricity tariffs.

EV Fuel Cost Comparison Example
Combined Fuel Efficiency 150Wh/km  (or 1.5L/100km)7L/100km5L/100km
Annual Mileagekm16,00016,00016,000
Annual Fuel RequirementLitresn/a1,120800
Energy Prices per unit (inclusive of all VAT, Duty, Levy and Carbon Tax)Euro/Litren/a1.311.25

Urban 24hr2, 3 = 0.1600

Night Saver2, 3 = 0.0846

Annual Fuel CostEuro

Urban 24hr = 384

Night Rate = 203

Maximum Annual EV Fuel Cost SavingsEuro-----1,264797


  1. 1. Electricity prices are those price inclusive of VAT @ 13.5%, these prices represent the additional cost on the existing Electricity Bill for the additional energy units, all PSO levies and Standing Charges remain unchanged unless the Consumer is switching Tariffs
  2. 2. Note there is no specific EV Tariff yet available for Domestic electricity supplied for an EV, if the Consumer switches Tariff from a 24hr Urban to a Night Saver Tariff, note that the Standing Charge and Day Rate prices of electricity will rise.  Although there is no cost for switching Tariffs, there may be a metering cost involved in switching back at a future date.
  3. 3. For a comparison of electricity tariffs available please see below links to a number of domestic electricity suppliers: 
    1. http://www.esb.ie/esbcustomersupply/residential/your_account/pricing.jsp 
    2. http://www.thebigswitch.ie 
    3. http://www.Airtricity.com 
EV CO2 Emission Comparison Example
Direct CO2 Emissions (ie Direct for EV)g/km0130120
Indirect CO2 Emissions from Electrical Grid1g/kWh582n/an/a
Annual ElectricitykWh2,400n/an/a
Annual Mileagekm16,00016,00016,000
Annual Direct CO2 EmissionsKg02,0801,920
Annual Indirect CO2 Emissionskg1,397n/an/a
Annual CO2 savingskg-----683523
Annual EV CO2 Savings%033%27%


Based on SEAI “Energy in Ireland – 2009 Report” average electricity generation mix, note that this CO2 intensity will continue to fall as Ireland’s Renewable Electricity content rises from the value of 14.4% in 2009 to 40% by 2020

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