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Energy Systems and Technologies for the Coming Century ...

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2 MethodCar choice gamesThe objective of this stage is to obtain household preferences <strong>for</strong> alternative fuelledvehicles <strong>and</strong> to identify trade-offs <strong>and</strong> incentives <strong>for</strong> households to switch to cleanervehicle technologies. Vehicle options are labelled based on <strong>the</strong> fuel-type <strong>and</strong> class/sizeof <strong>the</strong> vehicle. The fuel-type label includes five options:Conventional gasoline <strong>and</strong> conventional dieselHydrogenhybrid-electricHydrogenElectricEach respondent gets 3 sets of choice situations. In each of <strong>the</strong> 3 sets, <strong>the</strong> choice sets <strong>for</strong><strong>the</strong> respondents were selected r<strong>and</strong>omly.There are 10 different combinations of technologies.Choice set 1 Choice set 2 Choice set 3Conventional vs Hydrogen Hydrogen vs Hybrid Bio fuel vs Plug-inConventional vs Hybrid Hydrogen vs Biofuel Bio fuel vs HybridConventional vs Biofuel Hydrogen vs Plug-in Plug-in vs. HybridConventional vs Plug-in2.1 Choice DesignDuring each choice set, <strong>the</strong> reference technology <strong>and</strong> <strong>the</strong> alternative technology are keptconstant. Thus, in game 1 each respondent is asked to choose between <strong>the</strong> conventionalvehicle with unchanged characteristics <strong>and</strong> an alternative technology with varyingcharacteristics.As mentioned above, <strong>the</strong> design consists of three sets of games with four choices in eachgame <strong>for</strong> each respondent.The general idea is that <strong>the</strong> left-h<strong>and</strong> vehicle (<strong>the</strong> reference vehicle) is a vehicle of <strong>the</strong>same size <strong>and</strong> price as <strong>the</strong> vehicle recently purchased by <strong>the</strong> respondent. The right-h<strong>and</strong>vehicle (<strong>the</strong> alternative) has varying characteristics in each game.The table below shows how <strong>the</strong> characteristics <strong>for</strong> <strong>the</strong> alternative vehicle are variedduring <strong>the</strong> games.Table 2-1Attributes <strong>and</strong> levelsItemAlternatives/LevelsPurchase price R<strong>and</strong>omly, continuous up to ±50%Annual fuel cost <strong>and</strong> maintenance R<strong>and</strong>omly, continuous up to ±25%Range, Hydrogen-vehicles r<strong>and</strong>omlyonce a monthonce every three weeks<strong>for</strong>tnightlyOnce a weektwice a weekevery o<strong>the</strong>r dayevery dayRange o<strong>the</strong>rAverage (20% from empty of car bought)Page 2 of 12Risø International <strong>Energy</strong> Conference 2011 Proceedings Page 323

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