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Energy Systems and Technologies for the Coming Century ...

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Night time charging increases with increasing battery capacity <strong>for</strong> both BEVs <strong>and</strong>PHEVs. Slight trend of less charge during <strong>the</strong> day <strong>for</strong> <strong>the</strong> BEVs, <strong>the</strong> larger <strong>the</strong> battery.Discharging – or V2G – is used very differently from country to country. In Norway <strong>the</strong>V2G is not used at all – probably due to <strong>the</strong> availability of hydro storage <strong>and</strong> flexibilityenabling large integrations of wind power. For Denmark <strong>the</strong> BEVs are used <strong>for</strong> V2Garound 6 p.m. <strong>for</strong> large batteries <strong>and</strong> with 72kWh batteries V2G is widely used during<strong>the</strong> day (btw 8 a.m. <strong>and</strong> 3p.m.). The PHEVs are used <strong>for</strong> V2G to some extent. ForSweden <strong>and</strong> Finl<strong>and</strong>, V2G is widely used <strong>for</strong> <strong>the</strong> BEVs with <strong>the</strong> large battery capacities(58kWh <strong>and</strong> 72kWh) between 8a.m. <strong>and</strong> 7p.m., whereas, V2G is rarely used <strong>for</strong> <strong>the</strong>PHEVs. In Germany, however, V2G is heavily used <strong>for</strong> all battery sizes <strong>and</strong> <strong>for</strong> bothPHEVs <strong>and</strong> BEVs all times of day. This is due to <strong>the</strong> batteries enabling a more stableproduction on <strong>the</strong> remaining fossil power plants.Electricity pricesIn Denmark, Norway, <strong>and</strong> Germany, electricity prices are more even <strong>the</strong> larger <strong>the</strong>batteries. Thus, lower peaks <strong>and</strong> higher downs in <strong>the</strong> prices are experienced. In Finl<strong>and</strong>,electricity prices are increasing slightly with larger battery capacities, although, still withless distinct peaks <strong>and</strong> downs. Finally, Sweden experiences increasing prices withincreasing battery capacities. The stable production makes <strong>the</strong> power prices increase.4.2 Battery price changeInvestments are in ei<strong>the</strong>r PHEVs or diesel vehicles when optimising investments invehicles. Interestingly, battery prices as well as battery capacity have to be very high <strong>for</strong>EDVs not to be beneficial <strong>for</strong> <strong>the</strong> integrated power <strong>and</strong> transport system. Diesel vehiclesare optimal only in situations with battery capacity of 11.5kWh <strong>and</strong> a battery price of600€/kWh or battery capacity of 15 kWh <strong>and</strong> a battery price of ei<strong>the</strong>r 500€/kWh or600€/kWh. Note that this counts both <strong>for</strong> countries with primary investments in coal <strong>and</strong>countries with primary investments in wind.5 DiscussionThe analyses presented are based on an optimisation model assuming rational behaviour.As <strong>for</strong> <strong>the</strong> heat <strong>and</strong> power system this assumption does to a large extent seem reasonablewith all players minimising costs. For investments in private vehicles, however, peopleact less rational <strong>and</strong> choices are often based on both preferences <strong>and</strong> wealth. Although<strong>the</strong> results shown are optimal, investments in vehicles will most likely differ from this,yet, incentives could still be considered in order to move towards a beneficial solution<strong>for</strong> <strong>the</strong> integrated power <strong>and</strong> transport system.Optimising <strong>the</strong> load factor is of interest <strong>for</strong> future analyses. This could be done insituations where investments are not included. Optimising <strong>the</strong> load, when leaving <strong>the</strong>grid, is expected to increase <strong>the</strong> value of <strong>the</strong> EDVs <strong>and</strong> might result in EDVs beingbeneficial in all <strong>the</strong> scenarios investigated in this paper.6 Concluding remarksAs has been showed in this paper, optimal investments are in most cases in EDVs. Onlywith very large batteries <strong>and</strong> high battery costs, optimum changes to investments indiesel vehicles. Thus, optimum is not as sensitive to <strong>the</strong> battery prices as expected.Configuring <strong>the</strong> power system <strong>and</strong> generating electricity is sensitive to <strong>the</strong> batterycapacity. The largest changes happen from <strong>the</strong> 3kWh to 6kWh batteries in <strong>the</strong> PHEVs,with large increases in coal use in Germany <strong>and</strong> Finl<strong>and</strong> <strong>and</strong> decrease in coal inDenmark. The use of wind power increases most significantly with <strong>the</strong> small batteries inboth Denmark <strong>and</strong> Norway. The need <strong>for</strong> natural gas is increasing in scenarios withRisø International <strong>Energy</strong> Conference 2011 Proceedings Page

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