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            "title": "The role of district heating in future renewable energy systems",
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                    "firstName": "H.",
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            "abstractNote": "Based on the case of Denmark, this paper analyses the role of district heating in future Renewable Energy Systems. At present, the share of renewable energy is coming close to 20 per cent. From such point of departure, the paper defines a scenario framework in which the Danish system is converted to 100 per cent Renewable Energy Sources (RES) in the year 2060 including reductions in space heating demands by 75 per cent. By use of a detailed energy system analysis of the complete national energy system, the consequences in relation to fuel demand, CO2 emissions and cost are calculated for various heating options, including district heating as well as individual heat pumps and micro CHPs (Combined Heat and Power). The study includes almost 25 per cent of the Danish building stock, namely those buildings which have individual gas or oil boilers today and could be substituted by district heating or a more efficient individual heat source. In such overall perspective, the best solution will be to combine a gradual expansion of district heating with individual heat pumps in the remaining houses. Such conclusion is valid in the present systems, which are mainly based on fossil fuels, as well as in a potential future system based 100 per cent on renewable energy.",
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                    "firstName": "Claire",
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            "abstractNote": "In this study we explore the effects of different charging behaviors of PHEVs in the United States on electricity demand profiles and energy use, in terms of time of day and location (at home, the workplace, or public areas). Based on driving behavior statistics on vehicle distance traveled and daily trips (US DOT, 2003) in the US, we develop a simulation algorithm to estimate the PHEV charging profiles of electricity demand with plausible plug-in times and depth of discharge of the PHEVs.\n\nThe model enables simulations of the impacts of various grid management strategies on the availability of vehicle charging in public places, the charge power levels and standards, scheduling charging in off-peak periods and policy measures to promote PHEV adoption. PHEV charging imposes a modest pressure on system load on the order of 560–910 Wp per vehicle. We find that enabling charging in places other than home increases the daily electric energy use of PHEV from 24% to 29% (1.5–2 kWh/day). Major findings of the different scenarios are that PHEVs with a 20 mile range (PHEV-20) shift 45–65% of vehicle miles traveled in the United States to electricity, compared with 65–80% for PHEVs with a 40 mile range (PHEV-40).",
            "publicationTitle": "Energy Policy",
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            "abstractNote": "The current EU regulatory framework for CO2 emissions of cars is based on tank-to-wheel (TtW) emissions. In an exploratory study we have analysed what-if-scenarios within this regulatory framework to quantify the costs in attaining the TtW emission targets and possible impacts on the well-to-wheel (WtW) emissions of the EU’s new vehicle portfolio. In particular, we analysed the introduction of electric drive vehicles (EDV) and shifts between car segments. We performed the what-if-scenarios on the basis of the monitoring data for CO2 emissions from new passenger cars in the EU that was further reprocessed to achieve a break-down per vehicle segment, enriched with cost information and well-to-tank (WtT) emission data. Our calculations show that under the assumption that there are no significant segment shifts towards smaller vehicles, a minimum share of 11% of EDV would be needed to comply with a stricter CO2 target of 70 g/km, as improvements on conventional cars cannot provide sufficient savings. Deploying the EDV allows a cost effective achievement of the regulatory TtW targets, but also leads to higher WtW emissions than the baseline under the assumption that the TtW targets are not overachieved. Public incentives would be necessary to increase the share of EDV in the portfolio. We calculated that the order of magnitude of these incentives would be in the range of scrappage schemes that have been recently witnessed in European countries.",
            "publicationTitle": "Transportation Research Part A: Policy and Practice",
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            "title": "Environmental and Energy Implications of Plug-In Hybrid-Electric Vehicles",
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            "abstractNote": "We analyze the effect of charging a significant number of plug-in hybrid vehicles (PHEVs) in the United States using presently available night-time spare electric capacity in the short term and new base-load capacity in the long term. Nationwide, there is currently ample spare night-time utility capacity to charge even a large fleet of PHEVs. Using the mix of generating plants expected to be used for PHEV charging, we find that, while driving on battery power, PHEVs compared to their conventional hybrid counterparts reduce CO2 emissions by 25% in the short term and as much as 50% in the long term. The short-term fractional increase in demand for margin fuels such as natural gas is found to be roughly twice the fractional penetration of PHEVs into the nationwide light-duty vehicle fleet. We also compare, on an energy basis, the CO2 savings of replacing coal plants versus replacing conventional vehicles with PHEVs. The result is found to depend critically on the fuel economy of the vehicles displaced by the PHEVs.",
            "publicationTitle": "Environmental Science & Technology",
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            "itemType": "journalArticle",
            "title": "Energy use, cost and CO2 emissions of electric cars",
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                    "creatorType": "author",
                    "firstName": "Oscar",
                    "lastName": "van Vliet"
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                    "creatorType": "author",
                    "firstName": "Anne Sjoerd",
                    "lastName": "Brouwer"
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                    "creatorType": "author",
                    "firstName": "Takeshi",
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                    "firstName": "Machteld",
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                    "firstName": "André",
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            "abstractNote": "We examine efficiency, costs and greenhouse gas emissions of current and future electric cars (EV), including the impact from charging EV on electricity demand and infrastructure for generation and distribution.\n\nUncoordinated charging would increase national peak load by 7% at 30% penetration rate of EV and household peak load by 54%, which may exceed the capacity of existing electricity distribution infrastructure. At 30% penetration of EV, off-peak charging would result in a 20% higher, more stable base load and no additional peak load at the national level and up to 7% higher peak load at the household level. Therefore, if off-peak charging is successfully introduced, electric driving need not require additional generation capacity, even in case of 100% switch to electric vehicles.\n\nGHG emissions from electric driving depend most on the fuel type (coal or natural gas) used in the generation of electricity for charging, and range between 0 g km−1 (using renewables) and 155 g km−1 (using electricity from an old coal-based plant). Based on the generation capacity projected for the Netherlands in 2015, electricity for EV charging would largely be generated using natural gas, emitting 35–77 g CO2 eq km−1.\n\nWe find that total cost of ownership (TCO) of current EV are uncompetitive with regular cars and series hybrid cars by more than 800 € year−1. TCO of future wheel motor PHEV may become competitive when batteries cost 400 € kWh−1, even without tax incentives, as long as one battery pack can last for the lifespan of the vehicle. However, TCO of future battery powered cars is at least 25% higher than of series hybrid or regular cars. This cost gap remains unless cost of batteries drops to 150 € kWh−1 in the future. Variations in driving cost from charging patterns have negligible influence on TCO.\n\nGHG abatement costs using plug-in hybrid cars are currently 400–1400 € tonne−1 CO2 eq and may come down to −100 to 300 € tonne−1. Abatement cost using battery powered cars are currently above 1900 € tonne−1 and are not projected to drop below 300–800 € tonne−1.",
            "publicationTitle": "Journal of Power Sources",
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            "abstractNote": "Energy systems integration in the Hawaiian island of Maui is unique because of the island's high renewable energy (RE) penetration, advanced adoption of plug-in vehicles, distributed power generation, and isolated island electrical system. Currently, a large amount of wind power produced on Maui is curtailed because the power cannot be accommodated by the existing power grid. Analysis of changes in electrical grid operations to reduce wind and anticipated solar curtailment and look at energy pathways across the electrical and transportation sectors has resulted in a more comprehensive understanding of energy use on the island.",
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            "abstractNote": "The main aims of the energy policy of the European Union (EU) are 1) to establish a European energy system that is sustainable (particularly with respect to reducing greenhouse-gas emissions) and enhances Europe's competitiveness and 2) to improve the security of energy supplies to Europe's 500 million inhabitants. A key element of Europe's strategies to achieve these aims is to establish a more integrated energy system in which there is a well-connected and competitive market, particularly for gas and electricity. A pan-European energy infrastructure (analogous to those in place in other sectors of long-term public interest, such as telecommunications and transport) is seen as an essential enabler.",
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