A primeira reação nuclear em cadeia autosustentada controlada foi obtida em 2 de dezembro de 1942. Daí em diante, o crescimento da energia nuclear, inicialmente estimulado por fins militares, foi rápido. Ás aplicações civis no setor da geração de eletricidade foram adquirindo, ao longo do tempo, um papel sempre mais importante nas matrizes energéticas de muitos paises. Em 1987, 418 reatores nucleares no mundo estavam produzindo eletricidade em escala comercial. Dois terços destes reatores eram localizados em 7 países: Estados Unidos, União Soviética, França, Reino Unido, Alemanha, Canadá e Japão. Nos anos 90, o setor nuclear experimentou um grande retardo, devido principalmente ao acidente de Chernobyl e a uma revisão otimista das perspectivas de esgotamento das reservas de petróleo e dos outros combustíveis fosseis. Em 2005 o número de reatores para geração de eletricidade em operação no mundo era de 441, não muito diferente do numero de reatores em operação em 1987. Neste panorama o primeiro objetivo deste trabalho é analisar o estado da arte da geração núcleo elétrica e do ciclo do combustível nos países acima mencionados, partindo de uma revisão histórica. O caso do Brasil é abordado também por ser o país onde este trabalho é desenvolvido. Uma vez concluído o quadro da geração núcleo elétrica a nível internacional, são analisadas as novas tecnologias no setor da geração núcleo elétrica e as tendências e as iniciativas para o futuro da utilização da energia nuclear. São também abordadas as principais questões que sempre acompanharam o debate sobre a energia nuclear: a segurança, o meio ambiente, a proliferação e o mais moderno conceito de desenvolvimento sustentável. É importante antecipar que o objetivo deste trabalho não é de julgar os acontecimentos e de influenciar a opinião do leitor a favor da energia nuclear, mas de selecionar materiais e dados para informar e assim fornecendo um texto que seja uma coleção de informações e sugestões de aprofundamentos e não uma fonte de polêmicas. / On December 2, 1942, man first initiated a self-sustaining nuclear chain reaction, and controlled it. Since then, nuclear energy development, firstly estimulated by military goals, was fast. But nuclear energy use for electricity production grew too, until becoming a very important energy source in the world energy mix. In 1987 there were in the world 418 nuclear reactors capable of producing commercially useful supplies of electricity. Over two thirds were in just seven countries: United States, Soviet Union, France, United Kingdom, Germany, Canada and Japan. In the 90s, nuclear energy development slowed down as a consequence of the Chernobyl accident and of the more optimistic evaluations of world oil resources. In 2005 the number of nuclear reactors commercially producing electricity amounted to 441, not much more than the 418 reactors operating in 1987. From this point of view, the primary scope of this work is to analyze the world pattern and the state of the art of nuclear power production focusing on the countries above mentioned. Brazil case is analyzed too, since this work has been developed there. Once this international outlook is concluded, the next step passes through the analyses of new technologies, tendencies and initiatives for the future development of nuclear energy. Since feelings run high in the debate about nuclear energy, some fundamental and fervent points are raised: security, environment, proliferation and sustainable development. Nevertheless, it is important to point out that effort has been made in this work not to take sides, but to be impartial in selecting materials and giving data. The scope is not to convert the reader to a pro-nuclear view but to inform and, in doing so, to provide a volume that is a textbook and not a piece of polemic.

A primeira reação nuclear em cadeia autosustentada controlada foi obtida em 2 de dezembro de 1942. Daí em diante, o crescimento da energia nuclear, inicialmente estimulado por fins militares, foi rápido. Ás aplicações civis no setor da geração de eletricidade foram adquirindo, ao longo do tempo, um papel sempre mais importante nas matrizes energéticas de muitos paises. Em 1987, 418 reatores nucleares no mundo estavam produzindo eletricidade em escala comercial. Dois terços destes reatores eram localizados em 7 países: Estados Unidos, União Soviética, França, Reino Unido, Alemanha, Canadá e Japão. Nos anos 90, o setor nuclear experimentou um grande retardo, devido principalmente ao acidente de Chernobyl e a uma revisão otimista das perspectivas de esgotamento das reservas de petróleo e dos outros combustíveis fosseis. Em 2005 o número de reatores para geração de eletricidade em operação no mundo era de 441, não muito diferente do numero de reatores em operação em 1987. Neste panorama o primeiro objetivo deste trabalho é analisar o estado da arte da geração núcleo elétrica e do ciclo do combustível nos países acima mencionados, partindo de uma revisão histórica. O caso do Brasil é abordado também por ser o país onde este trabalho é desenvolvido. Uma vez concluído o quadro da geração núcleo elétrica a nível internacional, são analisadas as novas tecnologias no setor da geração núcleo elétrica e as tendências e as iniciativas para o futuro da utilização da energia nuclear. São também abordadas as principais questões que sempre acompanharam o debate sobre a energia nuclear: a segurança, o meio ambiente, a proliferação e o mais moderno conceito de desenvolvimento sustentável. É importante antecipar que o objetivo deste trabalho não é de julgar os acontecimentos e de influenciar a opinião do leitor a favor da energia nuclear, mas de selecionar materiais e dados para informar e assim fornecendo um texto que seja uma coleção de informações e sugestões de aprofundamentos e não uma fonte de polêmicas. / On December 2, 1942, man first initiated a self-sustaining nuclear chain reaction, and controlled it. Since then, nuclear energy development, firstly estimulated by military goals, was fast. But nuclear energy use for electricity production grew too, until becoming a very important energy source in the world energy mix. In 1987 there were in the world 418 nuclear reactors capable of producing commercially useful supplies of electricity. Over two thirds were in just seven countries: United States, Soviet Union, France, United Kingdom, Germany, Canada and Japan. In the 90s, nuclear energy development slowed down as a consequence of the Chernobyl accident and of the more optimistic evaluations of world oil resources. In 2005 the number of nuclear reactors commercially producing electricity amounted to 441, not much more than the 418 reactors operating in 1987. From this point of view, the primary scope of this work is to analyze the world pattern and the state of the art of nuclear power production focusing on the countries above mentioned. Brazil case is analyzed too, since this work has been developed there. Once this international outlook is concluded, the next step passes through the analyses of new technologies, tendencies and initiatives for the future development of nuclear energy. Since feelings run high in the debate about nuclear energy, some fundamental and fervent points are raised: security, environment, proliferation and sustainable development. Nevertheless, it is important to point out that effort has been made in this work not to take sides, but to be impartial in selecting materials and giving data. The scope is not to convert the reader to a pro-nuclear view but to inform and, in doing so, to provide a volume that is a textbook and not a piece of polemic.

Affordability of energy in the domestic sector is the product of three interrelated factors - level of household income, level of energy bills (which are a product of prices and levels of energy demand, mediated by tariffs and the retail market), and the amount of energy that a household needs to maintain a healthy living environment. This thesis focusses on the factors of affordability which are most relevant to the energy policy which are energy bills and energy efficiency, both of which are considered in the context of household income. Affordability of energy in Great Britain is important for separate, but over-lapping reasons. Firstly, it has important political impacts - as energy prices continue to rise, energy is repeatedly highlighted as one of the biggest financial concerns for households (uSwitch, 2013; YouGov, 2015; DECC, 2014f), leading affordability of energy to become an increasingly political issue (Lockwood, 2016). Secondly, affordability of energy has social implications which stem from the fact that the impact of rising energy bills is felt particularly strongly by those on low incomes and in inefficient homes – the fuel poor. In spite of it being twenty-five years since Brenda Boardman published her first book defining the issue of fuel poverty (Boardman, 1991), millions of households in Great Britain today still cannot afford adequate amounts of energy. This is significant because being able to afford access to basic levels of energy services such as warmth and light is essential for maintaining physical and mental health (Harrington et al., 2005; Stockton and Campbell, 2011). Thirdly, affordability has important implications for design of the energy system –a system focussed on minimising long-term costs, both through micro-scale features such as efficient network revenue regulation which keep costs down on a year-by-year basis, and macro-scale aspects such as through the development of a low-demand, highly flexible energy system which has the potential to bring costs down in the long term (Sanders et al., 2016), is likely to differ from one which in which affordability is less of a focus, or only a focus over the short term. This thesis responds to a gap in the literature in relation to the role that governance plays in affecting levels of affordability of energy for domestic consumers in Great Britain. It examines the impact of governance on energy prices and tariffs, and the impact of governance on energy efficiency of the housing stock in Great Britain. Both of these are examined in the context of levels of household income. Greater insight is gained by examining the impact of the energy governance structure in Denmark on Danish domestic energy efficiency standards, which are widely accepted to be very good (IEA, 2011). 7 This thesis makes use of existing academic and policy literature in tandem with data from fifty-six interviews with individuals from across the energy sectors in Great Britain and Denmark. The governance structure of energy in Great Britain is shown to be, on balance, not supportive of delivering affordable energy to domestic consumers. A number of specific issues within the current governance structure in Great Britain are identified. These include the presence of a limiting narrative, whereby policymakers consider affordability to be achieved principally through delivery of low prices; insufficient institutional capacity within OFGEM to keep network prices low, and monitor suppliers’ costs and profits; lack of wholesale market transparency; an anti-interventionist ideology leading to weak energy efficiency requirements for new-build and private rental properties; suppliers as poor executors of energy efficiency policy; weak demand-side interests; tariffs designed around the needs of suppliers, not consumers; an over-reliance on an uncompetitive retail market; a lack of institutional capacity amongst policy makers regarding energy efficiency, and network regulation; and weak consumer representation. A number of recommendations are put forward, including the fostering of a new narrative centred on energy efficiency; the redesign of tariffs to better protect the interests of consumers; the reallocation of responsibility for energy efficiency to local authorities; the development of greater institutional capacity among policymakers; the support for a more interventionist ideology supporting use of regulation; financial support for energy efficiency retrofit; the fostering of greater policy stability; development of new tariff structures; and the formation of a new consumer representative. Overall this thesis demonstrates that affordability of energy in unlikely to be delivered to domestic consumers in Great Britain unless significant changes are made to the governance structure of the energy sector.

This dissertation applies a variety of quantitative methods to European electricity market data to enable us to detect, understand, and eventually mitigate market imperfections. The empirical data indicate that market power and barriers to cross-border trade partially explain today’s market failures. Briefly, the five key findings of this dissertation are: First, we observe a decoupling between German electricity prices and fuel cost, even though British electricity prices are largely explained by short-run cost factors. Second, we demonstrate that rising prices of European Union emission allowances (EUA) have a greater impact on German wholesale electricity prices than falling EUA prices. Third, we reject the assumption of full integration of European wholesale electricity markets in 2002-2006; for several pairs of countries, the weaker hypothesis of (bilateral) convergence is accepted (i.e. efforts to develop a single European market for electricity have been only partially successful). Fourth, we observe that daily auction prices of scarce cross-border transmission capacities are insufficient to explain the persistence of international price differentials. Empirically, our findings confirm the insufficiency of explicit capacity auctions as stated in the theoretical literature. Fifth, we identify inefficiencies in the market behavior for the interconnector linking France and the United Kingdom (UK), for which several explanations, including market power, may be plausible.

Nach dem erheblichen Anstieg der Stromnetzentgelte in Deutschland in den vergangenen zehn Jahren ist zu erwarten, dass dieser Trend im Zuge der Energiewende weiterhin anhält: Der Zubau großer Kapazitäten von Windenergie- und Photovoltaikanlagen erfordert ebenso umfassende Investitionen in den Ausbau der Stromnetze, um die eingespeiste Energie abtransportieren zu können. Aufgrund der ungleichen Verteilung geeigneter Flächen, insb. für den Ausbau der Windenergie, sind und werden die Verbraucher in EE-starken Regionen von diesen Netzkosten ungleich höher belastet als Kunden in Regionen mit niedrigeren EE-Kapazitäten. Um diese Asymmetrie der Kostenbelastung abzumildern, beabsichtigt die Bundesnetzagentur, einen bundesweiten Wälzungsmechanismus zur Verteilung der EE-bedingten Netzkosten in Form einer bundesweit einheitlichen Umlage einzuführen. In der hier vorliegenden Analyse sind erstmals die langfristigen Auswirkungen dieser Reform mit Blick auf den voranschreitenden EE-Ausbau abgeschätzt. Im Ergebnis zeigt sich, dass im Jahr 2040 über die Hälfte der in Verteilungsnetzen anfallenden Kosten über die Umlage bundesweit gewälzt werden könnten. Von dieser Umverteilung profitieren überwiegend Kunden in ländlichen Gebieten, während Verbraucher insbesondere in großen Städten und kleineren Netzgebieten künftig erheblich höhere Lasten tragen müssen. Das Ziel einer gleichmäßigeren Beteiligung aller Verbraucher an den EE-bedingten Netzkosten wird damit zwar erreicht, zugleich bleiben jedoch künftige Herausforderungen unadressiert.:Zusammenfassung A 1 Aktueller Stand und historische Entwicklung der Stromnetzentgelte 1 2 Was zeigt der Vergleich der Abschätzung der Netzentgeltentwicklung mit den Ist-Netzentgelten? 4 3 Welche Ansätze für eine Netzentgeltsystematik bestehen? 9 3.1 Bestehende und künftige Herausforderungen 9 3.2 Optionen für eine effiziente kurzfristige Netzbewirtschaftung 10 3.3 Optionen zur Verteilung der Kapitalkosten für die Aufrechterhaltung und Weiterentwicklung der Netzinfrastruktur 12 4 Welche Änderungen der Entgeltsystematik werden vorgeschlagen? 15 4.1 Funktionsweise der gegenwärtigen Netzentgeltsystematik 15 4.2 Vorschlag der Bundesnetzagentur für einen bundesweiten Wälzungsmechanismus 17 4.3 Wesentliche Kritik der Stellungnahmen zum Eckpunktepapier 19 4.4 Anpassungen am Wälzungsmechanismus im Festlegungsentwurf der Bundesnetzagentur 22 4.5 Alternative Ansätze zur Netzkostenverteilung 23 5 Welche Auswirkungen sind von einer überregionalen Wälzung zu erwarten? 25 5.1 Auswirkungen des Wälzungsmechanismus im Status Quo 25 5.2 Auswirkungen des Wälzungsmechanismus bei Erreichen der EEG-Ausbauziele 27 5.2.1 Erfüllung der Ausbauziele für Windenergie 27 5.2.2 Erfüllung der EEG-Ziele für Photovoltaik 29 5.2.3 Erfüllung der EEG-Ziele für Wind und PV 30 6 Schlussfolgerungen der Analyse 32 Anhang 34 Literaturverzeichnis 35

Background and Purpose: The energy crisis that evolved from Russia’s attack on Ukraine had an impact on Swedish energy companies. Therefor these energy companies Karlstad Energy and Hedemora Energy published texts containing the word “energy crisis”. This study’s purpose was to understand how energy companies work with web published texts visually and textually after a crisis. To do this, the study focuses on the multimodal analysis method on texts from Karlstad Energy and Hedemora Energy.     Method: The study found usage of the semiotic visual analysis method and the content analysis method on the texts to answer the sought-out question that was created from the study’s purpose. These methods have different recommendations to help analyze material and which has been used to answer the study’s question. This was done to analyze the texts from Karlstad Energy and Hedemora Energy individually, then these analyses were put against each other to find differences and similarities.     Results and Conclusion: The results that came from these analyzes were that the companies Karlstad energy and Hedemora energy work differently on the web. They have multiple visual differences like their usage of color, divisions of the text on the web, usage of pictures and textual differences such as their response possibilities and their CEOs participation to the text and usage of the word “we”. Then there were some similarities, such as the company’s usage of big texts, their order of themes of texts and their statement of facts. With this, the Conclusion is that these companies, Karlstad Energy and Hedemora Energy work differently visually and textually. / Bakgrund och syfte: Rysslands angrepp mot Ukraina har medfört en energikris som påverkat energiföretag. Energiföretagen Karlstad Energi och Hedemora Energi har publicerat texter på sina webbsidor som nämner ordet ”energikrisen”. Studiens syfte är att förstå hur energiföretag använder sig av webben för kommunikation under och efter en kris. För detta syfte genomförs en multimodal analys av Karlstad Energi och Hedemora Energis publicerade texter på webben.     Metod: Den multimodala analysmetoden med specifikation av den semiotiska visuella analysmetoden och innehållsanalysmetoden användes för att besvara studiens frågeställning och konstruerades utifrån studiens syfte. Dessa metoder har flera rekommendationer som hjälper med analyserna och dessa användes för att få fram svaren till de visuella och textuella analyserna. Därmed analyserades texterna från webben individuellt och ställdes därefter emot varandra för att finna skillnader och likheter.     Resultat och slutsats: Det resultat som framgick var att företagen Karlstad Energi och Hedemora Energi har olika arbetssätt även om de är inom samma bransch. De har flera visuella kontraster som färgval, uppdelning av text på webben, användning av bilder, och flera textuella skillnader som responsmöjlighet, VDs tillägg till texten, användningen av ordet ”vi” m.fl. Likheter fanns i användningen av fetstil, rangordningen av teman och framkodning av påståenden. Resultatet är slutsatsen att företagen jobbar helt olika både visuellt som textuellt, även om de är inom samma bransch.