Página 1 dos resultados de 414 itens digitais encontrados em 0.001 segundos

Crise financeira, energia e sustentabilidade no Brasil; Financial crisis, energy and sustainability in Brazil

LUCON, Oswaldo; GOLDEMBERG, Jose
Fonte: Instituto de Estudos Avançados da Universidade de São Paulo Publicador: Instituto de Estudos Avançados da Universidade de São Paulo
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
27.21%
A recente crise financeira global traz consigo efeitos como a redução da atividade econômica e, consequentemente, do consumo de energia. Essa pode ser uma importante oportunidade para reorganizar o sistema energético em bases mais sólidas e sustentáveis: a eficiência, a maior participação das fontes renováveis e a descentralização da produção de energia. O Brasil e outros países em desenvolvimento podem aproveitar a experiência dos países desenvolvidos em eficiência energética, complementando com um programa vigoroso em energias renováveis, particularmente as "modernas" (eólica, solar, biomassa e pequenas hidrelétricas). Entretanto, preocupa o cenário inercial nacional, baseado num aumento da participação das fontes fósseis de energia na matriz, na priorização dos recursos à exploração de petróleo e gás natural e na manutenção de padrões insustentáveis de produção e consumo.; The recent global financial crisis brings about effects such as a reduction in the economic activity and consequently in energy consumption. This may be an important opportunity to reorganize the energy system under more solid and sustainable foundations: efficiency, higher share of renewables and decentralized energy production. Brazil and other developing countries can leapfrog the experience acquired by developed nations in energy efficiency...

Metodologia para dimensionamento de turbinas Banki para aplicação microhídricas em antigos moinhos

Gonçalves, Tiago José Magalhães
Fonte: Universidade do Minho Publicador: Universidade do Minho
Tipo: Trabalho de Conclusão de Curso
Publicado em //2011 POR
Relevância na Pesquisa
26.94%
Dissertação de mestrado integrado em Engenharia Mecânica; A crescente preocupação com o ambiente e com a dependência energética dos países da UE levou a que fosse alterada a forma de pensar e que se criassem metas para as energias renováveis, diminuindo os impactos ambientais e a dependência energética externa. Estas metas foram já definidas para o ano de 2020, sendo muito ambiciosas para todos os estados membros, e em particular para Portugal. Portugal aposta já há largos anos nas energias renováveis, como é o exemplo o extraordinário crescimento da energia eólica. Mais recentemente, a retoma do Plano Nacional de Barragens veio também reforçar o objectivo de crescimento do peso das renováveis. Com a publicação de legislação de apoio à micro e miniprodução de electricidade de origem renovável baseada em tarifas mais elevadas, abriu-se um nicho de investimento para particulares e empresas. Estas tarifas tornaram apelativo o investimento de risco em tecnologias inovadoras e de pequena dimensão. Com a abertura deste campo de investimento, nasce o interesse presente nesta dissertação que é a possibilidade de aplicação da microprodução em locais de antigos moinhos. Devido a esse facto, este trabalho inicia-se com a revisão bibliográfica dos vários tipos de moinhos em Portugal. Foi possível através çardeste levantamento...

O planeamento e controlo na EDP Renováveis Portugal

Castro, Pedro Jorge Oliveira Maia e
Fonte: Universidade Católica Portuguesa Publicador: Universidade Católica Portuguesa
Tipo: Dissertação de Mestrado
Publicado em 14/04/2014 POR
Relevância na Pesquisa
27.21%
Durante a realização do estágio na EDP Renováveis Portugal, foi possível perceber, cada vez mais, como funcionava o negócio da mesma. Assim, neste relatório de estágio, complementando com a minha experiência profissional adquirida ao longo deste 6 meses, foi possível inquirir e analisar vários aspetos do negócio da EDP Renováveis Portugal. Foram, portanto, analisados vários Rácios económico-financeiros que constatam a grande posição financeira da EDPR Portugal no negócio das Energias Renováveis. Por fim, foi ainda analisada a necessidade da EDPR Portugal em adaptar o seu reporting face às novas necessidades e realidades da sociedade.; During the internship in EDP Renewables Portugal, it was possible to perceive how the company runs its business. Thus, in this report, complemented with my professional experience over the last months, it was possible to investigate and analyze various aspects of EDP Renewables Portugal’s business. Were, therefore, analyzed some economic-financial ratios that identify the great financial position of EDPR business Portugal in Renewable Energy. Finally, we further analyzed the need of EDPR Portugal to adapt their reporting face the new needs and realities of the society.

Market Design with Wind: Managing low-predictability in intraday markets

HENRIOT, Arthur
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf; digital
EN
Relevância na Pesquisa
26.94%
This paper evaluates the benefits for wind power producers to trade in the intraday electricity markets in a context of massive penetration of intermittent renewables. Using a simple analytical model we find out that there are situations when it will be costly for those producers to adjust their positions in intraday markets. A first key factor is of course the technical flexibility of the power system: if highly flexible units provide energy at very low prices in real-time there is no point in participating into intraday markets. Besides, we identify the way wind production forecast errors evolve constitutes another essential, although less obvious, key-factor. Both the value of the standard error and the correlation between forecasts errors at different gate closures will determine the strategy of the wind power producers. Policy implications of our results are the following: low liquidity in intraday markets will be unavoidable for given sets of technical parameters, it will also be inefficient in some cases to set discrete auctions in intraday markets, and compelling players to adjust their position in intraday markets will then generate additional costs.

The market value of variable renewables

HIRTH, Lion
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf; digital
EN
Relevância na Pesquisa
37.58%
This paper provides a comprehensive discussion of the market value of variable renewable energy (VRE). The inherent variability of wind speeds and solar radiation affects the price that VRE generators receive on the market (market value). During wind and sunny times the additional electricity supply reduces the prices. Because the drop is larger with more installed capacity, the market value of VRE falls with higher penetration rate. This study aims to develop a better understanding how the market value with penetration, and how policies and prices affect the market value. Quantitative evidence is derived from a review of published studies, regression analysis of market data, and the calibrated model of the European electricity market EMMA. We find the value of wind power to fall from 110 percent of the average power price to 50-80 percent as wind penetration increases from zero to 30 percent of total electricity consumption. For solar power, similarly low values levels are reached already at 15 percent penetration. Hence, competitive large-scale renewables deployment will be more difficult to accomplish than many anticipate. • The variability of solar and wind power affects their market value. • The market value of variable renewables falls with higher penetration rates. • We quantify the reduction with market data...

Melting-pots and salad bowls : the current debate on electricity market design for RES integration

HENRIOT, Arthur; GLACHANT, Jean-Michel
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf; digital
EN
Relevância na Pesquisa
27.21%
This paper discusses a series of issues regarding the economic integration of intermittent renewables into European electricity markets. This debate has gained in importance following the large-scale deployment of wind farms and photovoltaic panels. As intermittent renewables constitute a significant share of the installed generation capacity, they cannot be kept isolated from the electricity markets. We argue that RES integration is first and foremost an issue of economic efficiency, and we review the main debates and frameworks that have emerged in the literature. We first consider to what extent intermittent resources should be treated the same way as dispatchable resources. We then analyse the different tools that have been proposed to ensure the required flexibility will be delivered: finer temporal granularity and new price boundaries, integration of a complex set of balancing markets, and introduction of tailor-made capacity remuneration mechanisms. Finally we introduce the topic of space redistribution, confronting cross-continental markets integration to the emergence of a mosaic of local markets.

In search of an EU energy policy for Mediterranean renewables exchange : EU-wide system vs. ‘corridor by corridor’ approach

GLACHANT, Jean-Michel; AHNER, Nicole
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Relatório Formato: application/pdf; digital
EN
Relevância na Pesquisa
27.21%
• To date there is no clear EU legal and regulatory framework governing renewables exchange across the Mediterranean. It is a patchwork of Member State, third country and EU energy regulation, complemented by case-sensitive renewables-specific trade arrangements that frame EU imports of energy from renewable sources (RES-E) generated by projects currently under development in the Middle East and North Africa region (MENA). • As the vision of a Mediterranean energy market for electricity requires extensive investments, institutional and legal reforms and a high level of regulatory accord among EU and MENA countries that is not attainable in the near future, we are in practice moving towards a ‘corridor-by-corridor’ approach rather than towards a fully-fledged EU-style system for Mediterranean RES-E exchanges. • The various regional institutions and organisations involved in EU-MED energy cooperation are crucial for regulatory convergence at the regional level, and thus to enable Mediterranean RES-E trade initiatives. • Since the Green Package allows Member States to use RES-E from non-EU countries for their EU-RES target compliance only if the green energy is physically imported into the EU and does not allow for statistical transfers between the Member States and the third countries...

CO2 abatement from renewables in the German electricity sector : does a CO2 price help?

WEIGT, Hannes; ELLERMAN, Denny; DELARUE, Erik
Fonte: Elsevier Science Bv Publicador: Elsevier Science Bv
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
26.94%
The overlapping impact of the Emission Trading System (ETS) and renewable energy (RE) deployment targets creates a classic case of interaction effects. Whereas the price interaction is widely recognized and has been thoroughly discussed, the effect of an overlapping instrument on the abatement attributable to an instrument has gained little attention. This paper estimates the actual reduction in demand for European Union Allowances that has occurred due to RE deployment focusing on the German electricity sector, for the five years 2006 through 2010. Based on a unit commitment model we estimate that CO2 emissions from the German electricity sector are reduced by 35 to 60 Mtons, or 10% to 18% of what estimated emissions would have been without any RE policy but with the CO2 price remaining in place at the observed level. Furthermore, we find that the abatement attributable to RE injections is greater in the presence of an allowance price than otherwise. The same holds for the ETS effect in presence of RE injection. This interaction effect is consistently positive for the German electricity system, at least for the considered years, and on the order of 0.5% to 1.5% of emissions.; This article is based on EUI RSCAS WP; 2012/18 [Loyola de Palacio Chair] Climate Policy Research Unit

Capturing synergies among the power markets around the Mediterranean

VAN SON, Paul; RUDERER, Dominik
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf; digital
EN
Relevância na Pesquisa
27.21%
This article highlights the effects of emerging renewables around the Mediterranean in a larger context. In particular, it emphasises the impressive synergies that can be captured by integrating (de-)centralised renewables of any size and dynamic into a larger transmission system and energy market context. The paper recommends various measures which national governments could use to reap the benefits associated with clean energy, particularly for desert regions.

Infraventus-internationalizing a renewables business to Kenya

Proença, Mariana
Fonte: Universidade Nova de Lisboa Publicador: Universidade Nova de Lisboa
Tipo: Dissertação de Mestrado
Publicado em /06/2015 ENG
Relevância na Pesquisa
27.21%
Infraventus – Internationalizing a Renewables Business to Kenya Infraventus is a renewable energy development company, with a consolidated experience, since 1988, in developing, constructing and operating projects mainly in Portugal, but also in other countries: Spain, Poland, France, Australia, Finland and Panama, and is now regarding Kenya as a possible destiny. Kenya is the biggest economy of East Africa, with a growing GDP around 5% and a low level of electric grid coverage thru its territory, 33% of national access to electricity. Kenya energy policy is intended to promote the investment in renewables; wind and sun are existing resources in good measures. Kenya is an interesting destiny to Infraventus, but has many risks. The objective of this dissertation is to evaluate the possible advantages of this investment and risks and propose recommendations about how to mitigate them considering alternative entry mode

CASCADE MINTS Project: Report on Renewables Case for POLES

RUSS HANS PETER; SZABO' Laszlo'
Fonte: ECN - Energy Research Centre of the Netherlands Publicador: ECN - Energy Research Centre of the Netherlands
Tipo: Articles in books Formato: Printed
ENG
Relevância na Pesquisa
27.21%
The report summarises the main results of the POLES model from the scenarios analysed in the CASCADE MINTS project to assess the role of renewables in the global and European energy and environmental systems. Two scenarios have been analysed, where two target levels of renewables for 2020 were set (12% and 20% in primary energy terms). Both the required level of subsidisation and the impacts on the energy systems are analysed.; JRC.J.2-Competitiveness and Sustainability

In search of a 'platform' for Mediterranean renewables exchange : 'EU-style' system vs. a 'corridor-by-corridor' approach

AHNER, Nicole; GLACHANT, Jean-Michel
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Trabalho em Andamento Formato: application/pdf
EN
Relevância na Pesquisa
27.21%
Recent years have seen increasing efforts in Europe to win the Southern Mediterranean countries as new suppliers of energy from renewable sources (RES-E). Massive amounts of green electricity that is generated in the Middle East and the North Africa (MENA) regions might someday be consumed in the EU. However, beyond the stark invocation of an Euro-Mediterranean RES-E exchange, less attention has been given to its actual implementation. This article takes stock of the applicable EU regime that governs the transfer of green electricity via Maghreb-EU corridors. In our investigation, centre stage is given to Article 9 of Directive 2009/28/EC (RES Directive), which introduced the opportunity for the EU Member States to receive credit towards their 2020 targets for clean power generated in third countries, provided that it is consumed inside the EU. We will argue that the EU, in practice, is moving towards a ‘corridor-by-corridor’ approach, rather than towards a fully-fledged ‘EU-style’ system.

Independent regulatory agencies and rules harmonization for the electricity sector and renewables in the Mediterranean region

CAMBINI, Carlo; FRANZI, Donata
Fonte: Instituto Universitário Europeu Publicador: Instituto Universitário Europeu
Tipo: Artigo de Revista Científica
EN
Relevância na Pesquisa
27.21%
Available online 30 May 2013.; The paper analyses the existing regulatory framework for the electricity and renewables sectors, and the role of regulatory agencies in Northern Africa and Middle East countries, under the promotion by the European Union. Using data collected through an original survey directed at regulators, ministry departments and energy companies of the southern Mediterranean, the study is aimed at assessing the extent of agencies' independence looking at three main dimensions of independence: regulatory instruments available to regulators and decision making autonomy; regulators' organizational autonomy; and regulators accountability. Results show that those countries having established an independent regulator have a more credible regulatory framework than those countries in which such a body does not exist. In particular, the analysis shows that Turkey, Croatia and Jordan have defined a regulatory framework that limits administrative expropriation and, consequently, creates an environment more suitable for attracting investments in the electricity and renewables sector. On the institutional ground, this is probably related with the harmonization of regulatory standards promoted by the European Union through the neighboring policy...

Motivações, obstáculos e modos de entrada na internacionalização das empresas : o caso da EDP Renováveis nos EUA

Herédia, Pedro Andresen Guimarães de
Fonte: Instituto Superior de Economia e Gestão Publicador: Instituto Superior de Economia e Gestão
Tipo: Dissertação de Mestrado
Publicado em //2011 POR
Relevância na Pesquisa
27.5%
Mestrado em Ciências Empresariais; Proposta: A realização desta dissertação tem como principal objectivo estudar o processo de internacionalização das empresas. Ou seja, perceber o que leva as empresas a internacionalizarem-se, quais os seus modos de entrada, e quais os grandes obstáculos que encontram ao longo de todo este processo. Metodologia: A metodologia utilizada neste trabalho é o estudo de caso. É feito um estudo de caso relativo à empresa EDP Renováveis. Resultados/Conclusões: A primeira conclusão deste estudo é a de que as motivações para a internacionalização das empresas prendem-se simultaneamente com razões internas e externas à própria empresa. A vontade de crescer, de ganhar dimensão, e de ser líder de mercado, são exemplos de motivações internas que levaram a EDP Renováveis a internacionalizar-se. A saturação do mercado doméstico e a facilidade de acesso ao crédito são exemplos de motivações externas referidas pela empresa. A segunda conclusão deste estudo é a de que os obstáculos à internacionalização, tal como as motivações, podem ser internos ou externos à empresa. A EDP Renováveis destaca sobretudo dificuldades externas à empresa, como o pouco conhecimento do mercado de destino...

Take-or-pay Contracts for Renewables Deployment

Johnston, Angus; Kavali, Amalia; Neuhoff, Karsten
Fonte: Faculty of Economics, University of Cambridge, UK Publicador: Faculty of Economics, University of Cambridge, UK
Tipo: Trabalho em Andamento
EN
Relevância na Pesquisa
27.21%
Renewables require support policies to deliver the European 20% target. We discuss the requirements for least cost development and efficient operation and quantify how different schemes (i) allow for the development of a renewable energy technology portfolio; (ii) reduce rent transfers to infra-marginal technologies or better than marginal resource bases; and (iii) minimise regulatory risk and thus capital costs for new projects. Long-term take or pay contracts minimise regulatory uncertainty, create appropriate incentives for location and operation, allow for efficient system operation and seem compatible with European state aid. We discuss how property rights legislation protects existing renewables investors, and thus can ensure ongoing investment during a transition towards the new scheme.

An expensive diversion

Krane, Jim
Fonte: Faculty of Economics, University of Cambridge, UK Publicador: Faculty of Economics, University of Cambridge, UK
Tipo: Trabalho em Andamento
Relevância na Pesquisa
27.38%
In the midst of a shortage of natural gas, Abu Dhabi has launched an investment into renewable energy. Why? Will renewables allow the Persian Gulf sheikhdom to meet rising electricity demand without simultaneous increases in conventional power? No. Even in one of the world?s sunniest places ? but not one of its windiest ? conventional solar generation is unable to handle a demand peak that extends past sundown. Renewables offer an intermittent electricity supply at a much higher average cost than the existing gasfired system. Abu Dhabi will be neither able to forgo construction of a single conventional generating plant, nor reduce its reliance on gas imports from Qatar. The contribution to energy security will be negligible. This paper finds two main benefits, among several limitations. First, renewables may allow reduced fuel consumption in conventional power plants, which will cut carbon emissions and burning of expensive backup fuels. Second, the highly publicized investment has improved the regime?s international image, bringing acclaim as a leader in clean energy, despite its status as a key OPEC oil producer. In the political context of a rentier monarchy, such prestige is as an important source of domestic legitimacy.

Can current electricity markets cope with high shares of renewables? A comparison of approaches in Germany, the UK and the State of New York

Pollitt, Michael G.; Anaya, Karim L.
Fonte: International Association for Energy Economics Publicador: International Association for Energy Economics
Tipo: Article; accepted version
EN
Relevância na Pesquisa
37.58%
This is the author accepted manuscript. It is currently embargoed pending publication.; This paper looks at the empirical and theoretical background to high shares of renewables in the electricity system. First we examine what is meant by ?high shares? of renewables; next we consider what we mean by electricity ?markets?; then we discuss what the term ?cope with? implies; before returning to the suitability of ?current? electricity markets. Second, we turn to three examples of jurisdictions ? Germany, the UK and the State of New York in the US - with specific aspirations for decarbonisation and the role of renewables. Each exhibits very different approaches to the way they are adjusting their electricity market design to cope with high shares of renewables. We suggest that a new wave of electricity experiments is beginning around the theme of how to incorporate large shares of intermittent renewable generation in to electricity systems.

Geographical Load Balancing with Renewables

Liu, Zhenhua; Lin, Minghong; Wierman, Adam; Low, Steven H.; Andrew, Lachlan L. H.
Fonte: Instituto de Tecnologia da Califórnia Publicador: Instituto de Tecnologia da Califórnia
Tipo: Conference or Workshop Item; PeerReviewed Formato: application/pdf
Publicado em /06/2011
Relevância na Pesquisa
27.38%
Given the significant energy consumption of data centers, improving their energy efficiency is an important social problem. However, energy efficiency is necessary but not sufficient for sustainability, which demands reduced usage of energy from fossil fuels. This paper investigates the feasibility of powering internet-scale systems using (nearly) entirely renewable energy. We perform a trace-based study to evaluate three issues related to achieving this goal: the impact of geographical load balancing, the role of storage, and the optimal mix of renewables. Our results highlight that geographical load balancing can significantly reduce the required capacity of renewable energy by using the energy more efficiently with “follow the renewables” routing. Further, our results show that small-scale storage can be useful, especially in combination with geographical load balancing, and that an optimal mix of renewables includes significantly more wind than photovoltaic solar.

Crise financeira, energia e sustentabilidade no Brasil; Financial crisis, energy and sustainability in Brazil

Lucon, Oswaldo; Goldemberg, José
Fonte: Universidade de São Paulo. Instituto de Estudos Avançados Publicador: Universidade de São Paulo. Instituto de Estudos Avançados
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; ; ; ; ; ; Formato: application/pdf; application/pdf
Publicado em 01/01/2009 POR; ENG
Relevância na Pesquisa
27.21%
A recente crise financeira global traz consigo efeitos como a redução da atividade econômica e, consequentemente, do consumo de energia. Essa pode ser uma importante oportunidade para reorganizar o sistema energético em bases mais sólidas e sustentáveis: a eficiência, a maior participação das fontes renováveis e a descentralização da produção de energia. O Brasil e outros países em desenvolvimento podem aproveitar a experiência dos países desenvolvidos em eficiência energética, complementando com um programa vigoroso em energias renováveis, particularmente as "modernas" (eólica, solar, biomassa e pequenas hidrelétricas). Entretanto, preocupa o cenário inercial nacional, baseado num aumento da participação das fontes fósseis de energia na matriz, na priorização dos recursos à exploração de petróleo e gás natural e na manutenção de padrões insustentáveis de produção e consumo.; The recent global financial crisis brings about effects such as a reduction in the economic activity and consequently in energy consumption. This may be an important opportunity to reorganize the energy system under more solid and sustainable foundations: efficiency, higher share of renewables and decentralized energy production. Brazil and other developing countries can leapfrog the experience acquired by developed nations in energy efficiency...

Evaluating the Effect of Intermittent Renewables on the Wholesale Electricity Market in Germany

Adelfio, Andrew
Fonte: Universidade Duke Publicador: Universidade Duke
Tipo: Masters' project
Publicado em 24/04/2014 EN_US
Relevância na Pesquisa
37.58%
For years, Germany has been a pioneer in the aggressive build out of intermittent renewables (solar and wind). The Energy Concept launched in 2010, in conjunction with previously established federal energy policies, has further enhanced Germany’s ability to reach lofty renewable generation targets via ratepayer surcharges that support feed-in tariffs. However, as the penetration of renewables has increased, wholesale electricity prices have demonstrated a steady decline. Through statistical and market-based analysis, this project 1) quantifies the price decrease that is caused by build out of renewables, 2) examines the market mechanics that result in a price decrease, and 3) evaluates the effect of the price decrease on relevant electricity market participants. Regression analysis indicates that average wholesale electricity prices will experience a decrease of 6.5 €/MWh – 8.5 €/MWh by 2020, solely due to the build out of renewable energy to comply with Energy Concept targets. Based on current electricity demand, this price reduction will result in an annual revenue loss of €2.96 billion – €3.88 billion. Importantly...