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Reduction of CO2 emissions via cross-sector integration of community and industrial energy systemsLi, Ruonan January 2023 (has links)
Integrating energy across different sectors is an efficient solution for improving energy systems to meet energy demands with low CO2 emissions. Such integration includes combining the supply and demand of heating, cooling, and electricity by implementing appropriate equipment, as well as combining the energy systems of civic and industrial sectors. This thesis develops various optimization approaches to identify the optimal design and operation of distributed energy systems and the integration of energy systems across commercial, industrial, and transportation sectors, which minimize CO2 emissions and costs of the systems. Available equipment of the energy systems includes combined cooling, heating, and power system, absorption chiller, solar thermal collector, photovoltaic, boiler, electric chiller, battery, ground source heat pump, and air source heat pump.
This thesis provides the following contributions to this area. (1) Identify optimal structures of distributed energy systems under different electric grid CO2 footprints. The work implements representative periods when formulating the energy system, which reduces computation time. (2) Differentiate heating demands of entities in the integrated system at different temperature levels to ensure feasible heat transfer. It removes the simplified assumptions in existing studies on the integrated energy system that assume all heating demands are at a uniform temperature. (3) Optimize production rates of plants instead of assuming steady industrial production rates. The switchable production rates lead to a further reduction in CO2 emissions of the integrated system. (4) Identify the environmental and economic benefits of the integrated operation under different electric grid CO2 footprints. It presents that integrated operation reduces more CO2 emissions when the electric grid has higher CO2 footprints. (5) Identify the optimal relative sizes of entities in the integrated system that maximize the CO2 emissions reduction benefits brought by the integrated system. (6) Prove the integrated system has lower CO2 emissions than individual energy systems both under deterministic and stochastic scenarios. Overall, the work in this thesis contributes to developing energy systems and integrated energy systems with the lowest possible CO2 emissions under various scenarios. / Thesis / Doctor of Philosophy (PhD) / As the total population continues to increase worldwide, it is necessary to improve community energy systems to reduce CO2 emissions when meeting energy demands. An efficient solution is integrating energy systems across different sectors. This work explores novel structures of energy systems – integrated energy systems that combine the supply and demand of heating, cooling, and electricity in residential, commercial, industrial, and transportation sectors. The optimal energy system configurations, sizes of subsystems, production rates of plants, heat transfer and electricity transfer, as well as capacity and operation of the equipment, have been identified by developing optimization approaches that minimize CO2 emissions and costs of the integrated system. The optimal design and operation are found under both deterministic and stochastic scenarios and different grid electricity generation scenarios, which provide references for developing community energy systems with the lowest possible CO2 emissions under various scenarios.
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Análise regulatória de casos de implementação de usinas hidrelétricas binacionais: levantamento histórico e projeções para o futuro. / Regulatory analysis of cases of bi-nacional hydroelectric plants implementation: historical survey and projections for the future.Novoa Curihuentro, Sebastian Gonzalo 06 August 2015 (has links)
Os projetos hidrelétricos binacionais existentes têm exibido grandes resultados no que se refere à integração energética, principalmente pela forma com que os países membros vêm lidando com os investimentos de geração. Nesse sentido, com base em pesquisas documentais realizadas para a compreensão da evolução da regulação especialmente da integração de energia e potência dos empreendimentos e dos mercados elétricos dos países contratantes , assim como da regulação elétrica dos países envolvidos, o presente trabalho tem por objetivo apresentar alinhamentos regulatórios para o desenvolvimento de futuros projetos hidrelétricos binacionais. Parte das ferramentas apresentadas e dos arranjos previstos nos modelos é preexistente e, inclusive, alguns deles têm sido aplicados na regulação existente de projetos em desenvolvimento. Contudo, será apresentada uma forma articulada de utilização, mediante a criação de modelos que possam servir como alinhamentos gerais para melhor orientar os esforços para a realização de futuros projetos binacionais. Tudo isso sob a ótica da teoria de desenhos de mercado e da teoria do interesse privado, com o intuito de, consequentemente, facilitar a inclusão de empreendedores privados nesse tipo de iniciativa. / The existing binational hydroelectric projects have shown very good results when it comes to energy market integration, especially considering the way that countries deal with generation investments. Therefore, based on documentary research conducted to understand the evolution of the energy markets regulation particularly the way that the involved countries deal with the integration of the energy and power coming of the enterprises to their national energy markets , as well as the electrical regulation of such countries, this document intends to introduce regulatory alignments to guide the development of future binational hydroelectric projects. Some of the regulatory tools and arrangements presented as part of the models are pre-existing to this paper, and even some of them have been used on existing regulation of projects currently under development. However, an articulate way to use them will be presented, by creating models that can serve as general alignments to improve the accuracy of the efforts for the development of new binational hydroelectric projects. All this from the standpoint of the energy market designs theory and private interest theory, in order to facilitate the inclusion of private entrepreneurs in this kind of initiative.
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A integração energética na América do Sul: uma análise da formação de preferências do Brasil por acordos bilaterais / The Energy Integration in South America: an analysis of preference formation in Brazil by bilateral agreementsSilva, Lilian da 16 September 2016 (has links)
Desde o início dos anos 2000, o regionalismo sul-americano vive uma tendência multidimensional, incluindo novas temáticas ao foco das discussões sobre integração, entre elas, a energia. Diante deste cenário, o objetivo central deste trabalho é entender como se dá a formação de preferências do Brasil por um acordo de integração energética. Além dele, foram adotados como objetivos secundários: (i) estudar o histórico da integração energética na América do Sul, especialmente no que tange ao Brasil; (ii) entender o processo de negociação que envolve um acordo, formulando um tipo ideal voltado a integração energética e; (iii) reconhecer os benefícios e as dificuldades que envolvem a opção por um acordo energético de tipo bilateral ou multilateral. A fim de responder a essas perguntas, adotou-se a abordagem de Jogos de Dois Níveis, de Robert Putnam, por sua capacidade em relacionar a dinâmica da política interna com a externa, permitindo a análise do cenário complexo das negociações de um acordo de integração energética. A partir desta pesquisa, viu-se que a morosidade que envolve o processo de integração energética na América do Sul não é resultado apenas da falta de vontade política ou da ausência de um ator que arque com seus custos, mas principalmente da dificuldade em coordenar uma ampla gama de atores, interesses, expectativas e ordenamentos jurídicos, em mais de uma esfera de negociação. Por isso, diante de necessidades pontuais e imediatas, vê-se, por parte do Brasil, a adoção majoritária de acordos bilaterais, sem abandonar, no entanto, paralelamente, as discussões dos foros multilaterais. / Since the early 2000s, the South America regionalism lives a multidimensional trend, including new themes to focus the integration discussions, including energy. In this scenario, the aim of this research is to understand the preferences formation in Brazil for an energy integration agreement. Besides, were adopted as secondary objectives: (i) study the history of energy integration in South America, especially in regard to Brazil; (ii) understand the negotiation process that involves an agreement by formulating an ideal energy integration agreement and; (iii) recognize the benefits and difficulties involving the choice of an energy bilateral or multilateral agreement. In order to answer these questions were adopted the approach of Two-Level Games by Robert Putnam, because of its ability to relate the dynamics of internal politics with the foreign policy, allowing the analysis of the complex scenario of an energy integration agreement negotiations. From this research, it is clear that the length involving the energy integration process in South America is not the result only a political lack or a paymaster absence, but mainly the difficulty in coordinating a wide range of actors, interests, expectations and legal systems, in more than one sphere of negotiation. So, by particular needs, Brazil elects bilateral agreements, without abandoning, however, in parallel, discussions in multilateral forums.
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An analysis of DC distribution systemsAjitkumar, Rohit 05 April 2011 (has links)
The Master's Thesis research focuses on analyzing the possibilities of using Direct Current distribution systems to distribute power to end users. Considering the shift in load types in the past few decades and also a growing demand of distributed generation, DC distribution can potentially offer higher efficiencies and cost savings to utilities. The incorporation of DC distribution offers the opportunity to eliminate multiple conversion stages for devices which are powered using DC electricity. The integration of power sources such as photovoltaics and fuel cells, which produce DC power, offer further incentives to consider the use of DC systems. Using DC systems can help eliminate the conversion losses associated with rectifiers and inverters which would be part of the infrastructure if AC distribution was used. In the literature, the study of DC distribution has been limited to customized systems. The objective of this research is to analyze DC distribution when applied to systems based on standard IEEE test feeder systems. The IEEE 13 node test feeder and the IEEE 37 node test feeder will be used as the basis for the analysis. Issues such as associated costs, protection and integration of appliances will also be addressed.
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O desafio foi lançado: o Brasil em busca da integração energética sul-americana (2000-2010) / The challenge was launched: Brazil in the search of South American energy integration (2000-2010)Helen Miranda Nunes 06 May 2014 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Em anos recentes, a temática energética vem sendo objeto de barganhas políticas e econômicas na América do Sul. O presente trabalho visou a trazer tal temática para as Relações Internacionais, no âmbito da Integração Regional, com ênfase no papel do Brasil em suas relações internacionais com os vizinhos sul-americanos, no recorte temporal 2000-2010. Argumentou-se que o Brasil vem buscando a integração energética relacionada à infraestrutura na América do Sul com vistas à promoção do seu desenvolvimento. O desenvolvimento regional está conectado com o nacional. O Brasil também teve como objetivo garantir a estabilidade regional. Trabalhou-se com o conceito de integração energética definido como a constituição de ativos comuns permanentes entre os países. Ademais, as iniciativas dos processos integracionistas em energia foram analisadas com foco na IIRSA, iniciativa até então inédita. Posteriormente, a IIRSA foi reestruturada e incorporada à UNASUL e um novo e exclusivo Conselho para assuntos energéticos foi criado. A OLADE e o MERCOSUL também entraram no debate, de forma breve, a fim de contextualizar a energia como fator vital para o desenvolvimento regional antes dos anos 2000. Os setores potenciais para a integração energética sul-americana foram os de gás natural e hidroeletricidade com base na definição proposta na presente pesquisa. / In recent years, energy has been the object of economic and political bargains in South America. This thesis has brought the topic of energy to the field of International Relations, within the scope of Regional Integration, with a focus on Brazils role in South America from 2000 until 2010. Brazil has been seeking to integrate the energy infrastructure of South America with the aim of achieving its own development. Regional development is directly connected to national progress. Brazil has been trying to achieve regional stability. The concept of energy integration is defined as the constitution of common and permanent assets among countries that result in infrastructure. Moreover, initiatives of regional integration processes in energy are also analyzed, with IIRSA as the starting point. Subsequently, IIRSA was incorporated into UNASUR, thus creating a new and exclusive Council for energy issues. Energy projects in OLADE and MERCOSUR are also discussed. Natural gas and hydroelectricity are defined as the potential energy sectors for South American regional integration, on the basis of the concept of energy integration chosen for this research.
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Étude et conception d'une pompe à chaleur intégrée dans le procédé d'épuration du biogaz / Study and design of a heat pump integrated in a biogas upgrading processKeryakos, Elie 05 May 2017 (has links)
L’engagement de l’Europe sur les énergies renouvelables amène à l’accélération du développement du biométhane comme énergie renouvelable. Les travaux de cette thèse portent sur une partie du procédé Cryo Pur qui est un procédé essentiellement frigorifique qui va permettre en refroidissant le biogaz de la température ambiante à -120 °C, de séparer successivement l’eau, le CO2 et des polluants pour obtenir du méthane et du CO2 liquides de hautes puretés. Les objectifs poursuivis sont méthodologiques et expérimentaux. La méthode est celle de l’intégration énergétique associée à une analyse exergétique du procédé. L’analyse intègre la production frigorifique et la production de chaleur par les groupes frigorifiques pour son utilisation dans le procédé de méthanisation. L’optimisation énergétique part de l’analyse exergétique et identifie les pertes des différentes étapes du procédé et intègre à la fois les productions frigorifiques aux différents niveaux de température et la production de chaleur utilisée dans le digesteur. Le besoin en chaleur du digesteur se situe autour de 50 à 55 °C pour les bactéries thermophiles. Pour l’épuration du biogaz et la liquéfaction du biométhane, les besoins frigorifiques se situent de la température ambiante jusqu’à-120 °C. Dans le procédé Cryo Pur, la production frigorifique s’effectue à 4 niveaux de températures : 2°C, -40 °C, -78 °C et -120 °C. La pompe à chaleur est couplée aux différents systèmes frigorifiques en refroidissant un frigoporteur à une température qui fait l’objet de l’optimisation globale du système de thermo-frigo-pompe. En effet la pompe à chaleur refroidit les condenseurs des 4 systèmes frigorifiques et la chaleur récupérée des groupes froids est valorisée à 55 °C par la pompe à chaleur.Complémentairement à cette optimisation énergétique globale, la thèse se focalise sur le givrage et dégivrage de l’eau contenue dans le biogaz. Cette opération consomme beaucoup d’énergie et un travail d’optimisation énergétique est mené pour minimiser la consommation d’énergie pour la déshumidification du biogaz de la température ambiante à -78 °C. La représentation des cycles associés au givrage et dégivrage de la glace hydrique et des pertes associées aux montées et descentes en température des masses métalliques des échangeurs requière une modélisation dynamique de ces phénomènes. Du point de vue expérimental les cycles de givrage et dégivrage de l’eau font l’objet d’une optimisation quant à leur gestion.Les travaux de la modélisation donneront lieu à dimensionner les échangeurs des cycles de givrage et de dégivrage. Le but finalement étant l’obtention d’un rendement exergétique le plus élevé possible. Les essais ont permis de valider les modèles d’échangeurs et des systèmes frigorifiques. L’optimisation intègre également le choix des mélanges des fluides frigorigènes. / Europe's commitment to renewable energy leads to accelerate the biomethane development as a renewable energy. The work of this thesis is based on the Cryo Pur process which is essentially a cooling process that will allow the biogas cooling from ambient temperature to -120 °C. While cooling the biogas, water vapor, CO2 and pollutants must be separated to obtain liquefied biomethane and bio CO2. The objectives pursued are methodological and experimental. The method used is the energy integration associated with an exergy analysis of the process. The analysis integrates the cooling production and the heat production by the refrigeration units for the use in the methanisation process. The energy optimization starts from the exergy analysis and identifies the losses of the various stages of the process and integrates both the cooling production at different temperature levels and the heat production used in the digester. The heat requirement of the digester is around 50 to 55 °C for the thermophilic bacteria. For the biogas upgrading and the liquefaction of biomethane, the cooling requirements are from ambient temperature to -120 °C. In the Cryo Pur process, refrigeration is carried out at 4 different temperature levels: 2 °C, -40 °C, -78 °C and -120 °C. The heat pump is coupled to the various refrigeration systems by cooling a refrigerant at a temperature which is the objective of the overall optimization of the heat pump system. The heat pump cools the condensers of the 4 refrigeration systems and the heat recovered from the refrigeration systems is upgraded to 55 °C by the heat pump.In addition to this overall energy optimization, the thesis focuses on the frosting and defrosting of the water contained in the biogas. This operation consumes a lot of energy. An energy optimization work is carried out to minimize the energy consumption for the dehumidification of biogas from ambient temperature to -78 ° C. The representation of the frosting and defrosting cycles and the losses associated with the temperature of the metallic mass of the heat exchangers requires a dynamic modeling. The dynamic modeling will lead to design the heat exchangers. The ultimate aim is to achieve the highest possible exergy efficiency. Tests made it possible to validate the models of the heat exchangers and refrigeration systems. The optimization also integrates the choice of refrigerant mixtures.
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O desafio foi lançado: o Brasil em busca da integração energética sul-americana (2000-2010) / The challenge was launched: Brazil in the search of South American energy integration (2000-2010)Helen Miranda Nunes 06 May 2014 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Em anos recentes, a temática energética vem sendo objeto de barganhas políticas e econômicas na América do Sul. O presente trabalho visou a trazer tal temática para as Relações Internacionais, no âmbito da Integração Regional, com ênfase no papel do Brasil em suas relações internacionais com os vizinhos sul-americanos, no recorte temporal 2000-2010. Argumentou-se que o Brasil vem buscando a integração energética relacionada à infraestrutura na América do Sul com vistas à promoção do seu desenvolvimento. O desenvolvimento regional está conectado com o nacional. O Brasil também teve como objetivo garantir a estabilidade regional. Trabalhou-se com o conceito de integração energética definido como a constituição de ativos comuns permanentes entre os países. Ademais, as iniciativas dos processos integracionistas em energia foram analisadas com foco na IIRSA, iniciativa até então inédita. Posteriormente, a IIRSA foi reestruturada e incorporada à UNASUL e um novo e exclusivo Conselho para assuntos energéticos foi criado. A OLADE e o MERCOSUL também entraram no debate, de forma breve, a fim de contextualizar a energia como fator vital para o desenvolvimento regional antes dos anos 2000. Os setores potenciais para a integração energética sul-americana foram os de gás natural e hidroeletricidade com base na definição proposta na presente pesquisa. / In recent years, energy has been the object of economic and political bargains in South America. This thesis has brought the topic of energy to the field of International Relations, within the scope of Regional Integration, with a focus on Brazils role in South America from 2000 until 2010. Brazil has been seeking to integrate the energy infrastructure of South America with the aim of achieving its own development. Regional development is directly connected to national progress. Brazil has been trying to achieve regional stability. The concept of energy integration is defined as the constitution of common and permanent assets among countries that result in infrastructure. Moreover, initiatives of regional integration processes in energy are also analyzed, with IIRSA as the starting point. Subsequently, IIRSA was incorporated into UNASUR, thus creating a new and exclusive Council for energy issues. Energy projects in OLADE and MERCOSUR are also discussed. Natural gas and hydroelectricity are defined as the potential energy sectors for South American regional integration, on the basis of the concept of energy integration chosen for this research.
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Stochastic Optimization and Real-Time Scheduling in Cyber-Physical SystemsJanuary 2012 (has links)
abstract: A principal goal of this dissertation is to study stochastic optimization and real-time scheduling in cyber-physical systems (CPSs) ranging from real-time wireless systems to energy systems to distributed control systems. Under this common theme, this dissertation can be broadly organized into three parts based on the system environments. The first part investigates stochastic optimization in real-time wireless systems, with the focus on the deadline-aware scheduling for real-time traffic. The optimal solution to such scheduling problems requires to explicitly taking into account the coupling in the deadline-aware transmissions and stochastic characteristics of the traffic, which involves a dynamic program that is traditionally known to be intractable or computationally expensive to implement. First, real-time scheduling with adaptive network coding over memoryless channels is studied, and a polynomial-time complexity algorithm is developed to characterize the optimal real-time scheduling. Then, real-time scheduling over Markovian channels is investigated, where channel conditions are time-varying and online channel learning is necessary, and the optimal scheduling policies in different traffic regimes are studied. The second part focuses on the stochastic optimization and real-time scheduling involved in energy systems. First, risk-aware scheduling and dispatch for plug-in electric vehicles (EVs) are studied, aiming to jointly optimize the EV charging cost and the risk of the load mismatch between the forecasted and the actual EV loads, due to the random driving activities of EVs. Then, the integration of wind generation at high penetration levels into bulk power grids is considered. Joint optimization of economic dispatch and interruptible load management is investigated using short-term wind farm generation forecast. The third part studies stochastic optimization in distributed control systems under different network environments. First, distributed spectrum access in cognitive radio networks is investigated by using pricing approach, where primary users (PUs) sell the temporarily unused spectrum and secondary users compete via random access for such spectrum opportunities. The optimal pricing strategy for PUs and the corresponding distributed implementation of spectrum access control are developed to maximize the PU's revenue. Then, a systematic study of the nonconvex utility-based power control problem is presented under the physical interference model in ad-hoc networks. Distributed power control schemes are devised to maximize the system utility, by leveraging the extended duality theory and simulated annealing. / Dissertation/Thesis / Ph.D. Electrical Engineering 2012
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A integração energética na América do Sul: uma análise da formação de preferências do Brasil por acordos bilaterais / The Energy Integration in South America: an analysis of preference formation in Brazil by bilateral agreementsLilian da Silva 16 September 2016 (has links)
Desde o início dos anos 2000, o regionalismo sul-americano vive uma tendência multidimensional, incluindo novas temáticas ao foco das discussões sobre integração, entre elas, a energia. Diante deste cenário, o objetivo central deste trabalho é entender como se dá a formação de preferências do Brasil por um acordo de integração energética. Além dele, foram adotados como objetivos secundários: (i) estudar o histórico da integração energética na América do Sul, especialmente no que tange ao Brasil; (ii) entender o processo de negociação que envolve um acordo, formulando um tipo ideal voltado a integração energética e; (iii) reconhecer os benefícios e as dificuldades que envolvem a opção por um acordo energético de tipo bilateral ou multilateral. A fim de responder a essas perguntas, adotou-se a abordagem de Jogos de Dois Níveis, de Robert Putnam, por sua capacidade em relacionar a dinâmica da política interna com a externa, permitindo a análise do cenário complexo das negociações de um acordo de integração energética. A partir desta pesquisa, viu-se que a morosidade que envolve o processo de integração energética na América do Sul não é resultado apenas da falta de vontade política ou da ausência de um ator que arque com seus custos, mas principalmente da dificuldade em coordenar uma ampla gama de atores, interesses, expectativas e ordenamentos jurídicos, em mais de uma esfera de negociação. Por isso, diante de necessidades pontuais e imediatas, vê-se, por parte do Brasil, a adoção majoritária de acordos bilaterais, sem abandonar, no entanto, paralelamente, as discussões dos foros multilaterais. / Since the early 2000s, the South America regionalism lives a multidimensional trend, including new themes to focus the integration discussions, including energy. In this scenario, the aim of this research is to understand the preferences formation in Brazil for an energy integration agreement. Besides, were adopted as secondary objectives: (i) study the history of energy integration in South America, especially in regard to Brazil; (ii) understand the negotiation process that involves an agreement by formulating an ideal energy integration agreement and; (iii) recognize the benefits and difficulties involving the choice of an energy bilateral or multilateral agreement. In order to answer these questions were adopted the approach of Two-Level Games by Robert Putnam, because of its ability to relate the dynamics of internal politics with the foreign policy, allowing the analysis of the complex scenario of an energy integration agreement negotiations. From this research, it is clear that the length involving the energy integration process in South America is not the result only a political lack or a paymaster absence, but mainly the difficulty in coordinating a wide range of actors, interests, expectations and legal systems, in more than one sphere of negotiation. So, by particular needs, Brazil elects bilateral agreements, without abandoning, however, in parallel, discussions in multilateral forums.
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Análise regulatória de casos de implementação de usinas hidrelétricas binacionais: levantamento histórico e projeções para o futuro. / Regulatory analysis of cases of bi-nacional hydroelectric plants implementation: historical survey and projections for the future.Sebastian Gonzalo Novoa Curihuentro 06 August 2015 (has links)
Os projetos hidrelétricos binacionais existentes têm exibido grandes resultados no que se refere à integração energética, principalmente pela forma com que os países membros vêm lidando com os investimentos de geração. Nesse sentido, com base em pesquisas documentais realizadas para a compreensão da evolução da regulação especialmente da integração de energia e potência dos empreendimentos e dos mercados elétricos dos países contratantes , assim como da regulação elétrica dos países envolvidos, o presente trabalho tem por objetivo apresentar alinhamentos regulatórios para o desenvolvimento de futuros projetos hidrelétricos binacionais. Parte das ferramentas apresentadas e dos arranjos previstos nos modelos é preexistente e, inclusive, alguns deles têm sido aplicados na regulação existente de projetos em desenvolvimento. Contudo, será apresentada uma forma articulada de utilização, mediante a criação de modelos que possam servir como alinhamentos gerais para melhor orientar os esforços para a realização de futuros projetos binacionais. Tudo isso sob a ótica da teoria de desenhos de mercado e da teoria do interesse privado, com o intuito de, consequentemente, facilitar a inclusão de empreendedores privados nesse tipo de iniciativa. / The existing binational hydroelectric projects have shown very good results when it comes to energy market integration, especially considering the way that countries deal with generation investments. Therefore, based on documentary research conducted to understand the evolution of the energy markets regulation particularly the way that the involved countries deal with the integration of the energy and power coming of the enterprises to their national energy markets , as well as the electrical regulation of such countries, this document intends to introduce regulatory alignments to guide the development of future binational hydroelectric projects. Some of the regulatory tools and arrangements presented as part of the models are pre-existing to this paper, and even some of them have been used on existing regulation of projects currently under development. However, an articulate way to use them will be presented, by creating models that can serve as general alignments to improve the accuracy of the efforts for the development of new binational hydroelectric projects. All this from the standpoint of the energy market designs theory and private interest theory, in order to facilitate the inclusion of private entrepreneurs in this kind of initiative.
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